/* Common CSS for all pages */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066ff;
    --primary-dark: #0052cc;
    --secondary-color: #00a3ff;
    --accent-color: #00d4ff;
    --light-bg: #f5f8fa;
    --card-bg: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #666680;
    --success-color: #00c853;
    --danger-color: #ff3d00;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--light-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 80%, rgba(0, 102, 255, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 163, 255, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(0, 212, 255, 0.04) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: 1rem 2rem;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #0066ff, #00a3ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s;
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
    color: #0066ff;
}

.nav-btn {
    background: linear-gradient(135deg, #0066ff, #00a3ff);
    padding: 0.7rem 1.8rem;
    border-radius: 50px;
    text-decoration: none;
    color: white !important;
    transition: all 0.3s;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.35);
    color: white !important;
}

/* Footer */
.footer {
    padding: 5rem 2rem 2rem;
    background: #f5f8fa;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    margin-top: 5rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #1f2937;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 1rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s;
    font-size: 0.95rem;
}

.footer-section ul li a:hover {
    color: #0066ff;
}

.footer-bottom {
    text-align: center;
    padding-top: 3rem;
    margin-top: 4rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .footer-container {
        grid-template-columns: repeat(2, 1fr);
    }
}