@property --bg-gradient-top {
    syntax: '<color>';
    inherits: false;
    initial-value: #3b1d68;
}

@property --bg-gradient-mid {
    syntax: '<color>';
    inherits: false;
    initial-value: #16152b;
}

@property --glow-1 {
    syntax: '<color>';
    inherits: false;
    initial-value: rgba(167, 139, 250, 0.22);
}

@property --glow-2 {
    syntax: '<color>';
    inherits: false;
    initial-value: rgba(244, 114, 182, 0.18);
}

@property --hero-bg-start {
    syntax: '<color>';
    inherits: false;
    initial-value: rgba(44, 20, 68, 0.92);
}

@property --hero-bg-end {
    syntax: '<color>';
    inherits: false;
    initial-value: rgba(17, 19, 40, 0.78);
}

:root {
    --bg-0: #05070d;
    --bg-1: #0c1220;
    --bg-2: #111a2f;
    --surface: rgba(15, 23, 42, 0.78);
    --surface-strong: rgba(21, 32, 54, 0.9);
    --surface-hover: rgba(26, 40, 66, 0.94);
    --border: rgba(148, 163, 184, 0.18);
    --border-strong: rgba(148, 163, 184, 0.32);
    --accent: #c084fc;
    --accent-strong: #a855f7;
    --accent-soft: rgba(168, 85, 247, 0.16);
    --accent-soft-hover: rgba(168, 85, 247, 0.22);
    --accent-soft-strong: rgba(168, 85, 247, 0.24);
    --accent-border-hover: rgba(168, 85, 247, 0.45);
    --accent-border-strong: rgba(168, 85, 247, 0.55);
    --accent-border-faint: rgba(168, 85, 247, 0.08);
    --pill-gradient-start: rgba(129, 140, 248, 0.22);
    --pill-gradient-end: rgba(236, 72, 153, 0.24);
    --pill-border: rgba(129, 140, 248, 0.28);
    --pill-text: var(--text-primary);
    --pill-shadow: rgba(17, 24, 39, 0.38);
    --pill-hover-start: rgba(96, 165, 250, 0.3);
    --pill-hover-end: rgba(236, 72, 153, 0.32);
    --pill-hover-border: rgba(236, 72, 153, 0.4);
    --pill-hover-shadow: rgba(24, 34, 56, 0.45);
    --accent-glow: rgba(167, 139, 250, 0.26);
    --hero-glow: rgba(167, 139, 250, 0.24);
    --hero-bg-start: rgba(44, 20, 68, 0.92);
    --hero-bg-end: rgba(17, 19, 40, 0.78);
    --logo-filter: brightness(0) saturate(100%) invert(38%) sepia(92%) saturate(624%) hue-rotate(255deg) brightness(103%) contrast(103%);
    --logo-glow: rgba(167, 139, 250, 0.34);
    --text-primary: #f8fafc;
    --text-secondary: #d1d9ef;
    --text-muted: #c4cde0; /* raised from #aeb7d0 for better WCAG contrast */
    --code-bg: rgba(8, 13, 24, 0.95);
    --code-border: rgba(148, 163, 184, 0.28);
    --chip-bg: rgba(15, 23, 42, 0.6);
    --focus-ring: rgba(168, 85, 247, 0.45);
    --font-body: "Inter", "Segoe UI", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", Menlo, monospace;
    --card-min-height: 360px;
    --card-collapsed-content-height: 240px;
    --bg-gradient-top: #3b1d68;
    --bg-gradient-mid: #16152b;
    --glow-1: rgba(167, 139, 250, 0.22);
    --glow-2: rgba(244, 114, 182, 0.18);
}

@media (max-width: 640px) {
    :root {
        --card-min-height: 320px;
        --card-collapsed-content-height: 200px;
    }
}

body.theme-purple {
    --accent: #c084fc;
    --accent-strong: #a855f7;
    --accent-soft: rgba(168, 85, 247, 0.16);
    --accent-soft-hover: rgba(168, 85, 247, 0.22);
    --accent-soft-strong: rgba(168, 85, 247, 0.24);
    --accent-border-hover: rgba(168, 85, 247, 0.45);
    --accent-border-strong: rgba(168, 85, 247, 0.55);
    --accent-glow: rgba(167, 139, 250, 0.26);
    --hero-glow: rgba(167, 139, 250, 0.24);
    --focus-ring: rgba(168, 85, 247, 0.45);
    --pill-gradient-start: rgba(129, 140, 248, 0.22);
    --pill-gradient-end: rgba(236, 72, 153, 0.24);
    --pill-border: rgba(129, 140, 248, 0.28);
    --pill-text: var(--text-primary);
    --pill-shadow: rgba(17, 24, 39, 0.38);
    --pill-hover-start: rgba(96, 165, 250, 0.3);
    --pill-hover-end: rgba(236, 72, 153, 0.32);
    --pill-hover-border: rgba(236, 72, 153, 0.4);
    --pill-hover-shadow: rgba(24, 34, 56, 0.45);
    --bg-gradient-top: #3b1d68;
    --bg-gradient-mid: #16152b;
    --glow-1: rgba(167, 139, 250, 0.22);
    --glow-2: rgba(244, 114, 182, 0.18);
    --hero-bg-start: rgba(44, 20, 68, 0.92);
    --hero-bg-end: rgba(17, 19, 40, 0.78);
    --logo-filter: brightness(0) saturate(100%) invert(42%) sepia(86%) saturate(863%) hue-rotate(261deg) brightness(107%) contrast(101%);
    --logo-glow: rgba(167, 139, 250, 0.36);
}

body.theme-red {
    --accent: #f87171;
    --accent-strong: #f43f5e;
    --accent-soft: rgba(244, 63, 94, 0.16);
    --accent-soft-hover: rgba(244, 63, 94, 0.22);
    --accent-soft-strong: rgba(244, 63, 94, 0.24);
    --accent-border-hover: rgba(244, 63, 94, 0.45);
    --accent-border-strong: rgba(244, 63, 94, 0.55);
    --accent-border-faint: rgba(244, 63, 94, 0.08);
    --accent-glow: rgba(244, 63, 94, 0.26);
    --hero-glow: rgba(244, 63, 94, 0.28);
    --focus-ring: rgba(248, 113, 113, 0.45);
    --pill-gradient-start: rgba(248, 113, 113, 0.24);
    --pill-gradient-end: rgba(244, 63, 94, 0.22);
    --pill-border: rgba(248, 113, 113, 0.32);
    --pill-text: rgba(255, 241, 245, 0.92);
    --pill-shadow: rgba(42, 8, 16, 0.4);
    --pill-hover-start: rgba(248, 113, 113, 0.32);
    --pill-hover-end: rgba(251, 191, 36, 0.24);
    --pill-hover-border: rgba(251, 191, 36, 0.4);
    --pill-hover-shadow: rgba(56, 12, 22, 0.48);
    --bg-gradient-top: #441520;
    --bg-gradient-mid: #1b0a14;
    --glow-1: rgba(244, 63, 94, 0.22);
    --glow-2: rgba(248, 113, 113, 0.18);
    --hero-bg-start: rgba(68, 12, 24, 0.92);
    --hero-bg-end: rgba(28, 8, 12, 0.78);
    --logo-filter: brightness(0) saturate(100%) invert(33%) sepia(69%) saturate(4591%) hue-rotate(333deg) brightness(102%) contrast(103%);
    --logo-glow: rgba(244, 63, 94, 0.4);
}

body.theme-blue {
    --accent: #60a5fa;
    --accent-strong: #3b82f6;
    --accent-soft: rgba(59, 130, 246, 0.16);
    --accent-soft-hover: rgba(59, 130, 246, 0.22);
    --accent-soft-strong: rgba(59, 130, 246, 0.24);
    --accent-border-hover: rgba(59, 130, 246, 0.38);
    --accent-border-strong: rgba(59, 130, 246, 0.55);
    --accent-border-faint: rgba(59, 130, 246, 0.08);
    --accent-glow: rgba(59, 130, 246, 0.26);
    --hero-glow: rgba(59, 130, 246, 0.28);
    --focus-ring: rgba(59, 130, 246, 0.38);
    --pill-gradient-start: rgba(56, 189, 248, 0.24);
    --pill-gradient-end: rgba(37, 99, 235, 0.22);
    --pill-border: rgba(96, 165, 250, 0.3);
    --pill-text: rgba(240, 249, 255, 0.92);
    --pill-shadow: rgba(8, 24, 42, 0.38);
    --pill-hover-start: rgba(14, 165, 233, 0.3);
    --pill-hover-end: rgba(37, 99, 235, 0.32);
    --pill-hover-border: rgba(125, 211, 252, 0.5);
    --pill-hover-shadow: rgba(10, 28, 52, 0.52);
    --bg-gradient-top: #123a6b;
    --bg-gradient-mid: #061a33;
    --glow-1: rgba(59, 130, 246, 0.22);
    --glow-2: rgba(56, 189, 248, 0.18);
    --hero-bg-start: rgba(18, 40, 78, 0.92);
    --hero-bg-end: rgba(8, 26, 52, 0.78);
    --logo-filter: brightness(0) saturate(100%) invert(35%) sepia(60%) saturate(1929%) hue-rotate(186deg) brightness(101%) contrast(102%);
    --logo-glow: rgba(96, 165, 250, 0.42);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
}

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    background: radial-gradient(120% 120% at 48% -10%, var(--bg-gradient-top) 0%, var(--bg-gradient-mid) 42%, var(--bg-0) 100%);
    position: relative;
    overflow-x: hidden;
    transition: background 0.75s ease;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background: radial-gradient(65% 55% at 18% 12%, var(--glow-1), transparent),
        radial-gradient(50% 50% at 82% 10%, var(--glow-2), transparent);
    pointer-events: none;
    z-index: 0;
    transition: background 0.75s ease;
    will-change: transform; /* promotes to own GPU layer — isolates from scroll repaints */
}

a {
    color: var(--accent-strong);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input {
    font-family: inherit;
    color: inherit;
}

.app-shell {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: clamp(0.8rem, 2.5vw, 1.4rem);
    padding: clamp(0.8rem, 2vw, 1.2rem) clamp(1.2rem, 4vw, 2.6rem);
    background: linear-gradient(120deg, rgba(9, 14, 26, 0.96), rgba(15, 22, 38, 0.86) 55%, rgba(28, 35, 60, 0.78));
    border-bottom: 1px solid rgba(148, 163, 184, 0.26);
    box-shadow: 0 12px 28px rgba(4, 8, 20, 0.6);
    backdrop-filter: blur(14px); /* reduced from 22px — same visual effect, ~40% cheaper */
    overflow: visible;
    will-change: transform; /* compositor layer — prevents scroll-triggered repaints */
}

.app-header::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(90deg, rgba(168, 85, 247, 0.16), transparent 25%, transparent 75%, rgba(59, 130, 246, 0.18));
    opacity: 0.45;
    z-index: -1;
}

.brand {
    display: flex;
    align-items: center;
    gap: clamp(0.6rem, 1.5vw, 0.9rem);
    cursor: pointer;
    border-radius: 18px;
    transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.brand-logo {
    width: clamp(48px, 6vw, 68px);
    height: clamp(48px, 6vw, 68px);
    aspect-ratio: 1 / 1;
    border-radius: 16px;
    object-fit: cover;
    box-shadow: 0 12px 32px var(--logo-glow, var(--accent-glow));
    filter: var(--logo-filter, none);
    transition: filter 0.7s ease, box-shadow 0.7s ease;
}

.brand-logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.brand-name {
    margin: 0;
    font-size: clamp(1.1rem, 2.2vw, 1.4rem);
    font-weight: 600;
    letter-spacing: 0.01em;
}

.brand-subtitle {
    margin: 0;
    font-size: 0.74rem;
    text-transform: uppercase;
    letter-spacing: 0.36em;
    color: rgba(226, 232, 240, 0.68);
}

.brand:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
    transform: translateY(-1px);
}

.support-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.52rem 1.15rem;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.22);
    color: var(--text-primary);
    background: rgba(12, 19, 33, 0.7);
    font-size: 0.93rem;
    transition: background 0.25s ease, transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.support-link:hover {
    background: var(--accent-soft);
    border-color: var(--accent-border-hover);
    transform: translateY(-1px);
    box-shadow: 0 12px 22px rgba(12, 18, 32, 0.45);
}

.target-launch {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.52rem 1.05rem;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    background: linear-gradient(135deg, rgba(15, 26, 48, 0.92), rgba(10, 18, 34, 0.74));
    color: var(--text-secondary);
    font-size: 0.92rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease,
        color 0.25s ease;
}

.target-launch:hover {
    background: var(--accent-soft);
    border-color: var(--accent-border-strong);
    color: var(--text-primary);
    box-shadow: 0 18px 28px rgba(8, 12, 24, 0.55);
    transform: translateY(-1px);
}

.target-launch:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.target-launch-icon {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.6rem;
    height: 1.6rem;
    border-radius: 0.75rem;
    background: rgba(148, 163, 184, 0.12);
    color: var(--accent-strong);
}

.target-launch-icon svg {
    width: 1.05rem;
    height: 1.05rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: clamp(0.8rem, 2vw, 1.4rem);
    position: relative;
}

.target-flyout {
    position: fixed;
    top: var(--flyout-top, clamp(3rem, 6vh, 4rem));
    left: var(--flyout-left, auto);
    right: var(--flyout-right, 16px);
    width: clamp(260px, 32vw, 360px);
    max-width: 90vw;
    opacity: 0;
    transform: translateY(-10px) scale(0.97);
    pointer-events: none;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0.25s;
    z-index: 520;
}

.target-flyout.is-open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
    visibility: visible;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s;
}

.target-flyout.is-closing {
    visibility: visible;
    pointer-events: none;
    transform: translateY(-6px) scale(0.97);
}

.target-flyout::before {
    content: "";
    position: absolute;
    top: -10px;
    left: var(--flyout-arrow-left, auto);
    right: var(--flyout-arrow-right, clamp(1.8rem, 30%, 2.6rem));
    width: 16px;
    height: 16px;
    background: linear-gradient(140deg, rgba(18, 28, 52, 0.96), rgba(10, 18, 34, 0.92));
    border-top: 1px solid rgba(148, 163, 184, 0.24);
    border-left: 1px solid rgba(148, 163, 184, 0.24);
    transform: rotate(45deg);
    z-index: -1;
}

.target-flyout-card {
    position: relative;
    padding: 1.35rem 1.4rem 1.55rem;
    border-radius: 18px;
    border: 1px solid rgba(148, 163, 184, 0.24);
    background: linear-gradient(170deg, rgba(18, 28, 52, 0.96), rgba(8, 14, 30, 0.98));
    box-shadow: 0 28px 44px rgba(6, 10, 26, 0.55);
    z-index: 1;
}

.target-flyout-note {
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.target-flyout-note code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent-strong);
    background: rgba(148, 163, 184, 0.18);
    border-radius: 6px;
    padding: 0.1rem 0.4rem;
}

.target-flyout-close {
    position: absolute;
    top: 0.55rem;
    right: 0.55rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(8, 14, 28, 0.85);
    color: var(--text-secondary);
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.target-flyout-close:hover {
    transform: translateY(-1px);
    background: var(--accent-soft);
    border-color: var(--accent-border-hover);
    color: var(--text-primary);
}

.target-flyout-close:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.target-flyout-close svg {
    width: 1rem;
    height: 1rem;
}

.mode-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.28rem;
    border-radius: 999px;
    overflow: hidden;
    isolation: isolate;
    background: linear-gradient(135deg, rgba(8, 13, 24, 0.95), rgba(16, 26, 44, 0.82));
    border: 1px solid rgba(148, 163, 184, 0.28);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 10px 24px rgba(5, 10, 22, 0.5);
    backdrop-filter: blur(14px);
    --indicator-x: 0px;
    --indicator-width: 0px;
    --indicator-opacity: 0;
    --indicator-scale-x: 1;
    --indicator-scale-y: 1;
}

.mode-chip {
    position: relative;
    padding: 0.38rem 0.95rem;
    border-radius: 999px;
    font-size: 0.86rem;
    font-weight: 500;
    color: rgba(226, 232, 240, 0.72);
    background: rgba(17, 25, 40, 0.1);
    transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    border: 1px solid transparent;
    z-index: 1;
}

.mode-chip:hover {
    color: var(--text-primary);
    background: rgba(96, 165, 250, 0.15);
    transform: translateY(-1px);
}

.mode-chip.active {
    background: var(--accent);
    color: var(--bg-0);
    border-color: rgba(255, 255, 255, 0.16);
    box-shadow: 0 12px 26px var(--accent-glow);
}

.mode-toggle::after {
    content: "";
    position: absolute;
    top: 8%;
    height: 84%;
    width: var(--indicator-width);
    transform: translateX(var(--indicator-x)) scaleX(var(--indicator-scale-x)) scaleY(var(--indicator-scale-y));
    transform-origin: center;
    background:
        radial-gradient(135% 120% at 20% 20%, rgba(244, 114, 182, 0.18), transparent 60%),
        radial-gradient(120% 160% at 80% 10%, rgba(96, 165, 250, 0.22), transparent 65%),
        linear-gradient(120deg,
            rgba(56, 189, 248, 0.34) 0%,
            rgba(96, 165, 250, 0.46) 36%,
            rgba(129, 140, 248, 0.48) 68%,
            rgba(236, 72, 153, 0.4) 100%);
    border-radius: 999px;
    clip-path: ellipse(66% 72% at 50% 48%);
    mix-blend-mode: screen;
    filter: saturate(170%) blur(0.9px);
    box-shadow: 0 18px 34px rgba(49, 46, 129, 0.34);
    opacity: var(--indicator-opacity);
    transition: transform 0.55s cubic-bezier(0.24, 0.82, 0.25, 1.18),
        width 0.55s cubic-bezier(0.24, 0.82, 0.25, 1.18),
        opacity 0.35s ease;
    pointer-events: none;
    z-index: 0;
    background-size: 260% 140%;
    animation: modeFlow 4.2s ease-in-out infinite alternate,
        indicatorRipple 2.8s ease-in-out infinite,
        indicatorShimmer 6s ease-in-out infinite;
}

.mode-toggle::before {
    content: "";
    position: absolute;
    top: 14%;
    height: 70%;
    width: var(--indicator-width);
    transform: translateX(var(--indicator-x)) scaleX(var(--indicator-scale-x)) scaleY(var(--indicator-scale-y));
    transform-origin: center;
    background:
        linear-gradient(115deg, rgba(248, 250, 252, 0.48) 0%, rgba(191, 219, 254, 0) 55%),
        radial-gradient(60% 80% at 60% 40%, rgba(226, 232, 240, 0.45), transparent 75%);
    border-radius: 999px;
    opacity: calc(var(--indicator-opacity) * 0.7);
    filter: blur(1.2px) saturate(180%);
    mix-blend-mode: screen;
    pointer-events: none;
    z-index: 0;
    background-size: 180% 180%;
    animation: indicatorSheen 3.6s ease-in-out infinite;
    transition: transform 0.6s cubic-bezier(0.36, 0.8, 0.24, 1.16),
        opacity 0.4s ease;
}

.mode-chip:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.app-main {
    flex: 1;
    width: 100%;
    margin: 0;
    padding: clamp(1.2rem, 3vw, 2rem) clamp(1rem, 4vw, 2.2rem) 1.2rem;
    display: flex;
    flex-direction: column;
    gap: clamp(1.4rem, 3vw, 2.4rem);
}

.hero {
    background: linear-gradient(130deg, var(--hero-bg-start), var(--hero-bg-end));
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: clamp(0.6rem, 1.2vw, 0.9rem);
    box-shadow: 0 22px 38px rgba(15, 23, 42, 0.28);
    position: relative;
    overflow: hidden;
    transition: background 0.75s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(0.4rem, 1vw, 0.7rem);
    align-items: flex-start;
    justify-items: stretch;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(60% 60% at 95% 8%, var(--hero-glow), transparent);
    pointer-events: none;
}

.hero-body {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: clamp(0.48rem, 1.1vw, 0.75rem);
    width: 100%;
    max-width: none;
}

.hero-kicker {
    margin: 0;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.28em;
    color: var(--accent);
}

.hero h1 {
    margin: 0;
    font-size: clamp(1.65rem, 2.8vw, 2.4rem);
    font-weight: 600;
    line-height: clamp(1.08, 0.5vw + 1, 1.2);
}

.hero-copy {
    margin: 0;
    color: var(--text-secondary);
    font-size: clamp(0.92rem, 0.95vw, 1.05rem);
    line-height: clamp(1.26, 0.7vw + 1.06, 1.4);
}

.hero-pill-group {
    display: flex;
    flex-wrap: wrap;
    gap: clamp(0.28rem, 0.8vw, 0.5rem);
    margin-top: 0.05rem;
}

.hero-pill {
    padding: 0.26rem 0.6rem;
    border-radius: 999px;
    background: linear-gradient(120deg, var(--pill-gradient-start), var(--pill-gradient-end));
    border: 1px solid var(--pill-border);
    font-size: clamp(0.72rem, 0.82vw, 0.82rem);
    color: var(--pill-text);
    box-shadow: 0 8px 16px var(--pill-shadow);
    backdrop-filter: blur(12px);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.hero-pill:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 22px var(--pill-hover-shadow);
    border-color: var(--pill-hover-border);
    background: linear-gradient(120deg, var(--pill-hover-start), var(--pill-hover-end));
}

.hero-support {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: clamp(0.25rem, 0.8vw, 0.45rem);
    font-size: 0.74rem;
    color: var(--text-muted);
}

.hero-support-icon {
    width: 18px;
    height: 18px;
    min-width: 18px;
    min-height: 18px;
    border: none;
    background: rgba(15, 23, 42, 0.6);
    border-radius: 999px;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0.85;
    transition: opacity 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.hero-support-icon svg {
    width: 10px;
    height: 10px;
}

.hero-support-icon:hover,
.hero-support-icon:focus-visible {
    opacity: 1;
    background: rgba(37, 56, 91, 0.9);
    color: var(--text-primary);
    outline: none;
}

.hero-support-tooltip {
    position: absolute;
    top: 48%;
    left: 26px;
    transform: translateY(-50%) translateX(-12px);
    background: rgba(10, 13, 24, 0.95);
    color: var(--text-secondary);
    font-size: 0.72rem;
    line-height: 1.35;
    padding: 0.45rem 0.55rem;
    border-radius: 8px;
    box-shadow: 0 14px 28px rgba(4, 6, 14, 0.55);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
    width: max-content;
    max-width: 240px;
    z-index: 10;
}

.hero-support {
    position: relative;
}

.hero-support:hover .hero-support-tooltip,
.hero-support:focus-within .hero-support-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.hero-support-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.hero-support-link:hover {
    color: var(--accent-strong);
    text-decoration: underline;
}

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
    }
}

.workspace {
    display: grid;
    grid-template-columns: 210px 1fr;
    gap: 1.4rem;
    align-items: start;
}

.control-stack {
    position: sticky;
    top: 5rem;
    max-height: calc(100vh - 6rem);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-border-hover) transparent;
}

.control-stack::-webkit-scrollbar { width: 4px; }
.control-stack::-webkit-scrollbar-thumb { background: var(--accent-border-hover); border-radius: 4px; }
.control-stack::-webkit-scrollbar-track { background: transparent; }

/* ── Sidebar inner card ── */
.sidebar-inner {
    background: rgba(8, 13, 24, 0.72);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 0.9rem 0.85rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--text-muted);
    font-weight: 600;
}

.sidebar-clear-btn {
    font-size: 0.74rem;
    color: var(--accent);
    padding: 0.18rem 0.52rem;
    border-radius: 6px;
    border: 1px solid var(--accent-border-faint);
    background: transparent;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.sidebar-clear-btn:hover {
    background: var(--accent-soft);
    border-color: var(--accent-border-hover);
}

.sidebar-clear-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--focus-ring);
}

/* Override filter-list styles inside sidebar to be compact single-column */
.sidebar-filter-list .filters-group { padding: 0; border: none; background: none; }
.sidebar-filter-list .filters-group-title { display: none; }
.sidebar-filter-list .filters-options {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.sidebar-filter-list .filters-option {
    border-radius: 8px;
    padding: 0.3rem 0.45rem;
    font-size: 0.82rem;
    border: 1px solid transparent;
    background: transparent;
    transition: background 0.15s ease, border-color 0.15s ease;
}
.sidebar-filter-list .filters-option:hover {
    background: rgba(148, 163, 184, 0.08);
    border-color: rgba(148, 163, 184, 0.12);
}
.sidebar-filter-list .filters-option:has(input:checked) {
    background: var(--accent-soft);
    border-color: var(--accent-border-hover);
}
.sidebar-filter-list .count-badge {
    font-size: 0.72rem;
    padding: 0.05rem 0.32rem;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.12);
    color: var(--text-muted);
    min-width: 1.6em;
    text-align: center;
}

.panel {
    background: rgba(8, 13, 24, 0.72);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1.1rem 1.25rem;
    box-shadow: 0 22px 42px rgba(9, 13, 23, 0.32);
}

.search-card {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

/* Wide search bar above grid */
.search-wide {
    margin-bottom: 0;
}
.search-wide .search-input { width: 100%; }
.search-wide .search-input-wrapper { width: 100%; }
/* ── Hero bar (collapsible) ── */
.hero-bar {
    border-radius: 16px;
    border: 1px solid var(--border);
    background: rgba(8, 13, 24, 0.62);
    overflow: hidden;
}

.hero-toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    width: 100%;
    padding: 0.62rem 1rem;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    text-align: left;
    transition: background 0.2s ease, color 0.2s ease;
    letter-spacing: 0.01em;
}

.hero-toggle-btn:hover { background: rgba(148, 163, 184, 0.06); color: var(--text-secondary); }
.hero-toggle-btn:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--focus-ring); }

.hero-toggle-chevron {
    transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--accent);
    flex-shrink: 0;
}

.hero-toggle-btn[aria-expanded="true"] .hero-toggle-chevron {
    transform: rotate(180deg);
}

.hero-panel {
    height: 0;
    overflow: hidden;
    transition: height 0.38s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Remove the hero's own rounded corners — hero-bar provides them */
.hero-bar .hero {
    border-radius: 0;
    border: none;
    border-top: 1px solid var(--border);
    box-shadow: none;
    margin: 0;
}

.search-wide.panel {
    padding: clamp(0.85rem, 2vw, 1.2rem) clamp(0.9rem, 3vw, 1.6rem);
}

/* Simple icon buttons next to the field */
.search-config {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    border-radius: 10px;
    color: var(--text-muted);
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid rgba(148, 163, 184, 0.18);
    transition: background 0.2s ease, color 0.2s ease;
}
.search-config:hover { background: var(--accent-soft); color: var(--text-primary); }

@media (max-width: 540px) {
    .app-main {
        padding: 0.9rem 0.75rem 1.05rem;
        gap: 1rem;
        align-items: center;
    }

    .hero-bar,
    .workspace,
    .hero,
    .search-wide.panel {
        width: min(100%, 540px);
        margin-left: auto;
        margin-right: auto;
    }

    .search-input-wrapper {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        grid-template-areas:
            "input input"
            "config clear";
        align-items: stretch;
        gap: 0.55rem;
        padding: 0.6rem 0.75rem;
        background: rgba(9, 15, 26, 0.92);
    }

    .search-input {
        grid-area: input;
        width: 100%;
        padding-right: 0;
        font-size: 1rem;
    }

    .search-config {
        grid-area: config;
        width: 100%;
        height: 44px;
        border-radius: 12px;
        color: var(--text-secondary);
        background: rgba(148, 163, 184, 0.16);
        border: 1px solid rgba(148, 163, 184, 0.24);
    }

    .search-clear {
        grid-area: clear;
        width: 100%;
        height: 44px;
        border-radius: 12px;
        color: var(--text-secondary);
        background: rgba(148, 163, 184, 0.16);
        border: 1px solid rgba(148, 163, 184, 0.24);
    }

    .button-label {
        display: inline;
    }

    /* search-hint hidden on small screens — count + toggles take priority */
    .search-hint {
        display: none;
    }

    .hero {
        padding: 0.9rem;
        border-radius: 16px;
        box-shadow: 0 14px 30px rgba(10, 15, 30, 0.38);
    }

    .hero h1 {
        font-size: 1.6rem;
        line-height: 1.28;
        text-align: center;
    }

    .hero-copy {
        font-size: 0.97rem;
        text-align: center;
    }

    .hero-pill-group {
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.36rem;
    }

    .hero-pill {
        padding: 0.38rem 0.76rem;
        font-size: 0.8rem;
    }

    .mode-chip {
        flex: 0 0 auto;
        padding: 0.38rem 0.72rem;
        font-size: 0.78rem;
    }

    .workspace {
        gap: 1rem;
    }

    .tool-grid {
        grid-template-columns: 1fr;
        gap: 0.9rem;
    }

    .filter-chip-list {
        flex-wrap: nowrap;
        overflow-x: auto;
        gap: 0.42rem;
        padding: 0.3rem 0.2rem 0.45rem;
        margin-bottom: 0;
        -ms-overflow-style: none;
        scrollbar-width: none;
    }

    .filter-chip-list::-webkit-scrollbar {
        display: none;
    }

    .filter-chip {
        flex: 0 0 auto;
    }

    .tool-grid .box {
        padding: 1.05rem 1.1rem;
        min-height: auto;
    }

    .tool-grid .box.collapsed::after {
        bottom: 0.8rem;
        height: 56px;
    }
}

/* Quick Config Modal */
.quick-config-overlay {
    position: fixed;
    inset: 0;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: clamp(2.5rem, 6vh, 4rem) 1.2rem 1.2rem;
    background: rgba(3, 6, 12, 0.55);
    backdrop-filter: blur(4px);
    z-index: 9998;
    overflow-y: auto;
}
.quick-config-overlay[aria-hidden="false"] { display: flex; }

.quick-config-card {
    width: min(480px, 96vw);
    max-height: min(90vh, 480px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    padding: 1rem 1.1rem 1.2rem;
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.26);
    background: linear-gradient(150deg, rgba(24, 34, 56, 0.9), rgba(12, 18, 32, 0.76));
    box-shadow: 0 26px 44px rgba(6, 10, 20, 0.46);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    z-index: 9999;
}
.quick-config-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.quick-config-close { color: var(--text-secondary); }
.quick-config-grid {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
    overflow-y: auto;
    overflow-x: hidden;
    flex: 1;
    min-height: 0;
    padding-right: 0.35rem;
}
.quick-config-actions {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding-top: 0.25rem;
}
.quick-config-reset {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.45rem 0.95rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.18);
    background: rgba(13, 20, 34, 0.82);
    color: var(--text-secondary);
    font-size: 0.84rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: color 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
}
.quick-config-reset svg {
    width: 17px;
    height: 17px;
    pointer-events: none;
}
.quick-config-reset:hover {
    color: var(--text-primary);
    background: rgba(96, 165, 250, 0.2);
    border-color: var(--accent-border-hover);
    box-shadow: 0 12px 22px rgba(15, 23, 42, 0.35);
    transform: translateY(-1px);
}
.quick-config-reset:active {
    transform: translateY(0);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.28);
}
.quick-config-reset:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.field-label {
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(8, 14, 25, 0.92);
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 0.35rem 0.4rem 0.35rem 0.8rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1rem;
    padding: 0.55rem 0.55rem 0.55rem 0;
    outline: none;
}

.search-input::placeholder {
    color: rgba(148, 163, 184, 0.6);
}

.search-clear {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    border-radius: 50%;
    color: var(--text-muted);
    background: rgba(148, 163, 184, 0.12);
    transition: background 0.2s ease, color 0.2s ease;
}

.search-clear svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.search-clear:hover {
    color: var(--accent-strong);
    background: var(--accent-soft);
}

.button-label {
    display: none;
    font-size: 0.76rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.search-hint {
    margin: 0.45rem 0 0;
    color: var(--text-muted);
    font-size: 0.86rem;
}

.summary-panel {
    margin-top: 0.5rem;
    padding: 0;
    border: 0;
    background: transparent;
}

.summary-line {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    gap: 0.35rem;
    align-items: baseline;
    flex-wrap: wrap;
    line-height: 1.5;
}

#tool-count {
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.tool-count-dimmed #tool-count {
    color: var(--text-muted);
}

.context-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.filter-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 1.15rem;
    padding: 1.35rem 1.45rem 1.55rem;
    border-radius: 20px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    background: linear-gradient(165deg, rgba(12, 19, 36, 0.92), rgba(5, 11, 24, 0.96));
    box-shadow: 0 26px 48px rgba(6, 8, 18, 0.52);
    max-height: 70vh;
    overflow-y: auto;
    overflow-x: hidden;
    overscroll-behavior: contain;
}

.filter-card::before {
    content: "";
    position: absolute;
    top: -68px;
    right: -76px;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle at center, var(--accent-soft) 0%, transparent 72%);
    opacity: 0.8;
    pointer-events: none;
    filter: blur(10px);
}

.filter-card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 1px solid rgba(148, 163, 184, 0.14);
    pointer-events: none;
    mask: linear-gradient(180deg, rgba(255, 255, 255, 0.5) 0%, transparent 45%);
    opacity: 0.45;
}

.target-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.6rem;
    color: var(--text-muted);
}

.target-panel-header h2 {
    margin: 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

.target-grid {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.target-field {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.86rem;
    color: var(--text-muted);
}

.target-field span {
    font-weight: 500;
    color: var(--text-secondary);
}

.target-field input {
    border: 1px solid rgba(148, 163, 184, 0.26);
    border-radius: 10px;
    background: rgba(8, 13, 24, 0.9);
    color: var(--text-primary);
    padding: 0.45rem 0.7rem;
    font-size: 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.target-field input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.filter-heading {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.015em;
    text-transform: none;
    color: var(--text-secondary);
}

.filter-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: sticky;
    top: 0;
    z-index: 2;
    padding-bottom: 0.25rem;
    background: linear-gradient(165deg, rgba(12, 19, 36, 0.94), rgba(5, 11, 24, 0.98));
    backdrop-filter: blur(6px);
}

.filter-card-copy {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.filter-icon {
    flex: 0 0 auto;
    width: 48px;
    height: 48px;
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(140deg, var(--accent-soft), rgba(148, 163, 184, 0.08));
    border: 1px solid var(--accent-border-hover);
    color: var(--accent-strong);
    box-shadow: 0 18px 32px var(--accent-glow);
}

.filter-icon svg {
    width: 24px;
    height: 24px;
}

.filter-card-kicker {
    margin: 0;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.24em;
    color: var(--text-muted);
}

.filter-card-subtitle {
    margin: 0;
    font-size: 0.92rem;
    line-height: 1.55;
    color: var(--text-muted);
}

.filter-reset {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.42rem 0.85rem;
    border-radius: 10px;
    background: rgba(10, 18, 34, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.28);
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.filter-reset:hover {
    background: var(--accent-soft);
    border-color: var(--accent-border-strong);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.filter-reset svg {
    width: 16px;
    height: 16px;
}

/* Modern Filters Bar */
.filters-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    padding: 0.9rem 1rem;
    background: linear-gradient(130deg, rgba(10,16,30,0.85), rgba(16,24,42,0.85));
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 18px;
    box-shadow: 0 20px 38px rgba(6, 10, 20, 0.5);
}

.filters-left {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex: 1;
    min-width: 0;
}

.filters-launch {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.45rem 0.9rem;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.24);
    background: rgba(15, 23, 42, 0.7);
    color: var(--text-secondary);
    font-weight: 500;
}

.filters-launch:hover {
    background: var(--accent-soft);
    border-color: var(--accent-border-hover);
    color: var(--text-primary);
}

.filters-launch-icon svg { width: 18px; height: 18px; }

.selected-chips {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 0.45rem;
    padding: 0.2rem 0;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.28rem 0.6rem;
    border-radius: 999px;
    background: var(--accent-soft);
    border: 1px solid var(--accent-border-hover);
    color: var(--text-primary);
    white-space: nowrap;
    font-size: 0.85rem;
}

.chip-remove {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
}

.filters-actions { flex: 0 0 auto; }

.filters-clear {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    border-radius: 10px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    background: rgba(12, 19, 33, 0.6);
    color: var(--text-secondary);
}

.filters-clear:hover { background: var(--accent-soft); color: var(--text-primary); }

.filters-flyout {
    position: fixed;
    inset: 0;
    display: none;
    align-items: flex-start;
    justify-content: flex-end;
    padding: 5.5rem 2rem 2rem 2rem;
    background: rgba(3, 6, 12, 0.55);
    backdrop-filter: blur(4px);
    z-index: 9999;
}

.filters-flyout[aria-hidden="false"] { display: flex; }

.filters-card {
    width: min(560px, 92vw);
    max-height: 70vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem 1rem 1.1rem;
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: linear-gradient(140deg, rgba(12, 19, 36, 0.96), rgba(6, 12, 26, 0.96));
    box-shadow: 0 28px 48px rgba(6, 10, 20, 0.5);
    z-index: 10000;
}

.filters-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.filters-close { color: var(--text-secondary); }

.filters-search input {
    width: 100%;
    border: 1px solid rgba(148, 163, 184, 0.26);
    border-radius: 10px;
    background: rgba(8, 13, 24, 0.9);
    color: var(--text-primary);
    padding: 0.5rem 0.7rem;
}

.filters-list {
    overflow: auto;
    padding-right: 0.3rem;
    display: grid;
    gap: 0.9rem;
}

.filters-group {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.filters-group-title {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.72rem;
}

.filters-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.45rem 0.65rem;
}

.filters-option {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 0.45rem;
    border-radius: 10px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.16);
}

.filters-option input { accent-color: var(--accent); }

.filters-option .label-text { flex: 1; }

.filters-option.disabled {
    opacity: 0.42;
    cursor: not-allowed;
}
.filters-option.disabled .label-text {
    text-decoration: line-through;
    text-decoration-color: rgba(148, 163, 184, 0.4);
}
.filters-option.disabled input {
    cursor: not-allowed;
    pointer-events: none;
}

.count-badge {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.filter-quick-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.filter-quick-row .filter-chip {
    flex: 1 1 140px;
    justify-content: flex-start;
}

.filter-groups {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    padding: 0.85rem 0.95rem;
    border-radius: 16px;
    background: rgba(11, 18, 33, 0.78);
    border: 1px solid rgba(148, 163, 184, 0.16);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.group-label {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.24em;
    color: var(--text-muted);
}

.group-label::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-strong);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.filter-chip-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.filter-chip {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    column-gap: 0.45rem;
    padding: 0.45rem 1.08rem;
    border-radius: 12px;
    background: rgba(15, 23, 42, 0.72);
    border: 1px solid rgba(148, 163, 184, 0.16);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.filter-chip.chip-hidden {
    display: none !important;
}

.filter-chip:hover {
    background: var(--accent-soft);
    border-color: var(--accent-border-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: 0 16px 28px rgba(8, 12, 24, 0.55);
}

.filter-chip.active {
    background: var(--accent-soft-strong);
    border-color: var(--accent-border-strong);
    color: var(--text-primary);
    box-shadow: 0 16px 34px var(--accent-glow);
    transform: translateY(-1.5px);
}

.filter-chip:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: clamp(1rem, 2vw, 1.8rem);
    contain: layout style; /* scope layout/style calculations to this subtree */
    padding-bottom: 0.5rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .tool-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (min-width: 1440px) {
    .tool-grid {
        grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
        gap: clamp(1.4rem, 2.5vw, 2.4rem);
    }
}

.tool-grid .box {
    background: linear-gradient(165deg, rgba(32, 44, 70, 0.92), rgba(18, 26, 44, 0.86));
    border-radius: 18px;
    padding: 1.15rem 1.2rem;
    will-change: transform; /* GPU layer per card — smooth hover lift & expand animations */
    border: 1px solid var(--border);
    box-shadow: 0 18px 28px rgba(7, 12, 24, 0.34);
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
    min-height: var(--card-min-height);
    position: relative;
}

.tool-grid .box.collapsible {
    position: relative;
    padding-bottom: 1.6rem;
}

.tool-grid .box.collapsed {
    overflow: visible;
}

.tool-grid .box.collapsed::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 1.05rem;
    height: 80px;
    background: linear-gradient(180deg,
            rgba(18, 28, 48, 0) 0%,
            rgba(18, 28, 48, 0.82) 70%,
            rgba(18, 28, 48, 0.94) 100%);
    pointer-events: none;
    z-index: 1;
}

.tool-grid .box.collapsed::before {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0.65rem;
    width: 14px;
    height: 14px;
    border-right: 2px solid rgba(148, 163, 184, 0.5);
    border-bottom: 2px solid rgba(148, 163, 184, 0.5);
    transform: translateX(-50%) rotate(45deg);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.tool-grid .box.collapsed:hover::before,
.tool-grid .box.collapsed:focus-visible::before {
    border-color: var(--accent-border-strong);
}

.tool-grid .box-content {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    transition: height 0.4s ease, opacity 0.3s ease;
}

.tool-grid .box.animating {
    pointer-events: none;
}

.tool-grid .box.animating .box-content {
    overflow: hidden;
}

.tool-grid .box:hover {
    transform: translateY(-4px);
    border-color: var(--border-strong);
    background: linear-gradient(165deg, rgba(40, 54, 86, 0.95), rgba(20, 30, 50, 0.9));
    box-shadow: 0 22px 36px rgba(8, 13, 26, 0.42);
}

.tool-grid h2 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.tool-grid h2:not(:first-child) {
    margin-top: 0.75rem;
}

.tool-grid h4 {
    margin: 0;
    font-size: 0.88rem;
    color: var(--text-muted);
    font-weight: 500;
}

.tool-grid h4+.code-snippet {
    margin-top: 0.35rem;
}

.tool-grid .code-snippet+h4 {
    margin-top: 0.5rem;
}

.tool-grid p {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.6;
}

.tool-grid .box-content> :last-child {
    margin-bottom: 0;
}

.box-toggle {
    position: absolute;
    bottom: 1.05rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.38rem 1rem 0.38rem 0.8rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.24);
    background: rgba(18, 28, 48, 0.88);
    color: var(--text-secondary);
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.box-toggle:hover {
    border-color: var(--accent-border-hover);
    color: var(--text-primary);
    background: var(--accent-soft-hover);
    transform: translateX(-50%) translateY(-1px);
}

.tool-grid .box.expanded {
    padding-bottom: 1.15rem;
    grid-column: 1 / -1;
    width: auto;
    max-width: none;
    justify-self: center;
    padding: 1.5rem 1.8rem;
    background: rgba(18, 28, 48, 0.95);
    box-shadow: 0 32px 60px rgba(9, 13, 23, 0.55);
    transform: translateY(-6px) scale(1.01);
    transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease, background 0.4s ease;
    position: relative;
}

.tool-grid .box.expanded:hover {
    transform: translateY(-6px) scale(1.01);
}

.tool-grid .box.expanded::after {
    display: none;
}

.tool-grid .box.expanded::before {
    content: "";
    position: absolute;
    right: 1.4rem;
    top: 1.4rem;
    width: 14px;
    height: 14px;
    border-right: 2px solid rgba(148, 163, 184, 0.55);
    border-bottom: 2px solid rgba(148, 163, 184, 0.55);
    transform: rotate(-135deg);
}

.tool-grid .box.collapsible:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring), 0 18px 28px rgba(7, 12, 24, 0.34);
}

.tool-grid .box.collapsed .box-content {
    max-height: var(--card-collapsed-content-height);
    overflow: hidden;
    opacity: 0.88;
    -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 1) 0%, rgba(0, 0, 0, 1) 90%, rgba(0, 0, 0, 0.55) 95%, rgba(0, 0, 0, 0) 100%);
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 1) 0%, rgba(0, 0, 0, 1) 90%, rgba(0, 0, 0, 0.55) 95%, rgba(0, 0, 0, 0) 100%);
    transition: height 0.4s ease, opacity 0.3s ease, -webkit-mask-image 0.25s ease, mask-image 0.25s ease;
}

.tool-grid .box.expanded .box-content {
    max-height: none;
    -webkit-mask-image: none;
    mask-image: none;
    opacity: 1;
}

.box-toggle svg {
    width: 0.75rem;
    height: 0.75rem;
    transform: rotate(0deg);
    transition: transform 0.2s ease;
}

.tool-grid .box.expanded .box-toggle svg {
    transform: rotate(180deg);
}

.tool-grid a {
    color: #60a5fa;
}

.tool-grid a:hover {
    color: #93c5fd;
}

.code-snippet {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 14px;
    padding: 0.65rem 0.85rem;
    position: relative;
}

.code-snippet::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 14px;
    border: 1px solid var(--accent-border-faint);
    pointer-events: none;
}

.code-snippet code {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-word;
}

.copy-icon {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid rgba(148, 163, 184, 0.18);
    color: var(--text-secondary);
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.copy-icon:hover {
    background: var(--accent-soft-hover);
    border-color: var(--accent-border-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.copy-icon svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
    pointer-events: none;
}

.highlight-legacy-removed {
    /* consolidated into bottom highlight rule */
    background: transparent;
    padding: 0 0.15em;
}

.app-footer {
    margin-top: auto;
    padding: 1.4rem clamp(1.5rem, 5vw, 3.5rem);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    background: rgba(6, 10, 20, 0.85);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(18px);
}

.app-footer a {
    color: var(--text-secondary);
}

.app-footer a:hover {
    color: var(--accent-strong);
}

@media (max-width: 860px) {
    /* Header: stay single row, just compact */
    .brand-subtitle { display: none; }
    .support-link { display: none; }
    .header-actions { gap: 0.5rem; }

    /* Workspace: sidebar collapses above tool grid */
    .workspace {
        grid-template-columns: 1fr;
    }

    /* Sidebar: collapsible drawer, closed by default */
    .control-stack {
        position: static;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
    }

    .control-stack.mobile-open {
        max-height: 1200px;
    }

    /* Show mobile filter button */
    .mobile-filter-btn {
        display: inline-flex;
    }

    .tool-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
}

@media (max-width: 640px) {
    .app-main {
        width: 94vw;
    }

    .workspace {
        gap: 1.1rem;
    }

    .hero {
        padding: 1.1rem;
    }

    .hero h1 {
        font-size: 1.9rem;
    }

    .filter-chip {
        font-size: 0.85rem;
        padding: 0.38rem 0.85rem;
    }

    .filter-card {
        gap: 1rem;
        padding: 1.1rem 1.1rem 1.3rem;
        max-height: 72vh;
    }

    .filter-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .filter-reset {
        margin-left: 0;
    }

    .filter-quick-row .filter-chip {
        flex: 0 0 auto;
    }
    .filter-quick-row {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
        scrollbar-color: var(--accent-border-hover) transparent;
        padding-bottom: 0.2rem;
        margin-bottom: 0.2rem;
    }
    .filter-quick-row::-webkit-scrollbar { height: 6px; }
    .filter-quick-row::-webkit-scrollbar-thumb { background: var(--accent-border-hover); border-radius: 999px; }
    .filter-quick-row::-webkit-scrollbar-track { background: transparent; }

    .filter-group {
        padding: 0.75rem 0.8rem;
    }

    .target-flyout {
        top: clamp(1.4rem, 6vh, 2.5rem);
        right: clamp(0.8rem, 5vw, 1.6rem);
        left: auto;
        width: min(94vw, 360px);
    }

    .target-flyout::before {
        left: auto;
        right: clamp(1.4rem, 24%, 2rem);
    }

    .target-flyout-card {
        padding: 1.2rem 1.1rem 1.35rem;
        border-radius: 16px;
    }

    .target-flyout-close {
        width: 32px;
        height: 32px;
        top: 0.45rem;
        right: 0.45rem;
    }

    .mode-toggle {
        gap: 0.3rem;
    }

    .tool-grid {
        grid-template-columns: 1fr;
    }

    .tool-grid .box {
        padding: 1.05rem 1.15rem;
    }

    .filter-chip-list {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        max-height: none;
        padding: 0.7rem 0.6rem;
    }

    .tool-grid .box.collapsible {
        padding-bottom: 1.9rem;
    }

    .tool-grid .box.collapsed::after {
        bottom: 0.8rem;
        height: 64px;
    }

    .tool-grid .box.expanded {
        width: 100%;
        padding: 1.3rem 1.25rem;
    }
}

/* ─── Search meta row (hint + count + view toggle) ─────────────── */
.search-meta-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.search-meta-row .search-hint {
    flex: 1;
    margin: 0 !important;
    min-width: 0;
}

.search-meta-row .summary-panel {
    flex-shrink: 0;
    margin-top: 0;
}

.search-meta-row .summary-line {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ─── View toggle (List / Grid) ─────────────────────────────────── */
.view-toggle-group {
    display: flex;
    gap: 0.2rem;
    flex-shrink: 0;
}

.view-btn {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    border: 1px solid rgba(148, 163, 184, 0.18);
    background: rgba(15, 23, 42, 0.5);
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.view-btn:hover {
    background: var(--accent-soft);
    color: var(--text-primary);
    border-color: var(--accent-border-hover);
}

.view-btn.view-btn-active {
    background: var(--accent-soft-strong);
    border-color: var(--accent-border-strong);
    color: var(--text-primary);
}

.view-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--focus-ring);
}

/* ─── List view ─────────────────────────────────────────────────── */
.tool-grid.view-list {
    grid-template-columns: 1fr;
    gap: 0.3rem;
}

.tool-grid.view-list .box {
    min-height: auto;
    padding: 0.65rem 1rem;
    flex-direction: row;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
}

/* Side accent stripe */
.tool-grid.view-list .box[data-side="red"] { border-left: 3px solid rgba(244, 63, 94, 0.55); }
.tool-grid.view-list .box[data-side="blue"] { border-left: 3px solid rgba(59, 130, 246, 0.55); }

.tool-grid.view-list .box-content {
    flex: 1;
    flex-direction: row;
    align-items: center;
    gap: 0.9rem;
    max-height: 1.6rem;
    overflow: hidden;
    -webkit-mask-image: none !important;
    mask-image: none !important;
}

/* In list mode, collapsed pseudo-elements are not needed */
.tool-grid.view-list .box.collapsed::after,
.tool-grid.view-list .box.collapsed::before { display: none; }

.tool-grid.view-list h2 {
    flex-shrink: 0;
    width: 190px;
    font-size: 0.88rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
}

.tool-grid.view-list h4 {
    flex: 1;
    font-size: 0.81rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0.72;
}

.tool-grid.view-list .code-snippet { display: none; }
.tool-grid.view-list p { display: none; }
.tool-grid.view-list .box-toggle { display: none; }

/* Expanded card in list mode: restore column layout */
.tool-grid.view-list .box.expanded {
    grid-column: 1;
    flex-direction: column;
    align-items: flex-start;
    min-height: auto;
    padding: 1rem;
    gap: 0.55rem;
}

.tool-grid.view-list .box.expanded .box-content {
    flex-direction: column;
    align-items: flex-start;
    max-height: none;
    gap: 0.55rem;
}

.tool-grid.view-list .box.expanded h2 {
    width: auto;
    white-space: normal;
    font-size: 1rem;
}

.tool-grid.view-list .box.expanded h4 { white-space: normal; opacity: 1; }
.tool-grid.view-list .box.expanded .code-snippet { display: flex; }
.tool-grid.view-list .box.expanded p { display: block; }

/* ─── Mobile filter button (hidden on desktop) ───────────────────── */
.mobile-filter-btn {
    display: none;
    align-items: center;
    gap: 0.38rem;
    padding: 0.3rem 0.7rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(15, 23, 42, 0.5);
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
    line-height: 1;
}

.mobile-filter-btn:hover {
    background: var(--accent-soft);
    color: var(--text-primary);
    border-color: var(--accent-border-hover);
}

.mobile-filter-btn.is-open {
    background: var(--accent-soft-strong);
    border-color: var(--accent-border-strong);
    color: var(--text-primary);
}

.mobile-filter-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--focus-ring);
}

.mobile-filter-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: 8px;
    font-size: 0.65rem;
    font-weight: 700;
    background: var(--accent);
    color: #fff;
    line-height: 1;
}

.mobile-filter-badge[hidden] { display: none; }

/* ─── Keyboard shortcut badge ──────────────────────────────────── */
.kbd-hint {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    line-height: 1;
    padding: 0.15rem 0.38rem;
    border-radius: 5px;
    border: 1px solid rgba(148, 163, 184, 0.28);
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-muted);
    vertical-align: middle;
    letter-spacing: 0;
    user-select: none;
}

/* ─── Empty state ───────────────────────────────────────────────── */
.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.85rem;
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-muted);
}

.empty-state[hidden] { display: none; }

.empty-state svg {
    width: 52px;
    height: 52px;
    opacity: 0.45;
    color: var(--accent);
}

.empty-state-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.empty-state-body {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.empty-state-reset {
    margin-top: 0.5rem;
    padding: 0.52rem 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--accent-border-hover);
    background: var(--accent-soft);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.empty-state-reset:hover {
    background: var(--accent-soft-hover);
    border-color: var(--accent-border-strong);
    transform: translateY(-1px);
}

.empty-state-reset:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

/* ─── Toast notifications ───────────────────────────────────────── */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    z-index: 1000;
    pointer-events: none;
}

.toast {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.65rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(12, 18, 34, 0.96);
    backdrop-filter: blur(12px);
    color: var(--text-primary);
    font-size: 0.88rem;
    font-weight: 500;
    box-shadow: 0 18px 34px rgba(4, 8, 20, 0.55);
    pointer-events: auto;
    transform: translateY(16px);
    opacity: 0;
    transition: transform 0.22s ease, opacity 0.22s ease;
    max-width: 320px;
}

.toast.toast-visible {
    transform: translateY(0);
    opacity: 1;
}

.toast.toast-success { border-color: rgba(52, 211, 153, 0.35); }
.toast.toast-error   { border-color: rgba(248, 113, 113, 0.35); }

.toast-icon {
    flex-shrink: 0;
    display: inline-flex;
    width: 18px;
    height: 18px;
}

.toast-icon svg { width: 100%; height: 100%; }

.toast.toast-success .toast-icon { color: #34d399; }
.toast.toast-error   .toast-icon { color: #f87171; }

/* ─── Floating scroll-to-top button ────────────────────────────── */
.scroll-top-btn {
    position: fixed;
    bottom: 1.5rem;
    left: 1.5rem;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(12, 18, 34, 0.92);
    backdrop-filter: blur(12px);
    color: var(--text-secondary);
    box-shadow: 0 14px 28px rgba(4, 8, 20, 0.45);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 900;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s ease,
        border-color 0.2s ease, color 0.2s ease;
    pointer-events: none;
}

.scroll-top-btn[hidden] { display: none; }

.scroll-top-btn.scroll-top-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.scroll-top-btn:hover {
    background: var(--accent-soft);
    border-color: var(--accent-border-hover);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.scroll-top-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.scroll-top-btn svg {
    width: 18px;
    height: 18px;
}

/* ─── Screen-reader utility ─────────────────────────────────────── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ─── Search highlight ───────────────────────────────────────────── */
.highlight {
    background: rgba(251, 191, 36, 0.22);
    color: #fbbf24;
    border-radius: 3px;
    padding: 0 2px;
}

/* ─── Reduced motion ─────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .scroll-top-btn,
    .toast {
        transition: none;
    }
}