/* ========================================
   波放契软件 - 企业官网 v5
   现代专业风格：融合商务、科技、清爽设计
   ======================================== */

:root {
    --bg: #f7f8fa;
    --surface: #ffffff;
    --surface-2: #f0f2f5;
    --border: #e4e7eb;
    --border-2: #c9cfd6;
    --text: #111827;
    --text-2: #4b5563;
    --text-3: #9ca3af;
    --accent: #2563eb;
    --accent-2: #3b82f6;
    --accent-dim: rgba(37,99,235,0.06);
    --accent-glow: rgba(37,99,235,0.12);
    --radius: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text-2);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 40px; position: relative; z-index: 1; }

/* ===== 导航 ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    height: 64px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex; align-items: center; gap: 10px;
    color: var(--text); font-weight: 800; font-size: 1.05rem;
    text-decoration: none;
    letter-spacing: -0.3px;
}

.logo-dot {
    width: 8px; height: 8px;
    background: var(--accent);
    border-radius: 50%;
    display: inline-block;
}

.logo-text { font-weight: 800; font-size: 1.05rem; color: var(--text); }

.nav-links { display: flex; gap: 8px; align-items: center; }

.nav-links a {
    font-size: 0.84rem; font-weight: 500;
    color: var(--text-2); text-decoration: none;
    padding: 6px 14px;
    border-radius: 6px;
    transition: all 0.15s;
}
.nav-links a:hover { color: var(--accent); background: var(--accent-dim); }
.nav-links a.active { color: var(--accent); background: var(--accent-dim); font-weight: 600; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; }

/* ===== 进度条 ===== */
.progress-bar {
    position: fixed; top: 64px; left: 0; height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    z-index: 999; width: 0%; transition: width 0.15s;
}

/* ===== Hero ===== */
.hero {
    padding: 130px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        url(hero-image.jpg) center center / cover no-repeat;
    pointer-events: none;
    z-index: 0;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.35);
}

.hero-grid-pattern {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(37,99,235,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37,99,235,0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, black 0%, transparent 70%);
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    background: var(--accent-dim);
    border: 1px solid rgba(37,99,235,0.15);
    border-radius: 100px;
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 28px;
    letter-spacing: 0.3px;
}

.hero-badge::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
    font-size: 3.4rem;
    font-weight: 900;
    color: #ffffff;
    line-height: 1.12;
    letter-spacing: -1px;
    margin-bottom: 22px;
    position: relative;
}

.hero-title .line-2 {
    display: block;
    background: linear-gradient(135deg, #60a5fa, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.85);
    max-width: 560px;
    margin: 0 auto 32px;
    line-height: 1.9;
    font-weight: 400;
}

.hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    margin-top: 80px;
    padding-top: 48px;
    border-top: 1px solid var(--border);
}

.hero-stat-item { text-align: center; }

.hero-stat-num {
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent);
    letter-spacing: -1px;
    line-height: 1;
    margin-bottom: 4px;
}

.hero-stat-label {
    font-size: 0.78rem;
    color: var(--text-3);
    font-weight: 500;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex; align-items: center; gap: 7px;
    padding: 11px 26px;
    border-radius: var(--radius);
    font-size: 0.88rem; font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer; border: none;
    letter-spacing: 0.1px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    box-shadow: 0 4px 14px rgba(37,99,235,0.28);
}
.btn-primary:hover {
    opacity: 0.92;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.35);
}

.btn-outline {
    background: var(--surface);
    border: 1.5px solid var(--border-2);
    color: var(--text-2);
}
.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}

.btn-sm { padding: 8px 18px; font-size: 0.82rem; }

/* ===== 通用区块 ===== */
.section { padding: 100px 0; }

.section-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--text);
    margin-bottom: 14px;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.section-desc {
    font-size: 0.95rem;
    color: var(--text-2);
    max-width: 520px;
    margin: 0 auto 56px;
    line-height: 1.8;
}

.section-header { margin-bottom: 52px; }
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ===== 统计 ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    opacity: 0;
    transition: opacity 0.2s;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.stat-card:hover::before { opacity: 1; }

.stat-num {
    font-size: 2.6rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 8px;
    letter-spacing: -1.5px;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-3);
    font-weight: 500;
}

/* ===== 业务卡片 ===== */
.biz-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.biz-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: all 0.25s;
}

.biz-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(37,99,235,0.2);
}

.biz-icon {
    width: 56px; height: 56px;
    background: var(--accent-dim);
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px;
    color: var(--accent);
    transition: all 0.2s;
}

.biz-card:hover .biz-icon {
    background: var(--accent);
    color: #fff;
    transform: scale(1.05);
}

.biz-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}

.biz-card p {
    font-size: 0.85rem;
    color: var(--text-2);
    line-height: 1.7;
    margin-bottom: 16px;
}

.biz-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.biz-tags span {
    padding: 4px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-2);
    transition: all 0.15s;
}

.biz-card:hover .biz-tags span {
    border-color: var(--accent);
    color: var(--accent);
}

/* ===== 服务卡片 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.svc-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 36px 30px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.25s;
    position: relative;
}

.svc-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(37,99,235,0.2);
}

.svc-card.featured {
    background: linear-gradient(135deg, #1e3a5f 0%, #1a3a7a 100%);
    border-color: transparent;
    color: #fff;
}

.svc-card.featured h3,
.svc-card.featured p { color: #fff; }
.svc-card.featured .svc-icon-wrap { background: rgba(255,255,255,0.15); }

.svc-icon-wrap {
    width: 48px; height: 48px;
    background: var(--accent-dim);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px;
    transition: all 0.2s;
}

.svc-card:hover .svc-icon-wrap {
    background: var(--accent-glow);
    transform: scale(1.08);
}

.svc-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
    line-height: 1.4;
}

.svc-card p {
    font-size: 0.85rem;
    color: var(--text-2);
    line-height: 1.75;
}

/* ===== 步骤 ===== */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

.steps-grid::before {
    content: '';
    position: absolute;
    top: 32px;
    left: 60px;
    right: 60px;
    height: 1px;
    background: linear-gradient(90deg, var(--border), var(--accent), var(--border));
    z-index: 0;
}

.step-item {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    position: relative;
    z-index: 1;
    transition: all 0.2s;
}

.step-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.step-num {
    width: 44px; height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    font-size: 0.9rem;
    font-weight: 800;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 18px;
    box-shadow: 0 4px 14px rgba(37,99,235,0.25);
}

.step-item h4 {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.step-item p {
    font-size: 0.8rem;
    color: var(--text-3);
    line-height: 1.65;
}

/* ===== 优势 ===== */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.value-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px 26px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.value-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: rgba(37,99,235,0.15);
}

.value-icon {
    width: 48px; height: 48px;
    background: linear-gradient(135deg, var(--accent-dim), var(--accent-glow));
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px;
}

.value-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.value-card p {
    font-size: 0.83rem;
    color: var(--text-2);
    line-height: 1.75;
}

/* ===== 行业详情双列 ===== */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
    align-items: center;
    margin-bottom: 60px !important;
}

.detail-grid:last-child {
    margin-bottom: 0 !important;
}

.detail-grid .ind-content {
    padding: 8px 0;
}

.detail-grid h2 {
    font-size: 1.8rem !important;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 16px;
    letter-spacing: -0.3px;
}

.detail-grid p {
    font-size: 0.92rem;
    color: var(--text-2);
    line-height: 1.85;
    margin-bottom: 20px;
}

.detail-grid ul {
    list-style: none;
}

.detail-grid ul li {
    font-size: 0.85rem;
    color: var(--text-2);
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.detail-grid ul li:last-child {
    border-bottom: none;
}

.detail-grid ul li::before {
    content: '→';
    color: var(--accent);
    font-weight: 600;
    flex-shrink: 0;
}

.detail-grid img {
    width: 100%;
    height: 260px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* ===== 技术栈网格 ===== */
.stack-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* ===== 合作模式 ===== */
.mode-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.mode-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.25s;
    position: relative;
}

.mode-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--accent);
}

.mode-num {
    width: 48px; height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    font-size: 1rem;
    font-weight: 800;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 4px 14px rgba(37,99,235,0.25);
}

.mode-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.mode-card p {
    font-size: 0.85rem;
    color: var(--text-2);
    line-height: 1.75;
    margin: 0;
}

/* ===== 行业 ===== */
.industry-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.industry-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 30px 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
}

.industry-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    opacity: 0;
    transition: opacity 0.2s;
}

.industry-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: rgba(37,99,235,0.15);
}

.industry-card:hover::after { opacity: 1; }

.industry-icon {
    width: 44px; height: 44px;
    background: var(--accent-dim);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 16px;
    color: var(--accent);
}

.industry-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.industry-card p {
    font-size: 0.82rem;
    color: var(--text-2);
    line-height: 1.7;
}

/* ===== 案例 ===== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

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

.case-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.25s;
}

.case-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(37,99,235,0.15);
}

.case-img {
    width: 100%; height: 180px;
    background: linear-gradient(135deg, var(--surface-2), var(--bg));
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.case-img img { width: 100%; height: 100%; object-fit: cover; }

.case-body { padding: 22px 24px; }

.case-tag {
    display: inline-block;
    padding: 2px 10px;
    background: var(--accent-dim);
    color: var(--accent);
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.case-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
    line-height: 1.4;
}

.case-card p {
    font-size: 0.8rem;
    color: var(--text-2);
    line-height: 1.65;
}

/* ===== 关于 ===== */
.about-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 72px;
    align-items: start;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.about-feature {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.about-feature-icon {
    width: 36px; height: 36px;
    background: var(--accent-dim);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    color: var(--accent);
}

.about-feature h5 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 3px;
}

.about-feature p {
    font-size: 0.78rem;
    color: var(--text-3);
    line-height: 1.5;
    margin: 0;
}

.about-img {
    width: 100%; height: 380px;
    background: linear-gradient(135deg, var(--surface-2), var(--bg));
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
    border: 1px solid var(--border);
}
.about-img img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius-lg); }

.about-text p {
    font-size: 0.9rem;
    color: var(--text-2);
    margin-bottom: 16px;
    line-height: 1.85;
}

.about-list {
    list-style: none;
    margin: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.about-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.88rem;
    color: var(--text-2);
}

.about-list li::before {
    content: '✓';
    width: 20px; height: 20px;
    background: var(--accent-dim);
    color: var(--accent);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 52px;
}

.team-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 18px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.team-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: rgba(37,99,235,0.15);
}

.team-avatar {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-dim), var(--accent-glow));
    border: 2px solid rgba(37,99,235,0.1);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 14px;
    font-size: 1.3rem;
}

.team-card h4 {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 2px;
}

.team-card .role {
    font-size: 0.72rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 10px;
}

.team-card p {
    font-size: 0.75rem;
    color: var(--text-3);
    line-height: 1.55;
}

/* ===== 团队时间线 ===== */
.timeline {
    border-left: 2px solid var(--border);
    margin-left: 6px;
    padding-left: 32px;
}

.timeline-wrap {
    max-width: 680px;
    margin: 0 auto;
    position: relative;
    padding-left: 40px;
}

.timeline-wrap::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--border));
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
    position: absolute;
    left: -34px;
    top: 4px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 2px var(--accent);
}

.timeline-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.timeline-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.timeline-year {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.timeline-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.timeline-card p {
    font-size: 0.85rem;
    color: var(--text-2);
    line-height: 1.75;
    margin: 0;
}

.tl-item {
    position: relative;
    padding-bottom: 36px;
}
.tl-item:last-child { padding-bottom: 0; }

.tl-item::before {
    content: '';
    position: absolute;
    left: -38px; top: 4px;
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 2px var(--accent);
}

.tl-year {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
    font-family: monospace;
    letter-spacing: 1px;
}

.tl-item h4 {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.tl-item p {
    font-size: 0.82rem;
    color: var(--text-2);
    line-height: 1.7;
}

/* ===== 联系 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
}

.contact-icon {
    width: 44px; height: 44px;
    background: var(--accent-dim);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}

.contact-info-item h5 {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 3px;
}

.contact-info-item p { font-size: 0.84rem; color: var(--text-2); }

.contact-form {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-2);
    margin-bottom: 7px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-size: 0.88rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

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

/* ===== FAQ ===== */
.faq-list { max-width: 720px; margin: 0 auto; }

.faq-item { border-bottom: 1px solid var(--border); }

.faq-question {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text);
    gap: 16px;
    user-select: none;
}
.faq-question:hover { color: var(--accent); }

.faq-question .icon {
    width: 24px; height: 24px;
    border-radius: 50%;
    background: var(--accent-dim);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    transition: transform 0.2s;
    font-size: 0.75rem;
    color: var(--accent);
}

.faq-item.open .faq-question .icon { transform: rotate(45deg); }

.faq-answer {
    padding: 0 0 20px;
    font-size: 0.86rem;
    color: var(--text-2);
    line-height: 1.85;
    display: none;
}
.faq-item.open .faq-answer { display: block; }

/* ===== CTA ===== */
.cta-section {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #3b82f6 100%);
    border-radius: var(--radius-lg);
    padding: 72px 48px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 60%);
    pointer-events: none;
}

.cta-section h2 {
    font-size: 2rem;
    font-weight: 900;
    color: #fff;
    margin-bottom: 12px;
    position: relative;
}

.cta-section p {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.78);
    margin-bottom: 32px;
    position: relative;
}

.cta-section .btn-primary {
    background: #fff;
    color: var(--accent);
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
    position: relative;
}
.cta-section .btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

/* ===== 页脚 ===== */
.footer {
    background: #1a2332;
    border-top: 1px solid #2a3444;
    padding: 60px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 44px;
    border-bottom: 1px solid #2a3444;
}

.footer-brand .logo-text { color: #ffffff; }

.footer-brand p {
    font-size: 0.83rem;
    color: #8b95a5;
    margin-top: 14px;
    line-height: 1.8;
    max-width: 240px;
}

.footer-col h5 {
    font-size: 0.72rem;
    font-weight: 700;
    color: #d1d5db;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.footer-col a {
    display: block;
    font-size: 0.83rem;
    color: #8b95a5;
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.15s;
}
.footer-col a:hover { color: #60a5fa; }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 22px 0;
    font-size: 0.76rem;
    color: #6b7280;
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 28px; right: 28px;
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    text-decoration: none;
    font-size: 1rem;
    box-shadow: 0 4px 14px rgba(37,99,235,0.3);
    transition: all 0.2s;
    z-index: 999;
    opacity: 0;
    pointer-events: none;
}
.back-to-top.show { opacity: 1; pointer-events: auto; }
.back-to-top:hover { opacity: 0.85; transform: translateY(-3px); }

/* ===== 动画 ===== */
.fade-up {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== AI 页面 ===== */
.ai-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.ai-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px 26px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.25s;
}

.ai-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(37,99,235,0.2);
}

.ai-icon {
    width: 48px; height: 48px;
    background: var(--accent-dim);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px;
}

.ai-card h4 {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.ai-card p {
    font-size: 0.83rem;
    color: var(--text-2);
    line-height: 1.75;
}

.ai-card ul { list-style: none; margin-top: 14px; }

.ai-card ul li {
    font-size: 0.8rem;
    color: var(--text-2);
    padding: 5px 0 5px 18px;
    position: relative;
    border-bottom: 1px solid var(--border);
}
.ai-card ul li:last-child { border-bottom: none; }

.ai-card ul li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 0.75rem;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .container { padding: 0 32px; }
    .nav-container { padding: 0 32px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .values-grid { grid-template-columns: repeat(2, 1fr); }
    .industry-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid::before { display: none; }
    .about-block { grid-template-columns: 1fr; gap: 36px; }
    .contact-grid { grid-template-columns: 1fr; }
    .team-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-top { grid-template-columns: 1fr 1fr; }
    .hero-title { font-size: 2.6rem; }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .nav-container { padding: 0 20px; }
    .nav-links { display: none; }
    .nav-toggle { display: block; }
    .hero { padding: 130px 0 72px; }
    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .hero-stats { gap: 24px; flex-wrap: wrap; }
    .section { padding: 72px 0; }
    .section-title { font-size: 1.7rem; }
    .services-grid, .values-grid, .industry-grid, .cases-grid,
    .stats-grid, .steps-grid, .ai-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
    .form-row { grid-template-columns: 1fr; }
    .cta-section { padding: 48px 24px; }
    .cta-section h2 { font-size: 1.6rem; }
    .contact-form { padding: 28px 20px; }
    .about-img { height: 260px; }
    .team-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .about-block { gap: 28px; }
}