/* ========================================
   营销型网站建设 - 全局样式
   风格：轻奢商务高级灰 + 哑光金点缀
   布局：斜切非对称分区布局
======================================== */

:root {
    --primary-dark: #1a1a2e;
    --primary-gray: #2d2d44;
    --accent-gold: #c9a961;
    --accent-gold-light: #e0c88a;
    --text-white: #ffffff;
    --text-light: #f5f5f7;
    --text-muted: #a0a0b0;
    --bg-light: #f8f9fa;
    --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 100%);
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.15);
    --shadow-gold: 0 5px 20px rgba(201, 169, 97, 0.3);
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--primary-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 5%;
}

/* ========================================
   导航栏样式
======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-smooth);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(26, 26, 46, 0.98);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.2);
}

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

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: 2px;
}

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

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    color: var(--text-light);
    font-size: 15px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    padding: 5px 0;
}

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

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

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-white);
    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(--primary-dark);
    color: var(--text-muted);
    padding: 80px 0 40px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-gold), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 60px;
    margin-bottom: 60px;
}

.footer-section h3 {
    color: var(--text-light);
    font-size: 18px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 15px;
}

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

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-muted);
    transition: var(--transition-smooth);
}

.footer-links a:hover {
    color: var(--accent-gold);
    padding-left: 10px;
}

.contact-info li {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-link {
    width: 40px;
    height: 40px;
    border: 1px solid var(--accent-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-gold);
    transition: var(--transition-smooth);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
}

/* ========================================
   按钮样式
======================================== */

.btn {
    display: inline-block;
    padding: 15px 35px;
    font-size: 15px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background: var(--accent-gold-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-gold);
}

.btn-outline {
    background: transparent;
    color: var(--accent-gold);
    border: 2px solid var(--accent-gold);
}

.btn-outline:hover {
    background: var(--accent-gold);
    color: var(--primary-dark);
    transform: translateY(-3px);
}

/* ========================================
   动画效果
======================================== */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ========================================
   响应式设计
======================================== */

@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--primary-dark);
        flex-direction: column;
        padding: 100px 40px;
        gap: 30px;
        transition: var(--transition-smooth);
    }

    .nav-menu.active {
        right: 0;
    }

    .hamburger {
        display: flex;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .logo {
        font-size: 24px;
    }

    .footer-content {
        gap: 40px;
    }
}