/* ============================================
   品秀国际 - Corporate Website Styles
   Minimalist | Luxury | Professional
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    /* Colors */
    --color-primary: #1a365d;
    --color-primary-dark: #0f2340;
    --color-secondary: #475569;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-lighter: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-gray: #f8fafc;
    --color-bg-dark: #0f172a;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Typography */
    --font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --line-height-tight: 1.2;
    --line-height-normal: 1.6;

    /* Layout */
    --container-max: 1200px;
    --header-height: 80px;

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ---------- Layout ---------- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-3xl) 0;
}

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

.section-dark {
    background: var(--color-bg-dark);
    color: #fff;
}

.section-dark .section-desc {
    color: var(--color-text-lighter);
}

/* ---------- Header ---------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: box-shadow var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-secondary);
    padding: var(--space-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-primary);
    transition: width var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-btn {
    padding: var(--space-xs) var(--space-md);
    background: var(--color-primary);
    color: #fff !important;
    border-radius: var(--radius-sm);
}

.nav-btn::after {
    display: none;
}

.nav-btn:hover {
    background: var(--color-primary-dark);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 180px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    padding: var(--space-xs) 0;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
}

.dropdown-menu a:hover {
    background: var(--color-bg-gray);
    color: var(--color-primary);
}

/* ---------- Language Switch ---------- */
.lang-switch {
    position: relative;
    display: flex;
    align-items: center;
    cursor: pointer;
    margin-left: var(--space-md);
    user-select: none;
}

.lang-active {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    transition: all var(--transition);
}

.lang-switch:hover .lang-active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    min-width: 100px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 100;
    padding: var(--space-xs);
}

.lang-switch:hover .lang-dropdown,
.lang-switch.active .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.lang-option:hover {
    background: var(--color-bg-gray);
    color: var(--color-primary);
}

.lang-option.active {
    background: var(--color-primary);
    color: #fff;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-xs);
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231a365d' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

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

.hero-tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-primary-dark);
    margin-bottom: var(--space-md);
}

.hero-desc {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    margin-bottom: var(--space-xl);
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.8); }
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
}

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-lg {
    padding: 1rem 2rem;
}

.btn-block {
    width: 100%;
}

/* ---------- Section Headers ---------- */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

.section-tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.section-desc {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
}

.section-footer {
    text-align: center;
    margin-top: var(--space-2xl);
}

/* ---------- About Section ---------- */
.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.about-card {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.about-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.about-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.about-text h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.about-text p {
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 500;
    color: var(--color-primary);
    margin-top: var(--space-md);
}

.link-arrow:hover span {
    transform: translateX(4px);
}

.link-arrow span {
    transition: transform var(--transition);
}

.about-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* ---------- Products Section ---------- */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

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

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

.product-image {
    height: 200px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.product-info {
    padding: var(--space-lg);
}

.product-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.product-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.product-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
}

.product-link:hover {
    color: var(--color-primary-dark);
}

/* ---------- Services Section ---------- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.service-card {
    padding: var(--space-xl);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition);
}

.service-card:hover {
    box-shadow: var(--shadow-lg);
}

.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.service-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.service-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ---------- Factory Section ---------- */
.factory-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.factory-main {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.factory-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.factory-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.factory-feature {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.feature-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
}

.feature-unit {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-left: var(--space-xs);
}

.feature-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--space-xs);
}

.capabilities-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.capabilities-list {
    display: grid;
    gap: var(--space-md);
}

.capability {
    display: grid;
    grid-template-columns: 200px 1fr;
    align-items: center;
    gap: var(--space-md);
}

.capability-name {
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

.capability-bar {
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
}

.capability-progress {
    height: 100%;
    background: var(--color-primary);
    border-radius: 2px;
    transition: width 1s ease;
}

/* ---------- Cases Section ---------- */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 250px);
    gap: var(--space-md);
}

.case-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.case-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.case-large {
    grid-column: span 2;
}

.case-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: #fff;
}

.case-tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    background: var(--color-primary);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-xs);
}

.case-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.case-desc {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/* ---------- Contact Section ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-2xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.contact-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-lighter);
}

.contact-value {
    font-size: var(--font-size-base);
    color: #fff;
}

.contact-value[href]:hover {
    color: var(--color-primary);
}

.contact-form {
    background: var(--color-bg);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: var(--font-size-sm);
    color: var(--color-text);
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-lighter);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-bg);
}

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

/* ---------- Footer ---------- */
.footer {
    background: var(--color-primary-dark);
    color: #fff;
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand .logo-text {
    color: #fff;
    font-size: var(--font-size-xl);
    display: block;
    margin-bottom: var(--space-sm);
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-lighter);
    max-width: 280px;
}

.footer-links h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--color-text-lighter);
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-text-lighter);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }

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

    .about-content {
        grid-template-columns: 1fr;
    }

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

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

    .factory-grid {
        grid-template-columns: 1fr;
    }

    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: auto;
    }

    .case-large {
        grid-column: span 2;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    :root {
        --space-3xl: 4rem;
        --font-size-5xl: 2rem;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--space-lg);
        gap: var(--space-md);
        transform: translateX(-100%);
        transition: transform var(--transition);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-link {
        font-size: var(--font-size-lg);
    }

    .mobile-toggle {
        display: flex;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .dropdown-menu {
        position: static;
        transform: none;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        display: none;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }

    .hero-actions {
        flex-direction: column;
    }

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

    .products-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }

    .capability {
        grid-template-columns: 1fr;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .case-large {
        grid-column: span 1;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

    /* Mobile Language Switch */
    .lang-switch {
        position: static;
        margin-left: 0;
        margin-top: var(--space-sm);
    }

    .lang-dropdown {
        position: static;
        margin-top: var(--space-xs);
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background: transparent;
        padding: 0;
        display: none;
    }

    .lang-switch.active .lang-dropdown {
        display: block;
    }

    .lang-option {
        padding: var(--space-xs) 0;
    }
}