/* ========================================
   璟玺台 - 高端楼盘网站样式
   设计风格：深沉、高端、时尚
   ======================================== */

/* 基础重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 深沉金色系 */
    --primary: #c9a962;
    --primary-dark: #a88a4a;
    --primary-light: #e5d5a8;
    
    /* 背景色 - 深灰/黑色系 */
    --bg-dark: #0a0a0a;
    --bg-darker: #050505;
    --bg-light: #1a1a1a;
    --bg-lighter: #2a2a2a;
    
    /* 文字色 */
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    
    /* 边框色 */
    --border: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.05);
    
    /* 字体 */
    --font-serif: 'Noto Serif SC', serif;
    --font-sans: 'Noto Sans SC', sans-serif;
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    
    /* 过渡 */
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ========================================
   导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 2rem;
    color: var(--primary);
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.1em;
}

.nav {
    display: flex;
    gap: var(--space-md);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: var(--space-xs) 0;
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ========================================
   Hero 主视觉区
   ======================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-slider {
    position: absolute;
    inset: 0;
}

.hero-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease, visibility 1s ease;
}

.hero-slide.active {
    opacity: 1;
    visibility: visible;
}

.hero-content {
    text-align: center;
    padding: var(--space-md);
    max-width: 800px;
    animation: fadeInUp 1s ease forwards;
}

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

.hero-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--primary);
    color: var(--primary);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-md);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 700;
    letter-spacing: 0.3em;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 50%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-family: var(--font-serif);
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--text-secondary);
    letter-spacing: 0.5em;
    margin-bottom: var(--space-md);
}

.hero-desc {
    font-size: 1rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    line-height: 1.8;
}

.hero-nav {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--space-sm);
}

.hero-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--border);
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
}

.hero-dot.active {
    background: var(--primary);
    border-color: var(--primary);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-lg);
    right: var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--primary), transparent);
    animation: scrollPulse 2s ease infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* ========================================
   通用区块样式
   ======================================== */
section {
    padding: var(--space-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-header.light {
    color: var(--text-primary);
}

.section-tag {
    display: inline-block;
    color: var(--primary);
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.1em;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    letter-spacing: 0.05em;
}

/* ========================================
   核心价值
   ======================================== */
.features {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.feature-card {
    background: var(--bg-darker);
    border: 1px solid var(--border);
    padding: var(--space-lg);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--primary);
    border-radius: 50%;
}

.feature-icon i {
    font-size: 2rem;
    color: var(--primary);
}

.feature-card h3 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    margin-bottom: var(--space-sm);
    color: var(--primary);
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   项目介绍
   ======================================== */
.about {
    background: var(--bg-dark);
}

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

.about-image {
    position: relative;
}

.image-frame {
    position: relative;
    padding: var(--space-sm);
    border: 1px solid var(--border);
}

.image-frame::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: 10px;
    bottom: 10px;
    border: 1px solid var(--primary);
    pointer-events: none;
}

.image-placeholder {
    aspect-ratio: 4/3;
    background: var(--bg-lighter);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    color: var(--text-muted);
}

.image-placeholder i {
    font-size: 4rem;
    opacity: 0.5;
}

.about-content {
    padding: var(--space-md);
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}

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

.stat-number {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-unit {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: var(--space-xs);
}

/* ========================================
   户型展示
   ======================================== */
.houses {
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-light) 100%);
}

.houses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
}

.house-card {
    background: var(--bg-darker);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
}

.house-card:hover {
    border-color: var(--primary);
}

.house-image {
    position: relative;
}

.house-placeholder {
    aspect-ratio: 16/10;
    background: var(--bg-lighter);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    color: var(--text-muted);
}

.house-placeholder i {
    font-size: 3rem;
    opacity: 0.5;
}

.house-info {
    padding: var(--space-md);
}

.house-info h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    margin-bottom: var(--space-sm);
    color: var(--primary);
}

.house-features {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xs);
}

.house-features li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.house-features li i {
    color: var(--primary);
    font-size: 0.8rem;
}

/* ========================================
   周边配套
   ======================================== */
.surroundings {
    background: var(--bg-light);
}

.surroundings-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--bg-dark);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.surrounding-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.surrounding-card {
    background: var(--bg-darker);
    border: 1px solid var(--border);
    padding: var(--space-md);
    text-align: center;
    transition: var(--transition);
}

.surrounding-card:hover {
    border-color: var(--primary);
}

.surrounding-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--primary);
    border-radius: 50%;
}

.surrounding-icon i {
    font-size: 1.5rem;
    color: var(--primary);
}

.surrounding-card h4 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.surrounding-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
}

.distance {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--border);
    color: var(--primary);
    font-size: 0.8rem;
    border-radius: 20px;
}

/* ========================================
   皖西南风光
   ======================================== */
.landscape {
    background: var(--bg-dark);
}

.landscape-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
}

.landscape-item {
    position: relative;
    overflow: hidden;
}

.landscape-item.large {
    grid-column: span 2;
    grid-row: span 2;
}

.landscape-placeholder {
    aspect-ratio: 1;
    background: var(--bg-lighter);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    color: var(--text-muted);
    transition: var(--transition);
}

.landscape-item.large .landscape-placeholder {
    aspect-ratio: 1;
}

.landscape-placeholder i {
    font-size: 2.5rem;
    opacity: 0.5;
}

.landscape-placeholder:hover {
    background: var(--bg-light);
}

/* ========================================
   实景展示
   ======================================== */
.gallery {
    background: var(--bg-light);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

.gallery-item {
    position: relative;
    overflow: hidden;
}

.gallery-placeholder {
    aspect-ratio: 4/3;
    background: var(--bg-darker);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    color: var(--text-muted);
    transition: var(--transition);
}

.gallery-placeholder i {
    font-size: 2rem;
    opacity: 0.5;
}

.gallery-placeholder:hover {
    background: var(--primary);
    color: var(--bg-dark);
}

/* ========================================
   购房须知
   ======================================== */
.notice {
    background: var(--bg-darker);
    padding: var(--space-lg) 0;
}

.notice-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.notice-card {
    text-align: center;
    padding: var(--space-md);
    border: 1px solid var(--border);
}

.notice-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--primary);
    border-radius: 50%;
}

.notice-icon i {
    font-size: 1.5rem;
    color: var(--primary);
}

.notice-card h4 {
    font-family: var(--font-serif);
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    color: var(--text-secondary);
}

.notice-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.notice-big {
    font-family: var(--font-serif);
    font-size: 1.5rem !important;
    color: var(--primary) !important;
}

/* ========================================
   底部区域
   ======================================== */
.footer {
    background: var(--bg-dark);
}

.footer-main {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr 1fr;
    gap: var(--space-lg);
}

.footer-tagline {
    color: var(--text-muted);
    margin-top: var(--space-sm);
    font-size: 0.95rem;
}

.footer-links h4,
.footer-contact h4 {
    font-family: var(--font-serif);
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.footer-links ul,
.footer-contact ul {
    list-style: none;
}

.footer-links li,
.footer-contact li {
    margin-bottom: var(--space-xs);
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-contact li {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-contact i {
    color: var(--primary);
    width: 20px;
}

.qr-placeholder {
    aspect-ratio: 1;
    background: var(--bg-lighter);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.qr-placeholder i {
    font-size: 3rem;
    opacity: 0.5;
}

.footer-bottom {
    padding: var(--space-md) 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-dark);
        flex-direction: column;
        padding: var(--space-md);
        border-bottom: 1px solid var(--border);
    }
    
    .nav.active {
        display: flex;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .notice-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .landscape-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .landscape-item.large {
        grid-column: span 2;
        grid-row: span 1;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        letter-spacing: 0.15em;
    }
    
    .hero-subtitle {
        letter-spacing: 0.2em;
    }
    
    .landscape-grid {
        grid-template-columns: 1fr;
    }
    
    .landscape-item.large {
        grid-column: span 1;
    }
}