/* ============================================= 
   顶尚制帽 · 帽子制造工厂
   样式表 style.css
   设计语言：现代工业风 + 暖色点缀
   ============================================= */

/* ---------- 全局重置 & 变量 ---------- */
:root {
    --primary: #b45309;        /* 暖棕色 - 主色 */
    --primary-dark: #92400e;   /* 深棕色 */
    --primary-light: #d97706;  /* 金色点缀 */
    --secondary: #1e293b;      /* 深蓝灰 */
    --accent: #f59e0b;         /* 琥珀色 */
    --bg-light: #faf7f2;       /* 米白背景 */
    --bg-white: #ffffff;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: 8px;
    --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-dark);
    background: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    background: rgba(180,83,9,0.1);
    color: var(--primary-dark);
    padding: 6px 18px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--secondary);
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: 0 4px 15px rgba(180,83,9,0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(180,83,9,0.4);
}

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

.btn-outline:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-3px);
}

.btn-small {
    padding: 10px 20px;
    font-size: 0.9rem;
    background: var(--bg-light);
    color: var(--primary-dark);
    border: 1.5px solid var(--border);
}

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

.btn-lg {
    padding: 18px 44px;
    font-size: 1.1rem;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ---------- 头部导航 ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(250,247,242,0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
    padding: 0 20px;
}

.site-header.scrolled {
    background: rgba(250,247,242,0.96);
    border-bottom-color: var(--border);
    box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--secondary);
}

.logo-icon {
    color: var(--primary);
    font-size: 1.8rem;
}

.main-nav ul {
    display: flex;
    gap: 8px;
}

.main-nav a {
    padding: 8px 16px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.main-nav a:hover, .main-nav a.active {
    color: var(--primary-dark);
    background: rgba(180,83,9,0.08);
}

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

.hamburger .bar {
    width: 28px;
    height: 3px;
    background: var(--secondary);
    border-radius: 4px;
    transition: var(--transition);
}

/* 移动端导航展开 */
.main-nav.open {
    display: flex !important;
}

/* ---------- HERO ---------- */
.hero {
    padding: 160px 0 100px;
    background: var(--bg-light);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(180,83,9,0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

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

.hero-badge {
    display: inline-block;
    background: rgba(180,83,9,0.1);
    color: var(--primary-dark);
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-text h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--secondary);
}

.highlight {
    background: linear-gradient(120deg, var(--primary-light), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 520px;
    margin-bottom: 30px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-dark);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.hero-image-wrapper img {
    width: 100%;
    height: 440px;
    object-fit: cover;
    transition: var(--transition);
}

.hero-image-wrapper:hover img {
    transform: scale(1.03);
}

.hero-badge-card {
    position: absolute;
    bottom: 24px;
    left: 24px;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(8px);
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-md);
    color: var(--primary-dark);
}

/* ---------- 核心优势 ---------- */
.features {
    background: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--bg-light);
    padding: 40px 28px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: #fff;
    font-size: 1.6rem;
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ---------- 产品系列 ---------- */
.products {
    background: var(--bg-light);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 50px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border);
}

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

.product-img {
    position: relative;
    overflow: hidden;
    height: 220px;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-img img {
    transform: scale(1.08);
}

.product-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--primary);
    color: #fff;
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.product-info {
    padding: 20px;
}

.product-info h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-info p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.price {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--primary-dark);
}

.price small {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-muted);
}

.moq {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--bg-light);
    padding: 4px 10px;
    border-radius: 50px;
}

.products-cta {
    text-align: center;
}

/* ---------- 制造工艺 ---------- */
.process {
    background: var(--bg-white);
}

.process-timeline {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.process-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    background: var(--bg-light);
    padding: 24px 28px;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
    transition: var(--transition);
}

.process-step:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-sm);
}

.step-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-light);
    min-width: 50px;
    line-height: 1;
}

.step-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.step-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ---------- 客户口碑 ---------- */
.testimonials {
    background: var(--bg-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background: var(--bg-white);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.stars {
    color: var(--accent);
    font-size: 1.2rem;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.testimonial-text {
    font-size: 0.98rem;
    color: var(--text-dark);
    line-height: 1.7;
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 14px;
}

.testimonial-author img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-author strong {
    display: block;
    font-size: 0.95rem;
}

.testimonial-author span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ---------- 联系我们 ---------- */
.contact {
    background: var(--bg-white);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: start;
}

.contact-info h2 {
    font-size: 2rem;
    font-weight: 800;
    margin: 12px 0 16px;
}

.contact-info > p {
    color: var(--text-muted);
    margin-bottom: 30px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
}

.contact-details li {
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--text-dark);
    font-size: 0.98rem;
}

.contact-details i {
    width: 20px;
    color: var(--primary);
    font-size: 1.1rem;
}

.contact-social {
    display: flex;
    gap: 14px;
}

.contact-social a {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dark);
    font-size: 1.2rem;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.contact-social a:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.contact-form-wrapper {
    background: var(--bg-light);
    padding: 36px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

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

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    background: var(--bg-white);
    border: 1.5px solid var(--border);
    font-size: 0.95rem;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(180,83,9,0.1);
}

.contact-form textarea {
    resize: vertical;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-checkbox input {
    width: auto;
}

.form-tip {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* 表单验证错误 */
.contact-form input.error,
.contact-form textarea.error {
    border-color: #dc2626;
    background: #fff5f5;
}

/* ---------- 页脚 ---------- */
.site-footer {
    background: var(--secondary);
    color: #cbd5e1;
    padding-top: 60px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand .logo {
    color: #fff;
    font-size: 1.3rem;
    margin-bottom: 12px;
    display: inline-flex;
}

.footer-brand p {
    font-size: 0.9rem;
    margin-top: 12px;
    color: #94a3b8;
}

.footer-links h4,
.footer-newsletter h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #94a3b8;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.newsletter-box {
    display: flex;
    border-radius: 50px;
    overflow: hidden;
    border: 1px solid #334155;
    background: #1e293b;
}

.newsletter-box input {
    flex: 1;
    padding: 12px 18px;
    background: transparent;
    color: #fff;
    font-size: 0.9rem;
}

.newsletter-box input::placeholder {
    color: #64748b;
}

.newsletter-box button {
    background: var(--primary);
    color: #fff;
    padding: 0 20px;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-box button:hover {
    background: var(--primary-dark);
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
    color: #64748b;
}

/* ---------- 回到顶部 ---------- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
    border: none;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

/* ============================================= 
   响应式设计
   ============================================= */

/* 平板 ≤ 992px */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero-text h1 { font-size: 2.5rem; }
    .hero-visual { order: -1; }
    .hero-image-wrapper img { height: 320px; }

    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonials-grid { grid-template-columns: 1fr; }
    .contact-wrapper { grid-template-columns: 1fr; gap: 40px; }
    .footer-inner { grid-template-columns: 1fr 1fr; gap: 30px; }
}

/* 手机 ≤ 768px */
@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(250,247,242,0.98);
        backdrop-filter: blur(16px);
        padding: 20px;
        box-shadow: var(--shadow-md);
        flex-direction: column;
        border-top: 1px solid var(--border);
    }

    .main-nav ul {
        flex-direction: column;
        gap: 4px;
    }

    .main-nav ul li a {
        display: block;
        padding: 12px 16px;
    }

    .hamburger {
        display: flex;
    }

    .hero { padding: 120px 0 60px; }
    .hero-text h1 { font-size: 2rem; }
    .hero-stats { gap: 20px; flex-wrap: wrap; }
    .stat-number { font-size: 1.5rem; }

    .section { padding: 60px 0; }
    .section-header h2 { font-size: 1.8rem; }

    .features-grid { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .process-step { flex-direction: column; gap: 12px; }
    .form-row { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr; }
    .contact-form-wrapper { padding: 24px; }
}

/* 小手机 ≤ 480px */
@media (max-width: 480px) {
    .hero-actions { flex-direction: column; }
    .hero-image-wrapper img { height: 240px; }
    .hero-badge-card { font-size: 0.8rem; padding: 8px 14px; }
    .btn-lg { padding: 14px 28px; font-size: 1rem; }
}