/* ═══════════════════════════════════════════════════════
   Homepage — 首页专属样式 & 动画
   ═══════════════════════════════════════════════════════ */

/* ── Hero Section ── */
.hero {
    text-align: center;
    padding: 80px 20px 64px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-emoji {
    font-size: 72px;
    margin-bottom: 20px;
    display: inline-block;
    animation: heroFloat 3s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-8px) rotate(-3deg); }
    75% { transform: translateY(4px) rotate(3deg); }
}

.hero h1 {
    font-size: 44px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    line-height: 1.15;
    position: relative;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, var(--primary), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ── Feature Cards ── */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 0 auto 40px;
    max-width: 1000px;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.03), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-card .feature-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--primary);
    margin-bottom: 18px;
    transition: all var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ── Staggered animation for features ── */
.feature-card:nth-child(1) { animation: fadeInUp 0.5s 0.1s var(--transition) both; }
.feature-card:nth-child(2) { animation: fadeInUp 0.5s 0.2s var(--transition) both; }
.feature-card:nth-child(3) { animation: fadeInUp 0.5s 0.3s var(--transition) both; }

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero {
        padding: 48px 16px 40px;
    }
    .hero h1 {
        font-size: 30px;
    }
    .hero-emoji {
        font-size: 56px;
    }
    .hero p {
        font-size: 15px;
    }
    .features {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .feature-card {
        padding: 24px 20px;
    }
}