/* ========== 全局变量与基础样式 ========== */
:root {
    --primary: #1a56db;
    --primary-dark: #1e429f;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --success: #10b981;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--dark-2);
    background: #fff;
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

/* ========== 通用 Section ========== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.section-title {
    font-size: 42px;
    font-weight: 900;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 17px;
    color: var(--gray-500);
    max-width: 640px;
    margin: 0 auto;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(26, 86, 219, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow);
    background: rgba(255,255,255,0.95);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 88px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 900;
    color: var(--dark);
}

.logo-img {
    height: 68px;
    width: auto;
    display: block;
    object-fit: contain;
    max-height: 76px;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    color: #fff;
}

.logo-icon svg {
    width: 22px;
    height: 22px;
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    position: relative;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--dark);
    transition: var(--transition);
}

/* ========== Hero 区域 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
    background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(26,86,219,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(26,86,219,0.04) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.hero-glow {
    position: absolute;
    top: -200px;
    right: -200px;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(6,182,212,0.15), transparent 60%);
    border-radius: 50%;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(26,86,219,0.1);
    color: var(--primary);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 28px;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-size: 54px;
    font-weight: 900;
    line-height: 1.2;
    color: var(--dark);
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 18px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 540px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 56px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-num {
    font-size: 38px;
    font-weight: 900;
    color: var(--dark);
    line-height: 1;
}

.stat-num::after {
    content: '+';
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--gray-500);
    margin-top: 8px;
}

/* Hero 可视化 */
.hero-visual {
    position: relative;
    height: 520px;
}

.visual-card {
    position: absolute;
    background: #fff;
    border-radius: 16px;
    padding: 20px 24px;
    box-shadow: var(--shadow-lg);
    width: 220px;
    transition: var(--transition);
}

.visual-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.visual-card-1 {
    top: 20px;
    left: 20px;
    animation: float 4s ease-in-out infinite;
}

.visual-card-2 {
    top: 180px;
    right: 0;
    animation: float 4s ease-in-out infinite 0.5s;
}

.visual-card-3 {
    bottom: 40px;
    left: 60px;
    animation: float 4s ease-in-out infinite 1s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.vc-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.vc-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}

.vc-bar {
    height: 6px;
    background: var(--gray-100);
    border-radius: 3px;
    overflow: hidden;
}

.vc-bar span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
}

.visual-orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    border: 2px dashed rgba(26,86,219,0.15);
    border-radius: 50%;
    animation: spin 30s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-hint span {
    display: block;
    width: 28px;
    height: 44px;
    border: 2px solid var(--gray-300);
    border-radius: 14px;
    position: relative;
}

.scroll-hint span::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--gray-400);
    border-radius: 2px;
    animation: scrollDown 1.8s infinite;
}

@keyframes scrollDown {
    0% { opacity: 1; transform: translate(-50%, 0); }
    100% { opacity: 0; transform: translate(-50%, 16px); }
}

/* ========== 关于我们 ========== */
.about {
    background: #fff;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--gray-600);
    margin-bottom: 16px;
    font-size: 16px;
    line-height: 1.9;
}

.about-text p strong {
    color: var(--primary);
    font-weight: 600;
}

.about-lead {
    font-size: 17px !important;
    line-height: 1.9 !important;
    color: var(--gray-700) !important;
    padding-left: 14px;
    border-left: 3px solid var(--primary);
}

.about-features {
    margin-top: 28px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    color: var(--gray-700);
}

.check {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background: var(--success);
    color: #fff;
    border-radius: 50%;
    font-size: 13px;
    flex-shrink: 0;
}

.about-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-lg);
    padding: 40px;
    color: #fff;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    box-shadow: var(--shadow-xl);
}

.ac-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ac-icon {
    font-size: 32px;
}

.ac-num {
    font-size: 32px;
    font-weight: 900;
    line-height: 1;
}

.ac-text {
    font-size: 14px;
    opacity: 0.85;
    margin-top: 4px;
}

/* ========== 核心业务 ========== */
.services {
    background: var(--gray-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.sub-category-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin: 40px 0 24px;
    padding-left: 14px;
    border-left: 4px solid var(--primary);
}

.software-consulting {
    margin-top: 48px;
}

.sw-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.sw-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 24px 20px;
    text-align: center;
    transition: var(--transition);
}

.sw-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.sw-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.sw-card h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.sw-card p {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.6;
}

.service-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card.featured {
    border: 2px solid var(--primary);
}

.service-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 100px;
}

.service-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--primary);
    background: rgba(26,86,219,0.1);
}

.service-icon svg {
    width: 36px;
    height: 36px;
}

.icon-lopa {
    color: var(--accent);
    background: rgba(6,182,212,0.1);
}

.icon-qra {
    color: #8b5cf6;
    background: rgba(139,92,246,0.1);
}

.icon-sil {
    color: #f59e0b;
    background: rgba(245,158,11,0.1);
}

.icon-fire {
    color: #ef4444;
    background: rgba(239,68,68,0.1);
}

.icon-rbi {
    color: #10b981;
    background: rgba(16,185,129,0.1);
}

.icon-eer {
    color: #8b5cf6;
    background: rgba(139,92,246,0.1);
}

.icon-probe {
    color: #f59e0b;
    background: rgba(245,158,11,0.1);
}

.icon-dust {
    color: #d97706;
    background: rgba(217,119,6,0.1);
}

.service-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.service-en {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 16px;
    font-style: italic;
}

.service-desc {
    color: var(--gray-600);
    font-size: 15px;
    margin-bottom: 24px;
    line-height: 1.7;
}

.service-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.service-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--gray-700);
}

.service-list li::before {
    content: '▸';
    color: var(--primary);
    font-weight: 700;
}

/* ========== 软件产品 ========== */
.software {
    background: #fff;
}

.platform-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 56px;
}

.plat-card {
    background: linear-gradient(135deg, var(--gray-50) 0%, #fff 100%);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    text-align: center;
    transition: var(--transition);
}

.plat-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.plat-logo-wrap {
    height: 110px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.plat-logo {
    max-height: 100px;
    max-width: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
}

.plat-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.plat-url {
    font-size: 14px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 16px;
}

.plat-desc {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 20px;
}

.plat-link {
    display: inline-block;
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
}

.plat-link:hover {
    color: var(--primary-dark);
    letter-spacing: 0.5px;
}

.ttoz-detail {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--gray-200);
}

.ttoz-detail-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}

.ttoz-mini-logo {
    height: 28px;
    width: auto;
}

.ttoz-detail-header h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
}

.ttoz-summary {
    color: var(--gray-600);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.ttoz-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.ttoz-tag {
    display: inline-block;
    padding: 6px 16px;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
}

.ttoz-tag:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.module-group {
    margin-bottom: 40px;
}

.module-group:last-child {
    margin-bottom: 0;
}

.module-group-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.module-group-title h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 0 4px rgba(16,185,129,0.15);
}

.status-dot.soon {
    background: var(--gray-400);
    box-shadow: 0 0 0 4px rgba(148,163,184,0.15);
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.module-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    transition: var(--transition);
}

.module-card.online {
    background: #fff;
    border-color: var(--gray-200);
}

.module-card.online:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--primary);
}

.module-card.soon {
    opacity: 0.55;
}

.module-card.soon:hover {
    opacity: 0.75;
}

.module-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gray-200);
    color: var(--gray-500);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    margin: 0 auto 14px;
}

.module-card.online .module-icon.icon-h {
    background: rgba(16,185,129,0.12);
    color: var(--success);
}

.module-card.online .module-icon.icon-proj {
    background: rgba(26,86,219,0.12);
    color: var(--primary);
}

.module-card.online .module-icon.icon-lib {
    background: rgba(139,92,246,0.12);
    color: #8b5cf6;
}

.module-card.online .module-icon.icon-matrix {
    background: rgba(245,158,11,0.12);
    color: #f59e0b;
}

.module-card h5 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.module-card p {
    font-size: 13px;
    color: var(--gray-500);
}

.module-card.soon h5 {
    color: var(--gray-500);
}

/* ========== 核心优势 ========== */
.advantages {
    background: var(--gray-50);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.adv-item {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.adv-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.adv-num {
    font-size: 48px;
    font-weight: 900;
    color: var(--gray-100);
    line-height: 1;
    margin-bottom: 16px;
    transition: var(--transition);
}

.adv-item:hover .adv-num {
    color: var(--primary-light);
}

.adv-item h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.adv-item p {
    color: var(--gray-600);
    font-size: 15px;
    line-height: 1.7;
}

/* ========== 资质证书 ========== */
.certificates {
    background: var(--gray-50);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.cert-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    text-align: center;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.cert-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.cert-icon {
    font-size: 42px;
    margin-bottom: 16px;
}

.cert-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.cert-desc {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 16px;
}

.cert-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
}

.cert-tags span {
    padding: 4px 12px;
    background: rgba(26,86,219,0.08);
    color: var(--primary);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
}

.cert-iso .cert-tags span { background: rgba(16,185,129,0.1); color: var(--success); }
.cert-patent .cert-tags span { background: rgba(245,158,11,0.1); color: #f59e0b; }
.cert-soft .cert-tags span { background: rgba(139,92,246,0.1); color: #8b5cf6; }

/* ========== 服务流程 ========== */
.process {
    background: #fff;
}

.process-flow {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 180px;
    text-align: center;
}

.step-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 8px 20px rgba(26,86,219,0.3);
}

.step h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.step p {
    font-size: 14px;
    color: var(--gray-500);
    max-width: 160px;
    margin: 0 auto;
}

.step-arrow {
    font-size: 28px;
    color: var(--gray-300);
    margin-top: 16px;
    flex-shrink: 0;
}

/* ========== 联系我们 ========== */
.contact {
    background: linear-gradient(180deg, var(--gray-50) 0%, #fff 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    max-width: 1100px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    background: #fff;
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.contact-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.ci-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(26,86,219,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.contact-item p {
    color: var(--gray-600);
    font-size: 15px;
}

.contact-form {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-100);
}

.contact-form h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.form-hint {
    color: var(--gray-500);
    font-size: 14px;
    margin-bottom: 28px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--gray-200);
    border-radius: 10px;
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--gray-50);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-success,
.form-error {
    display: none;
    margin-top: 20px;
    padding: 14px;
    border-radius: 10px;
    text-align: center;
    font-weight: 600;
}

.form-success {
    background: rgba(16,185,129,0.1);
    color: var(--success);
}

.form-error {
    background: rgba(239,68,68,0.1);
    color: var(--danger);
}

.form-success.show,
.form-error.show {
    display: block;
    animation: fadeIn 0.4s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== 页脚 ========== */
.footer {
    background: var(--dark);
    color: var(--gray-300);
    padding: 72px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 900;
    color: #fff;
    margin-bottom: 16px;
}

.footer-logo-img {
    height: 60px;
    width: auto;
    display: block;
    object-fit: contain;
    background: #fff;
    padding: 6px 14px;
    border-radius: 8px;
}

.footer-logo .logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-logo .logo-icon svg {
    width: 22px;
    height: 22px;
    color: #fff;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    color: var(--gray-400);
    max-width: 320px;
}

.footer-col h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul a {
    color: var(--gray-400);
    font-size: 14px;
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--accent-light);
    padding-left: 4px;
}

.footer-contact li {
    font-size: 14px;
    color: var(--gray-400);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding: 24px 0;
    text-align: center;
    font-size: 14px;
    color: var(--gray-500);
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border: none;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(26,86,219,0.4);
}

/* ========== 滚动动画 ========== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .hero-content,
    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-right {
        order: -1;
    }

    .hero-visual {
        height: 420px;
        max-width: 500px;
        margin: 0 auto;
    }

    .services-grid,
    .adv-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .sw-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cert-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }

    .section-title {
        font-size: 30px;
    }

    .nav-links {
        position: fixed;
        top: 88px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .hero-stats {
        gap: 28px;
    }

    .stat-num {
        font-size: 28px;
    }

    .hero-visual {
        height: 360px;
    }

    .visual-card {
        width: 180px;
        padding: 16px;
    }

    .platform-cards {
        grid-template-columns: 1fr;
    }

    .services-grid,
    .adv-grid,
    .software-grid,
    .cert-grid,
    .sw-grid {
        grid-template-columns: 1fr;
    }

    .platform-main {
        flex-direction: column;
        text-align: center;
        padding: 28px 24px;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .about-card {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 28px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .contact-form {
        padding: 28px;
    }

    .process-flow {
        flex-direction: column;
        align-items: center;
        gap: 0;
    }

    .step-arrow {
        transform: rotate(90deg);
        margin: 8px 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 30px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .hero-stats {
        gap: 20px;
    }
}