/* ============================================================
   越领网络 - 官网样式 v2
   成都市越领网络科技有限公司
   智能穿戴 IoT SaaS 平台 & 一站式解决方案提供商
   ============================================================ */

/* ===== CSS 变量 ===== */
:root {
    --bg: #ffffff;
    --bg-gray: #f8fafc;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --primary-bg: #eff6ff;
    --accent: #0891b2;
    --accent-bg: #ecfeff;
    --green: #059669;
    --green-bg: #ecfdf5;
    --purple: #7c3aed;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 10px 30px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05), 0 20px 60px rgba(0, 0, 0, 0.08);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== 文字渐变 ===== */
.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 32px; border-radius: 50px; font-size: 0.95rem; font-weight: 600;
    cursor: pointer; transition: var(--transition); border: none; white-space: nowrap;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff; box-shadow: 0 2px 12px rgba(37, 99, 235, 0.3);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(37, 99, 235, 0.4); }
.btn-outline {
    background: transparent; color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); }
.btn-full { width: 100%; }

/* ===== 导航栏 ===== */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 16px 0; transition: var(--transition); background: transparent;
}
.header.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border); padding: 10px 0; box-shadow: var(--shadow-sm);
}
.nav-container { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.25rem; font-weight: 700; }
.logo-svg { flex-shrink: 0; }
.nav { display: flex; gap: 2px; }
.nav-link {
    padding: 8px 16px; border-radius: 8px; font-size: 0.9rem;
    color: var(--text-secondary); transition: var(--transition); font-weight: 500;
}
.nav-link:hover, .nav-link.active {
    color: var(--primary); background: var(--primary-bg);
}
.lang-switch {
    padding: 8px 12px; border-radius: 8px; font-size: 0.78rem;
    font-weight: 700; color: var(--primary); background: var(--primary-bg);
    border: 1px solid #bfdbfe; transition: var(--transition); margin-left: 8px;
    display: inline-flex; align-items: center; justify-content: center;
    line-height: 1; min-width: 34px;
    text-decoration: none;
}
.lang-switch:hover {
    background: var(--primary); color: #fff; border-color: var(--primary);
}
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* ===== Hero ===== */
.hero {
    position: relative; min-height: 100vh; display: flex;
    align-items: center; padding-top: 100px; padding-bottom: 120px;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 40%, #f0f9ff 100%);
    overflow: hidden;
}
.hero-particles { position: absolute; inset: 0; pointer-events: none; opacity: 0.5; }
.hero-content { position: relative; z-index: 2; text-align: center; max-width: 780px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 20px; border-radius: 50px; font-size: 0.85rem;
    color: var(--primary); background: var(--primary-bg);
    border: 1px solid #bfdbfe; margin-bottom: 28px; font-weight: 500;
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--primary); animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%,100%{opacity:1} 50%{opacity:0.3} }

.hero-title {
    font-size: clamp(2.4rem, 5.5vw, 3.6rem); font-weight: 800;
    line-height: 1.2; letter-spacing: -1.5px; margin-bottom: 20px; color: #0f172a;
}
.hero-desc {
    font-size: 1.08rem; color: var(--text-secondary); line-height: 1.9;
    margin-bottom: 40px; max-width: 600px; margin-left: auto; margin-right: auto;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.hero-bottom-bar {
    position: absolute; bottom: 0; left: 0; right: 0;
    background: rgba(255,255,255,0.7); backdrop-filter: blur(12px);
    border-top: 1px solid var(--border); padding: 24px 0; z-index: 2;
}
.hero-metrics { display: flex; justify-content: center; align-items: center; gap: 0; }
.metric { text-align: center; padding: 0 40px; }
.metric-value { display: block; font-size: 1.15rem; font-weight: 700; color: var(--text); }
.metric-label { display: block; font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }
.metric-divider { width: 1px; height: 32px; background: var(--border); }

/* ===== Section 通用 ===== */
.section { padding: 100px 0; position: relative; }
.section-gray { background: var(--bg-gray); }
.section-dark { background: var(--bg-dark); color: #fff; }
.section-dark .section-desc { color: #94a3b8; }
.section-dark .section-tag { color: var(--primary-light); }
.section-header { text-align: center; max-width: 680px; margin: 0 auto 64px; }
.section-tag {
    display: inline-block; font-size: 0.78rem; font-weight: 700;
    letter-spacing: 3px; text-transform: uppercase;
    color: var(--primary); margin-bottom: 12px;
}
.section-title { font-size: clamp(2rem, 4vw, 2.6rem); font-weight: 800; letter-spacing: -0.5px; margin-bottom: 16px; }
.section-desc { font-size: 1.02rem; color: var(--text-secondary); line-height: 1.8; }

/* ===== 关于我们 ===== */
.about-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.about-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 36px 28px; text-align: center;
    transition: var(--transition);
}
.about-card:hover { border-color: #bfdbfe; box-shadow: var(--shadow-md); transform: translateY(-2px); }
.about-card-icon {
    width: 56px; height: 56px; margin: 0 auto 20px; display: flex;
    align-items: center; justify-content: center; color: var(--primary);
    background: var(--primary-bg); border-radius: var(--radius);
}
.about-card-icon svg { width: 28px; height: 28px; }
.about-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.about-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== 解决方案 Tabs ===== */
.solutions-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 48px; flex-wrap: wrap; }
.sol-tab {
    padding: 10px 24px; border-radius: 50px; border: 1.5px solid var(--border);
    background: var(--bg); font-size: 0.92rem; font-weight: 500; cursor: pointer;
    transition: var(--transition); color: var(--text-secondary); font-family: inherit;
}
.sol-tab:hover { border-color: var(--primary); color: var(--primary); }
.sol-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.sol-panel { display: none; }
.sol-panel.active { display: block; animation: fadeSlideIn 0.4s ease; }
@keyframes fadeSlideIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.sol-layout {
    display: grid; grid-template-columns: 320px 1fr; gap: 60px;
    align-items: start;
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 48px;
}
.sol-visual { display: flex; align-items: center; justify-content: center; }
.sol-visual-placeholder {
    width: 200px; height: 280px; display: flex; align-items: center;
    justify-content: center; color: var(--primary); opacity: 0.6;
}
.sol-visual-placeholder svg { width: 100%; height: 100%; }
.sol-detail h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 12px; }
.sol-intro { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.8; margin-bottom: 28px; }
.sol-features { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.sol-feat { display: flex; gap: 12px; align-items: flex-start; }
.sol-feat-icon {
    width: 22px; height: 22px; border-radius: 50%; background: var(--green-bg);
    color: var(--green); display: flex; align-items: center; justify-content: center;
    font-size: 0.75rem; font-weight: 700; flex-shrink: 0; margin-top: 2px;
}
.sol-feat strong { display: block; font-size: 0.92rem; font-weight: 600; margin-bottom: 4px; }
.sol-feat p { font-size: 0.84rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== 平台架构 ===== */
.platform-arch {
    max-width: 900px; margin: 0 auto 64px;
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 48px;
}
.arch-layer { margin-bottom: 12px; }
.arch-layer:last-child { margin-bottom: 0; }
.arch-layer-label {
    font-size: 0.78rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2px; color: var(--text-muted); margin-bottom: 12px;
}
.arch-items { display: flex; gap: 10px; flex-wrap: wrap; }
.arch-item {
    padding: 14px 20px; border-radius: var(--radius-sm); font-size: 0.85rem;
    font-weight: 500; text-align: center; background: var(--bg-gray);
    border: 1px solid var(--border-light); color: var(--text-secondary);
    flex: 1; min-width: 100px; line-height: 1.5;
}
.arch-item.highlight { background: var(--primary-bg); border-color: #bfdbfe; color: var(--primary); font-weight: 600; }
.arch-arrow { text-align: center; color: var(--primary); font-size: 1.2rem; margin: 8px 0; }

.platform-features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pf-card {
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 32px; transition: var(--transition);
}
.pf-card:hover { border-color: #bfdbfe; box-shadow: var(--shadow-md); }
.pf-icon { font-size: 1.8rem; margin-bottom: 14px; }
.pf-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.pf-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== AI 增值服务 ===== */
.ai-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 48px; }
.ai-card {
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 36px; transition: var(--transition);
}
.ai-card:hover { border-color: #bfdbfe; box-shadow: var(--shadow-md); }
.ai-card-header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.ai-card-num {
    font-size: 1.5rem; font-weight: 900; color: var(--primary); opacity: 0.25; flex-shrink: 0;
}
.ai-card h3 { font-size: 1.15rem; font-weight: 700; }
.ai-card > p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.7; }
.ai-card-list { list-style: none; }
.ai-card-list li {
    font-size: 0.85rem; color: var(--text-secondary); padding: 6px 0;
    border-bottom: 1px solid var(--border-light); line-height: 1.5;
}
.ai-card-list li:last-child { border-bottom: none; }
.ai-card-list li::before { content: '▸ '; color: var(--primary); font-size: 0.7rem; }

.ai-revenue-model { max-width: 720px; margin: 0 auto; }
.revenue-card {
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--accent-bg) 100%);
    border: 1px solid #bfdbfe; border-radius: var(--radius-xl); padding: 40px; text-align: center;
}
.revenue-card h4 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.revenue-card > p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 24px; }
.revenue-formula {
    display: flex; align-items: center; justify-content: center; gap: 12px;
    flex-wrap: wrap; font-size: 0.88rem;
}
.revenue-formula span {
    padding: 8px 16px; border-radius: 8px; background: var(--bg);
    border: 1px solid var(--border); font-weight: 600; color: var(--text);
}
.rf-arrow { color: var(--primary); font-size: 1.2rem; }
.revenue-formula .rf-arrow { background: none !important; border: none !important; padding: 0 4px !important; }

/* ===== 合作流程 ===== */
.process-steps { max-width: 720px; margin: 0 auto; }
.process-step { display: flex; gap: 20px; }
.process-step:last-child .step-line { display: none; }
.step-marker { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; }
.step-num {
    width: 44px; height: 44px; border-radius: 50%; display: flex;
    align-items: center; justify-content: center; font-size: 0.85rem; font-weight: 700;
    background: var(--primary-bg); color: var(--primary); border: 2px solid #bfdbfe;
    flex-shrink: 0;
}
.step-line { width: 2px; flex: 1; min-height: 48px; background: var(--border); margin: 8px 0; }
.step-content { padding-bottom: 40px; flex: 1; }
.step-content h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.step-content p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }
.step-time {
    display: inline-block; margin-top: 8px; font-size: 0.8rem;
    color: var(--text-muted); font-weight: 500;
}

/* ===== 联系我们 ===== */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-card {
    background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius); padding: 24px; display: flex; gap: 14px; align-items: flex-start;
}
.contact-card strong { display: block; font-size: 0.9rem; margin-bottom: 4px; }
.contact-card p { font-size: 0.85rem; color: #94a3b8; }
.cc-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 1px; }

.contact-form {
    background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-xl); padding: 40px; display: flex; flex-direction: column; gap: 20px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.88rem; font-weight: 600; color: #e2e8f0; }
.form-group input, .form-group textarea, .form-group select {
    padding: 12px 16px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-sm); font-size: 0.92rem; color: #fff;
    font-family: inherit; transition: var(--transition);
}
.form-group textarea { resize: vertical; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: rgba(148,163,184,0.4); }
.form-group select option { background: var(--bg-dark); color: #fff; }

/* ===== Footer ===== */
.footer { background: var(--bg-dark); color: #fff; padding: 64px 0 24px; border-top: 1px solid rgba(255,255,255,0.06); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-logo { display: flex; align-items: center; gap: 10px; font-size: 1.15rem; font-weight: 700; margin-bottom: 14px; }
.footer-brand p { font-size: 0.85rem; color: #94a3b8; line-height: 1.8; }
.footer-col h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 14px; color: #e2e8f0; }
.footer-col a, .footer-col p { display: block; font-size: 0.84rem; color: #94a3b8; padding: 3px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--primary-light); }
.footer-bottom { padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.06); text-align: center; display: flex; flex-wrap: wrap; justify-content: center; gap: 24px; }
.footer-bottom p { font-size: 0.82rem; color: #64748b; }
.footer-beian { opacity: 0.5; }

/* ===== 表单提示信息 ===== */
.form-message { padding: 12px 16px; border-radius: 8px; font-size: 0.88rem; text-align: center; margin-top: 4px; }
.form-message-success { background: rgba(5,150,105,0.15); color: #34d399; border: 1px solid rgba(5,150,105,0.2); }
.form-message-error { background: rgba(239,68,68,0.15); color: #f87171; border: 1px solid rgba(239,68,68,0.2); }

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

/* ===== Particle canvas ===== */
#particles canvas { position: absolute; top: 0; left: 0; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .about-grid { grid-template-columns: repeat(2, 1fr); }
    .ai-grid { grid-template-columns: 1fr; }
    .sol-layout { grid-template-columns: 1fr; gap: 32px; }
    .sol-visual { display: none; }
    .platform-features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav {
        position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
        flex-direction: column; background: var(--bg); padding: 80px 24px 24px;
        transition: var(--transition); border-left: 1px solid var(--border); box-shadow: var(--shadow-lg);
    }
    .nav.active { right: 0; }
    .menu-toggle { display: flex; z-index: 1001; }

    .hero { padding-bottom: 140px; }
    .hero-metrics { flex-wrap: wrap; gap: 16px; }
    .metric { padding: 0 24px; }
    .metric-divider { display: none; }

    .section { padding: 64px 0; }
    .about-grid { grid-template-columns: 1fr; }
    .sol-features { grid-template-columns: 1fr; }
    .sol-layout { padding: 28px; }
    .platform-features-grid { grid-template-columns: 1fr; }
    .contact-layout { grid-template-columns: 1fr; }
    .contact-cards { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 480px) {
    .hero-buttons { flex-direction: column; align-items: center; }
    .btn { width: 100%; }
    .footer-grid { grid-template-columns: 1fr; }
    .revenue-formula { flex-direction: column; }
    .rf-arrow { transform: rotate(90deg); }
}