/* ===== CSS Variables ===== */
:root {
    --primary: #3a8678;
    --primary-dark: #2d6a5f;
    --primary-light: #e8f3f0;
    --accent: #c9a96e;
    --gradient: linear-gradient(135deg, #3a8678, #2d6a5f);
    --gradient-warm: linear-gradient(135deg, #c9a96e, #a08456);
    --bg: #fdfcfb;
    --bg-light: #f5f1ec;
    --text: #2a2622;
    --text-light: #6b635c;
    --text-muted: #9a9088;
    --border: #e8e0d8;
    --white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(58, 134, 120, 0.08);
    --shadow: 0 4px 20px rgba(58, 134, 120, 0.1);
    --shadow-lg: 0 12px 40px rgba(58, 134, 120, 0.15);
    --radius: 14px;
    --radius-lg: 22px;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-top: env(safe-area-inset-top, 0px);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: 70px;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    padding-bottom: calc(64px + var(--safe-bottom));
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }

/* ===== Header ===== */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(253, 252, 251, 0.85);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
    padding-top: var(--safe-top);
}
.site-header.scrolled {
    background: rgba(253, 252, 251, 0.95);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 60px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
    width: 38px; height: 38px; border-radius: 10px; overflow: hidden;
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-sm);
}
.logo-icon img { width: 100%; height: 100%; object-fit: cover; }
.logo-text { font-size: 1.2rem; font-weight: 800; color: var(--primary-dark); letter-spacing: 0.02em; }
.main-nav { display: flex; align-items: center; gap: 28px; }
.main-nav a { font-size: 0.95rem; color: var(--text-light); font-weight: 500; transition: color 0.2s; }
.main-nav a:hover { color: var(--primary); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Mobile Menu ===== */
.mobile-menu {
    position: fixed; top: 0; right: -100%; width: 80%; max-width: 320px;
    height: 100vh; background: var(--white); z-index: 999;
    padding: 80px 24px 24px; box-shadow: -4px 0 30px rgba(0,0,0,0.15);
    transition: right 0.3s ease; display: flex; flex-direction: column; gap: 8px;
}
.mobile-menu.open { right: 0; }
.mobile-menu a { padding: 14px 16px; border-radius: 10px; font-size: 1.05rem; color: var(--text); transition: background 0.2s; }
.mobile-menu a:hover { background: var(--primary-light); color: var(--primary-dark); }

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 28px; border-radius: var(--radius); font-size: 1rem;
    font-weight: 600; transition: all 0.2s; cursor: pointer; text-align: center;
}
.btn-primary { background: var(--gradient); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-primary:active { transform: scale(0.97); }
.btn-secondary { background: var(--white); color: var(--primary-dark); border: 2px solid var(--primary); }
.btn-secondary:hover { background: var(--primary-light); }
.btn-secondary:active { transform: scale(0.98); }
.btn-sm { padding: 8px 18px; font-size: 0.9rem; }
.btn-large { padding: 16px 36px; font-size: 1.05rem; }

/* ===== Hero ===== */
.hero {
    padding: 100px 0 50px;
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%);
    position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -50%; right: -20%;
    width: 600px; height: 600px; border-radius: 50%;
    background: radial-gradient(circle, rgba(201, 169, 110, 0.12), transparent 70%);
}
.hero-inner { display: flex; align-items: center; gap: 40px; position: relative; }
.hero-content { flex: 1; }
.hero-badge {
    display: inline-block; padding: 6px 14px; border-radius: 20px;
    background: rgba(58, 134, 120, 0.1); color: var(--primary-dark);
    font-size: 0.85rem; font-weight: 600; margin-bottom: 18px;
}
.hero-title {
    font-size: 2.4rem; font-weight: 800; line-height: 1.25; margin-bottom: 16px;
    color: var(--text); letter-spacing: -0.01em;
}
.hero-subtitle { font-size: 1.1rem; color: var(--text-light); margin-bottom: 24px; line-height: 1.7; }
.hero-keywords { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.hero-keywords span {
    padding: 5px 14px; border-radius: 16px; background: var(--white);
    color: var(--primary-dark); font-size: 0.82rem; font-weight: 500;
    border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.hero-actions { display: flex; gap: 14px; margin-bottom: 32px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 24px; }
.hero-stat { flex: 1; }
.hero-stat-number { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
.hero-stat-label { font-size: 0.78rem; color: var(--text-muted); margin-top: 2px; }
.hero-showcase { flex: 0 0 320px; display: flex; justify-content: center; }
.hero-showcase-img {
    max-width: 220px; border-radius: 18px; box-shadow: var(--shadow-lg);
    border: 4px solid var(--white);
}

/* ===== Section ===== */
.section { padding: 70px 0; }
.section-alt { background: var(--bg-light); }
.section-header { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.section-title {
    font-size: 2rem; font-weight: 800; margin-bottom: 14px;
    color: var(--text); letter-spacing: -0.01em;
}
.section-subtitle { font-size: 1.05rem; color: var(--text-light); }

/* ===== About Content ===== */
.about-content {
    max-width: 820px; margin: 0 auto;
    font-size: 0.98rem; line-height: 1.85; color: var(--text-light);
}
.about-content p { margin-bottom: 16px; }
.about-content p:last-child { margin-bottom: 0; }
.about-content strong { color: var(--primary); font-weight: 700; }

/* ===== CTA Button ===== */
.cta-btn { font-size: 1.15rem; padding: 20px 50px; }

/* ===== Features ===== */
.features-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature-card {
    background: var(--white); border-radius: var(--radius-lg); padding: 32px 24px;
    box-shadow: var(--shadow-sm); transition: all 0.3s; border: 1px solid var(--border);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-card:active { transform: scale(0.98); }
.feature-icon {
    width: 56px; height: 56px; border-radius: 14px; display: flex;
    align-items: center; justify-content: center; font-size: 1.8rem;
    background: var(--primary-light); margin-bottom: 18px;
}
.feature-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.feature-desc { font-size: 0.92rem; color: var(--text-light); line-height: 1.7; }

/* ===== Characters ===== */
.characters-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
}
.character-card {
    background: var(--white); border-radius: var(--radius-lg); padding: 24px 16px;
    text-align: center; box-shadow: var(--shadow-sm); transition: all 0.3s;
    border: 1px solid var(--border);
}
.character-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.character-card:active { transform: scale(0.98); }
.character-avatar {
    width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; font-weight: 700; color: #fff;
    background: var(--gradient);
}
.character-name { font-size: 1rem; font-weight: 700; margin-bottom: 4px; color: var(--text); }
.character-type { font-size: 0.82rem; color: var(--accent); font-weight: 500; }
.character-desc { font-size: 0.78rem; color: var(--text-light); line-height: 1.6; margin-top: 8px; }

/* ===== Scenarios ===== */
.scenarios-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.scenario-card {
    background: var(--white); border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow-sm); transition: all 0.3s; border: 1px solid var(--border);
}
.scenario-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.scenario-card:active { transform: scale(0.98); }
.scenario-banner {
    height: 140px; display: flex; align-items: center; justify-content: center;
}
.scenario-emoji { font-size: 2.5rem; }
.scenario-card .scenario-title { padding: 18px 20px 6px; font-size: 1.1rem; font-weight: 700; color: var(--text); }
.scenario-card .scenario-desc { padding: 0 20px 20px; font-size: 0.9rem; color: var(--text-light); line-height: 1.7; }

/* ===== Tutorial ===== */
.tutorial-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.tutorial-step {
    text-align: center; padding: 28px 18px; background: var(--white);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); border: 1px solid var(--border);
}
.tutorial-number {
    width: 48px; height: 48px; border-radius: 50%; margin: 0 auto 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; font-weight: 800; color: #fff; background: var(--gradient);
}
.tutorial-step-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.tutorial-step p { font-size: 0.88rem; color: var(--text-light); line-height: 1.7; }
.tutorial-showcase {
    margin-top: 36px; text-align: center;
}
.tutorial-showcase img {
    max-height: 480px; margin: 0 auto; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg); border: 4px solid var(--white);
}
.character-screenshot-caption { margin-top: 12px; font-size: 0.9rem; color: var(--text-muted); }

/* ===== Comparison ===== */
.comparison-table {
    max-width: 760px; margin: 0 auto; background: var(--white);
    border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow);
}
.comparison-row { display: grid; grid-template-columns: 1fr 1.2fr 1fr; }
.comparison-row:not(:last-child) { border-bottom: 1px solid var(--border); }
.comparison-cell { padding: 16px 18px; font-size: 0.92rem; color: var(--text-light); display: flex; align-items: center; }
.comparison-cell.comparison-highlight { color: var(--primary-dark); font-weight: 600; background: var(--primary-light); }
.comparison-header-row .comparison-cell { font-weight: 700; color: var(--text); font-size: 0.95rem; }
.comparison-header-row .comparison-cell.comparison-highlight { color: var(--primary-dark); }

/* ===== Reviews ===== */
.reviews-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.review-card {
    background: var(--white); border-radius: var(--radius-lg); padding: 28px 24px;
    box-shadow: var(--shadow-sm); border: 1px solid var(--border); transition: all 0.3s;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.review-stars { color: var(--accent); font-size: 1.1rem; margin-bottom: 14px; }
.review-text { font-size: 0.95rem; color: var(--text-light); line-height: 1.8; margin-bottom: 18px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; font-size: 0.88rem; font-weight: 600; color: var(--text); }
.review-avatar {
    width: 36px; height: 36px; border-radius: 50%; display: flex;
    align-items: center; justify-content: center; color: #fff; font-size: 0.95rem;
    background: var(--gradient);
}

/* ===== Download ===== */
.download-card {
    max-width: 460px; margin: 0 auto; background: var(--white);
    border-radius: var(--radius-lg); padding: 36px 32px; text-align: center;
    box-shadow: var(--shadow-lg); border: 1px solid var(--border);
}
.download-hero { display: flex; align-items: center; gap: 16px; justify-content: center; margin-bottom: 8px; }
.download-logo { width: 48px !important; height: 48px !important; }
.version-info { font-size: 0.88rem; color: var(--text-muted); }
.download-features {
    display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin: 18px 0 24px;
}
.download-feature {
    padding: 5px 14px; border-radius: 16px; background: var(--primary-light);
    color: var(--primary-dark); font-size: 0.82rem; font-weight: 500;
}
.download-card .btn { width: 100%; margin-bottom: 12px; }
.download-note { font-size: 0.82rem; color: var(--text-muted); }
.testimonial-stars { color: var(--accent); font-size: 1.1rem; }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question {
    width: 100%; padding: 20px 0; display: flex; align-items: center;
    justify-content: space-between; font-size: 1.02rem; font-weight: 600;
    color: var(--text); text-align: left;
}
.faq-question span:first-child { flex: 1; padding-right: 16px; }
.faq-icon { font-size: 1.4rem; color: var(--primary); transition: transform 0.3s; flex-shrink: 0; }
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-item.active .faq-answer { max-height: 800px; }
.faq-answer-inner { padding: 0 0 20px; font-size: 0.92rem; color: var(--text-light); line-height: 1.8; }

/* ===== Keywords Cloud ===== */
.keywords-cloud {
    display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; max-width: 820px; margin: 0 auto;
}
.keywords-cloud a {
    padding: 8px 16px; border-radius: 20px; background: var(--white);
    color: var(--text-light); font-size: 0.88rem; border: 1px solid var(--border);
    transition: all 0.2s; box-shadow: var(--shadow-sm);
}
.keywords-cloud a:hover { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary); }

/* ===== CTA Section ===== */
.cta-section {
    background: var(--gradient); text-align: center; color: #fff;
}
.cta-title { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.cta-subtitle { font-size: 1.1rem; margin-bottom: 28px; opacity: 0.95; }
.cta-section .cta-btn {
    background: #fff; color: var(--primary-dark);
}
.cta-section .cta-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.2); }

/* ===== Footer ===== */
.site-footer { background: #2a2622; color: #c4bab0; padding: 50px 0 0; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 36px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-logo .logo-text { color: #fff; }
.footer-desc { font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
.footer-title { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 14px; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { font-size: 0.9rem; color: #c4bab0; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid #3d3833; padding: 18px 0; text-align: center; }
.footer-bottom p { font-size: 0.82rem; color: #8a8078; }

/* ===== Mobile Nav ===== */
.mobile-nav {
    display: none; position: fixed; bottom: 0; left: 0; right: 0;
    background: var(--white); box-shadow: 0 -2px 20px rgba(0,0,0,0.08);
    z-index: 998; padding: 8px 0; padding-bottom: calc(8px + var(--safe-bottom));
}
.mobile-nav-item {
    flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
    padding: 6px 4px; font-size: 0.7rem; color: var(--text-muted); transition: color 0.2s;
}
.mobile-nav-item.active { color: var(--primary); }
.mobile-nav-icon, .mobile-nav-item > :first-child { font-size: 1.2rem; }
.mobile-nav-download {
    background: var(--gradient); color: #fff; border-radius: 14px; padding: 8px 14px;
    flex: 0 0 auto; min-width: 64px;
}
.mobile-nav-download.active { color: #fff; }

/* ===== FAB ===== */
.fab-download {
    display: flex; position: fixed; bottom: 80px; right: 16px;
    width: 52px; height: 52px; border-radius: 50%; background: var(--gradient);
    color: #fff; align-items: center; justify-content: center; font-size: 1.4rem;
    box-shadow: var(--shadow-lg); z-index: 997; transition: transform 0.2s;
}
.fab-download:active { transform: scale(0.92); }

/* ===== Animation ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.hero-content > * { animation: fadeInUp 0.6s ease backwards; }
.hero-badge { animation-delay: 0.1s; }
.hero-title { animation-delay: 0.2s; }
.hero-subtitle { animation-delay: 0.3s; }
.hero-keywords { animation-delay: 0.4s; }
.hero-actions { animation-delay: 0.5s; }
.hero-stats { animation-delay: 0.6s; }

/* ===== Touch Optimization ===== */
a, button, .faq-question, .review-card, .feature-card, .character-card, .scenario-card {
    -webkit-tap-highlight-color: transparent;
}

section[id], .section[id], .download-section[id] {
    scroll-margin-top: 60px;
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 1024px) {
    .main-nav { gap: 18px; }
    .main-nav a:not(.btn) { font-size: 0.88rem; }
    .hero-title { font-size: 2rem; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .characters-grid { grid-template-columns: repeat(4, 1fr); }
    .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
    body { padding-bottom: calc(64px + var(--safe-bottom)); }
    .container { padding: 0 16px; }

    /* Header */
    .main-nav { display: none; }
    .nav-toggle { display: flex; }
    .header-inner { height: 56px; }
    .logo-icon { width: 34px; height: 34px; }
    .logo-text { font-size: 1.1rem; }

    /* Mobile Nav */
    .mobile-nav { display: flex; justify-content: space-around; align-items: center; }

    /* Hero */
    .hero { padding: 90px 0 40px; }
    .hero-inner { flex-direction: column; gap: 30px; text-align: center; }
    .hero-content { order: 2; }
    .hero-showcase { order: 1; flex: none; }
    .hero-showcase-img { max-width: 220px; }
    .hero-title { font-size: 1.65rem; }
    .hero-subtitle { font-size: 0.98rem; }
    .hero-keywords { justify-content: center; }
    .hero-keywords span { font-size: 0.76rem; padding: 4px 12px; }
    .hero-actions { justify-content: center; }
    .hero-stats { gap: 14px; flex-wrap: wrap; justify-content: center; }
    .hero-stat { flex: 1 1 40%; min-width: 120px; }
    .hero-stat-number { font-size: 1.3rem; }
    .hero-stat-label { font-size: 0.72rem; }
    .hero-badge { font-size: 0.78rem; }

    /* Section */
    .section { padding: 50px 0; }
    .section-header { margin-bottom: 32px; }
    .section-title { font-size: 1.5rem; }
    .section-subtitle { font-size: 0.95rem; }

    /* About Content */
    .about-content { font-size: 0.92rem; line-height: 1.8; }
    .about-content p { margin-bottom: 14px; }

    /* CTA Button */
    .cta-btn { font-size: 1rem; padding: 16px 32px; }

    /* Features */
    .features-grid { grid-template-columns: 1fr; gap: 16px; }
    .feature-card { padding: 24px 20px; }
    .feature-icon { width: 48px; height: 48px; font-size: 1.6rem; }
    .feature-title { font-size: 1.08rem; }

    /* Characters */
    .characters-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .character-card { padding: 20px 12px; }
    .character-avatar { width: 56px; height: 56px; font-size: 1.3rem; }
    .character-name { font-size: 0.95rem; }
    .character-desc { font-size: 0.74rem; line-height: 1.55; margin-top: 6px; }

    /* Scenarios */
    .scenarios-grid { grid-template-columns: 1fr; gap: 16px; }
    .scenario-banner { height: 130px; }
    .scenario-emoji { font-size: 2.2rem; }

    /* Tutorial */
    .tutorial-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .tutorial-step { padding: 22px 14px; }
    .tutorial-showcase img { max-height: 380px; }
    .tutorial-showcase { margin-top: 28px; }

    /* Comparison */
    .comparison-cell { padding: 12px 10px; font-size: 0.82rem; }
    .comparison-header-row .comparison-cell { font-size: 0.85rem; }

    /* Reviews */
    .reviews-grid { grid-template-columns: 1fr; gap: 16px; }
    .review-card { padding: 22px 18px; }

    /* Download */
    .download-card { margin: 0 12px; padding: 28px 22px; }

    /* FAQ */
    .faq-question { font-size: 0.95rem; padding: 16px 0; }
    .faq-answer-inner { font-size: 0.86rem; padding: 0 0 16px; line-height: 1.75; }

    /* Keywords */
    .keywords-cloud { gap: 8px; }
    .keywords-cloud a { font-size: 0.82rem; padding: 6px 12px; }

    /* CTA */
    .cta-section { padding: 50px 0; }
    .cta-title { font-size: 1.5rem; }
    .cta-subtitle { font-size: 0.98rem; }

    /* Footer */
    .footer-inner { grid-template-columns: 1fr; gap: 28px; text-align: center; }
    .footer-logo { justify-content: center; }
    .footer-desc { margin: 0 auto; }

    /* Buttons */
    .btn { padding: 14px 24px; font-size: 0.95rem; min-height: 44px; }
    .btn-large { padding: 16px 28px; font-size: 1rem; }

    /* FAB */
    .fab-download { bottom: 76px; width: 48px; height: 48px; font-size: 1.2rem; }
}

/* ===== Responsive: Small Mobile ===== */
@media (max-width: 375px) {
    .characters-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .character-avatar { width: 56px; height: 56px; font-size: 1.2rem; }
    .character-card { padding: 18px 12px; }
    .character-desc { font-size: 0.7rem; line-height: 1.5; }

    .mobile-nav-item { font-size: 0.66rem; padding: 4px 4px; }
    .mobile-nav-item > :first-child { font-size: 1.05rem; }
    .mobile-nav-download { padding: 4px 8px; }

    .hero-title { font-size: 1.4rem; }
    .hero-keywords { gap: 4px; }
    .hero-keywords span { font-size: 0.72rem; padding: 3px 10px; }
    .hero-showcase-img { max-width: 180px; }

    .container { padding: 0 14px; }
    .section-title { font-size: 1.25rem; }
    .scenario-banner { height: 150px; }

    .about-content { font-size: 0.88rem; line-height: 1.75; }
    .cta-btn { padding: 14px 24px; font-size: 0.95rem; }
    .hero-stat { min-width: 100px; }
    .tutorial-grid { grid-template-columns: 1fr; }
}

/* ===== Dark Mode ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1a1714;
        --bg-light: #221e1a;
        --text: #e8e0d8;
        --text-light: #b8aea4;
        --text-muted: #8a8078;
        --border: #3d3833;
        --white: #2a2622;
        --primary-light: rgba(58, 134, 120, 0.15);
    }
    .site-header { background: rgba(26, 23, 20, 0.85); }
    .site-header.scrolled { background: rgba(26, 23, 20, 0.95); }
    .hero { background: linear-gradient(180deg, rgba(58, 134, 120, 0.1) 0%, var(--bg) 100%); }
    .mobile-menu { background: var(--bg); }
    .mobile-nav { background: var(--bg); }
}