/* ========================================
   HKEA.CN - GEO 域名营销官网全局样式
   茶叶简约风 | 墨绿 + 米白 + 浅灰
   ======================================== */

/* CSS Reset & 基础变量 */
:root {
    --color-primary: #2d5016;      /* 墨绿主色 */
    --color-secondary: #f5f1e8;    /* 米白背景 */
    --color-accent: #8b9a7d;       /* 浅绿点缀 */
    --color-text: #333333;         /* 深灰文字 */
    --color-light: #f9f9f9;        /* 浅灰背景 */
    --color-white: #ffffff;
    --color-border: #e0e0e0;
    --shadow-soft: 0 4px 20px rgba(45, 80, 22, 0.08);
    --shadow-hover: 0 8px 30px rgba(45, 80, 22, 0.15);
    --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-secondary);
    color: var(--color-text);
    line-height: 1.8;
    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;
}

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition-smooth);
    padding: 20px 0;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

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

.nav-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 8px 0;
}

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

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

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--color-primary);
    transition: var(--transition-smooth);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 60px 0 30px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--color-accent);
}

.footer-section p,
.footer-section li {
    font-size: 14px;
    line-height: 2;
    color: rgba(255, 255, 255, 0.8);
}

.footer-section ul li {
    margin-bottom: 10px;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 30px;
    text-align: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 42px;
    color: var(--color-primary);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--color-accent);
}

.section-title p {
    font-size: 18px;
    color: #666;
    max-width: 600px;
    margin: 20px auto 0;
}

.btn {
    display: inline-block;
    padding: 14px 35px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition-smooth);
    border: 2px solid var(--color-primary);
}

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

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

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

/* ========================================
   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) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title h2 {
        font-size: 36px;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--color-white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        transition: var(--transition-smooth);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .container {
        padding: 0 20px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 24px;
    }
    
    .btn {
        padding: 12px 25px;
        font-size: 14px;
    }
}