/* 全局样式 - TikTok 营销工具主题 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #fe0979; /* 霓虹粉 */
    --secondary-color: #00f2ea; /* 霓虹青 */
    --bg-dark: #0f0f11;
    --bg-card: #1a1a1d;
    --text-main: #f1f1f1;
    --text-muted: #a0a0a0;
    --border-color: #2c2c30;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-dark);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

ul {
    list-style: none;
}

/* 导航栏 */
header {
    background-color: rgba(15, 15, 17, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    font-size: 1.05rem;
    color: var(--text-muted);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-main);
    text-shadow: 0 0 10px rgba(254, 9, 121, 0.5);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: linear-gradient(45deg, var(--primary-color), #d8005b);
    color: white;
    border-radius: 8px;
    font-weight: bold;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(254, 9, 121, 0.4);
    color: white;
}

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

.btn-outline:hover {
    background: var(--secondary-color);
    color: var(--bg-dark);
    box-shadow: 0 5px 15px rgba(0, 242, 234, 0.4);
}

/* 英雄区域 (Hero Section) */
.hero {
    position: relative;
    padding: 8rem 2rem;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(254, 9, 121, 0.1) 0%, rgba(15, 15, 17, 1) 50%);
    z-index: -1;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
    line-height: 1.2;
}

.hero h1 span {
    background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 3rem;
    color: var(--text-muted);
}

.hero-btns {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

/* 章节通用样式 */
.section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: 3.5rem;
    font-weight: 700;
}

/* 卡片网格 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-card);
    padding: 3rem 2rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

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

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    padding: 1rem;
    background: rgba(254, 9, 121, 0.1);
    border-radius: 12px;
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 1rem;
}

/* 徽章 */
.badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    background: rgba(0, 242, 234, 0.1);
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* 数据展示 */
.stats-container {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 2rem;
    background: var(--bg-card);
    padding: 4rem 2rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

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

.stat-num {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    color: var(--text-muted);
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 页脚 */
footer {
    background-color: #080809;
    border-top: 1px solid var(--border-color);
    padding: 5rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-col h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-col a {
    color: var(--text-muted);
}

.footer-col a:hover {
    color: var(--secondary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 1rem;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea.form-control {
    resize: vertical;
    min-height: 150px;
}

/* 内部页面标题 */
.page-header {
    text-align: center;
    padding: 6rem 2rem;
    background: linear-gradient(180deg, rgba(254,9,121,0.05) 0%, var(--bg-dark) 100%);
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}