/* AI Shorts Course Styles */

:root {
    --ai-primary: #6366f1;
    /* Indigo */
    --ai-secondary: #ec4899;
    /* Pink */
    --ai-dark: #1e1b4b;
    --ai-light: #eef2ff;
    --ai-gradient: linear-gradient(135deg, #6366f1, #ec4899);
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: #f8fafc;
    color: #334155;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.course-header {
    text-align: center;
    padding: 60px 20px;
    background: var(--ai-dark);
    color: white;
    border-radius: 20px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.course-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--ai-gradient);
    opacity: 0.1;
}

.course-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 800;
}

.course-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Curriculum Grid */
.curriculum-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.day-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    border: 1px solid #e2e8f0;
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.day-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    border-color: var(--ai-primary);
}

.day-badge {
    display: inline-block;
    background: var(--ai-light);
    color: var(--ai-primary);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 15px;
    align-self: flex-start;
}

.day-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: #1e293b;
}

.day-card p {
    font-size: 0.9rem;
    color: #64748b;
    margin-bottom: 20px;
    flex-grow: 1;
}

.status-icon {
    align-self: flex-end;
    color: #cbd5e1;
}

.day-card:hover .status-icon {
    color: var(--ai-primary);
}

/* Back Nav */
.back-nav {
    margin-bottom: 20px;
}

.back-nav a {
    color: #64748b;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9rem;
}

.back-nav a:hover {
    color: var(--ai-primary);
}