/* ========== 全局重置 & 变量 ========== */
:root {
    --primary: #1e293b;
    --primary-light: #334155;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --bg: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #0f172a;
    --text: #1e293b;
    --text-light: #64748b;
    --text-white: #f1f5f9;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --radius: 20px;
    --radius-sm: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea { font-family: inherit; outline: none; }

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

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 12px 0 16px;
    letter-spacing: -0.02em;
}
.section-header p {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}
.section-header.light h2 { color: #fff; }
.section-header.light p { color: #94a3b8; }

.badge {
    display: inline-block;
    background: rgba(245, 158, 11, 0.12);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 18px;
    border-radius: 100px;
    letter-spacing: 0.3px;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.bg-light { background: var(--bg-light); }
.bg-dark { background: var(--bg-dark); }

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    border: 2px solid transparent;
}
.btn-primary {
    background: var(--accent);
    color: #1e293b;
    border-color: var(--accent);
}
.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.35);
}
.btn-secondary {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}
.btn-secondary:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}
.btn-outline {
    background: transparent;
    color: var(--text-white);
    border: 1.5px solid rgba(255,255,255,0.3);
    padding: 8px 20px;
    font-size: 0.85rem;
}
.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(245,158,11,0.08);
}
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-block { width: 100%; justify-content: center; }
.btn-sm { padding: 8px 18px; font-size: 0.8rem; }

/* ========== 导航 ========== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: var(--transition);
}
header.scrolled {
    background: rgba(15, 23, 42, 0.95);
    box-shadow: 0 2px 30px rgba(0,0,0,0.3);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}
.logo i { color: var(--accent); font-size: 1.6rem; }

nav ul {
    display: flex;
    gap: 8px;
}
nav ul li a {
    color: rgba(255,255,255,0.75);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}
nav ul li a:hover,
nav ul li a.active {
    color: #fff;
    background: rgba(255,255,255,0.08);
}
.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.hamburger span {
    width: 26px;
    height: 2.5px;
    background: #fff;
    border-radius: 4px;
    transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ========== Hero ========== */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: #fff;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(245,158,11,0.08) 0%, transparent 70%);
    pointer-events: none;
}
.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}
.hero-text .badge { margin-bottom: 16px; }
.hero-text h1 {
    font-size: 3.8rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin: 16px 0 20px;
}
.hero-text p {
    font-size: 1.15rem;
    color: #94a3b8;
    max-width: 520px;
    margin-bottom: 36px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 50px;
}
.hero-stats {
    display: flex;
    gap: 40px;
}
.hero-stats div {
    font-size: 0.95rem;
    color: #94a3b8;
}
.hero-stats span {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}
.hero-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.hero-card {
    background: rgba(255,255,255,0.04);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius);
    padding: 28px 32px;
    transition: var(--transition);
}
.hero-card:hover {
    background: rgba(255,255,255,0.08);
    transform: translateY(-4px);
}
.hero-card i {
    font-size: 2.2rem;
    color: var(--accent);
    margin-bottom: 12px;
}
.hero-card h3 { font-size: 1.3rem; margin-bottom: 6px; }
.hero-card p { color: #94a3b8; font-size: 0.95rem; }
.card-delay { margin-left: 40px; }
.hero-glow {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(245,158,11,0.15), transparent);
    filter: blur(60px);
    pointer-events: none;
}

/* ========== 服务 ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}
.service-card {
    background: var(--bg);
    border: 1px solid #e2e8f0;
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.service-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: var(--transition);
}
.service-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: transparent;
}
.service-card:hover::after { transform: scaleY(1); }
.service-card i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 20px;
}
.service-card h3 { font-size: 1.3rem; margin-bottom: 10px; }
.service-card p { color: var(--text-light); font-size: 0.95rem; line-height: 1.7; }

/* ========== 关于 ========== */
.about-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-image img {
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    height: auto;
}
.about-text .badge { margin-bottom: 12px; }
.about-text h2 { font-size: 2.4rem; margin-bottom: 20px; }
.about-text p { color: var(--text-light); margin-bottom: 24px; }
.about-features {
    display: grid;
    gap: 12px;
    margin-bottom: 32px;
}
.about-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
}
.about-features i { color: var(--accent); font-size: 1.2rem; }

/* ========== 追踪 ========== */
.tracking-box {
    max-width: 720px;
    margin: 0 auto;
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 48px 40px;
    box-shadow: var(--shadow-sm);
    border: 1px solid #e2e8f0;
}
.tracking-form .input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    background: #fff;
    border-radius: 60px;
    padding: 6px 6px 6px 20px;
    border: 2px solid #e2e8f0;
    transition: var(--transition);
}
.tracking-form .input-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(245,158,11,0.15);
}
.tracking-form .input-group i { color: var(--text-light); font-size: 1.2rem; }
.tracking-form input {
    flex: 1;
    border: none;
    padding: 14px 0;
    font-size: 1rem;
    background: transparent;
}
.tracking-form button { white-space: nowrap; }

.tracking-result {
    margin-top: 28px;
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 24px;
    border-left: 4px solid var(--accent);
    box-shadow: var(--shadow-sm);
}
.tracking-result h4 { margin-bottom: 12px; font-size: 1.1rem; }
.tracking-result .status-line { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 10px; }
.tracking-result .status-line span { color: var(--text-light); }
.tracking-result .status-line strong { color: var(--primary); }
.tracking-result .progress-steps {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}
.tracking-result .step {
    background: #f1f5f9;
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-light);
}
.tracking-result .step.done { background: var(--accent); color: #1e293b; }
.tracking-result .step.active { background: #dbeafe; color: #1d4ed8; }

.tracking-samples {
    margin-top: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--text-light);
}
.sample-btn {
    background: #fff;
    border: 1px solid #e2e8f0;
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: var(--transition);
}
.sample-btn:hover { border-color: var(--accent); background: rgba(245,158,11,0.06); }

/* ========== 评价 ========== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}
.testimonial-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius);
    padding: 32px;
    transition: var(--transition);
    color: #e2e8f0;
}
.testimonial-card:hover {
    background: rgba(255,255,255,0.07);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}
.testimonial-card .stars { color: var(--accent); margin-bottom: 16px; font-size: 1rem; }
.testimonial-card blockquote { font-style: italic; line-height: 1.7; margin-bottom: 20px; color: #cbd5e1; }
.testimonial-card .author {
    display: flex;
    align-items: center;
    gap: 14px;
}
.testimonial-card .avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: #1e293b;
}
.testimonial-card .author-info h5 { font-weight: 600; color: #fff; }
.testimonial-card .author-info span { font-size: 0.85rem; color: #94a3b8; }

/* ========== 联系 ========== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: start;
}
.contact-info {
    display: grid;
    gap: 20px;
}
.info-card {
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    padding: 24px;
    border: 1px solid #e2e8f0;
    transition: var(--transition);
}
.info-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.info-card i { font-size: 1.8rem; color: var(--accent); margin-bottom: 12px; }
.info-card h4 { margin-bottom: 6px; }
.info-card p { color: var(--text-light); }

.contact-form {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 36px;
    border: 1px solid #e2e8f0;
    box-shadow: var(--shadow-sm);
}
.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1.5px solid #e2e8f0;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: #fafafa;
    transition: var(--transition);
}
.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--accent);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(245,158,11,0.08);
}
.contact-form input { margin-bottom: 16px; }
.contact-form textarea { resize: vertical; margin-bottom: 20px; }

/* ========== 页脚 ========== */
.footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 80px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 60px;
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; font-size: 1.4rem; }
.footer-brand p { margin-bottom: 24px; max-width: 300px; }
.social-links { display: flex; gap: 16px; }
.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    transition: var(--transition);
}
.social-links a:hover { background: var(--accent); color: #1e293b; }
.footer-links h4 { color: #fff; margin-bottom: 20px; font-size: 1rem; }
.footer-links ul li { margin-bottom: 12px; }
.footer-links ul li a { transition: var(--transition); }
.footer-links ul li a:hover { color: var(--accent); }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 24px 0;
    text-align: center;
    font-size: 0.9rem;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .hero-content { grid-template-columns: 1fr; text-align: center; }
    .hero-text h1 { font-size: 3rem; }
    .hero-text p { margin: 0 auto 36px; }
    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }
    .hero-visual { max-width: 400px; margin: 40px auto 0; }
    .card-delay { margin-left: 0; }
    .about-wrapper { grid-template-columns: 1fr; }
    .contact-wrapper { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .section { padding: 70px 0; }
    .hero { padding: 130px 0 70px; min-height: auto; }
    .hero-text h1 { font-size: 2.2rem; }
    .hero-stats { gap: 24px; flex-wrap: wrap; }
    .hero-stats div { text-align: center; }

    nav ul {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(15,23,42,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 20px 24px;
        gap: 4px;
        transform: translateY(-120%);
        opacity: 0;
        transition: var(--transition);
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    nav ul.open { transform: translateY(0); opacity: 1; }
    nav ul li a { display: block; padding: 12px 16px; }
    .hamburger { display: flex; }
    .nav-right .btn-outline { display: none; }

    .services-grid { grid-template-columns: 1fr; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .contact-form .form-row { grid-template-columns: 1fr; }
    .tracking-box { padding: 32px 20px; }
    .tracking-form .input-group { flex-wrap: wrap; padding: 12px; border-radius: 24px; }
    .tracking-form .input-group input { width: 100%; padding: 8px 0; }
    .tracking-form .input-group button { width: 100%; justify-content: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 480px) {
    .hero-text h1 { font-size: 1.9rem; }
    .section-header h2 { font-size: 1.8rem; }
    .container { padding: 0 16px; }
    .btn-lg { padding: 14px 28px; font-size: 0.95rem; }
}