/* ========================================
   煜园建筑装饰 - 极简高端商务风格
   深色系配色方案
   ======================================== */

/* CSS Variables */
:root {
    /* 背景色 */
    --bg-primary: #1A1A1A;
    --bg-secondary: #333333;
    --bg-tertiary: #2A2A2A;
    --bg-card: #252525;
    
    /* 点缀色 */
    --accent-gold: #D4AF37;
    --accent-gold-light: #E8C547;
    --accent-brown: #8B7355;
    --accent-brown-light: #A08060;
    
    /* 文字色 */
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-muted: #808080;
    --text-gold: #D4AF37;
    
    /* 边框 */
    --border-color: #444444;
    --border-gold: rgba(212, 175, 55, 0.3);
    
    /* 字体 */
    --font-primary: 'Montserrat', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Montserrat', sans-serif;
    
    /* 间距 */
    --section-padding: 120px;
    --container-max: 1280px;
    
    /* 过渡 */
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    overscroll-behavior: none;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }

p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    background: rgba(26, 26, 26, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 2px;
}

.logo span {
    color: var(--accent-gold);
}

.nav-links {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-secondary);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gold);
    transition: var(--transition-smooth);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    width: 48px;
    height: 48px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    position: relative;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    transition: var(--transition-smooth);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-smooth);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(212, 175, 55, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 115, 85, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

.hero-brand {
    font-size: clamp(2rem, 8vw, 5rem);
    font-weight: 700;
    letter-spacing: clamp(8px, 2vw, 24px);
    color: var(--text-primary);
    margin-bottom: 20px;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: 1.1rem;
    letter-spacing: 6px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 40px;
    font-weight: 500;
    opacity: 0.9;
}

.hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    margin-bottom: 32px;
    line-height: 1.3;
    letter-spacing: 8px;
}

.hero-title .highlight {
    color: var(--accent-gold);
    font-weight: 600;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 48px;
    line-height: 1.8;
    letter-spacing: 1px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 40px;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: 0;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
    min-height: 48px;
    min-width: 48px;
}

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

.btn-primary:hover {
    background: transparent;
    color: var(--accent-gold);
}

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

.btn-outline:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
}

/* Section Base */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

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

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 80px;
}

.section-label {
    font-size: 0.8rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 16px;
    font-weight: 600;
}

.section-title {
    margin-bottom: 24px;
}

.section-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 48px 32px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent-gold);
    transform: scaleX(0);
    transition: var(--transition-smooth);
}

.service-card:hover {
    border-color: var(--border-gold);
    transform: translateY(-8px);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    font-size: 2.5rem;
    color: var(--accent-gold);
    margin-bottom: 24px;
}

.service-title {
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.service-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Stats Section */
.stats-section {
    background: var(--bg-tertiary);
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 20px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-gold);
    margin-bottom: 8px;
    font-family: var(--font-display);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Cases Section */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.case-card {
    position: relative;
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

.case-image {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    transition: var(--transition-smooth);
}

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

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 40px;
    background: linear-gradient(transparent, rgba(26, 26, 26, 0.95));
}

.case-title {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.case-category {
    font-size: 0.85rem;
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 24px;
}

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

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.about-feature i {
    font-size: 1.5rem;
    color: var(--accent-gold);
    margin-top: 4px;
}

.about-feature h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.about-feature p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border: 1px solid var(--border-color);
}

.about-image::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 20px;
    right: -20px;
    bottom: -20px;
    border: 2px solid var(--accent-gold);
    z-index: -1;
}

/* Vision Section */
.vision-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.vision-text {
    padding: 40px 0;
}

.vision-quote {
    margin-top: 50px;
    padding: 60px;
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.05) 0%, rgba(139, 115, 85, 0.05) 100%);
    border: 1px solid var(--border-gold);
    position: relative;
}

.vision-quote::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: 30px;
    font-size: 6rem;
    color: var(--accent-gold);
    opacity: 0.3;
    font-family: Georgia, serif;
    line-height: 1;
}

.vision-main {
    font-size: 1.5rem;
    line-height: 2;
    color: var(--text-primary);
    margin-bottom: 30px;
    font-weight: 500;
}

.vision-sub {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.vision-brand {
    font-size: 1rem;
    color: var(--accent-gold);
    letter-spacing: 4px;
    text-transform: uppercase;
    font-weight: 600;
    padding-top: 30px;
    border-top: 1px solid var(--border-gold);
}

@media (max-width: 768px) {
    .vision-quote {
        padding: 40px 24px;
    }
    
    .vision-main {
        font-size: 1.2rem;
    }
    
    .vision-sub {
        font-size: 1rem;
    }
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 24px;
}

.contact-details {
    margin-top: 40px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--accent-gold);
    width: 24px;
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-item p {
    color: var(--text-secondary);
}

.contact-form {
    background: var(--bg-card);
    padding: 48px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-gold);
}

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

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-logo span {
    color: var(--accent-gold);
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Scroll to Top Button */
.scroll-top {
    position: fixed;
    bottom: 90px;
    right: 20px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #c9a962 0%, #8b7d65 100%);
    color: var(--bg-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(201, 169, 98, 0.4);
    font-size: 1.2rem;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--accent-gold-light);
    transform: translateY(-4px);
}

/* Responsive Design */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .about-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        height: 70px;
    }
    
    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(26, 26, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        gap: 0;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li {
        width: 100%;
    }
    
    .nav-links a {
        display: block;
        padding: 16px 24px;
        font-size: 1rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links a::after {
        display: none;
    }
    
    .nav-links a:hover {
        background: rgba(212, 175, 55, 0.1);
    }
    
    .services-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }
    
    .contact-form {
        padding: 32px;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .btn {
        padding: 14px 28px;
        font-size: 0.8rem;
        min-height: 48px;
    }
    
    .section-header {
        margin-bottom: 50px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    
    .stat-number {
        font-size: 1.75rem;
    }
    
    .stat-label {
        font-size: 0.8rem;
    }
    
    .contact-form {
        padding: 24px;
    }
    
    .scroll-top {
        width: 48px;
        height: 48px;
        bottom: 90px;
        right: 20px;
        font-size: 1rem;
    }
    
    .social-float-container {
        bottom: 30px !important;
        right: 20px !important;
        z-index: 10000 !important;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease forwards;
}

/* Selection Color */
::selection {
    background: var(--accent-gold);
    color: var(--bg-primary);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-brown);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-gold);
}

/* Case View Button */
.case-view-btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--accent-gold);
    color: var(--bg-primary);
    border: none;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition-smooth);
    margin-top: 16px;
}

.case-view-btn:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
}

/* Cases Load More Button */
.cases-load-more {
    text-align: center;
    margin-top: 60px;
}

.cases-load-more .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    background: transparent;
    border: 2px solid var(--accent-gold);
    color: var(--accent-gold);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.cases-load-more .btn-secondary:hover {
    background: var(--accent-gold);
    color: var(--bg-primary);
}

.cases-load-more .btn-secondary i {
    font-size: 0.875rem;
}

/* Case Modal */
.case-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    padding: 40px 20px;
    overflow-y: auto;
}

.case-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-modal-content {
    background: var(--bg-secondary);
    max-width: 900px;
    width: 100%;
    position: relative;
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.case-modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition-fast);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-modal-close:hover {
    background: var(--accent-gold);
    color: var(--bg-primary);
}

.case-modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
}

.case-modal-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 400px;
}

.case-modal-info {
    padding: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.case-modal-category {
    font-size: 0.85rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 16px;
}

.case-modal-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 24px;
    line-height: 1.3;
}

.case-modal-details {
    margin-bottom: 40px;
}

.case-modal-details p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

@media (max-width: 768px) {
    .case-modal-body {
        grid-template-columns: 1fr;
    }
    
    .case-modal-image {
        min-height: 250px;
    }
    
    .case-modal-info {
        padding: 40px 24px;
    }
    
    .case-modal-title {
        font-size: 1.5rem;
    }
}