/* ========== 全局重置与基础样式 ========== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #111119;
    --color-bg-card: #16161f;
    --color-bg-card-hover: #1e1e2a;
    --color-blue: #C74BF7;
    --color-purple: #D02DE0;
    --color-purple-light: #B23FF3;
    --color-gradient: linear-gradient(135deg, #D02DE0, #B23FF3, #C74BF7);
    --color-gradient-reverse: linear-gradient(135deg, #C74BF7, #B23FF3, #D02DE0);
    --color-text: #f0f0f5;
    --color-text-secondary: #a0a0b8;
    --color-text-muted: #6a6a80;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-size-base: 16px;
    --max-width: 1200px;
    --nav-height: 72px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--color-purple-light);
}

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

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 700;
    color: var(--color-text);
}

h1 { font-size: 3.2rem; }
h2 { font-size: 2.4rem; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.25rem; }

p {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ========== 容器 ========== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== 通用按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--color-gradient);
    color: #fff;
    box-shadow: 0 4px 20px rgba(208, 45, 224, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(208, 45, 224, 0.45);
    color: #fff;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

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

/* ========== 段落标题区 ========== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-header h2 {
    margin-bottom: 16px;
}

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

.section-header p {
    font-size: 1.1rem;
}

/* ========== 卡片通用 ========== */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

/* ========== 渐变光晕 ========== */
.glow {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    pointer-events: none;
    z-index: 0;
}

.glow-purple {
    background: var(--color-purple);
}

.glow-blue {
    background: var(--color-blue);
}

/* ========== 动画 ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式断点 ========== */
@media (max-width: 1024px) {
    h1 { font-size: 2.4rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.35rem; }
    .section { padding: 70px 0; }
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.7rem; }
    h3 { font-size: 1.2rem; }
    .section { padding: 50px 0; }
    .container { padding: 0 16px; }
}

@media (max-width: 480px) {
    h1 { font-size: 1.6rem; }
    h2 { font-size: 1.4rem; }
    .btn { padding: 10px 20px; font-size: 0.9rem; }
}