/* ===== 全局重置 & 变量 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0b0d15;
    --bg-secondary: #11141f;
    --bg-card: #171b2a;
    --bg-card-hover: #1f2438;
    --border-color: #2a2f45;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.85);
    --text-muted: rgba(255, 255, 255, 0.6);
    --accent-blue: #4b7cf7;
    --accent-cyan: #38d9f2;
    --accent-purple: #a78bfa;
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: rgba(255, 255, 255, 0.7);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent-blue);
    border-radius: 10px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(16px) saturate(1.2);
    background: rgba(11, 13, 21, 0.75);
    border-bottom: 1px solid rgba(42, 47, 69, 0.5);
    padding: 14px 0;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.3rem;
    letter-spacing: -0.5px;
    color: #fff;
}
.nav-brand i {
    color: #ffffff;
    font-size: 1.6rem;
    filter: drop-shadow(0 0 8px rgba(56, 217, 242, 0.3));
}
.nav-brand span {
    color: #ffffff;
    -webkit-text-fill-color: #ffffff;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    font-weight: 500;
    font-size: 0.95rem;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-secondary);
    transition: var(--transition);
    padding: 6px 16px;
    border-radius: 8px;
    background: transparent;
    border: 1px solid var(--border-color);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
}
.nav-links a::after {
    display: none;
}
.nav-links a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}
.nav-links a:active {
    transform: scale(0.95);
}

.nav-cta {
    color: #fff !important;
    padding: 6px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    background: rgba(75, 124, 247, 0.8);
    border: 1px solid var(--border-color);
    cursor: pointer;
    box-shadow: none;
}
.nav-cta:hover {
    background: rgba(75, 124, 247, 0.95);
    transform: translateY(-1px);
    color: #fff !important;
}
.nav-cta:active {
    transform: scale(0.95);
}

.nav-links a.active {
    color: #fff;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.6rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: var(--transition);
}
.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.06);
}
.nav-toggle:active {
    transform: scale(0.92);
}

/* ===== Hero 主视觉 ===== */
.hero {
    padding: 160px 0 120px;
    position: relative;
    overflow: hidden;
}
/* .hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(75, 124, 247, 0.12), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(167, 139, 250, 0.08), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
} */
.hero .container {
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 800px;
}
.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    color: var(--text-primary);
}
.hero-content h1 .highlight {
    color: var(--text-primary);
}
.hero-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.hero-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 12px;
}

/* ===== 卡片样式 ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
    text-align: left;
}
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 20px;
    transition: var(--transition);
    cursor: pointer;
}
.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(75, 124, 247, 0.25);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}
.card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}
.card .meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}
.card .meta i {
    margin-right: 4px;
}

/* ===== 通用按钮（与导航栏风格一致） ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 6px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    cursor: pointer;
    color: #fff;
    background: transparent;
    box-shadow: none;
}
.btn-primary {
    background: rgba(75, 124, 247, 0.8);
    color: #fff !important;
}
.btn-primary:hover {
    background: rgba(75, 124, 247, 0.95);
    transform: translateY(-1px);
    color: #fff !important;
}
.btn-primary:active {
    transform: scale(0.95);
}
.btn-secondary {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
}
.btn-secondary:hover {
    border-color: var(--accent-blue);
    background: rgba(75, 124, 247, 0.08);
    color: #fff;
    transform: translateY(-1px);
}
.btn-secondary:active {
    transform: scale(0.95);
}
.btn-danger {
    background: rgba(220, 53, 69, 0.8);
    color: #fff !important;
}
.btn-danger:hover {
    background: rgba(220, 53, 69, 0.95);
    transform: translateY(-1px);
    color: #fff !important;
}
.btn-danger:active {
    transform: scale(0.95);
}
.btn-success {
    background: rgba(81, 207, 102, 0.8);
    color: #fff !important;
}
.btn-success:hover {
    background: rgba(81, 207, 102, 0.95);
    transform: translateY(-1px);
    color: #fff !important;
}
.btn-success:active {
    transform: scale(0.95);
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
    font-family: var(--font);
}
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(75, 124, 247, 0.15);
}

/* ===== 错误页面 ===== */
.error-page {
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
}
.error-page i {
    font-size: 4rem;
    color: var(--text-muted);
    opacity: 0.3;
    margin-bottom: 16px;
}
.error-page h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.error-page p {
    font-size: 1.2rem;
}

/* ===== 空状态 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-state i {
    font-size: 4rem;
    color: var(--text-muted);
    opacity: 0.3;
    margin-bottom: 16px;
}
.empty-state h3 {
    font-size: 1.4rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        padding: 16px 0;
        gap: 8px;
        background: var(--bg-secondary);
        border-radius: var(--radius);
        border: 1px solid var(--border-color);
        margin-top: 8px;
    }
    .nav-links.open {
        display: flex;
    }
    .nav-toggle {
        display: block;
    }
    .hero-content h1 {
        font-size: 2.4rem;
    }
    .hero-content h2 {
        font-size: 2rem;
    }
    .hero {
        padding: 120px 0 80px;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
    .nav-links a {
        width: 100%;
        text-align: center;
        padding: 10px 16px;
    }
    .nav-cta {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }
    .hero-content h2 {
        font-size: 1.6rem;
    }
    .hero-content p {
        font-size: 1rem;
    }
}