/* ========================================
   湖城互联 - 全局样式库
   Glass Tea Table Style - 玻璃茶几风
   ======================================== */

:root {
    --glass-white: rgba(255, 255, 255, 0.85);
    --glass-dark: rgba(30, 30, 30, 0.9);
    --glass-light: rgba(240, 240, 240, 0.8);
    --ink-black: #1a1a1a;
    --soft-gray: #f5f5f7;
    --accent-blue: #2c5f8d;
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
    --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    color: var(--ink-black);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 30%, rgba(44, 95, 141, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(44, 95, 141, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ========================================
   导航栏样式
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 5%;
    transition: var(--transition-smooth);
    background: transparent;
}

.navbar.scrolled {
    background: var(--glass-white);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-soft);
    padding: 0.7rem 5%;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--ink-black);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.logo img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 12px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text span:first-child {
    font-size: 1.3rem;
    font-weight: 700;
}

.logo-text span:last-child {
    font-size: 0.7rem;
    color: #666;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--ink-black);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition-smooth);
}

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

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

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-blue);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--ink-black);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

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

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ========================================
   页脚样式
   ======================================== */
.footer {
    background: var(--glass-dark);
    color: #fff;
    padding: 4rem 5% 2rem;
    margin-top: 5rem;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent-blue);
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    line-height: 2;
    text-decoration: none;
    display: block;
    transition: var(--transition-smooth);
}

.footer-section a:hover {
    color: #fff;
    padding-left: 5px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 3rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 5%;
}

.section {
    padding: 6rem 5%;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--accent-blue);
}

.section-title p {
    color: #666;
    font-size: 1.1rem;
    max-width: 600px;
    margin: 1.5rem auto 0;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--accent-blue);
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
}

.btn:hover {
    background: transparent;
    color: var(--accent-blue);
    border-color: var(--accent-blue);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-outline {
    background: transparent;
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

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

/* ========================================
   椭圆形模块布局
   ======================================== */
.ellipse-section {
    position: relative;
    padding: 4rem 0;
    overflow: hidden;
}

.ellipse-bg {
    position: absolute;
    border-radius: 50%;
    background: var(--glass-white);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-soft);
    z-index: -1;
}

.ellipse-1 {
    width: 400px;
    height: 300px;
    top: 10%;
    left: -100px;
    transform: rotate(-15deg);
}

.ellipse-2 {
    width: 350px;
    height: 280px;
    top: 40%;
    right: -80px;
    transform: rotate(20deg);
}

.ellipse-3 {
    width: 300px;
    height: 250px;
    bottom: 10%;
    left: 20%;
    transform: rotate(-10deg);
}

.ellipse-4 {
    width: 380px;
    height: 320px;
    bottom: 20%;
    right: 15%;
    transform: rotate(15deg);
}

/* ========================================
   卡片样式
   ======================================== */
.card {
    background: var(--glass-white);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 16px;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--ink-black);
}

.card-excerpt {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #999;
    font-size: 0.85rem;
}

/* ========================================
   动画效果
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-smooth);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .nav-links {
        gap: 1.5rem;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .ellipse-1,
    .ellipse-2,
    .ellipse-3,
    .ellipse-4 {
        opacity: 0.5;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--glass-white);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transition: var(--transition-smooth);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .section {
        padding: 4rem 5%;
    }
    
    .section-title h2 {
        font-size: 1.75rem;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .ellipse-bg {
        opacity: 0.3;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .logo-text span:first-child {
        font-size: 1.1rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .card-image {
        height: 180px;
    }
}