/* ============================================
   兴伟达 - 工业地产门户 专业设计
   设计风格：专业稳重 + 现代科技感 + 大胆视觉
   ============================================ */

/* CSS Variables - 设计系统 */
:root {
    /* 主色调 - 深邃蓝 + 金色点缀 */
    --primary-900: #0a1628;
    --primary-800: #0f2744;
    --primary-700: #163a60;
    --primary-600: #1a4d7c;
    --primary-500: #1e6198;
    --primary-400: #3d8abf;
    --primary-300: #6bb0d4;
    --primary-200: #a8d1e8;
    --primary-100: #d4e9f7;
    --primary-50: #f0f7fc;

    /* 金色强调色 */
    --accent-gold: #d4a853;
    --accent-gold-light: #e8c97a;
    --accent-gold-dark: #b8923f;

    /* 中性色 - 带蓝色调 */
    --neutral-900: #1a2332;
    --neutral-800: #2a3548;
    --neutral-700: #3a4558;
    --neutral-600: #5a6578;
    --neutral-500: #8a95a8;
    --neutral-400: #b0b8c8;
    --neutral-300: #d0d8e0;
    --neutral-200: #e8ecf0;
    --neutral-100: #f4f6f8;
    --neutral-50: #fafbfc;

    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    /* 阴影系统 */
    --shadow-sm: 0 1px 2px rgba(10, 22, 40, 0.05);
    --shadow-md: 0 4px 12px rgba(10, 22, 40, 0.08);
    --shadow-lg: 0 8px 30px rgba(10, 22, 40, 0.12);
    --shadow-xl: 0 20px 50px rgba(10, 22, 40, 0.18);
    --shadow-glow: 0 0 40px rgba(26, 115, 232, 0.15);

    /* 圆角系统 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* 过渡 */
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 150ms var(--ease-out-quart);
    --transition-base: 250ms var(--ease-out-quart);
    --transition-slow: 400ms var(--ease-out-expo);
}

/* 字体 - 使用系统字体栈优化（国内可访问） */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    background-color: var(--neutral-50);
    color: var(--neutral-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   顶部导航栏 - 专业商务风格
   ============================================ */
.top-bar {
    background: var(--primary-900);
    padding: 12px 0;
    position: relative;
    z-index: 100;
}

.top-bar::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    opacity: 0.4;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-dark));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-900);
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    box-shadow: var(--shadow-md), 0 0 20px rgba(212, 168, 83, 0.3);
}

.logo-text h1 {
    font-size: 22px;
    font-weight: 700;
    color: white;
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.logo-text p {
    font-size: 12px;
    color: var(--neutral-400);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.user-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-register,
.btn-login {
    padding: 10px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-register {
    background: var(--accent-gold);
    color: var(--primary-900);
    border: none;
}

.btn-register:hover {
    background: var(--accent-gold-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(212, 168, 83, 0.4);
}

.btn-login {
    background: transparent;
    color: white;
    border: 1.5px solid var(--neutral-600);
}

.btn-login:hover {
    border-color: white;
    background: rgba(255, 255, 255, 0.05);
}

/* ============================================
   主导航栏 - 玻璃态效果
   ============================================ */
.main-nav {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--neutral-200);
    position: sticky;
    top: 0;
    z-index: 99;
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 0;
    padding-bottom: 0;
}

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-links a {
    text-decoration: none;
    color: var(--neutral-700);
    font-weight: 500;
    font-size: 15px;
    padding: 20px 18px;
    position: relative;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-links a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-gold));
    border-radius: 3px 3px 0 0;
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--primary-600);
}

.nav-links a:hover::before {
    width: 60%;
}

.nav-links a.active {
    color: var(--primary-600);
}

.nav-links a.active::before {
    width: 100%;
}

.nav-icon-small {
    font-size: 14px;
    opacity: 0.7;
}

.free-post-btn {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.free-post-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.free-post-btn:hover::before {
    left: 100%;
}

.free-post-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(26, 115, 232, 0.25);
}

.free-post-btn .plus-icon {
    font-size: 18px;
    font-weight: 300;
}

/* ============================================
   搜索区域 - 全宽渐变背景
   ============================================ */
.search-section {
    background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-800) 50%, var(--primary-700) 100%);
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
}

.search-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(212, 168, 83, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(26, 115, 232, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.search-section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    opacity: 0.6;
}

.search-title {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    z-index: 1;
}

.search-title h2 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 800;
    color: white;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.search-title p {
    font-size: 18px;
    color: var(--neutral-300);
    font-weight: 400;
}

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

/* 搜索框 - 玻璃态卡片 */
.search-box {
    background: rgba(255, 255, 255, 0.97);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-xl), 0 0 60px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.search-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.search-row {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
}

.search-label {
    font-size: 14px;
    color: var(--neutral-600);
    font-weight: 600;
    min-width: 70px;
    padding-top: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.search-label svg {
    width: 16px;
    height: 16px;
    opacity: 0.6;
}

.search-options {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    flex: 1;
}

.search-option {
    padding: 10px 16px;
    border: 1.5px solid var(--neutral-300);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    background: white;
    color: var(--neutral-700);
    user-select: none;
    white-space: nowrap;
}

.search-option:hover {
    border-color: var(--primary-400);
    color: var(--primary-600);
    background: var(--primary-50);
}

.search-option.active {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    border-color: var(--primary-600);
    color: white;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(26, 115, 232, 0.3);
}

.search-option.city-option {
    font-weight: 700;
    border-color: var(--accent-gold);
    color: var(--accent-gold-dark);
    background: linear-gradient(135deg, rgba(212, 168, 83, 0.1), rgba(212, 168, 83, 0.05));
}

.search-option.city-option.active {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-dark));
    border-color: var(--accent-gold);
    color: var(--primary-900);
    box-shadow: 0 2px 12px rgba(212, 168, 83, 0.4);
}

.custom-range {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    padding-top: 6px;
}

.custom-range input {
    width: 90px;
    padding: 10px 14px;
    border: 1.5px solid var(--neutral-300);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-800);
    background: white;
    transition: all var(--transition-fast);
}

.custom-range input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.custom-range input::placeholder {
    color: var(--neutral-400);
}

.custom-range span {
    color: var(--neutral-500);
    font-size: 14px;
    font-weight: 500;
}

.search-btn-row {
    display: flex;
    justify-content: center;
    margin-top: 8px;
}

.search-btn {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-dark));
    color: var(--primary-900);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 56px;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.search-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.search-btn:hover::before {
    left: 100%;
}

.search-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(212, 168, 83, 0.5);
}

.search-btn svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   房源展示区域 - 卡片网格
   ============================================ */
.property-section {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--neutral-50) 0%, white 100%);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--neutral-200);
    position: relative;
}

.section-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 80px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-gold), transparent);
}

.section-title-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--neutral-900);
    letter-spacing: -0.3px;
}

.section-subtitle {
    font-size: 15px;
    color: var(--neutral-500);
    font-weight: 400;
}

.view-all {
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.view-all:hover {
    background: var(--primary-50);
    color: var(--primary-700);
}

.view-all svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-base);
}

.view-all:hover svg {
    transform: translateX(4px);
}

/* 房源网格 */
.property-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* 房源卡片 - 悬停放大效果 */
.property-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-slow);
    position: relative;
    border: 1px solid var(--neutral-200);
}

.property-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.property-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--radius-xl);
    padding: 2px;
    background: linear-gradient(135deg, var(--primary-400), var(--accent-gold));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.property-card:hover::before {
    opacity: 1;
}

.property-image {
    height: 200px;
    background: linear-gradient(135deg, var(--neutral-200), var(--neutral-300));
    position: relative;
    overflow: hidden;
}

.property-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--ease-out-quart);
}

.property-card:hover .property-image img {
    transform: scale(1.08);
}

.property-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.3), transparent);
    pointer-events: none;
}

.property-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--accent-gold);
    color: var(--primary-900);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-md);
    z-index: 1;
}

.property-tag.sell {
    background: var(--success);
    color: white;
}

.property-tag.rent {
    background: var(--primary-600);
    color: white;
}

.property-content {
    padding: 20px;
}

.property-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--neutral-900);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.property-location {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--neutral-500);
    font-size: 13px;
    margin-bottom: 16px;
}

.property-location svg {
    width: 14px;
    height: 14px;
    color: var(--primary-500);
    flex-shrink: 0;
}

.property-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
    padding: 14px;
    background: var(--neutral-50);
    border-radius: var(--radius-md);
}

.detail-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.detail-value {
    font-size: 15px;
    font-weight: 700;
    color: var(--neutral-800);
    margin-bottom: 2px;
}

.detail-label {
    font-size: 11px;
    color: var(--neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.property-price {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--neutral-200);
}

.price-wrapper {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    gap: 4px;
}

.price-amount {
    font-size: 22px;
    font-weight: 800;
    color: var(--accent-gold-dark);
    line-height: 1;
}

.price-unit {
    font-size: 12px;
    color: var(--neutral-500);
}

/* 面积、层高一行显示 */
.property-details-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.pdr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 60px;
    padding: 8px 14px;
    background: var(--neutral-50);
    border-radius: var(--radius-md);
}

.pdr-value {
    font-size: 15px;
    font-weight: 700;
    color: var(--neutral-800);
    margin-bottom: 2px;
}

.pdr-label {
    font-size: 11px;
    color: var(--neutral-500);
}

.contact-btn {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: 10px 18px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: 6px;
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(26, 115, 232, 0.35);
}

.contact-btn svg {
    width: 14px;
    height: 14px;
}

/* ============================================
   服务优势区域 - 特色设计
   ============================================ */
.advantage-section {
    padding: 100px 0;
    background: linear-gradient(180deg, white 0%, var(--neutral-50) 100%);
    position: relative;
    overflow: hidden;
}

.advantage-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(ellipse, rgba(26, 115, 232, 0.03) 0%, transparent 70%);
    pointer-events: none;
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 50px;
}

.advantage-card {
    text-align: center;
    padding: 40px 28px;
    border-radius: var(--radius-xl);
    background: white;
    border: 1px solid var(--neutral-200);
    transition: all var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-gold));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

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

.advantage-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.advantage-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    transition: all var(--transition-base);
}

.advantage-card:hover .advantage-icon {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    transform: scale(1.1) rotate(5deg);
}

.advantage-card:hover .advantage-icon::after {
    filter: brightness(10);
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 14px;
    color: var(--neutral-600);
    line-height: 1.7;
}

/* ============================================
   数据统计区域 - 醒目设计
   ============================================ */
.stats-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-800) 100%);
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 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='%23ffffff' 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;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    position: relative;
    z-index: 1;
}

.stat-item {
    text-align: center;
    padding: 32px 24px;
    position: relative;
}

.stat-item::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 60px;
    width: 1px;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.stat-item:last-child::after {
    display: none;
}

.stat-number {
    font-size: 56px;
    font-weight: 800;
    color: white;
    margin-bottom: 8px;
    letter-spacing: -2px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    line-height: 1;
}

.stat-number .suffix {
    font-size: 28px;
    font-weight: 600;
    margin-left: 4px;
    opacity: 0.8;
}

.stat-label {
    font-size: 16px;
    color: var(--neutral-300);
    font-weight: 500;
    letter-spacing: 1px;
}

/* ============================================
   底部区域 - 专业设计
   ============================================ */
.footer {
    background: var(--neutral-900);
    color: white;
    padding: 80px 0 0;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-600), var(--accent-gold), var(--primary-600));
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 60px;
    border-bottom: 1px solid var(--neutral-700);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-brand .logo {
    margin-bottom: 8px;
}

.footer-brand .logo-icon {
    width: 56px;
    height: 56px;
    font-size: 22px;
}

.footer-brand .logo-text h1 {
    font-size: 26px;
}

.footer-brand p {
    color: var(--neutral-400);
    font-size: 14px;
    line-height: 1.8;
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--neutral-800);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--neutral-400);
    transition: all var(--transition-base);
    text-decoration: none;
    font-size: 18px;
}

.social-link:hover {
    background: var(--accent-gold);
    color: var(--primary-900);
    transform: translateY(-3px);
}

.footer-column h3 {
    font-size: 16px;
    font-weight: 700;
    color: white;
    margin-bottom: 24px;
    position: relative;
    padding-bottom: 12px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--accent-gold);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--neutral-400);
    text-decoration: none;
    font-size: 14px;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-links a:hover {
    color: var(--accent-gold);
    transform: translateX(4px);
}

.footer-links a::before {
    content: '›';
    font-size: 16px;
    opacity: 0;
    transition: all var(--transition-base);
}

.footer-links a:hover::before {
    opacity: 1;
}

.footer-bottom {
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.copyright {
    color: var(--neutral-500);
    font-size: 13px;
}

.copyright p {
    margin-bottom: 4px;
}

.footer-legal {
    display: flex;
    gap: 16px;
    align-items: center;
}

.footer-legal a {
    color: var(--neutral-500);
    text-decoration: none;
    font-size: 13px;
    transition: color var(--transition-base);
}

.footer-legal a:hover {
    color: var(--neutral-300);
}

.footer-legal span {
    color: var(--neutral-600);
    font-size: 12px;
}

/* ============================================
   动画系统
   ============================================ */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s var(--ease-out-expo) forwards;
    opacity: 0;
}

.animate-fade-in {
    animation: fadeIn 0.6s var(--ease-out-expo) forwards;
    opacity: 0;
}

.animate-slide-in {
    animation: slideInLeft 0.6s var(--ease-out-expo) forwards;
    opacity: 0;
}

.loading-placeholder {
    animation: pulse 1.5s ease-in-out infinite;
}

/* 滚动触发动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s var(--ease-out-expo);
}

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

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1200px) {
    .property-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .nav-links {
        display: none;
    }
    
    .property-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-item::after {
        display: none;
    }
}

@media (max-width: 768px) {
    .search-section {
        padding: 50px 0 60px;
    }
    
    .search-box {
        padding: 24px;
    }
    
    .search-row {
        flex-direction: column;
        gap: 12px;
    }
    
    .search-label {
        padding-top: 0;
    }
    
    .custom-range {
        margin-left: 0;
        width: 100%;
    }
    
    .property-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .advantage-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .stat-number {
        font-size: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .top-bar .container {
        flex-direction: column;
        gap: 12px;
    }
    
    .user-actions {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .search-btn {
        width: 100%;
        padding: 14px 24px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 36px;
    }
}

/* ============================================
   按钮组件
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.35);
}

.btn-secondary {
    background: white;
    color: var(--primary-600);
    border: 1.5px solid var(--primary-600);
}

.btn-secondary:hover {
    background: var(--primary-50);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-dark));
    color: var(--primary-900);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 168, 83, 0.4);
}