/* ============================================================
   杨赛文讲师主页 · 设计系统
   主题：深藏青 × 暖金 · 高端商务培训
   ============================================================ */

:root {
    /* 主色：深藏青 */
    --navy-950: #0A1830;
    --navy-900: #10203F;
    --navy-800: #16294D;
    --navy-700: #1F3661;

    /* 点缀：暖金 */
    --gold: #C6A15B;
    --gold-deep: #A9853F;
    --gold-tint: rgba(198, 161, 91, 0.12);

    /* 文字与底色 */
    --ink: #14213D;
    --text: #3A4A63;
    --muted: #71809B;
    --paper: #F6F7F9;
    --card: #FFFFFF;
    --line: #E6EAF1;

    --radius: 14px;
    --radius-sm: 10px;
    --shadow-sm: 0 2px 10px rgba(16, 32, 63, 0.06);
    --shadow-md: 0 10px 30px rgba(16, 32, 63, 0.10);
    --shadow-lg: 0 24px 60px rgba(16, 32, 63, 0.16);
    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

    --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", -apple-system, sans-serif;
    --font-serif: Georgia, "Times New Roman", "Songti SC", serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 84px; }

body {
    font-family: var(--font-sans);
    line-height: 1.7;
    color: var(--text);
    background-color: var(--card);
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }

.container { width: min(92%, 1180px); margin: 0 auto; }

/* 进入视口淡入 */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in-view { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; transition: none; }
    * { animation: none !important; }
}

/* ============================================================
   通用按钮
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 13px 28px;
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid transparent;
    transition: all 0.3s var(--ease);
}

.btn-gold {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-deep) 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(198, 161, 91, 0.35);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(198, 161, 91, 0.45); }

.btn-ghost {
    border-color: rgba(255, 255, 255, 0.45);
    color: rgba(255, 255, 255, 0.92);
}
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, 0.08); }

.btn-navy-outline {
    border-color: var(--navy-800);
    color: var(--navy-800);
}
.btn-navy-outline:hover { background: var(--navy-800); color: #fff; }

/* ============================================================
   导航栏
   ============================================================ */
.navbar {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.nav-container { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.logo { display: flex; align-items: baseline; gap: 10px; }
.logo-name { font-size: 1.35rem; font-weight: 800; letter-spacing: 0.04em; color: #fff; transition: color 0.3s; }
.logo-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--gold); align-self: center; }
.logo-sub { font-size: 0.82rem; letter-spacing: 0.08em; color: rgba(255, 255, 255, 0.66); transition: color 0.3s; }

.nav-links { display: flex; gap: 34px; }
.nav-links a {
    font-size: 0.98rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.88);
    position: relative;
    padding: 6px 0;
    transition: color 0.3s;
}
.nav-links a::after {
    content: '';
    position: absolute;
    left: 0; bottom: 0;
    width: 0; height: 2px;
    background: var(--gold);
    transition: width 0.3s var(--ease);
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }

.navbar.scrolled,
.navbar.solid {
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--line), var(--shadow-sm);
}
.navbar.scrolled .logo-name, .navbar.solid .logo-name { color: var(--navy-900); }
.navbar.scrolled .logo-sub, .navbar.solid .logo-sub { color: var(--muted); }
.navbar.scrolled .nav-links a, .navbar.solid .nav-links a { color: var(--text); }
.navbar.scrolled .nav-links a:hover, .navbar.solid .nav-links a:hover { color: var(--navy-900); }

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.35rem;
    color: #fff;
    cursor: pointer;
    padding: 8px;
}
.navbar.scrolled .menu-toggle, .navbar.solid .menu-toggle { color: var(--navy-900); }

/* ============================================================
   首屏
   ============================================================ */
.hero {
    position: relative;
    background:
        radial-gradient(ellipse 900px 520px at 12% 110%, rgba(198, 161, 91, 0.14) 0%, transparent 55%),
        radial-gradient(ellipse 800px 500px at 92% -10%, rgba(59, 108, 190, 0.22) 0%, transparent 55%),
        linear-gradient(160deg, var(--navy-950) 0%, var(--navy-900) 55%, var(--navy-800) 100%);
    color: #fff;
    padding: 168px 0 150px;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 30%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 30%, transparent 100%);
}

.hero-grid {
    position: relative;
    display: grid;
    grid-template-columns: 1.25fr 1fr;
    gap: 72px;
    align-items: center;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.88rem;
    letter-spacing: 0.22em;
    color: var(--gold);
    border: 1px solid rgba(198, 161, 91, 0.4);
    border-radius: 999px;
    padding: 7px 18px;
    margin-bottom: 26px;
    animation: fadeUp 0.7s var(--ease) both;
}

.hero-name {
    font-size: clamp(3rem, 6vw, 4.6rem);
    font-weight: 800;
    letter-spacing: 0.06em;
    line-height: 1.15;
    animation: fadeUp 0.7s var(--ease) 0.08s both;
}

.hero-title {
    font-size: clamp(1.3rem, 2.4vw, 1.7rem);
    font-weight: 500;
    color: var(--gold);
    letter-spacing: 0.14em;
    margin: 14px 0 22px;
    animation: fadeUp 0.7s var(--ease) 0.16s both;
}

.hero-intro {
    font-size: 1.08rem;
    color: rgba(255, 255, 255, 0.78);
    max-width: 520px;
    margin-bottom: 38px;
    animation: fadeUp 0.7s var(--ease) 0.24s both;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; animation: fadeUp 0.7s var(--ease) 0.32s both; }

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(26px); }
    to { opacity: 1; transform: none; }
}

.hero-photo-wrap { position: relative; justify-self: center; animation: fadeUp 0.8s var(--ease) 0.2s both; }

.hero-photo-frame {
    position: relative;
    border-radius: var(--radius);
    padding: 0;
}
.hero-photo-frame::before {
    content: '';
    position: absolute;
    inset: 18px -18px -18px 18px;
    border: 1.5px solid rgba(198, 161, 91, 0.55);
    border-radius: var(--radius);
}
.hero-photo {
    position: relative;
    width: min(340px, 72vw);
    aspect-ratio: 4 / 5;
    object-fit: cover;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.hero-badge {
    position: absolute;
    left: -46px;
    bottom: 34px;
    background: rgba(255, 255, 255, 0.97);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    padding: 14px 20px;
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}
.hero-badge-number { font-family: var(--font-serif); font-size: 1.7rem; font-weight: 700; color: var(--navy-900); }
.hero-badge-text { font-size: 0.82rem; color: var(--muted); }

/* ============================================================
   数字带
   ============================================================ */
.stats-wrap { margin-top: -76px; position: relative; z-index: 5; }

.stats-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    padding: 34px 20px;
}

.stat { text-align: center; padding: 6px 12px; position: relative; }
.stat + .stat::before {
    content: '';
    position: absolute;
    left: 0; top: 50%;
    transform: translateY(-50%);
    height: 46px; width: 1px;
    background: var(--line);
}

.stat-number { font-family: var(--font-serif); font-size: 2.6rem; font-weight: 700; color: var(--navy-900); line-height: 1.1; }
.stat-suffix { font-size: 1.4rem; color: var(--gold-deep); margin-left: 3px; }
.stat-label { font-size: 0.92rem; color: var(--muted); margin-top: 6px; letter-spacing: 0.05em; }

/* ============================================================
   通用区块
   ============================================================ */
.section { padding: 104px 0; }
.section-tint { background: var(--paper); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }

.section-eyebrow {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    color: var(--gold-deep);
    margin-bottom: 12px;
}
.section-eyebrow::after {
    content: '';
    display: block;
    width: 34px; height: 2px;
    background: var(--gold);
    margin: 10px auto 0;
}

.section-heading { font-size: clamp(1.7rem, 3.4vw, 2.3rem); color: var(--ink); font-weight: 800; letter-spacing: 0.03em; }
.section-lede { color: var(--muted); font-size: 1.05rem; margin-top: 14px; }

/* ============================================================
   关于讲师
   ============================================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 56px;
    align-items: start;
}

.about-para { font-size: 1.05rem; margin-bottom: 18px; }

.about-subhead {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.15rem;
    color: var(--navy-900);
    margin: 30px 0 16px;
}
.about-subhead i { color: var(--gold-deep); font-size: 1rem; }

.credentials li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 11px 0;
    border-bottom: 1px dashed var(--line);
    color: var(--ink);
    font-size: 1.02rem;
}
.credentials li:last-child { border-bottom: none; }
.credentials i { color: var(--gold); margin-top: 6px; font-size: 0.95rem; }

.about-quote-card {
    position: sticky;
    top: 100px;
    background:
        radial-gradient(ellipse 320px 200px at 85% -10%, rgba(198, 161, 91, 0.25) 0%, transparent 60%),
        linear-gradient(150deg, var(--navy-900), var(--navy-800));
    color: #fff;
    border-radius: var(--radius);
    padding: 44px 38px;
    box-shadow: var(--shadow-md);
}
.quote-mark { font-size: 1.8rem; color: var(--gold); opacity: 0.85; }
.quote-text {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    line-height: 1.5;
    margin: 18px 0 22px;
}
.quote-by { color: rgba(255, 255, 255, 0.62); font-size: 0.95rem; letter-spacing: 0.1em; }

/* ============================================================
   课程筛选
   ============================================================ */
.filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 54px;
}

.filter-btn {
    --cat-color: var(--navy-800);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border: 1.5px solid var(--line);
    background: var(--card);
    color: var(--text);
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.28s var(--ease);
}
.filter-count {
    font-size: 0.78rem;
    background: var(--paper);
    color: var(--muted);
    border-radius: 999px;
    padding: 1px 8px;
    transition: all 0.28s var(--ease);
}
.filter-btn:hover { border-color: var(--cat-color); color: var(--cat-color); transform: translateY(-1px); }
.filter-btn.active {
    background: var(--cat-color);
    border-color: var(--cat-color);
    color: #fff;
    box-shadow: 0 6px 16px rgba(16, 32, 63, 0.18);
}
.filter-btn.active .filter-count { background: rgba(255, 255, 255, 0.22); color: #fff; }

/* ============================================================
   课程分类块
   ============================================================ */
.category-block { margin-bottom: 66px; }
.category-block:last-child { margin-bottom: 0; }

/* ============================================================
   核心课程区块
   ============================================================ */
.core-block { margin-bottom: 72px; }

.core-chip {
    color: #B45309;
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
}

.core-count {
    color: #B45309;
    background: #FEF3C7;
}

.card-core { border-color: #FDE68A; background: linear-gradient(180deg, #FFFDF5 0%, var(--card) 42%); }
.card-core::before { transform: scaleX(1); }

.card-top-right { display: flex; align-items: center; gap: 8px; }

.core-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: #fff;
    background: linear-gradient(135deg, #F59E0B, #D97706);
    border-radius: 999px;
    padding: 4px 10px;
    white-space: nowrap;
}
.core-badge i { font-size: 0.7rem; }

.other-head { margin-top: 10px; }

.category-head {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-bottom: 16px;
    margin-bottom: 26px;
    border-bottom: 1px solid var(--line);
}

.category-chip {
    width: 46px; height: 46px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-size: 1.15rem;
    color: var(--cat-color);
    background: color-mix(in srgb, var(--cat-color) 12%, #fff);
}

.category-title h3 { font-size: 1.3rem; color: var(--ink); letter-spacing: 0.03em; }
.category-title p { font-size: 0.88rem; color: var(--muted); }

.category-count {
    margin-left: auto;
    font-size: 0.88rem;
    color: var(--cat-color);
    background: color-mix(in srgb, var(--cat-color) 10%, #fff);
    padding: 5px 14px;
    border-radius: 999px;
    font-weight: 600;
    white-space: nowrap;
}

/* ============================================================
   课程卡片
   ============================================================ */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.card {
    position: relative;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px 26px 24px;
    display: flex;
    flex-direction: column;
    transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease), border-color 0.32s var(--ease);
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 4px;
    background: var(--cat-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.36s var(--ease);
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); border-color: transparent; }
.card:hover::before { transform: scaleX(1); }

.card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }

.card-icon {
    width: 52px; height: 52px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    font-size: 1.3rem;
    color: var(--cat-color);
    background: color-mix(in srgb, var(--cat-color) 11%, #fff);
    transition: transform 0.32s var(--ease);
}
.card:hover .card-icon { transform: scale(1.08) rotate(-4deg); }

.card-code {
    font-family: var(--font-serif);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--cat-color);
    background: color-mix(in srgb, var(--cat-color) 9%, #fff);
    border-radius: 7px;
    padding: 4px 11px;
}

.card-title { font-size: 1.22rem; color: var(--ink); font-weight: 700; line-height: 1.4; }
.card-subtitle { font-size: 0.85rem; color: var(--muted); margin: 4px 0 12px; letter-spacing: 0.04em; }
.card-desc { font-size: 0.98rem; color: var(--text); margin-bottom: 16px; flex-grow: 1; }

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    padding-top: 14px;
    border-top: 1px dashed var(--line);
    margin-bottom: 18px;
}
.card-meta span { display: inline-flex; align-items: center; gap: 7px; font-size: 0.84rem; color: var(--muted); }
.card-meta i { color: var(--gold-deep); font-size: 0.8rem; }

.card-actions { display: flex; gap: 10px; }

.btn-card {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 11px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.93rem;
    font-weight: 600;
    transition: all 0.28s var(--ease);
    white-space: nowrap;
}
.btn-card i { font-size: 0.8rem; }

.btn-outline { border: 1.5px solid var(--line); color: var(--navy-800); background: var(--card); }
.btn-outline:hover { border-color: var(--navy-800); background: var(--paper); }

.btn-solid { background: var(--navy-800); color: #fff; border: 1.5px solid var(--navy-800); }
.btn-solid:hover { background: var(--navy-700); border-color: var(--navy-700); box-shadow: 0 6px 16px rgba(16, 32, 63, 0.25); }
.btn-solid.disabled { background: var(--line); border-color: var(--line); color: var(--muted); cursor: not-allowed; }
.btn-solid.disabled:hover { box-shadow: none; background: var(--line); border-color: var(--line); }

/* ============================================================
   在线应用
   ============================================================ */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 18px;
}

.app-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 20px 22px;
    transition: all 0.3s var(--ease);
}
.app-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(198, 161, 91, 0.5); }

.app-icon {
    width: 46px; height: 46px;
    flex-shrink: 0;
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-size: 1.1rem;
    color: var(--gold-deep);
    background: var(--gold-tint);
    transition: all 0.3s var(--ease);
}
.app-card:hover .app-icon { background: linear-gradient(135deg, var(--gold), var(--gold-deep)); color: #fff; }

.app-text h4 { font-size: 1.05rem; color: var(--ink); }
.app-text p { font-size: 0.85rem; color: var(--muted); }

.app-arrow { margin-left: auto; color: var(--line); font-size: 0.9rem; transition: all 0.3s var(--ease); }
.app-card:hover .app-arrow { color: var(--gold-deep); transform: translateX(4px); }

/* ============================================================
   服务客户
   ============================================================ */
.clients-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.client-panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px 26px;
}

.client-panel-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}
.client-panel-head i {
    width: 38px; height: 38px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    font-size: 0.95rem;
    color: var(--navy-800);
    background: var(--paper);
}
.client-panel-head h4 { font-size: 1.05rem; color: var(--ink); }
.client-panel-head span { margin-left: auto; font-size: 0.82rem; color: var(--muted); }

.client-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
    padding: 6px 14px;
    background: var(--paper);
    border-radius: 999px;
    color: var(--text);
    font-size: 0.86rem;
    transition: all 0.25s var(--ease);
    cursor: default;
}
.tag:hover { background: var(--gold-tint); color: var(--gold-deep); }

.clients-note { text-align: center; color: var(--muted); font-size: 0.88rem; margin-top: 30px; }

/* ============================================================
   页脚
   ============================================================ */
.footer {
    background: var(--navy-950);
    color: rgba(255, 255, 255, 0.75);
    padding: 54px 0 40px;
}

.footer-inner { text-align: center; }

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}
.footer-name { font-size: 1.15rem; font-weight: 700; color: #fff; letter-spacing: 0.05em; }
.footer-rule { width: 1px; height: 16px; background: rgba(255, 255, 255, 0.25); }
.footer-slogan { font-size: 0.92rem; color: rgba(255, 255, 255, 0.55); }

.footer-copyright {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    padding-top: 22px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    width: min(100%, 560px);
    margin: 0 auto;
}

/* ============================================================
   课程详情页
   ============================================================ */
.course-hero {
    --cat-color: #3B82F6;
    position: relative;
    background:
        radial-gradient(ellipse 700px 420px at 88% -20%, color-mix(in srgb, var(--cat-color) 30%, transparent) 0%, transparent 60%),
        linear-gradient(155deg, var(--navy-950) 0%, var(--navy-900) 60%, var(--navy-800) 100%);
    color: #fff;
    padding: 140px 0 70px;
}

.crumb {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.92rem;
    margin-bottom: 34px;
    transition: all 0.25s var(--ease);
}
.crumb:hover { color: #fff; transform: translateX(-3px); }

.course-hero-main { display: flex; gap: 26px; align-items: flex-start; }

.course-hero-icon {
    flex-shrink: 0;
    width: 72px; height: 72px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    font-size: 1.8rem;
    color: #fff;
    background: color-mix(in srgb, var(--cat-color) 55%, transparent);
    border: 1px solid color-mix(in srgb, var(--cat-color) 75%, #fff 10%);
}

.course-hero-chips { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.chip { font-size: 0.82rem; padding: 5px 14px; border-radius: 999px; letter-spacing: 0.04em; }
.chip-cat { background: var(--cat-color); color: #fff; font-weight: 600; }
.chip-sub { border: 1px solid rgba(255, 255, 255, 0.35); color: rgba(255, 255, 255, 0.85); }

.course-hero h1 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); font-weight: 800; letter-spacing: 0.03em; line-height: 1.3; }
.course-tagline { color: rgba(255, 255, 255, 0.75); font-size: 1.08rem; margin-top: 12px; max-width: 640px; }

.course-body { padding: 64px 0 96px; background: var(--paper); }
.course-container { max-width: 880px; }

.meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 16px;
    margin-bottom: 54px;
}

.meta-item {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 20px 18px;
    text-align: center;
    transition: all 0.3s var(--ease);
}
.meta-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.meta-item i { font-size: 1.25rem; color: var(--gold-deep); margin-bottom: 10px; }
.meta-label { display: block; font-size: 0.82rem; color: var(--muted); margin-bottom: 4px; }
.meta-value { display: block; font-size: 0.98rem; font-weight: 600; color: var(--ink); line-height: 1.5; }

.course-block { margin-bottom: 48px; }

.block-head {
    display: flex;
    align-items: center;
    gap: 13px;
    font-size: 1.35rem;
    color: var(--ink);
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: 0.03em;
}
.block-marker { width: 5px; height: 24px; border-radius: 3px; background: linear-gradient(var(--gold), var(--gold-deep)); }

.block-para {
    font-size: 1.04rem;
    margin-bottom: 14px;
    line-height: 1.9;
    text-align: justify;
}

.sandbox-panel {
    --cat-color: #3B82F6;
    position: relative;
    background: var(--card);
    border: 1px solid color-mix(in srgb, var(--cat-color) 30%, var(--line));
    border-left: 5px solid var(--cat-color);
    border-radius: var(--radius-sm);
    padding: 26px 28px 26px 62px;
    box-shadow: var(--shadow-sm);
}
.sandbox-icon {
    position: absolute;
    left: 22px; top: 30px;
    color: var(--cat-color);
    font-size: 1.2rem;
}
.sandbox-panel p { font-size: 1.02rem; line-height: 1.9; text-align: justify; }

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 13px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 15px 20px;
    margin-bottom: 10px;
    font-size: 1rem;
    line-height: 1.75;
}
.feature-list i { margin-top: 6px; font-size: 0.9rem; }
.feature-list .fa-star { color: var(--gold); }
.feature-list .fa-circle-check { color: #3E9B6E; }

.course-cta {
    text-align: center;
    background:
        radial-gradient(ellipse 420px 220px at 88% -20%, rgba(198, 161, 91, 0.22) 0%, transparent 60%),
        linear-gradient(150deg, var(--navy-900), var(--navy-800));
    color: #fff;
    border-radius: var(--radius);
    padding: 52px 26px;
    margin-top: 56px;
}
.course-cta h2 { font-size: 1.5rem; letter-spacing: 0.04em; }
.course-cta p { color: rgba(255, 255, 255, 0.68); margin: 10px 0 28px; }
.cta-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.course-cta .btn-navy-outline { border-color: rgba(255, 255, 255, 0.5); color: #fff; }
.course-cta .btn-navy-outline:hover { background: rgba(255, 255, 255, 0.1); border-color: #fff; }

/* ============================================================
   全屏页（程序占位 / 404）
   ============================================================ */
.fullpage-hero {
    --cat-color: var(--gold);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    background:
        radial-gradient(ellipse 700px 420px at 85% -10%, color-mix(in srgb, var(--cat-color) 26%, transparent) 0%, transparent 60%),
        radial-gradient(ellipse 600px 400px at 10% 110%, rgba(198, 161, 91, 0.12) 0%, transparent 55%),
        linear-gradient(155deg, var(--navy-950) 0%, var(--navy-900) 60%, var(--navy-800) 100%);
    padding: 40px 20px;
}

.fullpage-content { max-width: 620px; }

.fullpage-icon {
    width: 96px; height: 96px;
    margin: 0 auto 26px;
    border-radius: 26px;
    display: grid;
    place-items: center;
    font-size: 2.4rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.16);
}
.pulse { animation: pulse 2.4s infinite; }
@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(198, 161, 91, 0.35); }
    50% { box-shadow: 0 0 0 22px rgba(198, 161, 91, 0); }
}

.fullpage-eyebrow { color: var(--gold); letter-spacing: 0.2em; font-size: 0.88rem; margin-bottom: 12px; }
.fullpage-hero h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); letter-spacing: 0.04em; margin-bottom: 16px; }
.fullpage-text { color: rgba(255, 255, 255, 0.72); font-size: 1.05rem; margin-bottom: 26px; }

.fullpage-tip {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    padding: 9px 20px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 34px;
}
.fullpage-tip i { color: var(--gold); }

.fullpage-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

.fullpage-404 {
    font-family: var(--font-serif);
    font-size: clamp(4.5rem, 12vw, 7rem);
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(160deg, #fff 20%, var(--gold) 90%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 8px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; gap: 56px; text-align: center; }
    .hero-text { display: flex; flex-direction: column; align-items: center; }
    .hero-intro { max-width: 580px; }
    .hero { padding: 148px 0 140px; }
    .hero-badge { left: -18px; }
    .about-grid { grid-template-columns: 1fr; gap: 36px; }
    .about-quote-card { position: static; }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 72px; left: 0; right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        gap: 0;
        padding: 12px 6vw 18px;
        box-shadow: var(--shadow-md);
        display: none;
    }
    .nav-links.open { display: flex; }
    .nav-links a { color: var(--text) !important; padding: 14px 0; border-bottom: 1px solid var(--line); }
    .nav-links li:last-child a { border-bottom: none; }
    .nav-links a::after { display: none; }
    .menu-toggle { display: block; }

    .stats-card { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
    .stat:nth-child(3)::before { display: none; }
    .section { padding: 76px 0; }
    .clients-grid { grid-template-columns: 1fr; }
    .course-hero-main { flex-direction: column; gap: 18px; }
    .category-head { flex-wrap: wrap; }
    .category-count { margin-left: 0; }
}

@media (max-width: 480px) {
    .hero { padding: 128px 0 130px; }
    .hero-actions { flex-direction: column; width: 100%; }
    .hero-actions .btn { justify-content: center; }
    .hero-badge { left: 50%; transform: translateX(-50%); bottom: -24px; flex-direction: row; align-items: baseline; gap: 8px; }
    .stats-card { padding: 26px 10px; }
    .stat-number { font-size: 2rem; }
    .card-actions { flex-direction: column; }
    .cards-grid { grid-template-columns: 1fr; }
    .sandbox-panel { padding: 22px 20px; }
    .sandbox-icon { display: none; }
}