:root {
    --primary-color: #007AFF; /* iOS Blue */
    --bg-color: #F2F2F7;
    --card-bg: #FFFFFF;
    --text-main: #1C1C1E;
    --text-sub: #8E8E93;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    line-height: 1.5;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    background: var(--card-bg);
    padding: 40px 0;
    text-align: center;
    box-shadow: 0 1px 0 rgba(0,0,0,0.05);
    margin-bottom: 30px;
}
.site-header h1 { margin: 0 0 10px 0; font-size: 2rem; }
.site-header p { color: var(--text-sub); margin: 0; }

/* Grid Layout */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
    padding-bottom: 50px;
}

/* Card Design */
.card {
    background: var(--card-bg);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    transition: transform 0.2s ease;
    display: flex;
    flex-direction: column;
}
.card:hover { transform: translateY(-4px); }

.card-preview {
    height: 200px;
    background: #e5e5ea;
    display: flex;
    align-items: center;
    justify-content: center;
}
.card-content { padding: 20px; flex: 1; }
.tag { 
    background: #E5F1FF; color: var(--primary-color); 
    padding: 4px 8px; border-radius: 6px; 
    font-size: 0.8rem; font-weight: 600; 
}
.card h3 { margin: 10px 0; font-size: 1.25rem; }
.card p { color: var(--text-sub); font-size: 0.95rem; }

/* Buttons */
.card-actions {
    padding: 20px;
    border-top: 1px solid #F2F2F7;
    display: flex;
    gap: 10px;
}
.btn {
    flex: 1;
    display: inline-block;
    padding: 12px;
    text-align: center;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}
.btn-primary { background: var(--primary-color); color: white; }
.btn-outline { background: #F2F2F7; color: var(--primary-color); }

/* Ads */
.ad-banner {
    background: #E5E5EA;
    height: 100px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    margin-bottom: 30px;
}
.site-footer { text-align: center; padding: 40px; color: var(--text-sub); font-size: 0.8rem; }