/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-section: #fafbfc;
    --primary-blue: #1e6fff;
    --primary-blue-light: #4f8aff;
    --primary-blue-dark: #1557e0;
    --accent-orange: #ff6b35;
    --accent-orange-light: #ff8a5c;
    --accent-green: #10b981;
    --accent-green-light: #34d399;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 10px 40px rgba(30, 111, 255, 0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --max-width: 1200px;
}

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-white);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

/* ===== Navbar ===== */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    padding: 16px 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.nav-inner { display: flex; align-items: center; justify-content: flex-start; }

.logo { display: flex; align-items: center; height: 44px; }
.logo img { height: 44px; width: auto; object-fit: contain; }

.nav-links { display: flex; gap: 32px; list-style: none; margin-right: auto; }
.nav-links a {
    color: var(--text-secondary); font-size: 15px; font-weight: 500;
    transition: color 0.2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary-blue); }
.nav-links a::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--primary-blue);
    transition: width 0.3s; border-radius: 2px;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-cta {
    padding: 10px 24px; border-radius: var(--radius-sm);
    background: var(--primary-blue); color: white;
    font-size: 14px; font-weight: 600; transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(30, 111, 255, 0.25);
}
.nav-cta:hover {
    background: var(--primary-blue-dark); transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(30, 111, 255, 0.35);
}

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all 0.3s; }

/* ===== Hero ===== */
.hero {
    position: relative; padding: 140px 0 72px;
    background:
        radial-gradient(circle at 20% 30%, rgba(30, 111, 255, 0.08), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 107, 53, 0.06), transparent 50%),
        radial-gradient(circle at 50% 100%, rgba(16, 185, 129, 0.05), transparent 50%),
        var(--bg-white);
    overflow: hidden;
}

.hero::before {
    content: ''; position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(30, 111, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 111, 255, 0.04) 1px, transparent 1px);
    background-size: 60px 60px; z-index: 0; pointer-events: none;
}

.hero-content { position: relative; z-index: 1; text-align: center; max-width: 880px; margin: 0 auto; }

.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 18px; border-radius: 50px;
    background: rgba(30, 111, 255, 0.08); border: 1px solid rgba(30, 111, 255, 0.2);
    font-size: 13px; color: var(--primary-blue); margin-bottom: 24px; font-weight: 500;
}

.hero-badge .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--accent-green); box-shadow: 0 0 8px var(--accent-green);
    animation: pulse 2s infinite;
}

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero h1 {
    font-size: clamp(28px, 3.5vw, 42px); font-weight: 800;
    line-height: 1.25; margin-bottom: 20px; letter-spacing: -0.02em;
}

.hero h1 .highlight { color: var(--primary-blue); }
.hero h1 .highlight-orange { color: var(--accent-orange); }

.hero-subtitle {
    font-size: clamp(16px, 1.8vw, 19px); color: var(--text-secondary);
    max-width: 680px; margin: 0 auto 32px; line-height: 1.7;
}

.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn-primary {
    padding: 14px 32px; border-radius: var(--radius-sm);
    background: var(--primary-blue); color: white;
    font-size: 16px; font-weight: 600; transition: all 0.2s;
    box-shadow: 0 4px 16px rgba(30, 111, 255, 0.3);
    display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover {
    background: var(--primary-blue-dark); transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(30, 111, 255, 0.4);
}

.btn-secondary {
    padding: 14px 32px; border-radius: var(--radius-sm);
    background: var(--bg-white); border: 1.5px solid var(--border-color);
    color: var(--text-primary); font-size: 16px; font-weight: 600; transition: all 0.2s;
}
.btn-secondary:hover { border-color: var(--primary-blue); color: var(--primary-blue); }

/* ===== Platform Strip ===== */
.platform-strip {
    margin-top: 56px; padding: 28px 0;
    border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color);
    background: var(--bg-light);
}

.platform-label { text-align: center; font-size: 14px; color: var(--text-muted); margin-bottom: 20px; letter-spacing: 1px; }

.platform-list { display: flex; justify-content: center; align-items: center; gap: 40px; flex-wrap: wrap; }

.platform-item {
    font-size: 17px; font-weight: 600; color: var(--text-secondary);
    opacity: 0.8; transition: all 0.2s;
}
.platform-item:hover { opacity: 1; color: var(--primary-blue); }

/* ===== Section Common ===== */
section { padding: 72px 0; }

.section-header { text-align: center; margin-bottom: 44px; }

.section-tag {
    display: inline-block; padding: 5px 16px; border-radius: 50px;
    background: rgba(30, 111, 255, 0.08); border: 1px solid rgba(30, 111, 255, 0.18);
    font-size: 13px; color: var(--primary-blue); margin-bottom: 16px; font-weight: 500;
}
.section-tag.orange { background: rgba(255, 107, 53, 0.08); border-color: rgba(255, 107, 53, 0.2); color: var(--accent-orange); }
.section-tag.green { background: rgba(16, 185, 129, 0.08); border-color: rgba(16, 185, 129, 0.2); color: var(--accent-green); }

.section-title { font-size: clamp(28px, 4vw, 40px); font-weight: 700; margin-bottom: 16px; letter-spacing: -0.01em; }

.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; line-height: 1.7; }

/* ===== Services / Value Cards ===== */
#value, #services { background: var(--bg-section); }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; }

.service-card {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 40px 32px;
    transition: all 0.3s; position: relative; overflow: hidden;
}
.service-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
    background: var(--card-accent, var(--primary-blue));
    transform: scaleX(0); transform-origin: left; transition: transform 0.3s;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.service-card:hover::before { transform: scaleX(1); }

.service-card.blue { --card-accent: var(--primary-blue); }
.service-card.orange { --card-accent: var(--accent-orange); }
.service-card.green { --card-accent: var(--accent-green); }

.service-icon {
    width: 60px; height: 60px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px; margin-bottom: 24px;
}
.service-card.blue .service-icon { background: rgba(30, 111, 255, 0.1); }
.service-card.orange .service-icon { background: rgba(255, 107, 53, 0.1); }
.service-card.green .service-icon { background: rgba(16, 185, 129, 0.1); }

.service-card h3 { font-size: 21px; font-weight: 700; margin-bottom: 12px; }
.service-card p { color: var(--text-secondary); font-size: 15px; line-height: 1.75; }

/* ===== Advantages ===== */
.advantage-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 28px; }

.advantage-card {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 36px 32px;
    transition: all 0.3s; position: relative;
}
.advantage-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-hover); }

.advantage-num {
    position: absolute; top: 24px; right: 28px;
    font-size: 48px; font-weight: 800; line-height: 1;
}
.advantage-card:nth-child(1) .advantage-num { color: rgba(30, 111, 255, 0.08); }
.advantage-card:nth-child(2) .advantage-num { color: rgba(255, 107, 53, 0.08); }
.advantage-card:nth-child(3) .advantage-num { color: rgba(16, 185, 129, 0.08); }

.advantage-icon {
    width: 52px; height: 52px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; margin-bottom: 20px;
}
.advantage-card:nth-child(1) .advantage-icon { background: linear-gradient(135deg, rgba(30, 111, 255, 0.1), rgba(30, 111, 255, 0.05)); }
.advantage-card:nth-child(2) .advantage-icon { background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(255, 107, 53, 0.05)); }
.advantage-card:nth-child(3) .advantage-icon { background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05)); }

.advantage-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 14px; }
.advantage-card p { color: var(--text-secondary); font-size: 15px; line-height: 1.8; }

.highlight-box {
    margin-top: 20px; padding: 14px 18px;
    background: var(--bg-light); border-radius: 10px; border-left: 3px solid var(--primary-blue);
    font-size: 14px; color: var(--text-secondary); line-height: 1.7;
}
.advantage-card:nth-child(2) .highlight-box { border-left-color: var(--accent-orange); }
.advantage-card:nth-child(3) .highlight-box { border-left-color: var(--accent-green); }

/* ===== Process ===== */
#process { background: var(--bg-section); }

.process-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; }

.process-step {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 32px 24px; text-align: center; transition: all 0.3s;
}
.process-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.step-num {
    display: inline-block; width: 44px; height: 44px; line-height: 44px;
    border-radius: 50%; color: white; font-weight: 700; font-size: 18px; margin-bottom: 16px;
}
.process-step:nth-child(1) .step-num { background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-light)); box-shadow: 0 4px 12px rgba(30, 111, 255, 0.25); }
.process-step:nth-child(2) .step-num { background: linear-gradient(135deg, var(--accent-orange), var(--accent-orange-light)); box-shadow: 0 4px 12px rgba(255, 107, 53, 0.25); }
.process-step:nth-child(3) .step-num { background: linear-gradient(135deg, var(--accent-green), var(--accent-green-light)); box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25); }
.process-step:nth-child(4) .step-num { background: linear-gradient(135deg, var(--primary-blue), var(--accent-green)); box-shadow: 0 4px 12px rgba(30, 111, 255, 0.25); }

.process-step h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.process-step p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* ===== Cases ===== */
.cases-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }

.case-card {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 32px; transition: all 0.3s;
    display: block; text-decoration: none; color: inherit;
}
.case-card:hover { border-color: var(--border-hover); transform: translateY(-4px); box-shadow: var(--shadow-md); }

.case-tag {
    display: inline-block; padding: 4px 12px; border-radius: 50px;
    font-size: 12px; font-weight: 600; margin-bottom: 16px;
}
.case-tag.blue { background: rgba(30, 111, 255, 0.1); color: var(--primary-blue); }
.case-tag.orange { background: rgba(255, 107, 53, 0.1); color: var(--accent-orange); }
.case-tag.green { background: rgba(16, 185, 129, 0.1); color: var(--accent-green); }
.case-tag.purple { background: rgba(139, 92, 246, 0.1); color: #8b5cf6; }

.case-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.case-card p { color: var(--text-secondary); font-size: 15px; line-height: 1.7; margin-bottom: 20px; }

.case-result { display: flex; gap: 24px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.case-result-item .num { font-size: 24px; font-weight: 700; color: var(--primary-blue); }
.case-result-item .label { font-size: 12px; color: var(--text-muted); }
.case-card .read-more {
    margin-top: 16px; font-size: 14px; font-weight: 600;
    color: var(--primary-blue); display: inline-flex; align-items: center; gap: 4px;
}

/* ===== Contact ===== */
.contact-content { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }

.contact-info h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 700; margin-bottom: 20px; }
.contact-info .lead { color: var(--text-secondary); font-size: 16px; line-height: 1.8; margin-bottom: 32px; }

.contact-list { list-style: none; display: grid; gap: 20px; }
.contact-list li {
    display: flex; gap: 16px; align-items: flex-start;
    padding: 20px; background: var(--bg-light); border-radius: var(--radius-sm); transition: all 0.2s;
}
.contact-list li:hover { background: rgba(30, 111, 255, 0.04); }

.contact-icon {
    width: 44px; height: 44px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; flex-shrink: 0;
    background: rgba(30, 111, 255, 0.1);
}
.contact-list li:nth-child(2) .contact-icon { background: rgba(255, 107, 53, 0.1); }

.contact-list .label { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.contact-list .value { font-size: 16px; color: var(--text-primary); font-weight: 600; }
.contact-list .value a { color: var(--text-primary); transition: color 0.2s; }
.contact-list .value a:hover { color: var(--primary-blue); }

.contact-form {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow-sm);
}
.contact-form h3 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.contact-form .form-desc { color: var(--text-muted); font-size: 14px; margin-bottom: 28px; }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; color: var(--text-secondary); margin-bottom: 6px; font-weight: 500; }
.form-group input, .form-group textarea {
    width: 100%; padding: 12px 16px; border-radius: 10px;
    background: var(--bg-light); border: 1px solid var(--border-color);
    color: var(--text-primary); font-size: 15px; font-family: inherit; transition: all 0.2s;
}
.form-group input:focus, .form-group textarea:focus {
    outline: none; border-color: var(--primary-blue); background: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(30, 111, 255, 0.08);
}
.form-group textarea { resize: vertical; min-height: 110px; }

.form-submit {
    width: 100%; padding: 14px; border-radius: 10px;
    background: var(--primary-blue); color: white;
    font-size: 16px; font-weight: 600; border: none; cursor: pointer;
    transition: all 0.2s; margin-top: 8px;
}
.form-submit:hover { background: var(--primary-blue-dark); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(30, 111, 255, 0.3); }

/* ===== Page Header (subpages) ===== */
.page-header {
    padding: 140px 0 56px;
    background:
        radial-gradient(circle at 20% 30%, rgba(30, 111, 255, 0.06), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 107, 53, 0.04), transparent 50%),
        var(--bg-white);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: clamp(32px, 5vw, 48px); font-weight: 800;
    margin-bottom: 16px; letter-spacing: -0.02em;
}

.page-header p {
    font-size: 17px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; line-height: 1.7;
}

/* ===== Section CTA ===== */
.section-cta {
    text-align: center; margin-top: 40px;
}
.section-cta .btn-primary {
    padding: 12px 28px; font-size: 15px;
}
.section-cta .btn-secondary {
    padding: 12px 28px; font-size: 15px;
}

/* ===== Knowledge Cards ===== */
.knowledge-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }

.knowledge-card {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 32px; transition: all 0.3s; cursor: pointer;
}
.knowledge-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary-blue); }

.knowledge-card .cat-tag {
    display: inline-block; padding: 4px 12px; border-radius: 50px;
    font-size: 12px; font-weight: 600; margin-bottom: 16px;
    background: rgba(30, 111, 255, 0.08); color: var(--primary-blue);
}

.knowledge-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.knowledge-card p { color: var(--text-secondary); font-size: 15px; line-height: 1.7; }
.knowledge-card .read-more {
    margin-top: 16px; font-size: 14px; font-weight: 600;
    color: var(--primary-blue); display: inline-flex; align-items: center; gap: 4px;
}

/* ===== Knowledge Search & Filter ===== */
.kb-toolbar {
    display: flex; gap: 16px; align-items: center; justify-content: space-between;
    margin-bottom: 36px; flex-wrap: wrap;
}

.kb-search {
    flex: 1; min-width: 260px; position: relative;
}

.kb-search input {
    width: 100%; padding: 12px 16px 12px 44px;
    border-radius: var(--radius-sm); border: 1px solid var(--border-color);
    background: var(--bg-white); font-size: 15px; font-family: inherit;
    transition: all 0.2s;
}
.kb-search input:focus {
    outline: none; border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(30, 111, 255, 0.08);
}
.kb-search .search-icon {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    font-size: 18px; color: var(--text-muted); pointer-events: none;
}

.kb-filter {
    display: flex; gap: 8px; flex-wrap: wrap;
}
.kb-filter button {
    padding: 8px 16px; border-radius: 50px; border: 1px solid var(--border-color);
    background: var(--bg-white); color: var(--text-secondary);
    font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.2s; font-family: inherit;
}
.kb-filter button:hover { border-color: var(--primary-blue); color: var(--primary-blue); }
.kb-filter button.active {
    background: var(--primary-blue); color: white; border-color: var(--primary-blue);
}

.kb-no-result {
    text-align: center; padding: 48px 24px; color: var(--text-muted); font-size: 15px;
    display: none;
}

/* ===== Article List ===== */
.article-list { display: grid; gap: 16px; }

.article-item {
    display: flex; gap: 20px; align-items: flex-start;
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 24px 28px; transition: all 0.2s;
}
.article-item:hover { border-color: var(--primary-blue); box-shadow: var(--shadow-sm); }
.article-item .article-cat {
    flex-shrink: 0; padding: 4px 12px; border-radius: 50px;
    font-size: 12px; font-weight: 600; white-space: nowrap;
    background: rgba(30, 111, 255, 0.08); color: var(--primary-blue);
}
.article-item .article-body { flex: 1; }
.article-item h3 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.article-item h3 a { transition: color 0.2s; }
.article-item h3 a:hover { color: var(--primary-blue); }
.article-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.article-item .article-meta {
    display: flex; gap: 16px; margin-top: 8px;
    font-size: 13px; color: var(--text-muted);
}

/* ===== Article Detail Page ===== */
.article-detail {
    max-width: 820px; margin: 0 auto;
}

.article-detail .back-link {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--text-secondary); font-size: 14px; margin-bottom: 24px; transition: color 0.2s;
}
.article-detail .back-link:hover { color: var(--primary-blue); }

.article-detail h1 {
    font-size: clamp(26px, 3.5vw, 36px); font-weight: 800;
    margin-bottom: 16px; letter-spacing: -0.01em;
}

.article-detail .article-meta {
    display: flex; gap: 20px; font-size: 14px; color: var(--text-muted);
    padding-bottom: 24px; margin-bottom: 32px; border-bottom: 1px solid var(--border-color);
}

.article-detail .article-body { font-size: 16px; line-height: 1.85; color: var(--text-secondary); }
.article-detail .article-body h2 { font-size: 22px; font-weight: 700; color: var(--text-primary); margin: 32px 0 16px; }
.article-detail .article-body h3 { font-size: 18px; font-weight: 600; color: var(--text-primary); margin: 24px 0 12px; }
.article-detail .article-body p { margin-bottom: 20px; }
.article-detail .article-body ul, .article-detail .article-body ol { margin: 0 0 20px 20px; }
.article-detail .article-body li { margin-bottom: 8px; }
.article-detail .article-body strong { color: var(--text-primary); }

/* Article Sidebar */
.article-nav {
    display: flex; justify-content: space-between; gap: 24px;
    margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border-color);
}
.article-nav-item {
    flex: 1; padding: 20px 24px; background: var(--bg-light);
    border-radius: var(--radius-sm); transition: all 0.2s;
}
.article-nav-item:hover { background: rgba(30, 111, 255, 0.04); }
.article-nav-item .nav-label { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.article-nav-item .nav-title { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.article-nav-item.next { text-align: right; }

/* ===== About Page ===== */
.about-section { padding: 80px 0; }

.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }

.about-text h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 700; margin-bottom: 24px; }
.about-text .lead { font-size: 17px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; }

.about-quote {
    margin-top: 28px; padding: 24px 28px;
    background: linear-gradient(135deg, rgba(30, 111, 255, 0.05), rgba(16, 185, 129, 0.04));
    border-radius: var(--radius); border-left: 4px solid var(--primary-blue);
    font-size: 15px; color: var(--text-secondary); line-height: 1.8;
}

.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.stat-card {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 32px 24px; text-align: center; transition: all 0.3s;
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.stat-card .num { font-size: 40px; font-weight: 800; line-height: 1; margin-bottom: 8px; }
.stat-card:nth-child(1) .num { color: var(--primary-blue); }
.stat-card:nth-child(2) .num { color: var(--accent-orange); }
.stat-card:nth-child(3) .num { color: var(--accent-green); }
.stat-card:nth-child(4) .num { color: var(--primary-blue); }
.stat-card .label { font-size: 14px; color: var(--text-muted); }

/* Values */
.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.value-item {
    background: var(--bg-white); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 32px; transition: all 0.3s;
}
.value-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.value-item .icon {
    width: 48px; height: 48px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; margin-bottom: 16px;
    background: rgba(30, 111, 255, 0.1);
}
.value-item:nth-child(2) .icon { background: rgba(255, 107, 53, 0.1); }
.value-item:nth-child(3) .icon { background: rgba(16, 185, 129, 0.1); }
.value-item h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.value-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ===== Footer ===== */
footer { border-top: 1px solid var(--border-color); padding: 40px 0; background: var(--bg-light); }
.footer-content { display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }
.footer-logo { display: flex; align-items: center; height: 40px; }
.footer-logo img { height: 40px; }
.footer-links { display: flex; gap: 24px; list-style: none; flex-wrap: wrap; justify-content: center; }
.footer-links a { color: var(--text-muted); font-size: 14px; transition: color 0.2s; }
.footer-links a:hover { color: var(--primary-blue); }
.footer-copy { color: var(--text-muted); font-size: 13px; }
.footer-icp { margin: 0; }
.footer-icp a { color: var(--text-muted); font-size: 12px; text-decoration: none; transition: color 0.2s; }
.footer-icp a:hover { color: var(--primary-blue); }

/* ===== Animations ===== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .about-content, .contact-content { grid-template-columns: 1fr; gap: 40px; }
    .about-stats { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none; position: absolute; top: 100%; left: 0; width: 100%;
        background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
        flex-direction: column; padding: 20px; gap: 16px; border-bottom: 1px solid var(--border-color);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .nav-cta { display: none; }
    section { padding: 52px 0; }
    .hero { padding: 120px 0 56px; }
    .platform-list { gap: 24px; }
    .contact-form { padding: 28px 24px; }
}

/* ============================================================
 * GEO 客户端登录按钮 & 登录弹窗
 * ============================================================ */
.geo-login-btn {
    margin-left: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--primary-blue);
    border: 1.5px solid var(--primary-blue);
    font-size: 14px; font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}
.geo-login-btn:hover {
    background: var(--primary-blue);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(30, 111, 255, 0.3);
}
.geo-login-btn.logged {
    background: rgba(16, 185, 129, 0.1);
    border-color: #10b981;
    color: #059669;
}
.geo-login-btn.logged:hover {
    background: #10b981;
    color: #fff;
}

/* 弹窗遮罩 */
.geo-login-mask {
    position: fixed; inset: 0; z-index: 100000;
    display: flex; align-items: center; justify-content: center;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
    padding: 20px;
    animation: geoFadeIn 0.25s ease;
}

/* 弹窗主体 */
.geo-login-modal {
    width: 100%; max-width: 420px;
    background: #fff; border-radius: 16px;
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.3);
    padding: 36px 32px 28px;
    position: relative;
    animation: geoPopIn 0.3s cubic-bezier(0.2, 0.9, 0.3, 1.2);
}
.geo-login-close {
    position: absolute; top: 14px; right: 16px;
    border: none; background: none; cursor: pointer;
    font-size: 26px; line-height: 1; color: #94a3b8;
    padding: 4px; transition: color 0.2s, transform 0.2s;
}
.geo-login-close:hover { color: #334155; transform: rotate(90deg); }

.geo-login-head { text-align: center; margin-bottom: 24px; }
.geo-login-logo {
    width: 88px; height: 88px; object-fit: contain; margin: 0 auto 14px;
    border-radius: 14px;
}
.geo-login-head h3 { font-size: 20px; color: #0f172a; margin: 0 0 6px; font-weight: 700; }
.geo-login-sub { font-size: 13px; color: #64748b; margin: 0; }

.geo-login-form { display: flex; flex-direction: column; gap: 16px; }
.geo-login-field { display: flex; flex-direction: column; gap: 6px; }
.geo-login-field label { font-size: 13px; font-weight: 600; color: #334155; }
.geo-login-field input {
    padding: 12px 14px;
    border: 1.5px solid #e2e8f0; border-radius: 10px;
    font-size: 14px; color: #0f172a;
    outline: none; transition: border-color 0.2s, box-shadow 0.2s;
    background: #f8fafc;
}
.geo-login-field input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(30, 111, 255, 0.15);
    background: #fff;
}

.geo-login-msg {
    min-height: 20px; font-size: 13px; text-align: center;
    color: #64748b; margin: -4px 0;
}
.geo-login-msg.error { color: #dc2626; }
.geo-login-msg.ok { color: #059669; }

.geo-login-submit {
    padding: 13px; border: none; border-radius: 10px;
    background: linear-gradient(135deg, #1e6fff, #3b82f6);
    color: #fff; font-size: 15px; font-weight: 700;
    cursor: pointer; transition: all 0.2s;
    box-shadow: 0 6px 16px rgba(30, 111, 255, 0.3);
}
.geo-login-submit:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(30, 111, 255, 0.4); }
.geo-login-submit:disabled { opacity: 0.65; cursor: not-allowed; transform: none; }

.geo-login-foot {
    margin-top: 20px; text-align: center;
    font-size: 13px; color: #64748b;
}
.geo-login-foot a.geo-login-contact {
    color: var(--primary-blue); font-weight: 600;
    text-decoration: none; margin-left: 4px;
}
.geo-login-foot a.geo-login-contact:hover { text-decoration: underline; }

@keyframes geoFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes geoPopIn {
    from { opacity: 0; transform: scale(0.92) translateY(12px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* 移动端适配 */
@media (max-width: 768px) {
    .geo-login-btn { margin-left: 8px; padding: 8px 14px; font-size: 13px; }
    .geo-login-modal { padding: 28px 22px 22px; }
}