/* ========================================
   定神收银系统企业官网 - 拟物化风格
   ======================================== */

/* CSS Variables - Design System */
:root {
    /* Colors */
    --wood: #8B5A2B;
    --wood-deep: #66391B;
    --leather: #56351D;
    --leather-deep: #472A15;
    --brass: #D9A32F;
    --brass-deep: #9C6F14;
    --silver: #C0C0C0;
    --paper: #F0E6D2;
    --paper-hi: #FBF4E3;
    --ink: #2B1D12;
    
    /* Typography */
    --font-family: 'Playfair Display', serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Border Radius */
    --radius: 10px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(43, 29, 18, 0.1);
    --shadow-md: 0 4px 8px rgba(43, 29, 18, 0.15), 0 2px 4px rgba(43, 29, 18, 0.1);
    --shadow-lg: 0 8px 16px rgba(43, 29, 18, 0.2), 0 4px 8px rgba(43, 29, 18, 0.15), 0 2px 4px rgba(43, 29, 18, 0.1);
    --shadow-xl: 0 12px 24px rgba(43, 29, 18, 0.25), 0 8px 16px rgba(43, 29, 18, 0.2), 0 4px 8px rgba(43, 29, 18, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--ink);
    background-color: var(--paper);
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(139, 90, 43, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(102, 57, 27, 0.05) 0%, transparent 50%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--ink);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
    font-size: 18px;
}

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--wood-deep);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-family: var(--font-family);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    min-height: 44px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brass) 0%, var(--brass-deep) 100%);
    color: var(--ink);
    box-shadow: var(--shadow-md), inset 0 1px 2px rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--brass-deep) 0%, var(--brass) 100%);
    box-shadow: var(--shadow-lg), inset 0 1px 2px rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm), inset 0 1px 2px rgba(255, 255, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--wood);
    border: 2px solid var(--wood);
}

.btn-secondary:hover {
    background: var(--wood);
    color: var(--paper);
}

.btn-ghost {
    background: transparent;
    color: var(--wood);
    padding: 8px 16px;
}

.btn-ghost:hover {
    color: var(--wood-deep);
    text-decoration: underline;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--paper-hi);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid rgba(139, 90, 43, 0.2);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--ink);
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--wood);
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--ink);
    font-size: 15px;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background: rgba(139, 90, 43, 0.1);
    color: var(--wood);
}

.nav-link.active {
    background: var(--wood);
    color: var(--paper);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--ink);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--paper) 0%, var(--paper-hi) 100%);
}

.hero-content {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.hero-eyebrow {
    display: inline-block;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--wood);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--ink) 0%, var(--wood-deep) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--wood);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

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

.hero-card {
    background: linear-gradient(135deg, var(--wood) 0%, var(--wood-deep) 100%);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateX(5deg);
    transition: transform var(--transition-base);
}

.hero-card:hover {
    transform: perspective(1000px) rotateX(0deg);
}

.hero-card-inner svg {
    width: 200px;
    height: 150px;
}

/* Info Strip */
.info-strip {
    padding: var(--spacing-xl) 0;
    background: var(--paper-hi);
    border-top: 1px solid rgba(139, 90, 43, 0.1);
    border-bottom: 1px solid rgba(139, 90, 43, 0.1);
}

.chip-group {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.chip {
    display: inline-block;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--wood);
    background: var(--paper);
    border: 1px solid var(--wood);
    border-radius: 20px;
}

/* Features Section */
.features {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    text-align: center;
    color: var(--wood);
    margin-bottom: var(--spacing-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--paper-hi);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(139, 90, 43, 0.2);
    transition: all var(--transition-base);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--wood);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--wood);
    font-size: 14px;
    margin-bottom: 0;
}

/* Products Preview */
.products-preview {
    padding: var(--spacing-3xl) 0;
    background: var(--paper-hi);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.product-card {
    background: var(--paper);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(139, 90, 43, 0.2);
    transition: all var(--transition-base);
}

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

.product-image {
    margin-bottom: var(--spacing-md);
}

.product-image svg {
    width: 120px;
    height: 100px;
}

.product-card h3 {
    margin-bottom: var(--spacing-sm);
}

.product-card p {
    color: var(--wood);
    font-size: 14px;
    margin-bottom: var(--spacing-md);
}

/* Contact Form */
.contact-form {
    padding: var(--spacing-3xl) 0;
}

.form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--ink);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font-family);
    font-size: 16px;
    color: var(--ink);
    background: var(--paper-hi);
    border: 2px solid rgba(139, 90, 43, 0.3);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--wood);
    box-shadow: 0 0 0 3px rgba(139, 90, 43, 0.2);
}

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

.form .btn {
    width: 100%;
}

/* Page Header */
.page-header {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--paper) 0%, var(--paper-hi) 100%);
    text-align: center;
}

.page-title {
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    color: var(--wood);
    font-size: 18px;
}

/* About Section */
.about-intro {
    padding: var(--spacing-3xl) 0;
}

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

.about-content .section-title {
    text-align: left;
}

.about-content p {
    color: var(--wood);
    margin-bottom: var(--spacing-md);
}

.stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 900;
    color: var(--brass-deep);
}

.stat-label {
    font-size: 14px;
    color: var(--wood);
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-card {
    background: linear-gradient(135deg, var(--wood) 0%, var(--wood-deep) 100%);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
}

.about-card svg {
    width: 300px;
    height: 250px;
}

/* Culture Section */
.culture {
    padding: var(--spacing-3xl) 0;
    background: var(--paper-hi);
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.culture-card {
    background: var(--paper);
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(139, 90, 43, 0.2);
}

.culture-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--wood);
}

.culture-icon svg {
    width: 100%;
    height: 100%;
}

.culture-card h3 {
    margin-bottom: var(--spacing-sm);
}

.culture-card p {
    color: var(--wood);
    margin-bottom: 0;
}

/* Timeline */
.timeline {
    padding: var(--spacing-3xl) 0;
}

.timeline-items {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline-items::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--wood);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    padding: var(--spacing-lg) 0;
    display: flex;
    align-items: center;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    width: 16px;
    height: 16px;
    background: var(--brass);
    border: 3px solid var(--paper);
    border-radius: 50%;
    transform: translateX(-50%);
    box-shadow: var(--shadow-sm);
}

.timeline-content {
    width: 45%;
    background: var(--paper-hi);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(139, 90, 43, 0.2);
}

.timeline-content h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--brass-deep);
}

.timeline-content p {
    color: var(--wood);
    margin-bottom: 0;
}

/* Products List */
.products-list {
    padding: var(--spacing-3xl) 0;
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    margin-bottom: var(--spacing-3xl);
    padding: var(--spacing-xl);
    background: var(--paper-hi);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(139, 90, 43, 0.2);
}

.product-detail.reverse {
    direction: rtl;
}

.product-detail.reverse > * {
    direction: ltr;
}

.product-tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 500;
    color: var(--brass-deep);
    background: rgba(217, 163, 47, 0.2);
    border-radius: 20px;
    margin-bottom: var(--spacing-md);
}

.product-detail-content h2 {
    margin-bottom: var(--spacing-md);
}

.product-detail-content p {
    color: var(--wood);
    margin-bottom: var(--spacing-md);
}

.product-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.product-features li {
    padding: var(--spacing-sm) 0;
    color: var(--wood);
    position: relative;
    padding-left: var(--spacing-lg);
}

.product-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--brass);
    border-radius: 50%;
}

.product-detail-image {
    display: flex;
    justify-content: center;
}

.product-detail-image svg {
    width: 300px;
    height: 250px;
}

/* Service Advantages */
.service-advantages {
    padding: var(--spacing-3xl) 0;
    background: var(--paper-hi);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.advantage-card {
    background: var(--paper);
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(139, 90, 43, 0.2);
    transition: all var(--transition-base);
}

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

.advantage-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--wood);
}

.advantage-icon svg {
    width: 100%;
    height: 100%;
}

.advantage-card h3 {
    margin-bottom: var(--spacing-sm);
}

.advantage-card p {
    color: var(--wood);
    margin-bottom: 0;
}

/* Team Grid */
.team-grid {
    padding: var(--spacing-3xl) 0;
}

.team-members {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.team-card {
    background: var(--paper-hi);
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(139, 90, 43, 0.2);
    transition: all var(--transition-base);
}

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

.team-avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-md);
}

.team-avatar svg {
    width: 100%;
    height: 100%;
}

.team-card h3 {
    margin-bottom: var(--spacing-xs);
}

.team-role {
    display: block;
    font-size: 14px;
    color: var(--brass-deep);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.team-card p {
    color: var(--wood);
    font-size: 14px;
    margin-bottom: 0;
}

/* Join Us */
.join-us {
    padding: var(--spacing-3xl) 0;
    background: var(--paper-hi);
}

.join-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.join-content .section-title {
    margin-bottom: var(--spacing-md);
}

.join-content p {
    color: var(--wood);
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    background: var(--leather);
    color: var(--paper);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand .logo {
    color: var(--paper);
    margin-bottom: var(--spacing-md);
}

.footer-brand .logo-icon {
    color: var(--brass);
}

.footer-desc {
    color: rgba(240, 230, 210, 0.8);
    font-size: 14px;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-col h4 {
    color: var(--paper);
    margin-bottom: var(--spacing-md);
    font-size: 16px;
}

.footer-col a {
    display: block;
    color: rgba(240, 230, 210, 0.8);
    font-size: 14px;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--brass);
}

.footer-col p {
    color: rgba(240, 230, 210, 0.8);
    font-size: 14px;
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(240, 230, 210, 0.2);
}

.footer-bottom p {
    color: rgba(240, 230, 210, 0.6);
    font-size: 13px;
    margin-bottom: 0;
}

.footer-bottom a {
    color: rgba(240, 230, 210, 0.6);
}

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

/* Responsive */
@media (max-width: 992px) {
    .features-grid,
    .products-grid,
    .culture-grid,
    .advantages-grid,
    .team-members {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-grid,
    .product-detail,
    .product-detail.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--paper-hi);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }
    
    .nav.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .header .btn {
        display: none;
    }
    
    .features-grid,
    .products-grid,
    .culture-grid,
    .advantages-grid,
    .team-members {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }
    
    .stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .timeline-items::before {
        left: 20px;
    }
    
    .timeline-item,
    .timeline-item:nth-child(odd) {
        flex-direction: row;
        padding-left: 50px;
    }
    
    .timeline-dot {
        left: 20px;
    }
    
    .timeline-content {
        width: 100%;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--wood);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}