/* ===================================================
   锻造企业版 - 制造型企业网站模板
   Forge v1.0.0 | 工业实用 × 杂志编辑风格
   =================================================== */

/* ========== CSS 变量 ========== */
:root {
    --color-primary: #1a2b3c;
    --color-primary-light: #2c4a6e;
    --color-primary-dark: #0f1a26;
    --color-accent: #c4a86a;
    --color-accent-light: #dcc89a;
    --color-accent-dark: #a88a4a;
    --color-red: #c0392b;
    --color-white: #ffffff;
    --color-bg: #f7f6f3;
    --color-bg-alt: #eef0f2;
    --color-bg-dark: #1a2b3c;
    --color-text: #2c3e50;
    --color-text-light: #7f8c8d;
    --color-text-inverse: #f0f0f0;
    --color-border: #e0e3e6;
    --color-border-light: #edf0f2;

    --font-heading: 'Noto Serif SC', 'Source Han Serif SC', Georgia, serif;
    --font-body: 'Noto Sans SC', 'Source Han Sans SC', -apple-system, sans-serif;

    --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 8px 40px rgba(0,0,0,0.12);
    --shadow-gold: 0 4px 20px rgba(196,168,106,0.2);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --header-height: 60px;
    --max-width: 1200px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Reset & Base ========== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-accent);
}

ul { list-style: none; }

/* ========== Container ========== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== Section Spacing ========== */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-dark {
    background: var(--color-bg-dark);
    color: var(--color-text-inverse);
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

.section-title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: 48px;
    max-width: 600px;
}

.text-center { text-align: center; }
.text-center .section-subtitle { margin-left: auto; margin-right: auto; }

/* ========== Header ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(26, 43, 60, 0.97);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.15);
    transition: all var(--transition);
}

.site-header.scrolled {
    background: rgba(26, 43, 60, 0.98);
    box-shadow: 0 2px 24px rgba(0,0,0,0.2);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1001;
}

.logo-img {
    max-height: 40px;
    width: auto;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-white);
    letter-spacing: 2px;
}

.site-header.scrolled .logo-text { color: var(--color-white); }

/* ========== Navigation ========== */
.main-nav ul {
    display: flex;
    gap: 4px;
}

.main-nav > ul > li {
    position: relative;
}

.main-nav > ul > li > a {
    display: block;
    padding: 6px 16px;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.85);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    position: relative;
}

.main-nav > ul > li > a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--color-accent);
    transition: transform var(--transition);
}

.main-nav > ul > li > a:hover,
.main-nav > ul > li > a.active {
    color: var(--color-accent);
    background: rgba(255,255,255,0.05);
}

.main-nav > ul > li > a.active::after,
.main-nav > ul > li > a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

/* Sub-menu */
.main-nav .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition);
    z-index: 100;
}

.main-nav > ul > li:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-nav .sub-menu a {
    display: block;
    padding: 8px 20px;
    font-size: 0.875rem;
    color: var(--color-text);
    transition: all var(--transition);
}

.main-nav .sub-menu a:hover {
    background: var(--color-bg);
    color: var(--color-accent-dark);
    padding-left: 24px;
}

/* ========== Mobile Menu ========== */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    padding: 0;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all var(--transition);
    transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== Hero ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 40%, var(--color-primary-light) 100%);
}

/* 工业噪点纹理背景 */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    opacity: 0.15;
    pointer-events: none;
}

/* 装饰光晕 */
.hero::after {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 60%;
    height: 80%;
    background: radial-gradient(ellipse at center, rgba(196,168,106,0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    padding: 100px 0 80px;
}

.hero-content h1 {
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 900;
    color: var(--color-white);
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.hero-content h1 .highlight {
    color: var(--color-accent);
}

.hero-content p {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 560px;
}

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

/* Hero - 工业装饰线条 */
.hero-decoration {
    position: absolute;
    right: -5%;
    bottom: 0;
    width: 45%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    pointer-events: none;
}

.hero-decoration svg {
    width: 100%;
    height: 100%;
    opacity: 0.06;
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-gold);
}

.btn-outline {
    background: transparent;
    border-color: rgba(255,255,255,0.3);
    color: var(--color-white);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-white {
    background: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-white);
}

.btn-white:hover {
    background: transparent;
    color: var(--color-white);
    transform: translateY(-2px);
}

/* ========== Cards Grid ========== */
.grid {
    display: grid;
    gap: 30px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

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

.card-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
    background: var(--color-bg-alt);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-body {
    padding: 24px;
}

.card-body h3 {
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.card-body h3 a {
    color: var(--color-text);
}

.card-body h3 a:hover {
    color: var(--color-accent-dark);
}

.card-body p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

.card-meta {
    display: flex;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-bottom: 8px;
}

/* ========== Product Cards (3D Tilt) ========== */
.product-card {
    position: relative;
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    will-change: transform;
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

.product-card .card-image {
    aspect-ratio: 4/3;
}

.product-card .card-category {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 12px;
    background: var(--color-accent);
    color: var(--color-primary-dark);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
    z-index: 2;
}

/* ========== About Preview Section (首页) ========== */
.about-preview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

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

.about-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, rgba(196,168,106,0.2), transparent);
    z-index: 1;
}

.about-image img {
    width: 100%;
    height: 450px;
    object-fit: cover;
}

.about-text h2 {
    margin-bottom: 20px;
}

.about-text p {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 16px;
}

/* ========== Stats ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item {
    padding: 40px 20px;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-accent);
    display: block;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}

.stat-item .stat-divider {
    width: 40px;
    height: 2px;
    background: var(--color-accent);
    margin: 12px auto;
    opacity: 0.5;
}

/* ========== Certification Badges ========== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 24px;
}

.cert-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    border-top: 3px solid var(--color-accent);
}

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

.cert-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
    border-radius: 50%;
    color: var(--color-primary-dark);
    font-size: 1.5rem;
    font-weight: 700;
}

.cert-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.cert-card p {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ========== Content List Page (list.htm) ========== */
.page-header {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
    pointer-events: none;
}

.page-header h1 {
    color: var(--color-white);
    margin-bottom: 8px;
}

.page-header p {
    color: rgba(255,255,255,0.6);
    font-size: 1rem;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    margin-bottom: 16px;
}

.breadcrumb a {
    color: rgba(255,255,255,0.6);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb .separator {
    color: rgba(255,255,255,0.3);
}

/* Sub-category tabs */
.sub-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 40px;
}

.sub-categories a {
    padding: 8px 20px;
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    transition: all var(--transition);
    color: var(--color-text);
}

.sub-categories a:hover,
.sub-categories a.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-primary-dark);
}

/* ========== Content Detail (content.htm) ========== */
.content-detail {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 0;
}

.content-detail .content-title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    margin-bottom: 16px;
}

.content-detail .content-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.875rem;
    color: var(--color-text-light);
    padding-bottom: 24px;
    margin-bottom: 32px;
    border-bottom: 1px solid var(--color-border-light);
}

.content-detail .content-body {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--color-text);
}

.content-detail .content-body p {
    margin-bottom: 1.5em;
}

.content-detail .content-body img {
    border-radius: var(--radius-md);
    margin: 24px 0;
    box-shadow: var(--shadow-md);
}

.content-detail .content-body h2,
.content-detail .content-body h3 {
    margin-top: 40px;
    margin-bottom: 16px;
}

/* ========== Pagination ========== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 48px;
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    color: var(--color-text);
}

.pagination a:hover {
    border-color: var(--color-accent);
    color: var(--color-accent-dark);
    background: rgba(196,168,106,0.08);
}

.pagination .current {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-primary-dark);
    font-weight: 600;
}

/* ========== Single Page (page.htm) ========== */
.page-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 0;
}

.page-content h2 { margin-top: 40px; margin-bottom: 16px; }
.page-content p { margin-bottom: 1.2em; line-height: 2; }
.page-content img { border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow-md); }

/* ========== Contact Form ========== */
.contact-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 1.25rem;
    margin-bottom: 24px;
}

.contact-info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.contact-info-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(196,168,106,0.1);
    border-radius: 50%;
    color: var(--color-accent-dark);
}

.contact-info-text h4 {
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.contact-info-text p {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

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

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    transition: all var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(196,168,106,0.1);
    background: var(--color-white);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ========== Footer ========== */
.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand h3 {
    font-size: 1.25rem;
    color: var(--color-white);
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 0.875rem;
    line-height: 1.8;
    margin-bottom: 16px;
}

.footer-logo {
    max-height: 36px;
    opacity: 0.7;
}

.footer-nav h4,
.footer-contact h4 {
    font-size: 1rem;
    color: var(--color-white);
    margin-bottom: 16px;
    font-weight: 600;
}

.footer-nav ul li {
    margin-bottom: 8px;
}

.footer-nav a {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.6);
    transition: all var(--transition);
}

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

.footer-contact p {
    font-size: 0.875rem;
    margin-bottom: 10px;
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.footer-qr {
    margin-top: 12px;
}

.footer-qr img {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-sm);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.4);
}

.footer-bottom a {
    color: inherit;
}

.footer-bottom a:hover {
    color: var(--color-accent);
}

/* ========== Back to Top ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    border: none;
    border-radius: 50%;
    color: var(--color-primary-dark);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    background: var(--color-accent-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-gold);
}

/* ========== Animations ========== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger: children delay */
.animate-stagger > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-visible > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: translateY(0); }
.animate-visible > *:nth-child(2) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
.animate-visible > *:nth-child(3) { transition-delay: 0.15s; opacity: 1; transform: translateY(0); }
.animate-visible > *:nth-child(4) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
.animate-visible > *:nth-child(5) { transition-delay: 0.25s; opacity: 1; transform: translateY(0); }
.animate-visible > *:nth-child(6) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }

/* ========== Responsive ========== */
@media (max-width: 992px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .about-preview { grid-template-columns: 1fr; gap: 40px; }
    .contact-section { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .menu-toggle { display: flex; }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--color-primary-dark);
        padding: 100px 24px 40px;
        transition: right var(--transition);
        overflow-y: auto;
        z-index: 1000;
    }

    .main-nav.active {
        right: 0;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }

    .main-nav > ul > li > a {
        padding: 14px 0;
        font-size: 1rem;
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .main-nav > ul > li > a::after { display: none; }

    .main-nav .sub-menu {
        position: static;
        box-shadow: none;
        background: transparent;
        opacity: 1;
        visibility: visible;
        transform: none;
        padding: 0 0 8px 16px;
    }

    .main-nav .sub-menu a {
        color: rgba(255,255,255,0.6);
        padding: 8px 0;
    }

    .main-nav .sub-menu a:hover {
        background: none;
        padding-left: 4px;
    }

    .hero { min-height: 90vh; }
    .hero-content { padding: 90px 0 60px; }

    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

    .section { padding: 48px 0; }

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

    .page-header { padding: 100px 0 40px; }

    .content-detail { padding: 32px 0; }
    .page-content { padding: 32px 0; }

    .contact-form { padding: 24px; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 0; }
    .stat-item { padding: 24px 12px; }

    .hero-decoration { display: none; }

    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; justify-content: center; }
    .stats-grid { grid-template-columns: 1fr; }
}

/* BuildKey-theme-vars */

:root {
  --bk-canvas: 250 250 249;
  --bk-surface: 255 255 255;
  --bk-surface-soft: 244 244 245;
  --bk-border: 228 228 231;
  --bk-heading: 24 24 27;
  --bk-content: 63 63 70;
  --bk-muted: 113 113 122;
  --bk-muted-soft: 161 161 170;
  --bk-primary: 217 119 6;
  --bk-primary-soft: 254 243 199;
  --bk-primary-strong: 180 83 9;
  --bk-on-primary: 255 255 255;
  --bk-invert: 24 24 27;
  --bk-invert-content: 255 255 255;
  --bk-invert-muted: 161 161 170;
  --bk-invert-border: 39 39 42;
  --bk-font: "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
}