/* ============================================================
   趣蘑菇教育官网（中文站）
   Apple-inspired design language — 与国际站统一的设计体系
   ============================================================ */

:root {
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f5f7;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-brand: #2db84d;
    --color-brand-dark: #0d6e4f;
    --color-border: #d2d2d7;
    --radius-card: 24px;
    --radius-pill: 980px;
    --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC",
            "Helvetica Neue", "Segoe UI", "Microsoft YaHei", Roboto, Arial, sans-serif;
    --nav-h: 52px;
    --ease-out: cubic-bezier(0.28, 0.11, 0.32, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

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

/* ---------- 导航 ---------- */
.site-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    height: var(--nav-h);
    background: rgba(251, 251, 253, 0.8);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s var(--ease-out), background 0.3s var(--ease-out);
}
.site-nav.scrolled { border-bottom-color: var(--color-border); }

.nav-inner {
    max-width: 1080px;
    height: 100%;
    margin: 0 auto;
    padding: 0 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.brand-mark {
    width: 26px; height: 26px;
    border-radius: 8px;
    background: var(--color-brand);
    color: #fff;
    font-size: 14px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
}
.brand-name { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a {
    font-size: 13px;
    color: var(--color-text);
    opacity: 0.85;
    transition: opacity 0.2s;
    white-space: nowrap;
}
.nav-links a:hover, .nav-links a.is-active { opacity: 1; }
.nav-links a.is-active { font-weight: 600; }
.nav-links .nav-cta {
    background: var(--color-accent);
    color: #fff;
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    opacity: 1;
    transition: background 0.2s;
}
.nav-links .nav-cta:hover { background: var(--color-accent-hover); }

.nav-right { display: flex; align-items: center; gap: 12px; }

.lang-switch { position: relative; }
.lang-current {
    font-family: var(--font);
    font-size: 12px;
    color: var(--color-text);
    background: none;
    border: none;
    cursor: pointer;
    display: flex; align-items: center; gap: 4px;
    padding: 6px 4px;
}
.lang-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 140px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 14px;
    box-shadow: 0 12px 32px rgba(0,0,0,0.12);
    padding: 6px;
    display: none;
}
.lang-switch.open .lang-menu { display: block; }
.lang-menu li {
    font-size: 13px;
    border-radius: 9px;
}
.lang-menu li a, .lang-menu li.active {
    display: block;
    padding: 8px 12px;
}
.lang-menu li a:hover { background: var(--color-bg-alt); border-radius: 9px; }
.lang-menu li.active { background: var(--color-bg-alt); font-weight: 600; }

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none; border: none; cursor: pointer;
    padding: 8px;
}
.menu-toggle span {
    width: 18px; height: 1.5px;
    background: var(--color-text);
    transition: transform 0.3s var(--ease-out);
}
.menu-toggle.open span:first-child { transform: translateY(3.25px) rotate(45deg); }
.menu-toggle.open span:last-child { transform: translateY(-3.25px) rotate(-45deg); }

/* ---------- 英雄区 ---------- */
.hero {
    position: relative;
    min-height: 100svh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}
.hero-media { position: absolute; inset: 0; overflow: hidden; }
.hero-media img {
    width: 100%; height: 100%;
    object-fit: cover;
    transform: scale(1.05);
    animation: heroZoom 8s var(--ease-out) forwards;
}
@keyframes heroZoom { to { transform: scale(1); } }
.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0.28) 45%, rgba(0,0,0,0.6) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    padding: 120px 24px 80px;
}
.hero-eyebrow {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: rgba(255,255,255,0.95);
    background: rgba(255,255,255,0.14);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--radius-pill);
    padding: 7px 18px;
    margin-bottom: 22px;
}
.hero-title {
    font-size: clamp(38px, 7.5vw, 76px);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 22px;
}
.hero-sub {
    font-size: clamp(15px, 2vw, 18px);
    line-height: 1.7;
    color: rgba(255,255,255,0.92);
    max-width: 680px;
    margin: 0 auto 36px;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    padding: 14px 28px;
    border-radius: var(--radius-pill);
    border: none;
    cursor: pointer;
    font-family: var(--font);
    transition: background 0.2s, transform 0.2s var(--ease-out), color 0.2s;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-hover); }
.btn-ghost {
    background: rgba(255,255,255,0.14);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.35);
}
.btn-ghost:hover { background: rgba(255,255,255,0.24); }
.btn-outline {
    background: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}
.btn-outline:hover { background: rgba(0,113,227,0.06); }

.hero-scroll {
    position: absolute;
    bottom: 28px; left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    width: 26px; height: 42px;
    border: 1.5px solid rgba(255,255,255,0.6);
    border-radius: 14px;
    display: flex; justify-content: center;
}
.hero-scroll span {
    width: 3px; height: 8px;
    background: rgba(255,255,255,0.8);
    border-radius: 2px;
    margin-top: 7px;
    animation: scrollDot 1.8s ease-in-out infinite;
}
@keyframes scrollDot {
    0%, 100% { transform: translateY(0); opacity: 1; }
    60% { transform: translateY(10px); opacity: 0.2; }
}

/* ---------- 信任数据条 ---------- */
.trust { background: var(--color-bg-alt); }
.trust-inner {
    max-width: 1024px;
    margin: 0 auto;
    padding: 56px 24px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}
.trust-number {
    font-size: clamp(36px, 4.5vw, 52px);
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(120deg, var(--color-brand-dark), var(--color-brand));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.trust-plus, .trust-unit {
    font-size: clamp(24px, 3vw, 34px);
    font-weight: 700;
    color: var(--color-brand);
    margin-left: 2px;
}
.trust-label {
    display: block;
    margin-top: 6px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

/* ---------- 通用区块 ---------- */
.section { padding: 100px 24px; }
.section:nth-of-type(even) { background: var(--color-bg-alt); }

.section-head {
    max-width: 720px;
    margin: 0 auto 60px;
    text-align: center;
}
.eyebrow {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 12px;
}
.section-head h2, .flagship-content h2, .contact-info h2 {
    font-size: clamp(30px, 4.6vw, 48px);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 16px;
}
.section-sub {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 640px;
    margin: 0 auto;
}

/* ---------- 卡片网格 ---------- */
.card-grid {
    max-width: 1080px;
    margin: 0 auto;
    display: grid;
    gap: 20px;
}
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-2 { grid-template-columns: repeat(2, 1fr); max-width: 860px; }

/* 关于我们信息卡 */
.info-card {
    background: #fff;
    border-radius: var(--radius-card);
    padding: 32px 26px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
    transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}
.section:nth-of-type(odd) .info-card { background: var(--color-bg-alt); box-shadow: none; }
.info-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(0,0,0,0.08); }
.info-icon {
    width: 52px; height: 52px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(45,184,77,0.12), rgba(13,110,79,0.12));
    color: var(--color-brand-dark);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px;
}
.info-icon svg { width: 28px; height: 28px; }
.info-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.info-card p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.65; }

/* 业务卡 */
.biz-card {
    background: #fff;
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0,0,0,0.05);
    transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
    display: flex;
    flex-direction: column;
}
.biz-card:hover { transform: translateY(-6px); box-shadow: 0 24px 56px rgba(0,0,0,0.1); }
.biz-visual {
    position: relative;
    height: 130px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.biz-icon { font-size: 44px; filter: drop-shadow(0 4px 10px rgba(0,0,0,0.15)); }
.bg-forest { background: linear-gradient(135deg, #0d6e4f, #2db84d); }
.bg-ocean { background: linear-gradient(135deg, #0071e3, #42a5f5); }
.bg-sun { background: linear-gradient(135deg, #f2994a, #f7c948); }
.bg-leaf { background: linear-gradient(135deg, #219653, #6fcf97); }
.bg-mountain { background: linear-gradient(135deg, #5b6b8c, #9aa7c4); }
.bg-volunteer { background: linear-gradient(135deg, #8e2de2, #c471ed); }
.bg-volunteer-secondary { background: linear-gradient(135deg, #e65c00, #f9a825); }
.biz-badge {
    position: absolute;
    top: 12px; right: 12px;
    font-size: 11px;
    font-weight: 600;
    color: #fff;
    background: rgba(0,0,0,0.28);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-pill);
    padding: 4px 12px;
}
.biz-body { padding: 24px 26px 28px; display: flex; flex-direction: column; flex: 1; }
.biz-body h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 8px; }
.biz-body p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.65; margin-bottom: 16px; flex: 1; }
.card-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.card-link span { transition: transform 0.2s var(--ease-out); }
.card-link:hover span { transform: translateX(4px); }
.biz-card--featured { outline: 2px solid rgba(0,113,227,0.25); outline-offset: -2px; }

/* ---------- 旗舰营地 ---------- */
.flagship-grid {
    max-width: 1080px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}
.flagship-media { position: relative; }
.flagship-image {
    position: relative;
    border-radius: 28px;
    overflow: hidden;
    box-shadow: 0 24px 64px rgba(0,0,0,0.12);
}
.flagship-image img { width: 100%; height: 420px; object-fit: cover; }
.flagship-label {
    position: absolute;
    top: 18px; left: 18px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    background: rgba(0,0,0,0.4);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-pill);
    padding: 7px 16px;
}
.flagship-float-card {
    position: absolute;
    right: -18px; bottom: 32px;
    background: #fff;
    border-radius: 20px;
    padding: 18px 24px;
    box-shadow: 0 16px 48px rgba(0,0,0,0.14);
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.flagship-float-card strong { font-size: 12px; color: var(--color-text-secondary); font-weight: 600; }
.flagship-float-card .price {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(120deg, var(--color-brand-dark), var(--color-brand));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.flagship-float-card .price-note { font-size: 12px; color: var(--color-text-secondary); text-decoration: line-through; }
.flagship-lead { font-size: 16px; color: var(--color-text-secondary); margin-bottom: 24px; }
.flagship-features li {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    font-size: 15px;
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: 14px;
}
.feature-check {
    flex-shrink: 0;
    width: 22px; height: 22px;
    border-radius: 50%;
    background: rgba(45,184,77,0.14);
    color: var(--color-brand-dark);
    font-size: 12px;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    margin-top: 2px;
}
.flagship-actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }

/* ---------- 教育理念 ---------- */
.philo-card {
    background: #fff;
    border-radius: var(--radius-card);
    padding: 32px 26px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
    transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}
.section:nth-of-type(odd) .philo-card { background: var(--color-bg-alt); box-shadow: none; }
.philo-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(0,0,0,0.08); }
.philo-number {
    font-size: 15px;
    font-weight: 700;
    background: linear-gradient(120deg, var(--color-brand-dark), var(--color-brand));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 14px;
}
.philo-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.philo-card p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.65; }

/* 时间轴 */
.timeline {
    max-width: 1080px;
    margin: 64px auto 0;
    background: #fff;
    border-radius: 28px;
    padding: 44px 40px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}
.section:nth-of-type(odd) .timeline { background: var(--color-bg-alt); box-shadow: none; }
.timeline-title {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
    text-align: center;
    margin-bottom: 32px;
}
.timeline-track {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}
.timeline-track::before {
    content: "";
    position: absolute;
    top: 9px; left: 6%; right: 6%;
    height: 2px;
    background: linear-gradient(90deg, rgba(45,184,77,0.15), rgba(45,184,77,0.5), rgba(45,184,77,0.15));
}
.timeline-item { position: relative; text-align: center; padding-top: 30px; }
.timeline-item::before {
    content: "";
    position: absolute;
    top: 3px; left: 50%;
    transform: translateX(-50%);
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--color-brand);
    border: 3px solid #fff;
    box-shadow: 0 0 0 2px rgba(45,184,77,0.35);
}
.timeline-year {
    display: block;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--color-text);
    margin-bottom: 6px;
}
.timeline-item p { font-size: 13px; color: var(--color-text-secondary); line-height: 1.6; }

/* ---------- 导师团队 ---------- */
.team-card {
    background: #fff;
    border-radius: var(--radius-card);
    padding: 40px 34px;
    text-align: center;
    box-shadow: 0 4px 24px rgba(0,0,0,0.05);
    transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}
.section:nth-of-type(odd) .team-card { background: var(--color-bg-alt); box-shadow: none; }
.team-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(0,0,0,0.08); }
.team-avatar {
    width: 84px; height: 84px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-brand-dark), var(--color-brand));
    color: #fff;
    font-size: 34px;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 10px 28px rgba(45,184,77,0.3);
}
.team-avatar.avatar-q { background: linear-gradient(135deg, #0071e3, #42a5f5); box-shadow: 0 10px 28px rgba(0,113,227,0.28); }
.team-card h3 { font-size: 22px; font-weight: 700; letter-spacing: -0.01em; }
.team-role { font-size: 13px; color: var(--color-accent); font-weight: 600; margin: 6px 0 14px; }
.team-bio { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 18px; }
.team-certs { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.cert-tag {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-brand-dark);
    background: rgba(45,184,77,0.1);
    border-radius: var(--radius-pill);
    padding: 5px 14px;
}

/* ---------- 家长心声 ---------- */
.story-card {
    background: #fff;
    border-radius: var(--radius-card);
    padding: 34px 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 24px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}
.section:nth-of-type(odd) .story-card { background: var(--color-bg-alt); box-shadow: none; }
.story-card p {
    font-size: 16px;
    line-height: 1.7;
    letter-spacing: -0.01em;
}
.story-card footer strong { display: block; font-size: 14px; }
.story-card footer span { font-size: 13px; color: var(--color-text-secondary); }

/* ---------- 最新动态 ---------- */
.news-card {
    background: #fff;
    border-radius: var(--radius-card);
    padding: 28px 26px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
    transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}
.section:nth-of-type(odd) .news-card { background: var(--color-bg-alt); box-shadow: none; }
.news-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(0,0,0,0.08); }
.news-source {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-accent);
    background: rgba(0,113,227,0.08);
    border-radius: var(--radius-pill);
    padding: 4px 12px;
    margin-bottom: 12px;
}
.news-card time {
    display: block;
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}
.news-card h3 { font-size: 16px; font-weight: 700; line-height: 1.45; letter-spacing: -0.01em; margin-bottom: 8px; }
.news-card p { font-size: 13.5px; color: var(--color-text-secondary); line-height: 1.65; }

/* ---------- 联系我们 ---------- */
.contact-grid {
    max-width: 1080px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
}
.contact-lead { font-size: 16px; color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 32px; }
.contact-methods { display: flex; flex-direction: column; gap: 14px; }
.contact-method {
    display: flex;
    gap: 16px;
    align-items: center;
    background: #fff;
    border-radius: 18px;
    padding: 18px 22px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}
a.contact-method:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(0,0,0,0.08); }
.method-icon {
    flex-shrink: 0;
    width: 46px; height: 46px;
    border-radius: 14px;
    background: var(--color-bg-alt);
    font-size: 20px;
    display: flex; align-items: center; justify-content: center;
}
.contact-method strong { display: block; font-size: 15px; margin-bottom: 2px; }
.contact-method span { font-size: 13px; color: var(--color-text-secondary); }

.contact-form {
    background: #fff;
    border-radius: 28px;
    padding: 40px 36px;
    box-shadow: 0 24px 64px rgba(0,0,0,0.08);
}
.contact-form h3 { font-size: 22px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 7px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    font-family: var(--font);
    font-size: 14px;
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1.5px solid transparent;
    border-radius: 12px;
    padding: 12px 16px;
    outline: none;
    transition: border-color 0.2s, background 0.2s;
    appearance: none;
}
.form-group textarea { resize: vertical; min-height: 96px; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    background: #fff;
}
.form-group input.is-invalid,
.form-group select.is-invalid { border-color: #d70015; }
.error-message {
    display: none;
    font-size: 12px;
    color: #d70015;
    margin-top: 5px;
}
.form-group input.is-invalid ~ .error-message,
.form-group select.is-invalid ~ .error-message { display: block; }

.btn-submit { width: 100%; font-size: 16px; font-weight: 600; position: relative; }
.btn-loader {
    display: none;
    width: 18px; height: 18px;
    border: 2px solid rgba(255,255,255,0.4);
    border-top-color: #fff;
    border-radius: 50%;
    margin-left: 10px;
    animation: spin 0.8s linear infinite;
}
.btn-submit.is-loading .btn-loader { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
.form-status {
    margin-top: 14px;
    font-size: 13px;
    text-align: center;
    border-radius: 12px;
    padding: 0;
}
.form-status.is-success { padding: 12px; background: rgba(45,184,77,0.1); color: var(--color-brand-dark); }
.form-status.is-error { padding: 12px; background: rgba(215,0,21,0.08); color: #d70015; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); }
.footer-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 56px 24px 40px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 32px;
}
.footer-brand p {
    margin-top: 14px;
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}
.footer-social { display: flex; gap: 10px; margin-top: 16px; }
.footer-social a {
    font-size: 12px;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    padding: 5px 14px;
    transition: color 0.2s, border-color 0.2s;
}
.footer-social a:hover { color: var(--color-text); border-color: var(--color-text-secondary); }
.footer-col h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 14px;
}
.footer-col a, .footer-col span {
    display: block;
    font-size: 12.5px;
    color: var(--color-text-secondary);
    margin-bottom: 10px;
}
.footer-col a:hover { color: var(--color-text); text-decoration: underline; }
.footer-bottom {
    max-width: 1080px;
    margin: 0 auto;
    padding: 18px 24px 28px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}
.footer-bottom p { font-size: 11px; color: var(--color-text-secondary); }

/* ---------- 滚动揭示动画 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .flagship-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .flagship-float-card { right: 16px; }
}

@media (max-width: 900px) {
    .trust-inner { grid-template-columns: repeat(2, 1fr); gap: 36px; }
    .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
    .card-grid-2 { grid-template-columns: 1fr; }
    .timeline-track { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .timeline-track::before { display: none; }
    .section { padding: 80px 20px; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 734px) {
    .nav-links {
        position: fixed;
        top: var(--nav-h); left: 0; right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        background: rgba(251,251,253,0.96);
        -webkit-backdrop-filter: saturate(180%) blur(20px);
        backdrop-filter: saturate(180%) blur(20px);
        border-bottom: 1px solid var(--color-border);
        padding: 8px 24px 20px;
        display: none;
    }
    .nav-links.open { display: flex; }
    .nav-links a {
        width: 100%;
        font-size: 15px;
        padding: 13px 0;
        border-bottom: 1px solid var(--color-border);
    }
    .nav-links .nav-cta {
        margin-top: 14px;
        border-bottom: none;
        text-align: center;
        padding: 12px;
    }
    .menu-toggle { display: flex; }
    .card-grid-3, .card-grid-4 { grid-template-columns: 1fr; }
    .timeline-track { grid-template-columns: 1fr; }
    .flagship-image img { height: 300px; }
    .contact-form { padding: 32px 24px; }
    .footer-inner { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { justify-content: center; text-align: center; }
}

/* ===================== FAQ（GEO 优化新增） ===================== */
.faq { background: var(--color-bg-alt); }
.faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: grid;
    gap: 14px;
}
.faq-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 20px 26px;
    transition: border-color .25s ease;
}
.faq-item[open] { border-color: var(--color-brand); }
.faq-item summary {
    cursor: pointer;
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    flex: 0 0 auto;
    font-size: 22px;
    font-weight: 400;
    color: var(--color-brand);
    line-height: 1;
    transition: transform .25s ease;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
    margin-top: 12px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-text-secondary);
}
@media (max-width: 768px) {
    .faq-item { padding: 16px 18px; }
    .faq-item summary { font-size: 15.5px; }
}


/* ---------- 首页「最新文章」区块（由 publish_geo_article.py 自动维护） ---------- */
.latest-insights { background: var(--color-bg-alt); }
.latest-insights .section-head { text-align: center; margin-bottom: 34px; }
.latest-insights .eyebrow {
    font-size: 12px; letter-spacing: .12em; text-transform: uppercase;
    color: var(--color-brand); font-weight: 600; margin-bottom: 8px;
}
.latest-insights h2 { font-size: 30px; letter-spacing: -.02em; margin-bottom: 10px; }
.latest-insights .section-sub {
    font-size: 15px; color: var(--color-text-secondary); max-width: 620px; margin: 0 auto;
}
.li-grid {
    display: grid; gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    max-width: 1024px; margin: 0 auto;
}
.li-card {
    display: block; text-decoration: none; color: inherit;
    background: #fff; border: 1px solid var(--color-border);
    border-radius: var(--radius-card, 18px); padding: 22px 20px 18px;
    transition: transform .25s var(--ease-out, ease), box-shadow .25s var(--ease-out, ease);
}
.li-card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(0,0,0,.08); }
.li-tag {
    display: inline-block; font-size: 11px; font-weight: 600;
    color: var(--color-brand); background: var(--color-bg-alt);
    border-radius: var(--radius-pill, 980px); padding: 4px 10px; margin-bottom: 12px;
}
.li-card h3 { font-size: 17px; line-height: 1.45; margin-bottom: 8px; letter-spacing: -.01em; }
.li-card p { font-size: 13.5px; line-height: 1.65; color: var(--color-text-secondary); }
.li-date { display: block; margin-top: 12px; font-size: 12px; color: var(--color-text-secondary); opacity: .8; }
.li-more { text-align: center; margin-top: 26px; }
.li-more a { font-size: 14px; font-weight: 600; color: var(--color-brand); text-decoration: none; }
.li-more a:hover { text-decoration: underline; }
.li-note { text-align: center; margin-top: 10px; font-size: 12.5px; color: var(--color-text-secondary); }

@media (max-width: 768px) {
    .latest-insights h2 { font-size: 24px; }
    .li-grid { grid-template-columns: 1fr; }
}