:root {
    --color-primary: #2f5d50;
    --color-primary-hover: #254a40;
    --color-primary-light: rgba(47, 93, 80, 0.1);
    --color-secondary: #c96b45;
    --color-secondary-hover: #ae5734;
    --color-secondary-light: rgba(201, 107, 69, 0.12);
    --color-highlight: #dfb66f;
    --color-ink: #1f2b28;

    --bg: #f3ede2;
    --bg-soft: #ede5d7;
    --surface: rgba(255, 250, 242, 0.94);
    --surface-strong: #fffaf2;
    --surface-muted: rgba(255, 247, 236, 0.76);
    --surface-dark: #243531;

    --text: #1e2624;
    --text-secondary: #58645d;
    --text-tertiary: #8a8f84;
    --text-inverse: #f7f0e4;

    --border: rgba(56, 64, 58, 0.12);
    --border-strong: rgba(56, 64, 58, 0.2);
    --border-inverse: rgba(255, 247, 236, 0.18);

    --shadow-xs: 0 2px 8px rgba(44, 50, 45, 0.04), 0 6px 18px rgba(44, 50, 45, 0.06);
    --shadow-sm: 0 4px 12px rgba(44, 50, 45, 0.04), 0 14px 32px rgba(44, 50, 45, 0.08);
    --shadow-md: 0 8px 20px rgba(44, 50, 45, 0.05), 0 24px 50px rgba(44, 50, 45, 0.1);
    --shadow-lg: 0 12px 28px rgba(44, 50, 45, 0.06), 0 38px 80px rgba(44, 50, 45, 0.14);
    --shadow-glow: 0 0 40px rgba(201, 107, 69, 0.12), 0 0 80px rgba(201, 107, 69, 0.06);
    --shadow-card-hover: 0 8px 24px rgba(44, 50, 45, 0.06), 0 32px 64px rgba(44, 50, 45, 0.14), 0 0 0 1px rgba(var(--accent-rgb, 47, 93, 80), 0.06);

    --radius-sm: 12px;
    --radius: 18px;
    --radius-lg: 28px;
    --radius-xl: 36px;
    --radius-full: 999px;

    --transition-fast: 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --transition: 280ms cubic-bezier(0.22, 1, 0.36, 1);
    --transition-slow: 520ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(223, 182, 111, 0.18), transparent 34%),
        radial-gradient(circle at top right, rgba(201, 107, 69, 0.12), transparent 30%),
        linear-gradient(180deg, #f8f2e8 0%, var(--bg) 42%, #efe7da 100%);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0;
    font-family: "Georgia", "Times New Roman", "Noto Serif SC", serif;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

p {
    margin: 0;
}

button,
input,
textarea {
    font: inherit;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ===== UI Upgrade: Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(47, 93, 80, 0.2);
    border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(47, 93, 80, 0.35);
}

/* ===== UI Upgrade: Text Selection ===== */
::selection {
    background: rgba(47, 93, 80, 0.2);
    color: var(--color-ink);
}

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.container {
    width: min(1200px, calc(100% - 32px));
    margin: 0 auto;
}

.section-eyebrow,
.hero-eyebrow,
.console-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-primary);
}

.section-eyebrow::before,
.hero-eyebrow::before,
.console-kicker::before {
    content: "";
    width: 18px;
    height: 1px;
    background: currentColor;
    opacity: 0.45;
}

.hero-header {
    position: relative;
    padding: 28px 0 56px;
    overflow: clip;
}

.hero-backdrop {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(10px);
    animation: floatOrb 14s ease-in-out infinite;
}

.hero-orb.orb-a {
    width: 480px;
    height: 480px;
    top: -140px;
    right: -120px;
    background: radial-gradient(circle, rgba(201, 107, 69, 0.24), transparent 68%);
}

.hero-orb.orb-b {
    width: 520px;
    height: 520px;
    left: -180px;
    bottom: -210px;
    background: radial-gradient(circle, rgba(47, 93, 80, 0.18), transparent 64%);
    animation-delay: -6s;
}

.hero-gridlines {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(47, 93, 80, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(47, 93, 80, 0.05) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 90%);
}

.header-content {
    position: relative;
    width: min(1240px, calc(100% - 32px));
    margin: 0 auto;
}

.header-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.language-switcher,
.theme-switcher,
.announcement-center-btn,
.spring-festival-trigger,
.install-pwa-btn,
.egg-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 42px;
    padding: 0 16px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 250, 242, 0.4);
    background: rgba(36, 53, 49, 0.82);
    color: var(--text-inverse);
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 600;
    backdrop-filter: blur(12px);
    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.language-switcher:hover,
.theme-switcher:hover,
.announcement-center-btn:hover,
.spring-festival-trigger:hover,
.install-pwa-btn:hover,
.egg-button:hover {
    transform: translateY(-2px);
    background: rgba(30, 46, 42, 0.96);
    border-color: rgba(255, 250, 242, 0.58);
    box-shadow: var(--shadow-sm);
}

.announcement-center-btn {
    position: relative;
}

.announcement-center-btn .badge {
    position: absolute;
    top: -6px;
    right: -2px;
    min-width: 18px;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    background: var(--color-secondary);
    color: #fff;
    font-size: 0.68rem;
    font-weight: 700;
}

.hero-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(320px, 460px);
    gap: 28px;
    align-items: stretch;
}

.hero-copy,
.hero-console {
    position: relative;
}

.hero-copy {
    padding: 42px;
    border-radius: var(--radius-xl);
    background:
        linear-gradient(135deg, rgba(255, 252, 246, 0.92), rgba(251, 244, 233, 0.78)),
        rgba(255, 250, 242, 0.88);
    border: 1px solid rgba(255, 250, 242, 0.7);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.hero-copy::before {
    content: "";
    position: absolute;
    inset: auto -40px -70px auto;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(201, 107, 69, 0.18), transparent 70%);
}

.hero-copy h1 {
    margin-top: 14px;
    font-size: clamp(2.8rem, 5vw, 4.8rem);
    color: var(--color-ink);
    background: linear-gradient(135deg, var(--color-ink) 0%, var(--color-primary) 50%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    margin-top: 12px;
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.hero-description {
    max-width: 640px;
    margin-top: 18px;
    font-size: 1rem;
    color: var(--text-secondary);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 26px;
}

.hero-tag {
    padding: 10px 16px;
    border-radius: var(--radius-full);
    background: rgba(47, 93, 80, 0.08);
    border: 1px solid rgba(47, 93, 80, 0.12);
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 700;
    transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
    cursor: default;
}
.hero-tag:hover {
    transform: translateY(-2px);
    background: rgba(47, 93, 80, 0.14);
    box-shadow: var(--shadow-xs);
}

.hero-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 30px;
}

.hero-primary-cta,
.hero-secondary-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 24px;
    border-radius: var(--radius-full);
    font-weight: 700;
    transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.hero-primary-cta {
    background: var(--color-primary);
    color: #fff8f0;
    box-shadow: 0 18px 32px rgba(47, 93, 80, 0.18);
}

.hero-secondary-cta {
    border: 1px solid rgba(47, 93, 80, 0.18);
    background: rgba(255, 250, 242, 0.72);
    color: var(--color-primary);
}

.hero-primary-cta:hover,
.hero-secondary-cta:hover {
    transform: translateY(-2px);
}

.hero-primary-cta:hover {
    background: var(--color-primary-hover);
}

.hero-secondary-cta:hover {
    border-color: rgba(47, 93, 80, 0.34);
    box-shadow: var(--shadow-xs);
}

.hero-console {
    display: flex;
}

.console-panel {
    width: 100%;
    padding: 28px;
    border-radius: var(--radius-xl);
    background:
        linear-gradient(180deg, rgba(36, 53, 49, 0.98), rgba(28, 41, 37, 0.92));
    border: 1px solid rgba(255, 247, 236, 0.12);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 247, 236, 0.06);
    color: var(--text-inverse);
    position: relative;
    overflow: hidden;
}
.console-panel::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 247, 236, 0.15), transparent);
}

.console-heading h2 {
    margin-top: 10px;
    font-size: 1.9rem;
    color: #fff7eb;
}

.console-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 24px;
}

.metric-card {
    padding: 18px 16px;
    border-radius: 24px;
    background: rgba(255, 247, 236, 0.08);
    border: 1px solid rgba(255, 247, 236, 0.1);
    transition: transform var(--transition-fast), background var(--transition-fast);
}
.metric-card:hover {
    transform: translateY(-2px);
    background: rgba(255, 247, 236, 0.12);
}

.metric-value {
    display: block;
    font-family: "Georgia", "Times New Roman", serif;
    font-size: 1.8rem;
    color: #fff9ef;
}

.metric-label {
    display: block;
    margin-top: 6px;
    color: rgba(247, 240, 228, 0.72);
    font-size: 0.86rem;
}

.console-list {
    display: grid;
    gap: 14px;
    margin-top: 24px;
}

.console-item {
    display: grid;
    grid-template-columns: 12px minmax(0, 1fr);
    gap: 14px;
    align-items: flex-start;
    padding: 16px 0;
    border-top: 1px solid rgba(255, 247, 236, 0.1);
}

.console-item strong {
    display: block;
    margin-bottom: 4px;
    font-size: 1rem;
    color: #fff8f0;
}

.console-item p {
    color: rgba(247, 240, 228, 0.72);
    font-size: 0.9rem;
}

.console-dot {
    width: 12px;
    height: 12px;
    margin-top: 5px;
    border-radius: 50%;
    box-shadow: 0 0 0 5px rgba(255, 255, 255, 0.05);
}

.dot-live {
    background: #dfb66f;
}

.dot-ready {
    background: #81a58a;
}

.dot-sync {
    background: #d68866;
}

.page-home {
    padding-bottom: 64px;
}

.feature-band {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 22px;
}

.feature-panel {
    padding: 28px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(255, 250, 242, 0.88), rgba(251, 242, 229, 0.78));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-sm);
}

.feature-panel h2 {
    margin-top: 14px;
    font-size: 1.7rem;
}

.feature-panel p:last-child {
    margin-top: 12px;
    color: var(--text-secondary);
}
.feature-panel {
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.feature-panel:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(47, 93, 80, 0.16);
}

.section-heading {
    max-width: 700px;
    margin-bottom: 28px;
}

.section-heading h2 {
    margin-top: 12px;
    font-size: clamp(2rem, 3vw, 2.8rem);
}

.section-heading p:last-child {
    margin-top: 12px;
    color: var(--text-secondary);
}

.tool-directory {
    margin-top: 34px;
}

.tool-category {
    margin-top: 22px;
    padding: 28px;
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, rgba(255, 251, 244, 0.92), rgba(251, 244, 234, 0.76));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-sm);
}

.category-header {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 16px;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 18px;
    border-bottom: 2px solid;
    border-image: linear-gradient(90deg, rgba(47, 93, 80, 0.2), transparent) 1;
}

.category-icon {
    display: grid;
    place-items: center;
    width: 54px;
    height: 54px;
    border-radius: 18px;
    font-family: "Georgia", "Times New Roman", serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.category-header h3 {
    font-size: 1.55rem;
}

.category-header p {
    margin-top: 4px;
    color: var(--text-secondary);
}

.category-count {
    min-width: 44px;
    padding: 10px 12px;
    border-radius: var(--radius-full);
    background: rgba(36, 53, 49, 0.07);
    color: var(--color-primary);
    text-align: center;
    font-size: 0.92rem;
    font-weight: 700;
}

.category-interactive .category-icon {
    background: rgba(201, 107, 69, 0.12);
    color: var(--color-secondary);
}

.category-teaching .category-icon {
    background: rgba(47, 93, 80, 0.12);
    color: var(--color-primary);
}

.category-subject .category-icon {
    background: rgba(223, 182, 111, 0.18);
    color: #8a6221;
}

.category-system .category-icon {
    background: rgba(31, 43, 40, 0.08);
    color: #495651;
}

.tools-container {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.tool-card {
    --accent: var(--color-primary);
    --accent-soft: rgba(47, 93, 80, 0.08);
    --accent-rgb: 47, 93, 80;

    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 280px;
    padding: 22px;
    border-radius: 30px;
    background:
        linear-gradient(180deg, rgba(255, 252, 246, 0.98), rgba(254, 247, 238, 0.88));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-xs);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
    animation: cardRise 720ms both;
}

.tool-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at top right, rgba(var(--accent-rgb), 0.13), transparent 38%),
        linear-gradient(180deg, transparent, rgba(var(--accent-rgb), 0.03));
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

.tool-card:hover {
    transform: translateY(-8px) scale(1.015);
    border-color: rgba(var(--accent-rgb), 0.28);
    box-shadow: 0 8px 24px rgba(44, 50, 45, 0.06), 0 32px 64px rgba(44, 50, 45, 0.14), 0 0 0 1px rgba(var(--accent-rgb), 0.1);
}

.tool-card:hover::before {
    opacity: 1;
}

/* Shine sweep on hover */
.tool-card::after {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        115deg,
        transparent 40%,
        rgba(255, 255, 255, 0.15) 45%,
        rgba(255, 255, 255, 0.06) 50%,
        transparent 55%
    );
    transform: translateX(-100%) rotate(0deg);
    transition: none;
    pointer-events: none;
}
.tool-card:hover::after {
    animation: cardShine 0.8s ease forwards;
}
@keyframes cardShine {
    to { transform: translateX(40%) rotate(0deg); }
}

.tool-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 14px;
}

.tool-icon {
    display: grid;
    place-items: center;
    width: 64px;
    height: 64px;
    border-radius: 22px;
    background: var(--accent-soft);
    color: var(--accent);
    font-family: "Georgia", "Times New Roman", serif;
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.tool-card:hover .tool-icon {
    transform: translateY(-4px) rotate(-5deg) scale(1.08);
    box-shadow: 0 18px 28px rgba(var(--accent-rgb), 0.2);
    background: rgba(var(--accent-rgb), 0.16);
}

.tool-chip {
    padding: 8px 12px;
    border-radius: var(--radius-full);
    background: rgba(var(--accent-rgb), 0.08);
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.tool-card h2 {
    margin-top: 18px;
    font-size: 1.4rem;
}

.tool-card p {
    margin-top: 12px;
    flex: 1;
    color: var(--text-secondary);
    font-size: 0.94rem;
}

.tool-card button {
    align-self: flex-start;
    min-height: 46px;
    margin-top: 20px;
    padding: 0 18px;
    border: 1px solid rgba(var(--accent-rgb), 0.2);
    border-radius: var(--radius-full);
    background: rgba(255, 250, 242, 0.88);
    color: var(--accent);
    cursor: pointer;
    font-weight: 700;
    transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tool-card button:hover {
    transform: translateY(-2px);
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 8px 20px rgba(var(--accent-rgb), 0.2), 0 16px 32px rgba(var(--accent-rgb), 0.1);
    letter-spacing: 0.02em;
}

#sound-detector-card { --accent: #bf5d2d; --accent-soft: rgba(191, 93, 45, 0.12); --accent-rgb: 191, 93, 45; }
#roll-call-card { --accent: #2f5d50; --accent-soft: rgba(47, 93, 80, 0.1); --accent-rgb: 47, 93, 80; }
#timer-card { --accent: #8c3f35; --accent-soft: rgba(140, 63, 53, 0.12); --accent-rgb: 140, 63, 53; }
#clock-card { --accent: #785d2f; --accent-soft: rgba(120, 93, 47, 0.12); --accent-rgb: 120, 93, 47; }
#grouping-card { --accent: #4d6d44; --accent-soft: rgba(77, 109, 68, 0.12); --accent-rgb: 77, 109, 68; }
#classroom-game-card { --accent: #b35a42; --accent-soft: rgba(179, 90, 66, 0.12); --accent-rgb: 179, 90, 66; }
#whiteboard-card { --accent: #2d6b63; --accent-soft: rgba(45, 107, 99, 0.12); --accent-rgb: 45, 107, 99; }
#tracker-card { --accent: #9a7140; --accent-soft: rgba(154, 113, 64, 0.12); --accent-rgb: 154, 113, 64; }
#copybook-card { --accent: #a44f4f; --accent-soft: rgba(164, 79, 79, 0.12); --accent-rgb: 164, 79, 79; }
#math-card { --accent: #35655d; --accent-soft: rgba(53, 101, 93, 0.12); --accent-rgb: 53, 101, 93; }
#3d-viewer-card { --accent: #7f6445; --accent-soft: rgba(127, 100, 69, 0.12); --accent-rgb: 127, 100, 69; }
#periodic-table-card { --accent: #556b3f; --accent-soft: rgba(85, 107, 63, 0.12); --accent-rgb: 85, 107, 63; }
#chart-generator-card { --accent: #b56b36; --accent-soft: rgba(181, 107, 54, 0.12); --accent-rgb: 181, 107, 54; }
#teacher-camera-card { --accent: #2d6468; --accent-soft: rgba(45, 100, 104, 0.12); --accent-rgb: 45, 100, 104; }
#analytics-card { --accent: #486154; --accent-soft: rgba(72, 97, 84, 0.12); --accent-rgb: 72, 97, 84; }
#website-status-card { --accent: #6a7e49; --accent-soft: rgba(106, 126, 73, 0.12); --accent-rgb: 106, 126, 73; }
#donation-card { --accent: #c96b45; --accent-soft: rgba(201, 107, 69, 0.12); --accent-rgb: 201, 107, 69; }

.tool-card:nth-child(1) { animation-delay: 40ms; }
.tool-card:nth-child(2) { animation-delay: 90ms; }
.tool-card:nth-child(3) { animation-delay: 140ms; }
.tool-card:nth-child(4) { animation-delay: 190ms; }
.tool-card:nth-child(5) { animation-delay: 240ms; }
.tool-card:nth-child(6) { animation-delay: 290ms; }

.workspace-section {
    margin-top: 36px;
}

.workspace-intro {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    padding: 28px;
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, rgba(255, 250, 242, 0.88), rgba(251, 243, 231, 0.78));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-sm);
}

.workspace-intro h2 {
    margin-top: 12px;
    font-size: 2.2rem;
}

.workspace-intro p:last-child {
    margin-top: 10px;
    color: var(--text-secondary);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 20px;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-weight: 700;
    transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

.btn.toggle-students {
    background: var(--color-primary);
    color: #fff8f0;
    box-shadow: 0 16px 28px rgba(47, 93, 80, 0.16);
}

.btn.feedback {
    margin-top: 18px;
    background: var(--color-secondary);
    color: #fff8f0;
    box-shadow: 0 16px 28px rgba(201, 107, 69, 0.16);
}

.instructions {
    margin-top: 36px;
    padding: 32px;
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, rgba(255, 250, 242, 0.9), rgba(251, 243, 231, 0.78));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-sm);
}

.instructions ol {
    margin: 0;
    padding-left: 22px;
}

.instructions li {
    margin-top: 16px;
    color: var(--text-secondary);
    padding-left: 4px;
    line-height: 1.7;
}
.instructions li::marker {
    color: var(--color-secondary);
    font-weight: 700;
}

.instructions strong {
    color: var(--color-primary);
}

footer {
    padding: 40px 16px 54px;
    text-align: center;
    color: var(--text-tertiary);
    border-top: 1px solid;
    border-image: linear-gradient(90deg, transparent, rgba(47, 93, 80, 0.15), transparent) 1;
}

footer p {
    font-size: 0.92rem;
}

.signature-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 14px;
    padding: 11px 20px;
    border-radius: var(--radius-full);
    background: rgba(36, 53, 49, 0.92);
    color: var(--text-inverse);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.signature-badge:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

[data-reveal] {
    opacity: 0;
    transform: translateY(26px);
    transition:
        opacity var(--transition-slow),
        transform var(--transition-slow);
    transition-delay: calc(var(--reveal-order, 0) * 70ms);
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes floatOrb {
    0%,
    100% {
        transform: translate3d(0, 0, 0) scale(1);
    }
    33% {
        transform: translate3d(20px, -16px, 0) scale(1.04);
    }
    66% {
        transform: translate3d(-18px, 18px, 0) scale(0.96);
    }
}

@keyframes cardRise {
    from {
        opacity: 0;
        transform: translateY(22px) scale(0.985);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

body.dark-mode {
    --color-primary: #8eb59c;
    --color-primary-hover: #7fa68d;
    --color-primary-light: rgba(142, 181, 156, 0.14);
    --color-secondary: #d78c63;
    --color-secondary-hover: #c67b51;
    --color-secondary-light: rgba(215, 140, 99, 0.16);
    --color-highlight: #c9a66e;
    --color-ink: #f4ecdf;

    --bg: #161915;
    --bg-soft: #1d231e;
    --surface: rgba(28, 34, 30, 0.92);
    --surface-strong: #202720;
    --surface-muted: rgba(32, 39, 32, 0.8);
    --surface-dark: #131713;

    --text: #eee6d9;
    --text-secondary: #c0b6a9;
    --text-tertiary: #8a8478;
    --text-inverse: #f5ecdf;

    --border: rgba(255, 244, 228, 0.08);
    --border-strong: rgba(255, 244, 228, 0.14);
    --border-inverse: rgba(255, 244, 228, 0.12);

    --shadow-xs: 0 8px 18px rgba(0, 0, 0, 0.22);
    --shadow-sm: 0 18px 32px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 24px 50px rgba(0, 0, 0, 0.28);
    --shadow-lg: 0 34px 70px rgba(0, 0, 0, 0.34);
    --shadow-glow: 0 0 70px rgba(215, 140, 99, 0.09);

    background:
        radial-gradient(circle at top left, rgba(215, 140, 99, 0.12), transparent 30%),
        radial-gradient(circle at top right, rgba(142, 181, 156, 0.08), transparent 25%),
        linear-gradient(180deg, #171b17 0%, #151915 50%, #111411 100%);
}

body.dark-mode .hero-copy,
body.dark-mode .feature-panel,
body.dark-mode .tool-category,
body.dark-mode .workspace-intro,
body.dark-mode .instructions {
    background: linear-gradient(180deg, rgba(31, 37, 33, 0.96), rgba(24, 29, 26, 0.9));
    border-color: rgba(255, 244, 228, 0.06);
}

body.dark-mode .hero-copy h1,
body.dark-mode .feature-panel h2,
body.dark-mode .section-heading h2,
body.dark-mode .workspace-intro h2,
body.dark-mode .tool-card h2,
body.dark-mode .category-header h3,
body.dark-mode .console-heading h2 {
    color: #f6ede0;
}

body.dark-mode .hero-gridlines {
    background-image:
        linear-gradient(rgba(255, 244, 228, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 244, 228, 0.04) 1px, transparent 1px);
}

body.dark-mode .language-switcher,
body.dark-mode .theme-switcher,
body.dark-mode .announcement-center-btn,
body.dark-mode .spring-festival-trigger,
body.dark-mode .install-pwa-btn,
body.dark-mode .egg-button {
    background: rgba(19, 23, 19, 0.8);
    border-color: rgba(255, 244, 228, 0.1);
}

body.dark-mode .tool-card {
    background: linear-gradient(180deg, rgba(34, 40, 36, 0.98), rgba(27, 33, 29, 0.92));
    border-color: rgba(255, 244, 228, 0.06);
}
body.dark-mode .tool-card:hover {
    border-color: rgba(var(--accent-rgb), 0.28);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2), 0 32px 64px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(var(--accent-rgb), 0.12);
}

body.dark-mode .tool-card button,
body.dark-mode .hero-secondary-cta {
    background: rgba(255, 244, 228, 0.02);
}

body.dark-mode .category-count,
body.dark-mode .hero-tag {
    background: rgba(255, 244, 228, 0.06);
}

body.dark-mode .signature-badge {
    background: rgba(245, 236, 223, 0.08);
    border: 1px solid rgba(255, 244, 228, 0.08);
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: rgba(142, 181, 156, 0.2);
}
body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: rgba(142, 181, 156, 0.35);
}

body.dark-mode ::selection {
    background: rgba(142, 181, 156, 0.25);
    color: var(--color-ink);
}

@media (max-width: 1100px) {
    .hero-layout {
        grid-template-columns: 1fr;
    }

    .tools-container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .feature-band {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .hero-header {
        padding-top: 18px;
        padding-bottom: 42px;
    }

    .header-actions {
        justify-content: flex-start;
    }

    .hero-copy,
    .console-panel,
    .tool-category,
    .workspace-intro,
    .instructions {
        padding: 22px;
        border-radius: 24px;
    }

    .hero-copy h1 {
        font-size: 2.35rem;
    }

    .console-metrics {
        grid-template-columns: 1fr;
    }

    .category-header {
        grid-template-columns: 1fr;
    }

    .tools-container {
        grid-template-columns: 1fr;
    }

    .workspace-intro {
        align-items: flex-start;
        flex-direction: column;
    }

    .hero-cta-row {
        flex-direction: column;
    }

    .hero-primary-cta,
    .hero-secondary-cta,
    .btn.toggle-students {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }

    [data-reveal] {
        opacity: 1;
        transform: none;
    }
}