/* ============================================================
   职场小杨哥 · 个人品牌网站样式表
   配色：墨蓝（专业）+ 活力橙（亲和）+ 收获金 + 暖米白
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
    --c-ink: #0f2847;          /* 墨蓝主色 */
    --c-ink-deep: #0a1d33;     /* 深墨蓝 */
    --c-orange: #ff6b35;        /* 活力橙 */
    --c-orange-soft: #ff8c5a;
    --c-gold: #ffb627;          /* 收获金 */
    --c-cream: #faf6ef;         /* 暖米白背景 */
    --c-paper: #ffffff;         /* 卡片白 */
    --c-text: #1a1a2e;          /* 正文深色 */
    --c-text-soft: #5a6478;     /* 次要文字 */
    --c-text-mute: #8a93a6;     /* 弱化文字 */
    --c-line: #e8e2d6;          /* 分割线 */
    --c-bg-soft: #f3ede2;       /* 次级背景 */

    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 24px;
    --shadow-sm: 0 2px 8px rgba(15, 40, 71, 0.06);
    --shadow: 0 10px 30px rgba(15, 40, 71, 0.08);
    --shadow-lg: 0 20px 50px rgba(15, 40, 71, 0.12);
    --shadow-orange: 0 12px 30px rgba(255, 107, 53, 0.28);

    --font: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI",
            "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

    --container: 1200px;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    color: var(--c-text);
    background: var(--c-cream);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 通用按钮 ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 8px; padding: 14px 30px; border-radius: 50px;
    font-size: 15px; font-weight: 700; letter-spacing: 0.5px;
    transition: transform .3s var(--ease), box-shadow .3s var(--ease),
                background .3s var(--ease), color .3s var(--ease);
    will-change: transform;
}
.btn-primary {
    background: linear-gradient(135deg, var(--c-orange) 0%, var(--c-gold) 100%);
    color: #fff;
    box-shadow: var(--shadow-orange);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 36px rgba(255, 107, 53, 0.36); }
.btn-ghost {
    background: rgba(255, 255, 255, 0.12);
    color: #fff; border: 1.5px solid rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.22); transform: translateY(-3px); }
.btn-outline {
    background: transparent; color: var(--c-ink);
    border: 1.5px solid var(--c-ink);
}
.btn-outline:hover { background: var(--c-ink); color: #fff; transform: translateY(-3px); }

/* ============================================================
   导航栏
   ============================================================ */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(250, 246, 239, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: background .4s var(--ease), box-shadow .4s var(--ease),
                border-color .4s var(--ease);
}
.navbar.scrolled {
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--shadow-sm);
    border-bottom-color: var(--c-line);
}
.nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 72px;
}

/* 品牌Logo（突出） */
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
    width: 44px; height: 44px; border-radius: 12px;
    background: linear-gradient(135deg, var(--c-ink) 0%, #1a3a5c 100%);
    color: var(--c-gold); font-size: 22px; font-weight: 900;
    display: grid; place-items: center;
    box-shadow: var(--shadow-sm); flex-shrink: 0;
    border: 2px solid var(--c-gold);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 18px; font-weight: 900; color: var(--c-ink); letter-spacing: 0.5px; }
.brand-slogan { font-size: 11px; color: var(--c-orange); font-weight: 700; letter-spacing: 2px; }

.nav-menu { display: flex; align-items: center; gap: 6px; }
.nav-menu a {
    padding: 8px 14px; font-size: 14.5px; font-weight: 500;
    color: var(--c-text-soft); border-radius: 8px;
    transition: color .25s, background .25s;
}
.nav-menu a:hover { color: var(--c-ink); background: rgba(15, 40, 71, 0.06); }
.nav-menu .nav-cta {
    background: var(--c-ink); color: #fff; margin-left: 8px;
    padding: 10px 22px; font-weight: 700;
}
.nav-menu .nav-cta:hover { background: var(--c-orange); color: #fff; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span {
    width: 24px; height: 2.5px; background: var(--c-ink); border-radius: 2px;
    transition: transform .3s var(--ease), opacity .3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
    position: relative; min-height: 100vh; min-height: 100svh;
    display: flex; align-items: center;
    padding: 120px 0 80px; overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0; z-index: -2;
    background:
        radial-gradient(circle at 80% 20%, rgba(255, 107, 53, 0.18) 0%, transparent 45%),
        radial-gradient(circle at 15% 75%, rgba(255, 182, 39, 0.14) 0%, transparent 45%),
        linear-gradient(160deg, var(--c-ink-deep) 0%, var(--c-ink) 55%, #163b5c 100%);
}
.hero-overlay {
    position: absolute; inset: 0; z-index: -1;
    background:
        radial-gradient(circle at 50% 50%, transparent 0%, rgba(10, 29, 51, 0.4) 100%);
    opacity: 0.5;
}
.hero-inner { color: #fff; max-width: 820px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 7px 16px; border-radius: 50px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 13px; font-weight: 500; color: #fff;
    margin-bottom: 28px; backdrop-filter: blur(6px);
}
.pulse-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--c-gold); position: relative;
}
.pulse-dot::after {
    content: ""; position: absolute; inset: -4px; border-radius: 50%;
    background: var(--c-gold); opacity: 0.4;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0% { transform: scale(1); opacity: 0.5; }
    100% { transform: scale(2.5); opacity: 0; }
}
.hero-title {
    font-size: clamp(2.1rem, 5.2vw, 3.8rem); font-weight: 900;
    line-height: 1.25; letter-spacing: -0.5px; margin-bottom: 24px;
}
.hero-title .accent {
    background: linear-gradient(120deg, var(--c-gold) 0%, var(--c-orange) 100%);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-desc {
    font-size: clamp(1rem, 1.6vw, 1.15rem); line-height: 1.85;
    color: rgba(255, 255, 255, 0.82); max-width: 640px; margin-bottom: 36px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 60px; }

.hero-meta {
    display: flex; align-items: center; gap: 28px;
    padding-top: 36px; border-top: 1px solid rgba(255, 255, 255, 0.15);
}
.meta-item { display: flex; flex-direction: column; gap: 4px; }
.meta-item strong {
    font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 900; color: var(--c-gold);
    line-height: 1;
}
.meta-item strong span { font-size: 0.6em; }
.meta-item span { font-size: 13px; color: rgba(255, 255, 255, 0.7); }
.meta-divider { width: 1px; height: 36px; background: rgba(255, 255, 255, 0.18); }

.scroll-cue {
    position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
    width: 26px; height: 44px; border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 14px; display: grid; place-items: start center; padding-top: 7px;
}
.scroll-cue span {
    width: 4px; height: 8px; background: var(--c-gold); border-radius: 2px;
    animation: scrollDown 1.8s infinite;
}
@keyframes scrollDown {
    0% { transform: translateY(0); opacity: 1; }
    70% { transform: translateY(14px); opacity: 0; }
    100% { transform: translateY(0); opacity: 0; }
}

/* ============================================================
   通用区块
   ============================================================ */
.section { padding: 96px 0; }
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-eyebrow {
    display: inline-block; font-size: 13px; font-weight: 700;
    color: var(--c-orange); letter-spacing: 3px; text-transform: uppercase;
    margin-bottom: 14px;
}
.section-title {
    font-size: clamp(1.7rem, 3.5vw, 2.5rem); font-weight: 900;
    color: var(--c-ink); line-height: 1.3; letter-spacing: -0.3px;
}
.section-subtitle {
    font-size: clamp(0.95rem, 1.4vw, 1.1rem); color: var(--c-text-soft);
    margin-top: 16px; line-height: 1.8;
}
/* 浅色背景section上的标题配色 */
.section-head-light .section-title { color: #fff; }
.section-head-light .section-subtitle { color: rgba(255, 255, 255, 0.78); }
.section-head-light .section-eyebrow { color: var(--c-gold); }

/* ============================================================
   关于我
   ============================================================ */
.about { background: var(--c-cream); }
.about-grid {
    display: grid; grid-template-columns: 380px 1fr; gap: 64px;
    align-items: start;
}
.about-portrait { position: sticky; top: 96px; }
.portrait-frame {
    border-radius: var(--radius-lg); padding: 14px;
    background: linear-gradient(160deg, var(--c-paper) 0%, var(--c-bg-soft) 100%);
    box-shadow: var(--shadow-lg); position: relative;
}
.portrait-frame::before {
    content: ""; position: absolute; inset: -3px; z-index: -1;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--c-orange), var(--c-gold), var(--c-ink));
}
.portrait-placeholder {
    aspect-ratio: 4 / 5; border-radius: var(--radius);
    background: linear-gradient(160deg, var(--c-ink) 0%, #1a3a5c 100%);
    display: grid; place-content: center; gap: 16px; color: #fff;
    text-align: center; position: relative; overflow: hidden;
}
.portrait-placeholder::after {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255, 182, 39, 0.25), transparent 60%);
}
.portrait-mark {
    font-size: 96px; font-weight: 900; color: var(--c-gold);
    position: relative; z-index: 1; line-height: 1;
}
.portrait-placeholder small {
    font-size: 12px; color: rgba(255, 255, 255, 0.6); position: relative; z-index: 1;
}
.portrait-tags {
    display: flex; justify-content: center; gap: 10px; margin-top: 20px;
}
.portrait-tags span {
    padding: 6px 14px; border-radius: 50px; font-size: 13px; font-weight: 600;
    background: var(--c-paper); color: var(--c-ink);
    box-shadow: var(--shadow-sm); border: 1px solid var(--c-line);
}

.about-content h3 {
    font-size: 1.75rem; font-weight: 900; color: var(--c-ink);
    margin-bottom: 18px;
}
.about-intro p {
    font-size: 1.05rem; color: var(--c-text); line-height: 1.9;
    margin-bottom: 16px;
}
.about-intro strong { color: var(--c-ink); }

.about-creed { margin-top: 40px; padding-top: 40px; border-top: 2px dashed var(--c-line); }
.about-creed h4 {
    font-size: 1.15rem; font-weight: 800; color: var(--c-ink); margin-bottom: 24px;
    display: inline-flex; align-items: center; gap: 10px;
}
.about-creed h4::before {
    content: ""; width: 28px; height: 3px; background: var(--c-orange); border-radius: 2px;
}
.creed-list { display: flex; flex-direction: column; gap: 22px; }
.creed-list li { display: flex; gap: 16px; }
.creed-icon {
    flex-shrink: 0; width: 34px; height: 34px; border-radius: 10px;
    background: linear-gradient(135deg, var(--c-orange), var(--c-gold));
    color: #fff; font-size: 15px; font-weight: 900;
    display: grid; place-items: center;
}
.creed-list strong { display: block; font-size: 1.05rem; color: var(--c-ink); margin-bottom: 4px; }
.creed-list p { font-size: 0.95rem; color: var(--c-text-soft); line-height: 1.75; }

/* ============================================================
   内容矩阵
   ============================================================ */
.content-section { background: var(--c-bg-soft); }
.content-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.content-card {
    background: var(--c-paper); border-radius: var(--radius-lg);
    padding: 36px 28px; box-shadow: var(--shadow-sm);
    border: 1px solid var(--c-line); position: relative; overflow: hidden;
    transition: transform .4s var(--ease), box-shadow .4s var(--ease);
}
.content-card::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--tone, var(--c-ink));
}
.content-card[data-tone="blue"]   { --tone: linear-gradient(90deg, #2e5cb8, #4d80e0); }
.content-card[data-tone="orange"] { --tone: linear-gradient(90deg, var(--c-orange), var(--c-orange-soft)); }
.content-card[data-tone="gold"]   { --tone: linear-gradient(90deg, #e89100, var(--c-gold)); }
.content-card[data-tone="green"]  { --tone: linear-gradient(90deg, #2a9d8f, #5cc4b8); }

.content-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.card-icon {
    width: 56px; height: 56px; border-radius: 16px; margin-bottom: 22px;
    display: grid; place-items: center; color: #fff;
    background: var(--c-ink);
}
.content-card[data-tone="blue"]   .card-icon { background: #2e5cb8; }
.content-card[data-tone="orange"] .card-icon { background: var(--c-orange); }
.content-card[data-tone="gold"]   .card-icon { background: #e89100; }
.content-card[data-tone="green"]  .card-icon { background: #2a9d8f; }
.card-icon svg { width: 28px; height: 28px; }
.content-card h3 { font-size: 1.3rem; font-weight: 800; color: var(--c-ink); margin-bottom: 12px; }
.content-card p { font-size: 0.95rem; color: var(--c-text-soft); line-height: 1.75; margin-bottom: 20px; }
.card-count {
    font-size: 12px; font-weight: 700; color: var(--c-orange);
    letter-spacing: 1px; padding-top: 16px; border-top: 1px dashed var(--c-line);
    display: block;
}

/* ============================================================
   精选内容
   ============================================================ */
.featured { background: var(--c-cream); }
.featured-grid {
    display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px;
    grid-template-areas:
        "hero a"
        "hero b"
        "c    d";
}
.featured-item {
    background: var(--c-paper); border-radius: var(--radius-lg);
    overflow: hidden; box-shadow: var(--shadow-sm); border: 1px solid var(--c-line);
    display: flex; flex-direction: column;
    transition: transform .4s var(--ease), box-shadow .4s var(--ease);
}
.featured-item:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.featured-hero { grid-area: hero; }
.featured-item:nth-child(2) { grid-area: a; }
.featured-item:nth-child(3) { grid-area: b; }
.featured-item:nth-child(4) { grid-area: c; }
.featured-item:nth-child(5) { grid-area: d; }

.featured-img {
    width: 100%; aspect-ratio: 16 / 9; position: relative; overflow: hidden;
    background-size: cover; background-position: center;
}
.featured-img-sm { aspect-ratio: 16 / 10; }
/* 用CSS渐变作为占位视觉（可替换为真实配图） */
.featured-img[data-img="office"]   { background: linear-gradient(135deg, #0f2847 0%, #2e5cb8 100%); }
.featured-img[data-img="career"]   { background: linear-gradient(135deg, #ff6b35 0%, #ffb627 100%); }
.featured-img[data-img="meeting"]   { background: linear-gradient(135deg, #2a9d8f 0%, #5cc4b8 100%); }
.featured-img[data-img="contract"]  { background: linear-gradient(135deg, #e89100 0%, #ff6b35 100%); }
.featured-img[data-img="growth"]   { background: linear-gradient(135deg, #1a3a5c 0%, #2e5cb8 100%); }
.featured-img::after {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(circle at 70% 30%, rgba(255,255,255,0.18), transparent 50%);
}

.featured-body { padding: 24px 24px 26px; flex: 1; display: flex; flex-direction: column; }
.featured-hero .featured-body { padding: 32px; }
.tag {
    align-self: flex-start; font-size: 12px; font-weight: 700;
    padding: 4px 10px; border-radius: 6px; margin-bottom: 14px;
    background: var(--c-bg-soft); color: var(--c-text-soft);
    letter-spacing: 0.5px;
}
.tag-hot { background: rgba(255, 107, 53, 0.12); color: var(--c-orange); }
.tag-warn { background: rgba(232, 145, 0, 0.14); color: #e89100; }
.featured-body h3 {
    font-size: 1.15rem; font-weight: 800; color: var(--c-ink);
    line-height: 1.5; margin-bottom: 10px;
}
.featured-hero .featured-body h3 { font-size: 1.5rem; }
.featured-body p { font-size: 0.92rem; color: var(--c-text-soft); line-height: 1.7; flex: 1; }
.featured-hero .featured-body p { font-size: 1rem; }
.featured-meta {
    display: flex; align-items: center; gap: 8px; margin-top: 18px;
    font-size: 13px; color: var(--c-text-mute);
}
.meta-author { color: var(--c-orange); font-weight: 700; }

.featured-more { text-align: center; margin-top: 48px; }

/* ============================================================
   数据成就
   ============================================================ */
.stats {
    background: linear-gradient(160deg, var(--c-ink-deep) 0%, var(--c-ink) 100%);
    color: #fff; position: relative; overflow: hidden;
}
.stats::before {
    content: ""; position: absolute; top: -20%; right: -10%;
    width: 500px; height: 500px; border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 182, 39, 0.12) 0%, transparent 60%);
}
.stats .container { position: relative; z-index: 1; }
.stats-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    margin-bottom: 56px;
}
.stat-card {
    text-align: center; padding: 36px 20px;
    background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius); backdrop-filter: blur(6px);
    transition: transform .4s var(--ease), background .4s;
}
.stat-card:hover { transform: translateY(-6px); background: rgba(255, 255, 255, 0.07); }
.stat-num {
    font-size: clamp(2rem, 3.5vw, 2.8rem); font-weight: 900; color: var(--c-gold);
    line-height: 1; margin-bottom: 12px; display: flex; align-items: baseline;
    justify-content: center; gap: 2px;
}
.stat-num em { font-size: 0.45em; font-style: normal; color: rgba(255,255,255,0.6); }
.stat-label { font-size: 14px; color: rgba(255, 255, 255, 0.75); letter-spacing: 1px; }

.stats-quote {
    max-width: 760px; margin: 0 auto; text-align: center;
    font-size: clamp(1.05rem, 1.8vw, 1.3rem); font-style: normal;
    line-height: 1.9; color: rgba(255, 255, 255, 0.92);
    padding: 36px 40px; position: relative;
}
.stats-quote::before, .stats-quote::after {
    content: """; position: absolute; font-size: 80px; color: var(--c-gold);
    opacity: 0.3; font-family: Georgia, serif; line-height: 1;
}
.stats-quote::before { top: -10px; left: 0; }
.stats-quote::after { bottom: -40px; right: 0; }
.stats-quote cite {
    display: block; margin-top: 20px; font-size: 15px; font-style: normal;
    color: var(--c-orange); font-weight: 700;
}

/* ============================================================
   FAQ（两栏布局）
   ============================================================ */
.faq { background: var(--c-bg-soft); }
.faq-layout {
    display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px;
}
.faq-col { display: flex; flex-direction: column; gap: 16px; }
.faq-item {
    background: var(--c-paper); border: 1px solid var(--c-line);
    border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow .3s, border-color .3s;
}
.faq-item.active { box-shadow: var(--shadow); border-color: var(--c-orange); }
.faq-q {
    width: 100%; display: flex; align-items: center; justify-content: space-between;
    gap: 16px; padding: 22px 24px; text-align: left;
    font-size: 1rem; font-weight: 700; color: var(--c-ink);
}
.faq-icon {
    flex-shrink: 0; width: 20px; height: 20px; position: relative;
}
.faq-icon::before, .faq-icon::after {
    content: ""; position: absolute; top: 50%; left: 50%;
    background: var(--c-orange); border-radius: 2px;
    transform: translate(-50%, -50%); transition: transform .3s var(--ease), opacity .3s;
}
.faq-icon::before { width: 16px; height: 2.5px; }
.faq-icon::after { width: 2.5px; height: 16px; }
.faq-item.active .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }

.faq-a {
    max-height: 0; overflow: hidden;
    transition: max-height .4s var(--ease);
}
.faq-a p { padding: 0 24px 24px; font-size: 0.95rem; color: var(--c-text-soft); line-height: 1.85; }
.faq-item.active .faq-a { max-height: 400px; }

/* ============================================================
   合作联系
   ============================================================ */
.contact { background: var(--c-cream); }
.contact-card {
    background: linear-gradient(160deg, var(--c-ink) 0%, #163b5c 100%);
    border-radius: var(--radius-lg); padding: 64px; color: #fff;
    position: relative; overflow: hidden; text-align: center;
    box-shadow: var(--shadow-lg);
}
.contact-card::before {
    content: ""; position: absolute; top: -30%; right: -10%;
    width: 400px; height: 400px; border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.2) 0%, transparent 60%);
}
.contact-card .section-eyebrow { color: var(--c-gold); }
.contact-text { position: relative; z-index: 1; max-width: 640px; margin: 0 auto; }
.contact-card .section-title { color: #fff; }
.contact-card .section-subtitle { color: rgba(255, 255, 255, 0.8); }
.contact-actions {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 14px;
    margin: 36px 0 40px; position: relative; z-index: 1;
}
.contact-actions .btn-outline {
    color: #fff; border-color: rgba(255, 255, 255, 0.5);
}
.contact-actions .btn-outline:hover { background: #fff; color: var(--c-ink); border-color: #fff; }
.contact-channels {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 48px;
    padding-top: 36px; border-top: 1px solid rgba(255, 255, 255, 0.15);
    position: relative; z-index: 1;
}
.channel { text-align: center; }
.channel-label {
    display: block; font-size: 12px; color: rgba(255, 255, 255, 0.6);
    letter-spacing: 2px; margin-bottom: 6px;
}
.channel strong { font-size: 1rem; color: var(--c-gold); }

/* ============================================================
   页脚
   ============================================================ */
.footer { background: var(--c-ink-deep); color: rgba(255, 255, 255, 0.7); padding: 56px 0 32px; }
.footer-inner {
    display: flex; flex-wrap: wrap; align-items: center;
    justify-content: space-between; gap: 32px;
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand .brand-mark { width: 40px; height: 40px; font-size: 20px; }
.footer-brand strong { display: block; font-size: 16px; color: #fff; }
.footer-brand small { font-size: 12px; color: rgba(255, 255, 255, 0.5); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-nav a { font-size: 14px; transition: color .25s; }
.footer-nav a:hover { color: var(--c-gold); }
.footer-copy { text-align: right; }
.footer-copy p { font-size: 13px; line-height: 1.7; }
.footer-note { color: rgba(255, 255, 255, 0.4); font-size: 12px; }

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
    position: fixed; bottom: 32px; right: 32px; z-index: 90;
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--c-ink); color: #fff;
    display: grid; place-items: center; box-shadow: var(--shadow);
    opacity: 0; visibility: hidden; transform: translateY(20px);
    transition: opacity .3s, visibility .3s, transform .3s, background .3s;
}
.back-top svg { width: 20px; height: 20px; }
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--c-orange); }

/* ============================================================
   滚动渐入动画
   ============================================================ */
.reveal {
    opacity: 0; transform: translateY(30px);
    transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
    .content-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 320px 1fr; gap: 40px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .featured-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-areas: "hero hero" "a b" "c d";
    }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .section { padding: 64px 0; }
    .section-head { margin-bottom: 40px; }

    /* 移动端导航收起 */
    .nav-toggle { display: flex; }
    .nav-menu {
        position: fixed; top: 72px; left: 0; right: 0;
        flex-direction: column; align-items: stretch; gap: 0;
        background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(12px);
        padding: 12px 20px 24px; box-shadow: var(--shadow);
        max-height: 0; overflow: hidden;
        transition: max-height .4s var(--ease);
    }
    .nav-menu.open { max-height: 420px; }
    .nav-menu a { padding: 14px 12px; border-bottom: 1px solid var(--c-line); }
    .nav-menu .nav-cta { margin: 8px 0 0; text-align: center; }

    /* Hero 移动端：标题居中 */
    .hero { padding: 110px 0 60px; min-height: auto; }
    .hero-inner { text-align: center; }
    .hero-badge { margin-left: auto; margin-right: auto; }
    .hero-title { text-align: center; }
    .hero-desc { margin-left: auto; margin-right: auto; text-align: left; }
    .hero-actions { justify-content: center; }
    .hero-meta { justify-content: center; gap: 20px; flex-wrap: wrap; }
    .meta-divider { display: none; }

    /* 关于我：单列 */
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-portrait { position: static; max-width: 320px; margin: 0 auto; }
    .about-content h3 { text-align: center; }
    .about-creed { text-align: left; }

    /* 内容矩阵：单列 */
    .content-grid { grid-template-columns: 1fr; }

    /* 精选：单列 */
    .featured-grid { grid-template-columns: 1fr; grid-template-areas: "hero" "a" "b" "c" "d"; }

    /* 数据：单列 */
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stats-quote { padding: 24px 12px; }

    /* FAQ：移动端单列（桌面两栏，符合品牌站偏好） */
    .faq-layout { grid-template-columns: 1fr; gap: 16px; }

    /* 合作 */
    .contact-card { padding: 40px 24px; }
    .contact-channels { gap: 28px; }

    /* 页脚 */
    .footer-inner { flex-direction: column; align-items: center; text-align: center; }
    .footer-copy { text-align: center; }

    .back-top { bottom: 20px; right: 20px; width: 44px; height: 44px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .hero-meta { gap: 16px; }
    .meta-item strong { font-size: 1.5rem; }
}

/* ============================================================
   页脚社交二维码
   ============================================================ */
.footer-social {
    padding: 44px 0 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}
.social-lead {
    font-size: 14px; color: rgba(255, 255, 255, 0.6);
    margin-bottom: 26px; letter-spacing: 1px;
}
.social-lead span { color: var(--c-gold); font-weight: 700; }
.social-list {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 26px; position: relative;
}
.social-btn {
    position: relative; display: flex; flex-direction: column;
    align-items: center; gap: 9px; padding: 4px;
    background: none; border: none; cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.social-ic {
    width: 54px; height: 54px; border-radius: 15px;
    display: grid; place-items: center;
    color: #fff; font-size: 23px; font-weight: 800;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.28);
    transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.social-ic[data-brand="douyin"]   { background: #fe2c55; }
.social-ic[data-brand="kuaishou"] { background: #ff5000; }
.social-ic[data-brand="zhihu"]    { background: #0084ff; }
.social-ic[data-brand="wechat"]   { background: #07c160; }
.social-ic[data-brand="baidu"]    { background: #2932e1; }
.social-btn:hover .social-ic,
.social-btn.is-open .social-ic,
.social-btn:focus-visible .social-ic {
    transform: translateY(-5px) scale(1.06);
    box-shadow: 0 12px 26px rgba(0, 0, 0, 0.42);
}
.social-btn:focus-visible { outline: none; }
.social-name {
    font-size: 12px; color: rgba(255, 255, 255, 0.72);
    font-weight: 500; letter-spacing: 0.5px;
}

/* 二维码浮层 */
.social-popover {
    position: absolute; bottom: calc(100% + 14px); left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: #fff; border-radius: var(--radius);
    padding: 14px; box-shadow: var(--shadow-lg);
    width: 168px; text-align: center;
    opacity: 0; visibility: hidden; pointer-events: none;
    transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
    z-index: 60;
}
.social-popover::after {
    content: ""; position: absolute; bottom: -6px; left: 50%;
    width: 14px; height: 14px; background: #fff;
    transform: translateX(-50%) rotate(45deg);
    box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.06);
}
.social-popover img {
    width: 140px; height: 140px; object-fit: cover;
    border-radius: 10px; display: block; margin: 0 auto 10px;
    background: var(--c-bg-soft);
}
.social-popover span {
    display: block; font-size: 13px; color: var(--c-text);
    font-weight: 600; line-height: 1.4;
}
/* 桌面端：鼠标悬停显示 */
@media (hover: hover) {
    .social-btn:hover .social-popover,
    .social-btn:focus-within .social-popover {
        opacity: 1; visibility: visible;
        transform: translateX(-50%) translateY(0);
        pointer-events: auto;
    }
}
/* JS 控制：点击打开（移动端/触屏笔电） */
.social-btn.is-open .social-popover {
    opacity: 1; visibility: visible;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}
@media (max-width: 480px) {
    .social-list { gap: 18px; }
    .social-ic { width: 47px; height: 47px; font-size: 20px; border-radius: 12px; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; }
}