/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    /* 主色调 - 金融科技深蓝 */
    --navy-900: #050b1a;
    --navy-800: #0a1428;
    --navy-700: #0f1f3d;
    --navy-600: #16294f;
    --navy-500: #1e3a6b;
    --navy-400: #2a4d8a;

    /* 强调色 */
    --cyan: #00d4ff;
    --cyan-soft: #4de8ff;
    --blue: #2f7cff;
    --gold: #f5b800;
    --gold-soft: #ffd24d;

    /* 文字 */
    --text-light: #ffffff;
    --text-muted: #8aa0c2;
    --text-dark: #1a2540;
    --text-body: #4a5878;

    /* 背景 */
    --bg-light: #f7faff;
    --bg-card: #ffffff;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #2f7cff 100%);
    --gradient-gold: linear-gradient(135deg, #f5b800 0%, #ffd24d 100%);
    --gradient-hero: linear-gradient(135deg, #050b1a 0%, #0a1428 50%, #0f1f3d 100%);

    /* 阴影 */
    --shadow-sm: 0 4px 12px rgba(15, 31, 61, 0.08);
    --shadow-md: 0 10px 30px rgba(15, 31, 61, 0.12);
    --shadow-lg: 0 20px 60px rgba(15, 31, 61, 0.18);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.25);

    /* 圆角 */
    --r-sm: 8px;
    --r-md: 14px;
    --r-lg: 24px;
}
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: var(--text-body);
    background: var(--bg-light);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}
.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 212, 255, 0.5);
}
.btn-ghost {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
}
.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
}
.btn-block { width: 100%; }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
    background: transparent;
}
.navbar.scrolled {
    padding: 14px 0;
    background: rgba(5, 11, 26, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}
.logo-mark {
    width: 44px; height: 44px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.4);
    position: relative;
    overflow: hidden;
}
.logo-mark::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.25) 100%);
}
.logo-text {
    font-size: 22px;
    font-weight: 800;
    color: #fff;
    position: relative;
    z-index: 1;
}
.logo-info {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
.logo-name {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}
.logo-sub {
    font-size: 10px;
    color: var(--cyan);
    letter-spacing: 3px;
    font-weight: 600;
}
.nav-menu {
    display: flex;
    gap: 8px;
    align-items: center;
}
.nav-link {
    padding: 8px 18px;
    color: rgba(255, 255, 255, 0.75);
    font-size: 15px;
    font-weight: 500;
    border-radius: 50px;
    transition: all 0.25s ease;
    position: relative;
}
.nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.nav-link.active {
    color: var(--navy-900);
    background: var(--cyan);
    box-shadow: 0 4px 16px rgba(0, 212, 255, 0.4);
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.nav-toggle span {
    width: 24px; height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all 0.3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-hero);
    overflow: hidden;
    padding-top: 100px;
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: floatOrb 12s ease-in-out infinite;
}
.orb-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, #00d4ff 0%, transparent 70%);
    top: -100px; right: -100px;
}
.orb-2 {
    width: 450px; height: 450px;
    background: radial-gradient(circle, #2f7cff 0%, transparent 70%);
    bottom: -150px; left: -100px;
    animation-delay: -6s;
}
@keyframes floatOrb {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(40px, -40px); }
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 880px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 18px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 50px;
    color: var(--cyan-soft);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
}
.pulse-dot {
    width: 8px; height: 8px;
    background: var(--cyan);
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.7);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.7); }
    70% { box-shadow: 0 0 0 12px rgba(0, 212, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0); }
}
.hero-title {
    font-size: clamp(38px, 6vw, 72px);
    font-weight: 800;
    color: #fff;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 24px;
}
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}
.hero-desc {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 680px;
    margin-bottom: 40px;
    line-height: 1.8;
}
.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 70px;
    flex-wrap: wrap;
}
.hero-stats {
    display: flex;
    align-items: center;
    gap: 36px;
    padding: 28px 36px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--r-lg);
    backdrop-filter: blur(20px);
    max-width: fit-content;
}
.stat-num {
    font-size: 44px;
    font-weight: 800;
    color: #fff;
    line-height: 1;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
}
.stat-divider {
    width: 1px;
    height: 50px;
    background: rgba(255, 255, 255, 0.12);
}
.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.4);
    font-size: 11px;
    letter-spacing: 2px;
    z-index: 2;
}
.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--cyan), transparent);
    position: relative;
    overflow: hidden;
}
.scroll-line::after {
    content: '';
    position: absolute;
    top: -40px;
    left: 0;
    width: 100%;
    height: 40px;
    background: var(--cyan);
    animation: scrollDown 2s ease-in-out infinite;
}
@keyframes scrollDown {
    0% { top: -40px; }
    100% { top: 40px; }
}

/* ===== 通用 Section ===== */
.section {
    padding: 110px 0;
    position: relative;
}
.section-dark {
    background: var(--navy-900);
    color: var(--text-muted);
}
.section-bg-deco {
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 100%;
    background:
        radial-gradient(circle at 20% 20%, rgba(0, 212, 255, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(47, 124, 255, 0.08) 0%, transparent 40%);
    pointer-events: none;
}
.section-head {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 70px;
}
.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    color: var(--blue);
    letter-spacing: 4px;
    margin-bottom: 16px;
    padding: 6px 16px;
    background: rgba(47, 124, 255, 0.1);
    border-radius: 50px;
}
.section-dark .section-tag {
    color: var(--cyan);
    background: rgba(0, 212, 255, 0.1);
}
.section-title {
    font-size: clamp(30px, 4vw, 44px);
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 18px;
    letter-spacing: -0.5px;
}
.section-head-light .section-title { color: #fff; }
.section-desc {
    font-size: 17px;
    color: var(--text-body);
    line-height: 1.7;
}
.section-head-light .section-desc { color: var(--text-muted); }

/* ===== 关于我们 ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.about-card {
    padding: 36px 28px;
    background: var(--bg-card);
    border-radius: var(--r-lg);
    border: 1px solid rgba(15, 31, 61, 0.06);
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}
.about-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}
.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}
.about-card:hover::before { transform: scaleX(1); }
.about-icon {
    width: 60px; height: 60px;
    background: linear-gradient(135deg, rgba(0,212,255,0.12), rgba(47,124,255,0.12));
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue);
    margin-bottom: 22px;
}
.about-icon svg { width: 30px; height: 30px; }
.about-card h3 {
    font-size: 19px;
    color: var(--text-dark);
    margin-bottom: 12px;
    font-weight: 700;
}
.about-card p {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.75;
}

/* ===== MCS 平台 ===== */
.platform-overview {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
    padding: 50px;
    background: linear-gradient(135deg, rgba(0,212,255,0.06), rgba(47,124,255,0.04));
    border: 1px solid rgba(0, 212, 255, 0.15);
    border-radius: var(--r-lg);
    position: relative;
    overflow: hidden;
}
.overview-badge {
    display: inline-block;
    padding: 6px 14px;
    background: var(--gradient-gold);
    color: #4a3000;
    font-size: 12px;
    font-weight: 700;
    border-radius: 50px;
    margin-bottom: 18px;
}
.overview-left h3 {
    font-size: 26px;
    color: #fff;
    margin-bottom: 18px;
    font-weight: 700;
}
.overview-left > p {
    color: var(--text-muted);
    margin-bottom: 24px;
    line-height: 1.8;
}
.overview-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    margin-bottom: 14px;
}
.check {
    width: 22px; height: 22px;
    background: rgba(0, 212, 255, 0.15);
    color: var(--cyan);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}
.platform-visual {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    max-width: 400px;
    margin: 0 auto;
}
.pv-ring {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 1px dashed rgba(0, 212, 255, 0.3);
}
.pv-ring-1 { width: 100%; height: 100%; animation: rotateRing 30s linear infinite; }
.pv-ring-2 { width: 75%; height: 75%; animation: rotateRing 20s linear infinite reverse; border-style: solid; border-color: rgba(0, 212, 255, 0.15); }
.pv-ring-3 { width: 50%; height: 50%; border-color: rgba(0, 212, 255, 0.2); }
@keyframes rotateRing {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}
.pv-core {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 110px; height: 110px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 50px rgba(0, 212, 255, 0.6);
    animation: corePulse 3s ease-in-out infinite;
}
.pv-core span {
    font-size: 26px;
    font-weight: 800;
    color: #fff;
    letter-spacing: 1px;
}
.pv-core small {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.85);
    margin-top: 2px;
    letter-spacing: 2px;
}
@keyframes corePulse {
    0%, 100% { box-shadow: 0 0 50px rgba(0, 212, 255, 0.6); }
    50% { box-shadow: 0 0 70px rgba(0, 212, 255, 0.9); }
}
.pv-node {
    position: absolute;
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 50px;
    font-size: 12px;
    color: var(--cyan-soft);
    font-weight: 600;
    backdrop-filter: blur(10px);
    white-space: nowrap;
}
.pv-node-1 { top: 0; left: 50%; transform: translateX(-50%); }
.pv-node-2 { top: 50%; right: 0; transform: translateY(-50%); }
.pv-node-3 { bottom: 0; left: 50%; transform: translateX(-50%); }
.pv-node-4 { top: 50%; left: 0; transform: translateY(-50%); }
.pv-node-5 { top: 18%; right: 18%; }
.pv-node-6 { bottom: 18%; left: 18%; }

/* 功能特性 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 80px;
}
.feature-card {
    padding: 32px 28px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--r-lg);
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}
.feature-card:hover {
    background: rgba(0, 212, 255, 0.05);
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateY(-6px);
}
.feature-num {
    font-size: 40px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 18px;
    opacity: 0.85;
}
.feature-card h4 {
    font-size: 19px;
    color: #fff;
    margin-bottom: 12px;
    font-weight: 700;
}
.feature-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.75;
}

/* 架构层次 */
.arch-wrap {
    padding: 40px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--r-lg);
}
.arch-title {
    text-align: center;
    font-size: 22px;
    color: #fff;
    margin-bottom: 32px;
    font-weight: 700;
}
.arch-layers {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.arch-layer {
    display: flex;
    align-items: stretch;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--r-md);
    overflow: hidden;
}
.layer-label {
    flex-shrink: 0;
    width: 140px;
    padding: 20px;
    background: rgba(0, 212, 255, 0.08);
    color: var(--cyan-soft);
    font-weight: 700;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}
.arch-layer-accent {
    background: rgba(0, 212, 255, 0.08);
    border-color: rgba(0, 212, 255, 0.3);
}
.arch-layer-accent .layer-label {
    background: var(--gradient-primary);
    color: #fff;
}
.layer-content {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 16px 20px;
    align-items: center;
}
.layer-content span {
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.08);
}
.arch-layer-accent .layer-content span {
    background: rgba(0, 212, 255, 0.12);
    border-color: rgba(0, 212, 255, 0.25);
    color: var(--cyan-soft);
}

/* ===== 团队介绍 ===== */
.team-highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 70px;
}
.th-item {
    text-align: center;
    padding: 40px 24px;
    background: var(--bg-card);
    border-radius: var(--r-lg);
    border: 1px solid rgba(15, 31, 61, 0.06);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.th-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}
.th-item:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.th-num {
    font-size: 52px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    position: relative;
    z-index: 1;
}
.th-num sup {
    font-size: 26px;
    vertical-align: super;
}
.th-text {
    font-size: 14px;
    color: var(--text-body);
    margin-top: 12px;
    line-height: 1.5;
    position: relative;
    z-index: 1;
}
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 70px;
}
.team-card {
    text-align: center;
    padding: 36px 24px;
    background: var(--bg-card);
    border-radius: var(--r-lg);
    border: 1px solid rgba(15, 31, 61, 0.06);
    transition: all 0.35s ease;
}
.team-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0, 212, 255, 0.3);
}
.team-avatar {
    width: 96px; height: 96px;
    margin: 0 auto 22px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.avatar-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--cyan), var(--blue), var(--cyan));
    animation: rotateRing 6s linear infinite;
    padding: 3px;
}
.avatar-ring::after {
    content: '';
    position: absolute;
    inset: 3px;
    background: var(--navy-700);
    border-radius: 50%;
}
.avatar-text {
    position: relative;
    z-index: 1;
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.team-card h4 {
    font-size: 20px;
    color: var(--text-dark);
    margin-bottom: 6px;
    font-weight: 700;
}
.team-role {
    font-size: 14px;
    color: var(--blue);
    font-weight: 600;
    margin-bottom: 14px;
}
.team-bio {
    font-size: 13px;
    color: var(--text-body);
    line-height: 1.75;
    margin-bottom: 18px;
}
.team-tags {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}
.team-tags span {
    padding: 5px 12px;
    background: rgba(47, 124, 255, 0.08);
    color: var(--blue);
    font-size: 12px;
    border-radius: 50px;
    font-weight: 500;
}
.team-advantages {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 50px;
    background: linear-gradient(135deg, var(--navy-900), var(--navy-700));
    border-radius: var(--r-lg);
    position: relative;
    overflow: hidden;
}
.team-advantages::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(47, 124, 255, 0.1) 0%, transparent 50%);
}
.ta-item {
    text-align: center;
    position: relative;
    z-index: 1;
}
.ta-icon {
    width: 56px; height: 56px;
    margin: 0 auto 18px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
}
.ta-icon svg { width: 26px; height: 26px; }
.ta-item h4 {
    font-size: 17px;
    color: #fff;
    margin-bottom: 10px;
    font-weight: 700;
}
.ta-item p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ===== 联系我们 ===== */
.section-contact {
    background:
        radial-gradient(circle at 0% 0%, rgba(0, 212, 255, 0.04) 0%, transparent 40%),
        var(--bg-light);
}
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
    align-items: stretch;
}
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.ci-item {
    display: flex;
    gap: 18px;
    padding: 28px;
    background: var(--bg-card);
    border-radius: var(--r-lg);
    border: 1px solid rgba(15, 31, 61, 0.06);
    transition: all 0.3s ease;
}
.ci-item:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 212, 255, 0.2);
}
.ci-icon {
    flex-shrink: 0;
    width: 52px; height: 52px;
    background: linear-gradient(135deg, rgba(0,212,255,0.12), rgba(47,124,255,0.12));
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue);
}
.ci-icon svg { width: 24px; height: 24px; }
.ci-content h4 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 6px;
    font-weight: 700;
}
.ci-content p {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.7;
}
.contact-form-wrap {
    background: var(--bg-card);
    border-radius: var(--r-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(15, 31, 61, 0.06);
}
.form-title {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}
.form-sub {
    font-size: 14px;
    color: var(--text-body);
    margin-bottom: 28px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 600;
}
.form-group label span { color: #e74c3c; }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid rgba(15, 31, 61, 0.12);
    border-radius: var(--r-sm);
    font-size: 14px;
    font-family: inherit;
    color: var(--text-dark);
    background: var(--bg-light);
    transition: all 0.25s ease;
    resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--cyan);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.1);
}
.form-tip {
    margin-top: 14px;
    font-size: 14px;
    text-align: center;
    min-height: 22px;
}
.form-tip.success { color: #27ae60; }
.form-tip.error { color: #e74c3c; }

/* ===== 页脚 ===== */
.footer {
    background: var(--navy-900);
    color: var(--text-muted);
    padding: 70px 0 30px;
    position: relative;
    overflow: hidden;
}
.footer::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}
.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.3fr;
    gap: 50px;
    margin-bottom: 50px;
}
.footer-brand .logo { margin-bottom: 20px; }
.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-muted);
    max-width: 320px;
}
.footer-col h5 {
    font-size: 15px;
    color: #fff;
    margin-bottom: 18px;
    font-weight: 700;
}
.footer-col a,
.footer-col p {
    display: block;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 12px;
    transition: color 0.2s ease;
}
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

/* ===== 滚动显示动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .about-grid,
    .features-grid,
    .team-grid,
    .team-highlights,
    .team-advantages {
        grid-template-columns: repeat(2, 1fr);
    }
    .platform-overview {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 36px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .footer-main {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }
}
@media (max-width: 768px) {
    .section { padding: 80px 0; }
    .nav-menu {
        position: fixed;
        top: 70px; left: 0; right: 0;
        flex-direction: column;
        background: rgba(5, 11, 26, 0.97);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 4px;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .nav-menu.active { transform: translateY(0); }
    .nav-link { width: 100%; text-align: center; }
    .nav-toggle { display: flex; }

    .hero { padding-top: 120px; min-height: auto; padding-bottom: 60px; }
    .hero-stats {
        flex-direction: column;
        gap: 20px;
        align-items: flex-start;
        padding: 24px;
        max-width: 100%;
    }
    .stat-divider { width: 100%; height: 1px; }
    .stat-num { font-size: 36px; }
    .hero-actions .btn { flex: 1; }
    .scroll-hint { display: none; }

    .about-grid,
    .features-grid,
    .team-grid,
    .team-highlights,
    .team-advantages {
        grid-template-columns: 1fr;
    }
    .team-advantages { padding: 30px 20px; }
    .platform-overview { padding: 28px 20px; }
    .arch-wrap { padding: 24px 16px; }
    .arch-layer { flex-direction: column; }
    .layer-label { width: 100%; padding: 14px; border-right: none; border-bottom: 1px solid rgba(255,255,255,0.08); }
    .layer-content { padding: 14px; }
    .contact-form-wrap { padding: 28px 20px; }
    .form-row { grid-template-columns: 1fr; gap: 0; }
    .footer-main { grid-template-columns: 1fr; gap: 30px; }
    .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-title { font-size: 36px; }
    .section-title { font-size: 28px; }
    .logo-info { display: none; }
}