/*
 * 百杉首页 · 10 套 AI 科技主题实验室
 * 只覆盖视觉变量和展示状态，不改动首页业务内容。
 */

body.theme-demo {
    --page-bg: #06101d;
    --section-a: #06101d;
    --section-b: #081a2d;
    --hero-glow: rgba(67, 217, 255, 0.24);
    --hero-glow-alt: rgba(47, 123, 255, 0.2);
    --panel: rgba(255, 255, 255, 0.055);
    --panel-strong: rgba(255, 255, 255, 0.1);
    --line: rgba(255, 255, 255, 0.12);
    --text: #f8fbff;
    --muted: #a8b8cb;
    --accent-a: #43d9ff;
    --accent-b: #2f7bff;
    --accent-c: #7cf7d4;
    --nav-bg: rgba(5, 15, 28, 0.78);
    --nav-text: #f8fbff;
    --shadow: rgba(0, 10, 24, 0.44);
    --image-filter: saturate(1.02) contrast(1.03);
    position: relative;
    background: var(--page-bg) !important;
    color: var(--text) !important;
    transition: background-color 0.35s ease, color 0.35s ease;
}

/* 01 · 量子青蓝 */
body.theme-demo.theme-cyan {
    --page-bg: #06101d;
    --section-a: #06101d;
    --section-b: #081a2d;
    --hero-glow: rgba(67, 217, 255, 0.26);
    --hero-glow-alt: rgba(47, 123, 255, 0.2);
    --accent-a: #43d9ff;
    --accent-b: #2f7bff;
    --accent-c: #7cf7d4;
}

/* 02 · 神经薄荷 */
body.theme-demo.theme-mint {
    --page-bg: #061510;
    --section-a: #061510;
    --section-b: #0a201a;
    --hero-glow: rgba(44, 255, 196, 0.24);
    --hero-glow-alt: rgba(68, 168, 255, 0.14);
    --accent-a: #2cffc4;
    --accent-b: #44a8ff;
    --accent-c: #b7ff5a;
    --nav-bg: rgba(4, 22, 17, 0.8);
}

/* 03 · 极昼冰蓝（唯一浅色主题） */
body.theme-demo.theme-ice {
    --page-bg: #eef6ff;
    --section-a: #f7faff;
    --section-b: #eaf3ff;
    --hero-glow: rgba(17, 103, 255, 0.18);
    --hero-glow-alt: rgba(24, 182, 217, 0.18);
    --panel: rgba(255, 255, 255, 0.68);
    --panel-strong: rgba(255, 255, 255, 0.92);
    --line: rgba(17, 103, 255, 0.15);
    --text: #102033;
    --muted: #52657c;
    --accent-a: #1167ff;
    --accent-b: #18b6d9;
    --accent-c: #16a97c;
    --nav-bg: rgba(255, 255, 255, 0.82);
    --nav-text: #102033;
    --shadow: rgba(47, 123, 255, 0.13);
    --image-filter: saturate(0.96) contrast(1.01);
}

/* 04 · 光子珊瑚 */
body.theme-demo.theme-coral {
    --page-bg: #0b1021;
    --section-a: #0b1021;
    --section-b: #11182d;
    --hero-glow: rgba(255, 122, 89, 0.22);
    --hero-glow-alt: rgba(0, 194, 255, 0.16);
    --accent-a: #ff7a59;
    --accent-b: #00c2ff;
    --accent-c: #ffd166;
    --nav-bg: rgba(11, 16, 33, 0.8);
}

/* 05 · 星云紫境（原紫色主题的高阶版本） */
body.theme-demo.theme-violet {
    --page-bg: #0e0b20;
    --section-a: #0e0b20;
    --section-b: #16112d;
    --hero-glow: rgba(146, 96, 255, 0.24);
    --hero-glow-alt: rgba(0, 232, 210, 0.16);
    --accent-a: #9260ff;
    --accent-b: #00e8d2;
    --accent-c: #ff6bd6;
    --nav-bg: rgba(14, 11, 32, 0.8);
}

/* 06 · 钴蓝矩阵 */
body.theme-demo.theme-cobalt {
    --page-bg: #050b20;
    --section-a: #050b20;
    --section-b: #081332;
    --hero-glow: rgba(45, 91, 255, 0.3);
    --hero-glow-alt: rgba(0, 168, 255, 0.2);
    --accent-a: #2d5bff;
    --accent-b: #00a8ff;
    --accent-c: #89a7ff;
    --nav-bg: rgba(5, 11, 32, 0.82);
}

/* 07 · 极光青柠 */
body.theme-demo.theme-lime {
    --page-bg: #080e0b;
    --section-a: #080e0b;
    --section-b: #101a12;
    --hero-glow: rgba(199, 255, 61, 0.2);
    --hero-glow-alt: rgba(23, 230, 161, 0.18);
    --accent-a: #c7ff3d;
    --accent-b: #17e6a1;
    --accent-c: #eaffad;
    --nav-bg: rgba(8, 14, 11, 0.82);
    --muted: #aebdac;
}

/* 08 · 恒星琥珀 */
body.theme-demo.theme-amber {
    --page-bg: #151008;
    --section-a: #151008;
    --section-b: #20170b;
    --hero-glow: rgba(255, 176, 46, 0.23);
    --hero-glow-alt: rgba(255, 104, 70, 0.17);
    --accent-a: #ffb02e;
    --accent-b: #ff6846;
    --accent-c: #ffe680;
    --nav-bg: rgba(21, 16, 8, 0.82);
    --muted: #c2b6a5;
}

/* 09 · 等离子玫红 */
body.theme-demo.theme-plasma {
    --page-bg: #11091a;
    --section-a: #11091a;
    --section-b: #1b0e27;
    --hero-glow: rgba(255, 62, 209, 0.22);
    --hero-glow-alt: rgba(53, 229, 255, 0.16);
    --accent-a: #ff3ed1;
    --accent-b: #7148ff;
    --accent-c: #35e5ff;
    --nav-bg: rgba(17, 9, 26, 0.82);
}

/* 10 · 月面银灰 */
body.theme-demo.theme-lunar {
    --page-bg: #0b0f15;
    --section-a: #0b0f15;
    --section-b: #121821;
    --hero-glow: rgba(243, 247, 255, 0.15);
    --hero-glow-alt: rgba(114, 216, 255, 0.16);
    --panel: rgba(231, 239, 250, 0.045);
    --panel-strong: rgba(231, 239, 250, 0.09);
    --line: rgba(214, 226, 241, 0.14);
    --text: #f3f7ff;
    --muted: #98a7bd;
    --accent-a: #f3f7ff;
    --accent-b: #98a7bd;
    --accent-c: #72d8ff;
    --nav-bg: rgba(11, 15, 21, 0.84);
    --image-filter: saturate(0.72) contrast(1.08);
}

/* 全局背景：网格 + 双光源 */
body.theme-demo::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        linear-gradient(color-mix(in srgb, var(--accent-a), transparent 96%) 1px, transparent 1px),
        linear-gradient(90deg, color-mix(in srgb, var(--accent-a), transparent 96%) 1px, transparent 1px),
        radial-gradient(circle at 12% 8%, var(--hero-glow), transparent 26%),
        radial-gradient(circle at 88% 18%, var(--hero-glow-alt), transparent 28%);
    background-size: 72px 72px, 72px 72px, auto, auto;
    mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.45) 60%, transparent 100%);
}

body.theme-demo > .fixed.top-0.left-0.right-0 {
    padding: 10px 14px 0;
    pointer-events: none;
}

body.theme-demo nav {
    max-width: 1460px;
    margin: 0 auto;
    /* 导航使用本机字体，避免外部字体加载前后改变菜单宽度。 */
    font-family: system-ui, sans-serif;
    pointer-events: auto;
    background: linear-gradient(120deg,
        color-mix(in srgb, var(--nav-bg), #344054 25%),
        color-mix(in srgb, var(--nav-bg), #253b50 30%)) !important;
    border: 1px solid color-mix(in srgb, var(--line), white 9%) !important;
    border-radius: 18px !important;
    box-shadow: 0 16px 50px var(--shadow) !important;
    backdrop-filter: blur(20px) saturate(1.3);
    -webkit-backdrop-filter: blur(20px) saturate(1.3);
}

body.theme-demo nav #mobileMenu {
    background: transparent !important;
}

/* 所有页面共用相同字重与按钮宽度，选中状态只改变颜色。 */
body.theme-demo nav .site-nav-links > a:not([href*="#"]) {
    font-size: 16px;
    font-weight: 500;
    line-height: 24px;
    white-space: nowrap;
}

body.theme-demo nav > div:first-child a[href="about.html#contact"] {
    width: 122px;
    flex-shrink: 0;
    justify-content: center;
    white-space: nowrap;
}

body.theme-demo.theme-ice nav {
    background: linear-gradient(120deg, rgba(255,255,255,.94), rgba(232,241,252,.92)) !important;
}

body.theme-demo nav a,
body.theme-demo nav button,
body.theme-demo nav span {
    color: var(--nav-text) !important;
}

body.theme-demo nav a:hover,
body.theme-demo nav a[aria-current="page"] {
    color: var(--accent-a) !important;
}

/* 全站导航 Logo：仅保留扫光、悬浮提亮与浅色主题降光 */
body.theme-demo nav .nav-logo-frame {
    isolation: isolate;
    width: 108px !important;
    height: 31px !important;
    background: transparent;
    box-shadow: none;
    transition: transform .3s ease;
}

body.theme-demo nav .nav-logo-frame::after {
    content: '';
    position: absolute;
    z-index: 2;
    top: -55%;
    bottom: -55%;
    left: -34%;
    width: 27%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,.72), transparent);
    filter: blur(2px);
    transform: skewX(-18deg);
    opacity: .72;
    pointer-events: none;
    animation: navLogoSweep 4.8s ease-in-out infinite;
}

body.theme-demo nav .nav-logo-frame img[src*="byesame-logo-"] {
    z-index: 1;
    left: -4.5px !important;
    top: -6.2px !important;
    width: auto !important;
    height: 40.5px !important;
    opacity: 1 !important;
    filter: brightness(1.28) saturate(1.08) !important;
    transition: filter .3s ease, transform .3s ease;
}

@media (min-width: 768px) {
    body.theme-demo nav .nav-logo-frame {
        width: 124px !important;
        height: 36px !important;
    }

    body.theme-demo nav .nav-logo-frame img[src*="byesame-logo-"] {
        left: -5.5px !important;
        top: -7.1px !important;
        height: 46.7px !important;
    }
}

body.theme-demo nav .nav-logo-frame:hover {
    transform: translateY(-1px) scale(1.035);
}

body.theme-demo nav .nav-logo-frame:hover img[src*="byesame-logo-"] {
    filter: brightness(1.58) saturate(1.16) !important;
}

body.theme-demo.theme-ice nav .nav-logo-frame::after {
    background: linear-gradient(90deg, transparent, rgba(255,255,255,.32), transparent);
}

body.theme-demo.theme-ice nav .nav-logo-frame img[src*="byesame-logo-"] {
    filter: brightness(1.04) saturate(.98) !important;
}

body.theme-demo.theme-ice nav .nav-logo-frame:hover img[src*="byesame-logo-"] {
    filter: brightness(1.22) saturate(1.02) !important;
}

body.theme-demo footer img[src*="byesame-logo-green"] {
    filter: none !important;
}

@keyframes navLogoSweep {
    0%, 58% { transform: translateX(0) skewX(-18deg); opacity: 0; }
    66% { opacity: .75; }
    86%, 100% { transform: translateX(560%) skewX(-18deg); opacity: 0; }
}

body.theme-demo section {
    background: var(--section-a) !important;
    color: var(--text) !important;
    transition: background-color 0.35s ease;
}

body.theme-demo section:nth-of-type(even) {
    background: var(--section-b) !important;
}

body.theme-demo section:first-of-type,
body.theme-demo .hero-gradient,
body.theme-demo .hero-video-section {
    background:
        radial-gradient(circle at 50% 34%, var(--hero-glow), transparent 36%),
        radial-gradient(circle at 82% 16%, var(--hero-glow-alt), transparent 30%),
        linear-gradient(180deg, var(--section-a) 0%, var(--section-b) 100%) !important;
}

body.theme-demo .hero-video-bg {
    background: var(--section-a) !important;
}

body.theme-demo .hero-video-bg::before {
    background:
        radial-gradient(circle at 50% 36%, var(--hero-glow), transparent 34%),
        radial-gradient(circle at 82% 18%, var(--hero-glow-alt), transparent 28%),
        linear-gradient(90deg, color-mix(in srgb, var(--section-a), transparent 4%) 0%, color-mix(in srgb, var(--section-a), transparent 28%) 50%, color-mix(in srgb, var(--section-a), transparent 3%) 100%),
        linear-gradient(180deg, color-mix(in srgb, var(--section-a), transparent 12%) 0%, color-mix(in srgb, var(--section-a), transparent 34%) 42%, var(--section-a) 100%) !important;
}

body.theme-demo .hero-video-bg::after {
    background: linear-gradient(180deg, transparent 0%, var(--section-b) 100%) !important;
}

body.theme-demo .hero-video-light {
    background: linear-gradient(115deg, transparent 0%, color-mix(in srgb, var(--accent-b), transparent 88%) 43%, color-mix(in srgb, var(--accent-a), transparent 72%) 50%, color-mix(in srgb, var(--accent-b), transparent 88%) 57%, transparent 100%) !important;
}

body.theme-demo .hero-title-panel::before {
    background: radial-gradient(circle at 50% 45%, var(--hero-glow), transparent 62%) !important;
}

body.theme-demo .hero-eyebrow,
body.theme-demo .hero-video-toggle {
    background: color-mix(in srgb, var(--panel-strong), transparent 8%) !important;
    border-color: color-mix(in srgb, var(--accent-a), transparent 68%) !important;
    box-shadow: 0 0 44px color-mix(in srgb, var(--accent-a), transparent 82%) !important;
    color: var(--text) !important;
}

body.theme-demo #hero-canvas {
    opacity: 0.46;
    filter: saturate(1.25) contrast(1.05);
}

body.theme-demo.theme-mint #hero-canvas { filter: hue-rotate(82deg) saturate(1.35); }
body.theme-demo.theme-ice #hero-canvas { opacity: 0.22; filter: saturate(0.8) brightness(1.4); }
body.theme-demo.theme-coral #hero-canvas { filter: hue-rotate(126deg) saturate(1.35); }
body.theme-demo.theme-violet #hero-canvas { filter: hue-rotate(32deg) saturate(1.3); }
body.theme-demo.theme-cobalt #hero-canvas { filter: hue-rotate(12deg) saturate(1.55); }
body.theme-demo.theme-lime #hero-canvas { filter: hue-rotate(95deg) saturate(1.7); }
body.theme-demo.theme-amber #hero-canvas { filter: hue-rotate(152deg) saturate(1.45); }
body.theme-demo.theme-plasma #hero-canvas { filter: hue-rotate(42deg) saturate(1.65); }
body.theme-demo.theme-lunar #hero-canvas { opacity: 0.32; filter: grayscale(0.82) hue-rotate(18deg); }

body.theme-demo .gradient-text,
body.theme-demo .hero-main-title .gradient-text {
    background: linear-gradient(125deg, var(--accent-a) 0%, var(--accent-b) 56%, var(--accent-c) 100%) !important;
    background-size: 180% 180% !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    color: var(--accent-a) !important;
    filter: drop-shadow(0 0 24px color-mix(in srgb, var(--accent-a), transparent 80%));
}

body.theme-demo .gradient-bg {
    background: linear-gradient(125deg, var(--accent-a) 0%, var(--accent-b) 62%, var(--accent-c) 125%) !important;
    background-size: 180% 180% !important;
    color: #fff !important;
    box-shadow: 0 14px 38px color-mix(in srgb, var(--accent-a), transparent 68%) !important;
}

body.theme-demo.theme-lime .gradient-bg,
body.theme-demo.theme-amber .gradient-bg,
body.theme-demo.theme-lunar .gradient-bg,
body.theme-demo.theme-ice .gradient-bg {
    color: #081018 !important;
}

body.theme-demo .glow-button {
    border-color: color-mix(in srgb, var(--accent-a), transparent 58%) !important;
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent-a), transparent 62%), 0 16px 38px color-mix(in srgb, var(--accent-b), transparent 70%) !important;
}

body.theme-demo .glow-button:hover {
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent-a), transparent 35%), 0 20px 54px color-mix(in srgb, var(--accent-a), transparent 55%) !important;
}

body.theme-demo .bg-primary,
body.theme-demo .from-primary,
body.theme-demo .to-primary {
    background-color: transparent !important;
}

body.theme-demo [class*="bg-white/5"],
body.theme-demo [class*="bg-white/10"],
body.theme-demo .project-card,
body.theme-demo .glass-card,
body.theme-demo .card-hover {
    background: linear-gradient(145deg, var(--panel-strong), var(--panel)) !important;
    border-color: var(--line) !important;
    box-shadow: 0 16px 44px var(--shadow) !important;
    backdrop-filter: blur(14px) saturate(1.15);
    -webkit-backdrop-filter: blur(14px) saturate(1.15);
}

/* 导师页与课程页的共用组件也跟随主题变量 */
body.theme-demo .chip,
body.theme-demo .content-tag,
body.theme-demo .project-tag,
body.theme-demo .outline-item-num {
    background: color-mix(in srgb, var(--accent-a), transparent 88%) !important;
    border-color: color-mix(in srgb, var(--accent-a), transparent 66%) !important;
    color: color-mix(in srgb, var(--accent-a), var(--text) 24%) !important;
}

body.theme-demo .red-chip,
body.theme-demo .red-name-chip,
body.theme-demo .job-number,
body.theme-demo .tech-icon-circle,
body.theme-demo .outline-item.active .outline-item-num {
    background: linear-gradient(135deg, var(--accent-a), var(--accent-b)) !important;
    color: #fff !important;
    box-shadow: 0 8px 24px color-mix(in srgb, var(--accent-a), transparent 68%) !important;
}

body.theme-demo.theme-ice .red-chip,
body.theme-demo.theme-ice .red-name-chip,
body.theme-demo.theme-ice .job-number,
body.theme-demo.theme-ice .tech-icon-circle,
body.theme-demo.theme-lime .red-chip,
body.theme-demo.theme-lime .red-name-chip,
body.theme-demo.theme-lime .job-number,
body.theme-demo.theme-lime .tech-icon-circle,
body.theme-demo.theme-amber .red-chip,
body.theme-demo.theme-amber .red-name-chip,
body.theme-demo.theme-amber .job-number,
body.theme-demo.theme-amber .tech-icon-circle,
body.theme-demo.theme-lunar .red-chip,
body.theme-demo.theme-lunar .red-name-chip,
body.theme-demo.theme-lunar .job-number,
body.theme-demo.theme-lunar .tech-icon-circle {
    color: #081018 !important;
}

body.theme-demo .industry-card::before {
    background: radial-gradient(circle, color-mix(in srgb, var(--accent-a), transparent 82%), transparent 70%) !important;
}

body.theme-demo .data-card::before,
body.theme-demo .content-section-title::before {
    background: linear-gradient(90deg, var(--accent-a), var(--accent-b)) !important;
}

body.theme-demo .outline-item:hover {
    background: color-mix(in srgb, var(--accent-a), transparent 91%) !important;
    color: var(--text) !important;
}

body.theme-demo .outline-item.active {
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent-a), transparent 82%), color-mix(in srgb, var(--accent-b), transparent 84%)) !important;
    border-color: color-mix(in srgb, var(--accent-a), transparent 58%) !important;
    color: var(--text) !important;
    box-shadow: 0 8px 24px color-mix(in srgb, var(--accent-a), transparent 82%) !important;
}

body.theme-demo .content-section-title {
    color: color-mix(in srgb, var(--accent-a), var(--text) 24%) !important;
}

body.theme-demo .teacher-label,
body.theme-demo .outline-item,
body.theme-demo .content-text {
    color: var(--muted) !important;
}

body.theme-demo .card-hover:hover,
body.theme-demo .project-card:hover {
    transform: translateY(-5px);
    border-color: color-mix(in srgb, var(--accent-a), transparent 44%) !important;
    box-shadow: 0 24px 62px color-mix(in srgb, var(--accent-b), transparent 78%) !important;
}

body.theme-demo .text-gray-300,
body.theme-demo .text-gray-400,
body.theme-demo .text-gray-500,
body.theme-demo p,
body.theme-demo td {
    color: var(--muted) !important;
}

body.theme-demo h1,
body.theme-demo h2,
body.theme-demo h3,
body.theme-demo h4,
body.theme-demo th,
body.theme-demo .text-white {
    color: var(--text) !important;
}

body.theme-demo .text-accent-blue,
body.theme-demo .text-accent-purple {
    color: var(--accent-a) !important;
}

body.theme-demo .bg-accent-blue,
body.theme-demo .bg-accent-purple {
    background-color: var(--accent-a) !important;
}

body.theme-demo .bg-accent-blue\/20,
body.theme-demo .bg-accent-purple\/20 {
    background-color: color-mix(in srgb, var(--accent-a), transparent 82%) !important;
}

body.theme-demo .border-white\/5,
body.theme-demo .border-white\/10,
body.theme-demo .border-white\/20,
body.theme-demo .border-gray-700 {
    border-color: var(--line) !important;
}

body.theme-demo .grid-bg {
    background-image:
        linear-gradient(color-mix(in srgb, var(--accent-a), transparent 94%) 1px, transparent 1px),
        linear-gradient(90deg, color-mix(in srgb, var(--accent-a), transparent 94%) 1px, transparent 1px) !important;
    background-size: 64px 64px !important;
}

body.theme-demo .carousel-btn {
    background: color-mix(in srgb, var(--section-b), transparent 10%) !important;
    border-color: color-mix(in srgb, var(--accent-a), transparent 45%) !important;
    color: var(--accent-a) !important;
}

body.theme-demo table,
body.theme-demo thead,
body.theme-demo tbody tr {
    background: transparent !important;
}

body.theme-demo img {
    filter: var(--image-filter);
}

body.theme-demo footer {
    background: color-mix(in srgb, var(--section-a), #000 14%) !important;
    border-color: var(--line) !important;
    color: var(--text) !important;
}

body.theme-demo.theme-ice .hero-video-bg video {
    opacity: 0.19;
    filter: saturate(0.65) contrast(0.9) brightness(1.35);
}

body.theme-demo.theme-ice .hero-subtitle,
body.theme-demo.theme-ice .hero-video-toggle,
body.theme-demo.theme-ice .hero-eyebrow {
    color: #33485f !important;
}

/* ========== 主题实验室 ========== */
.theme-lab {
    position: fixed;
    top: 106px;
    right: 18px;
    z-index: 90;
    width: 304px;
    color: #edf5ff;
    font-family: Inter, system-ui, sans-serif;
}

.theme-lab-trigger {
    position: absolute;
    top: 0;
    right: 0;
    display: none;
    align-items: center;
    gap: 9px;
    min-height: 46px;
    padding: 0 12px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 14px;
    background: rgba(7, 13, 25, 0.9);
    color: #f3f7ff;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.theme-lab.is-collapsed .theme-lab-trigger { display: inline-flex; }
.theme-lab.is-collapsed .theme-lab-panel { display: none; }

.theme-lab-coachmark {
    position: absolute;
    top: 58px;
    right: 0;
    display: none;
    grid-template-columns: 34px minmax(0, 1fr) auto;
    align-items: center;
    gap: 10px;
    width: 304px;
    min-height: 86px;
    padding: 13px 13px 13px 12px;
    border: 1px solid rgba(146, 96, 255, 0.42);
    border-radius: 17px;
    background:
        linear-gradient(135deg, rgba(146, 96, 255, 0.17), rgba(0, 232, 210, 0.08)),
        rgba(9, 12, 27, 0.94);
    color: #f7fbff;
    text-align: left;
    cursor: pointer;
    box-shadow: 0 22px 64px rgba(0, 0, 0, 0.38), 0 0 38px rgba(146, 96, 255, 0.13);
    backdrop-filter: blur(22px) saturate(1.25);
    -webkit-backdrop-filter: blur(22px) saturate(1.25);
    transform-origin: top right;
}

.theme-lab-coachmark::before {
    content: "";
    position: absolute;
    top: -6px;
    right: 28px;
    width: 11px;
    height: 11px;
    border-top: 1px solid rgba(146, 96, 255, 0.42);
    border-left: 1px solid rgba(146, 96, 255, 0.42);
    background: #11142d;
    transform: rotate(45deg);
}

.theme-lab.is-collapsed.is-intro-visible .theme-lab-coachmark {
    display: grid;
    animation: themeCoachmarkIn 0.45s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.theme-lab.is-intro-visible .theme-lab-trigger {
    border-color: rgba(146, 96, 255, 0.48);
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28), 0 0 0 5px rgba(146, 96, 255, 0.08), 0 0 30px rgba(146, 96, 255, 0.2);
    animation: themeTriggerPulse 2.2s ease-in-out infinite;
}

.theme-lab-coachmark-icon {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 11px;
    background: linear-gradient(135deg, #9260ff, #00e8d2);
    color: #fff;
    font-size: 17px;
    box-shadow: 0 8px 22px rgba(146, 96, 255, 0.35);
}

.theme-lab-coachmark-copy {
    display: block;
    min-width: 0;
}

.theme-lab-coachmark-copy strong {
    display: block;
    margin-bottom: 3px;
    color: #f7fbff;
    font-size: 13px;
    line-height: 1.35;
}

.theme-lab-coachmark-copy small {
    display: block;
    color: #98a8bc;
    font-size: 10px;
    line-height: 1.45;
}

.theme-lab-coachmark-action {
    align-self: center;
    color: #7cf7d4;
    font-size: 10px;
    font-weight: 800;
    white-space: nowrap;
}

.theme-lab-coachmark:hover {
    border-color: rgba(0, 232, 210, 0.5);
    background:
        linear-gradient(135deg, rgba(146, 96, 255, 0.22), rgba(0, 232, 210, 0.11)),
        rgba(9, 12, 27, 0.96);
}

@keyframes themeCoachmarkIn {
    from { opacity: 0; transform: translateY(-8px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes themeTriggerPulse {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-2px); }
}

.theme-lab-trigger-icon {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: conic-gradient(from 25deg, #43d9ff, #9260ff, #ff3ed1, #ffb02e, #c7ff3d, #43d9ff);
    box-shadow: 0 0 14px rgba(67, 217, 255, 0.45);
}

.theme-lab-trigger-count {
    display: grid;
    place-items: center;
    width: 24px;
    height: 24px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    font-size: 11px;
}

.theme-lab-panel {
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 20px;
    background: rgba(7, 13, 25, 0.9);
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.34);
    backdrop-filter: blur(24px) saturate(1.25);
    -webkit-backdrop-filter: blur(24px) saturate(1.25);
}

.theme-lab-panel::before {
    content: "";
    display: block;
    height: 2px;
    background: linear-gradient(90deg, #43d9ff, #9260ff, #ff3ed1, #ffb02e, #c7ff3d);
}

.theme-lab-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 17px 17px 8px;
}

.theme-lab-kicker {
    margin: 0 0 4px !important;
    color: #6d7e94 !important;
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.14em;
}

.theme-lab-head h2 {
    margin: 0;
    color: #f7fbff !important;
    font-size: 17px;
    line-height: 1.35;
}

.theme-lab-close {
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.055);
    color: #b7c4d5;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
}

.theme-lab-close:hover { background: rgba(255, 255, 255, 0.11); color: #fff; }

.theme-lab-intro {
    margin: 0 !important;
    padding: 0 17px 12px;
    color: #8c9bae !important;
    font-size: 11px;
    line-height: 1.55;
}

.theme-lab-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 7px;
    max-height: calc(100vh - 286px);
    overflow: auto;
    padding: 0 11px 11px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.16) transparent;
}

.theme-option {
    position: relative;
    min-width: 0;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 13px;
    background: rgba(255, 255, 255, 0.035);
    color: #f3f7ff;
    text-align: left;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.theme-option:hover {
    transform: translateY(-1px);
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.075);
}

.theme-option[aria-selected="true"] {
    border-color: color-mix(in srgb, var(--option-accent, #43d9ff), transparent 35%);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04), 0 8px 24px rgba(0, 0, 0, 0.16);
}

.theme-option[data-theme="cyan"] { --option-accent: #43d9ff; }
.theme-option[data-theme="mint"] { --option-accent: #2cffc4; }
.theme-option[data-theme="ice"] { --option-accent: #1167ff; }
.theme-option[data-theme="coral"] { --option-accent: #ff7a59; }
.theme-option[data-theme="violet"] { --option-accent: #9260ff; }
.theme-option[data-theme="cobalt"] { --option-accent: #2d5bff; }
.theme-option[data-theme="lime"] { --option-accent: #c7ff3d; }
.theme-option[data-theme="amber"] { --option-accent: #ffb02e; }
.theme-option[data-theme="plasma"] { --option-accent: #ff3ed1; }
.theme-option[data-theme="lunar"] { --option-accent: #f3f7ff; }

.theme-option-palette {
    display: flex;
    align-items: center;
    height: 14px;
    margin-bottom: 8px;
}

.theme-option-palette i {
    display: block;
    width: 16px;
    height: 16px;
    margin-right: -4px;
    border: 2px solid #111827;
    border-radius: 50%;
    background: var(--swatch);
}

.theme-option-copy { display: block; min-width: 0; }

.theme-option-copy strong {
    display: block;
    overflow: hidden;
    color: #f3f7ff;
    font-size: 12px;
    line-height: 1.4;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.theme-option-copy small {
    display: block;
    overflow: hidden;
    margin-top: 2px;
    color: #718198;
    font-size: 9px;
    letter-spacing: 0.04em;
    text-overflow: ellipsis;
    text-transform: uppercase;
    white-space: nowrap;
}

.theme-option em {
    position: absolute;
    top: 9px;
    right: 9px;
    color: rgba(255, 255, 255, 0.25);
    font-size: 9px;
    font-style: normal;
    font-weight: 700;
}

.theme-option[aria-selected="true"] em { color: var(--option-accent); }

.theme-lab-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    min-height: 44px;
    padding: 0 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(0, 0, 0, 0.16);
}

.theme-lab-status span {
    color: #728198;
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.theme-lab-status strong {
    color: #eaf2ff;
    font-size: 11px;
}

@media (max-width: 1024px) {
    .theme-lab { top: 98px; right: 12px; }
}

@media (max-width: 640px) {
    body.theme-demo > .fixed.top-0.left-0.right-0 { padding: 8px 8px 0; }
    body.theme-demo nav { border-radius: 14px !important; }

    .theme-lab {
        top: auto;
        right: 10px;
        bottom: 10px;
        width: min(304px, calc(100vw - 20px));
    }

    .theme-lab-panel { border-radius: 18px; }
    .theme-lab-options { max-height: min(44vh, 360px); }

    .theme-lab-coachmark {
        top: auto;
        right: 0;
        bottom: 58px;
        width: min(304px, calc(100vw - 20px));
        transform-origin: bottom right;
    }

    .theme-lab-coachmark::before {
        top: auto;
        right: 28px;
        bottom: -6px;
        border: 0;
        border-right: 1px solid rgba(146, 96, 255, 0.42);
        border-bottom: 1px solid rgba(146, 96, 255, 0.42);
    }
}

@media (prefers-reduced-motion: reduce) {
    body.theme-demo *,
    body.theme-demo *::before,
    body.theme-demo *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}