/* 基础变量定义 */
:root {
    --primary: #0057C2;
    --primary-dark: #004299;
    --primary-light: #1F75DD;
    --accent: #00E5FF;
    --accent-alt: #FF9933;
    --success: #00DC82;
    --error: #FF4D94;
    --warning: #FFB800;
    --dark: #0A2140;
    --dark-blue: #0A1A3F;
    --gray-dark: #2A3A59;
    --gray: #6E7A99;
    --gray-light: #ECF0F9;
    --white: #ffffff;
    
    --gradient-primary: linear-gradient(135deg, #0057C2, #0081FF);
    --gradient-voice: linear-gradient(135deg, #00E5FF, #00AEFF);
    --gradient-love: linear-gradient(135deg, #FF9933, #FFB870);
    --gradient-dark: linear-gradient(135deg, #0A2140, #0A1A3F);
    
    --shadow-sm: 0 4px 6px rgba(10, 33, 64, 0.05), 0 1px 3px rgba(10, 33, 64, 0.1);
    --shadow-md: 0 5px 15px rgba(10, 33, 64, 0.07), 0 3px 6px rgba(10, 33, 64, 0.12);
    --shadow-lg: 0 10px 25px rgba(10, 33, 64, 0.1), 0 5px 10px rgba(10, 33, 64, 0.08);
    --shadow-hover: 0 15px 35px rgba(10, 33, 64, 0.15), 0 8px 20px rgba(10, 33, 64, 0.12);
    --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.4);
    --shadow-glow-orange: 0 0 20px rgba(255, 153, 51, 0.4);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-xxxl: 64px;
    
    --font-sans: 'PingFang SC', 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'SFMono-Regular', Consolas, monospace;
    
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-medium: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    
    --container-width: 1200px;
}

/* 基础重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 62.5%;
}

body {
    font-family: var(--font-sans);
    font-size: 1.6rem;
    line-height: 1.6;
    color: var(--gray-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--dark);
}

h1 {
    font-size: 5.6rem;
    letter-spacing: -0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: 4rem;
    letter-spacing: -0.01em;
    position: relative;
    display: inline-block;
}

h2:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--accent);
    border-radius: 3px;
}

h3 {
    font-size: 2.4rem;
}

p {
    margin-bottom: var(--spacing-lg);
    color: var(--gray-dark);
}

button, .btn {
    cursor: pointer;
    font-family: inherit;
    font-size: 1.6rem;
    border: none;
    background: none;
    outline: none;
}

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

ul, ol {
    list-style: none;
}

/* 布局类 */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.section {
    padding: var(--spacing-xxxl) 0;
    position: relative;
    overflow: hidden;
}

.section-dark {
    background-color: var(--dark-blue);
    color: var(--white);
}

.section-dark p {
    color: var(--gray-light);
}

.section-gradient {
    background: var(--gradient-dark);
    color: var(--white);
}

.section-gradient p {
    color: var(--gray-light);
}

.section-light {
    background-color: var(--white);
    color: var(--gray-dark);
}

.section-blue {
    background-color: #F0F8FF;
    color: var(--gray-dark);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    position: relative;
}

/* 文本样式 */
.gradient-text {
    background: var(--gradient-voice);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

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

.accent-text {
    color: var(--accent);
}

.accent-alt-text {
    color: var(--accent-alt);
}

/* Flex 布局 */
.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* 装饰元素 */
.decorator {
    position: absolute;
    pointer-events: none;
    opacity: 0.5;
    z-index: 0;
}

.circle-decorator {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: var(--primary);
    filter: blur(80px);
}

.grid-decorator {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(rgba(0, 70, 184, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 70, 184, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 0;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1.2rem 2.4rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
    text-align: center;
    position: relative;
    overflow: hidden;
    z-index: 1;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(0, 70, 184, 0.3);
}

.btn-primary:hover {
    color: var(--white);
    box-shadow: var(--shadow-lg), 0 0 20px 0 rgba(0, 70, 184, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(0, 70, 184, 0.1);
    color: var(--primary);
    border: 1px solid rgba(0, 70, 184, 0.2);
}

.btn-secondary:hover {
    background: rgba(0, 70, 184, 0.15);
    color: var(--primary-dark);
    border-color: rgba(0, 70, 184, 0.3);
    transform: translateY(-2px);
}

.btn-accent {
    background: var(--gradient-voice);
    color: var(--dark);
    font-weight: 700;
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(0, 229, 255, 0.3);
}

.btn-accent:hover {
    box-shadow: var(--shadow-lg), 0 0 20px 5px rgba(0, 229, 255, 0.4);
    transform: translateY(-2px);
    color: var(--dark);
}

.btn-love {
    background: var(--gradient-love);
    color: var(--dark);
    font-weight: 700;
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(255, 153, 51, 0.3);
}

.btn-love:hover {
    box-shadow: var(--shadow-lg), 0 0 20px 5px rgba(255, 153, 51, 0.4);
    transform: translateY(-2px);
    color: var(--dark);
}

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

.btn-outline:hover {
    background: rgba(0, 229, 255, 0.1);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.3);
}

.btn .btn-icon {
    margin-left: var(--spacing-sm);
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

.btn-lg {
    padding: 1.6rem 3.2rem;
    font-size: 1.8rem;
    border-radius: var(--radius-lg);
}

/* 辅助类 */
.no-wrap {
    white-space: nowrap;
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.animate-fade-in {
    animation: fadeIn 0.8s ease forwards;
}

.animate-slide-up {
    animation: slideUp 0.8s ease forwards;
}

/* 无障碍支持 */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 10000;
    padding: .5rem 1rem;
    background: #000;
    color: #fff;
    border-radius: .25rem;
}

/* 动画减少 */
@media (prefers-reduced-motion: reduce) {
    * {
        -webkit-animation: none !important;
        animation: none !important;
        transition: none !important;
    }
}

/* 错误消息 */
.error-message {
    color: #d93025;
    font-size: .875rem;
    margin-top: .25rem;
}

.form-control.error {
    border-color: #d93025;
}