/* ==========================================================================
   亿骏通讯官网设计系统与全局样式 (style.css)
   ========================================================================== */

/* 1. 全局设计变量 */
:root {
    /* 色彩系统 */
    --color-bg-dark: #060713;
    --color-bg-light: #f6f8ff;
    --color-card-dark: #0f1026;
    --color-card-light: #ffffff;
    
    --color-text-white: #ffffff;
    --color-text-dark: #121424;
    --color-text-muted-light: rgba(255, 255, 255, 0.7);
    --color-text-muted-dark: #585d83;
    
    --primary-blue: #0b0c3f;
    --primary-magenta: #a50a73;
    --primary-pink: #e21e5c;
    
    /* 渐变组合 */
    --primary-gradient: linear-gradient(135deg, #07081a 0%, #151152 40%, #a50a73 80%, #e21e5c 100%);
    --accent-gradient: linear-gradient(90deg, #a50a73 0%, #e21e5c 100%);
    --blue-gradient: linear-gradient(135deg, #0b0c3f 0%, #1c117b 100%);
    --card-glow-gradient: linear-gradient(135deg, rgba(165, 10, 115, 0.15) 0%, rgba(226, 30, 92, 0.05) 100%);
    --glass-background: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    /* 字体与阴影 */
    --font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(226, 30, 92, 0.35);
    
    /* 圆角与间距 */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. 重置与基本样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-dark);
    color: var(--color-text-white);
    line-height: 1.6;
    overflow-x: hidden;
}

ul {
    list-style: none;
}

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

/* 3. 公共基础布局与组件 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted-light);
    max-width: 600px;
    margin: 0 auto;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--color-text-white);
    box-shadow: 0 4px 14px rgba(226, 30, 92, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--glass-background);
    color: var(--color-text-white);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: var(--primary-pink);
}

.btn-block {
    display: flex;
    width: 100%;
}