:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(148, 163, 184, 0.1);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08), transparent 25%), 
        radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08), transparent 25%);
}

.main-container {
    width: 100%;
    max-width: 1200px;
    padding: 60px 20px;
    box-sizing: border-box;
    text-align: center;
}

.header {
    margin-bottom: 80px;
}

.title {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 0 0 20px 0;
    background: linear-gradient(135deg, #60a5fa 0%, #c084fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 20px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 40px 30px;
    text-align: left;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    height: 100%;
    box-sizing: border-box;
}

.card:hover {
    transform: translateY(-5px);
    background: rgba(30, 41, 59, 0.9);
    border-color: rgba(148, 163, 184, 0.3);
    box-shadow: 0 20px 40px -5px rgba(0, 0, 0, 0.3);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 24px;
    display: inline-block;
    padding: 16px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.05);
    width: fit-content;
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 12px 0;
    color: var(--text-primary);
}

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
    flex-grow: 1;
}

.card-arrow {
    margin-top: 24px;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.card:hover .card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* Specific Card Colors */
.card.dashboard .card-icon { color: var(--accent-blue); background: rgba(59, 130, 246, 0.1); }
.card.dashboard:hover .card-arrow { color: var(--accent-blue); }

.card.query .card-icon { color: var(--accent-emerald); background: rgba(16, 185, 129, 0.1); }
.card.query:hover .card-arrow { color: var(--accent-emerald); }

.card.douyin .card-icon { color: var(--accent-purple); background: rgba(139, 92, 246, 0.1); }
.card.douyin:hover .card-arrow { color: var(--accent-purple); }

.card.haibao .card-icon { color: var(--accent-cyan); background: rgba(6, 182, 212, 0.1); }
.card.haibao:hover .card-arrow { color: var(--accent-cyan); }

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

@media (max-width: 768px) {
    .title { font-size: 2.5rem; }
    .cards-grid { grid-template-columns: 1fr; }
}