/* Design tokens */
:root {
    --color-primary: #1a3a5c;
    --color-primary-dark: #122740;
    --color-accent: #e05c1a;
    --color-accent-hover: #c24d12;
    --color-text: #1a1a2e;
    --color-text-muted: #5a5a7a;
    --color-bg: #f8f8fc;
    --color-bg-card: #ffffff;
    --color-border: #dde1ef;
    --color-hero-bg: #1a3a5c;
    --color-hero-text: #ffffff;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 6px 20px rgba(0, 0, 0, 0.14);
    --transition-fast: 150ms ease;
}

/* Reset & base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    display: block;
}

/* ─── Header / Nav ─── */
.site-header {
    background-color: var(--color-primary);
    color: var(--color-hero-text);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 6px rgba(0,0,0,0.25);
}

.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.02em;
    text-decoration: none;
}

.nav-logo:hover {
    text-decoration: none;
    color: rgba(255,255,255,0.85);
}

.nav-links {
    display: flex;
    gap: var(--space-md);
    list-style: none;
}

.nav-links a {
    color: rgba(255,255,255,0.88);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: #ffffff;
    text-decoration: none;
}

/* ─── Main content ─── */
main {
    flex: 1;
}

/* ─── Footer ─── */
.site-footer {
    background-color: var(--color-primary-dark);
    color: rgba(255,255,255,0.65);
    text-align: center;
    padding: var(--space-md) var(--space-sm);
    font-size: 0.875rem;
    margin-top: auto;
}

/* ─── Container ─── */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* ─── Buttons ─── */
.btn {
    display: inline-block;
    padding: 0.6rem 1.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    border: none;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    color: #ffffff;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-sm {
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
}

.btn:disabled,
.btn[disabled] {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
}

/* ─── Hero section ─── */
.hero {
    background-color: var(--color-hero-bg);
    color: var(--color-hero-text);
    padding: var(--space-xl) var(--space-sm);
    text-align: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: var(--space-sm);
}

.hero-tagline {
    font-size: clamp(1rem, 2.5vw, 1.35rem);
    color: rgba(255,255,255,0.8);
    margin-bottom: var(--space-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ─── Section titles ─── */
.section {
    padding: var(--space-xl) var(--space-sm);
}

.section-title {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.section-title-center {
    text-align: center;
}

.section-intro {
    max-width: 680px;
    margin: 0 auto var(--space-lg);
    color: var(--color-text-muted);
    text-align: center;
    line-height: 1.7;
}

/* ─── Card grid ─── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-md);
}

/* ─── Card ─── */
.card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.card-image-placeholder {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
    font-size: 2.5rem;
}

.card-body {
    padding: var(--space-md);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
}

.card-text {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    flex: 1;
}

.card-footer {
    padding: var(--space-xs) var(--space-md) var(--space-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

/* ─── Term badges/tags ─── */
.term-tag {
    display: inline-block;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.25rem 0.6rem;
    font-size: 0.8rem;
    color: var(--color-primary);
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.term-tag:hover {
    background-color: var(--color-primary);
    color: #ffffff;
    text-decoration: none;
}

/* ─── Page header ─── */
.page-header {
    background-color: var(--color-primary);
    color: #ffffff;
    padding: var(--space-lg) var(--space-sm);
}

.page-header-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.page-header h1 {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
}

.page-header .subtitle {
    color: rgba(255,255,255,0.75);
    margin-top: var(--space-xs);
    font-size: 1rem;
}

/* ─── Breadcrumb ─── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    padding: var(--space-sm) 0;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-primary);
}

.breadcrumb-sep {
    color: var(--color-border);
}

/* ─── Term detail ─── */
.term-header {
    background-color: var(--color-primary);
    color: #ffffff;
    padding: var(--space-lg) var(--space-sm);
}

.term-header-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.term-header h1 {
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 800;
    margin-bottom: var(--space-xs);
}

.term-meta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.8);
    margin-top: var(--space-sm);
}

.term-meta-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.term-details {
    background-color: rgba(255,255,255,0.08);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    margin-top: var(--space-sm);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ─── Program schedule ─── */
.schedule-section {
    padding: var(--space-lg) 0;
}

.day-block {
    margin-bottom: var(--space-lg);
}

.day-heading {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.program-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.program-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    display: grid;
    grid-template-columns: 110px 1fr auto;
    gap: var(--space-sm);
    align-items: start;
    box-shadow: var(--shadow-card);
}

.program-time {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-accent);
    white-space: nowrap;
    padding-top: 0.1rem;
}

.program-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.program-title {
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-primary);
}

.program-meta {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.program-action {
    display: flex;
    align-items: center;
}

.capacity-badge {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    display: block;
    margin-top: 0.2rem;
    text-align: right;
}

/* ─── About section ─── */
.about-section {
    background-color: #ffffff;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.about-text h2 {
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.about-text p {
    color: var(--color-text-muted);
    line-height: 1.75;
    margin-bottom: var(--space-sm);
}

.about-visual {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: var(--radius-lg);
    height: 260px;
}

/* ─── Preview section heading ─── */
.seasons-preview {
    padding: var(--space-xl) var(--space-sm);
}

/* ─── Empty state ─── */
.empty-state {
    text-align: center;
    padding: var(--space-xl);
    color: var(--color-text-muted);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-visual {
        display: none;
    }

    .program-card {
        grid-template-columns: 1fr;
    }

    .program-action {
        justify-content: flex-start;
    }

    .capacity-badge {
        text-align: left;
    }

    .term-meta {
        flex-direction: column;
        gap: var(--space-xs);
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: var(--space-sm);
    }
}