/**
 * 9A Paper — Public Portal Stylesheet (public.css)
 * Past paper catalog, subject taxonomy, coverage matrix, search banner, and public layout styles.
 */

:root {
    --pub-bg-base: #f8fafc;        /* slate-50 */
    --pub-bg-surface: #ffffff;
    --pub-border: #f1f5f9;         /* slate-100 */
    --pub-border-subtle: #e2e8f0;  /* slate-200 */
    --pub-text-main: #0f172a;      /* slate-900 */
    --pub-text-muted: #64748b;     /* slate-500 */
    --pub-red-primary: #dc2626;    /* red-600 */
    --pub-red-dark: #b91c1c;      /* red-700 */
    --pub-red-50: #fef2f2;
    --pub-red-100: #fee2e2;
}

body.public-portal {
    background-color: var(--pub-bg-base);
    color: var(--pub-text-main);
    font-family: var(--font-base, 'Instrument Sans', 'Noto Sans Sinhala', 'Noto Sans Tamil', 'Iskoola Pota', 'Nirmala UI', system-ui, sans-serif);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Public Header & Nav */
.pub-header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #fee2e2;
}

.pub-nav-link {
    font-size: 0.75rem;
    font-weight: 600;
    color: #475569;
    padding: 0.375rem 0.625rem;
    border-radius: 0.5rem;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.pub-nav-link:hover,
.pub-nav-link.is-active {
    color: var(--pub-red-primary);
    background-color: var(--pub-red-50);
}

/* Hero Search Banner */
.pub-hero-banner {
    background: linear-gradient(135deg, #ffffff 0%, #fff1f2 100%);
    border-bottom: 1px solid #fee2e2;
    padding: 3.5rem 1rem;
    text-align: center;
}

.pub-search-bar {
    max-width: 42rem;
    margin: 0 auto;
    position: relative;
    border-radius: 1rem;
    box-shadow: 0 10px 25px -5px rgba(220, 38, 38, 0.08);
}

.pub-search-input {
    width: 100%;
    padding: 1rem 1.25rem 1rem 3rem;
    background-color: #ffffff;
    border: 2px solid #fecdd3;
    border-radius: 1rem;
    font-size: 0.875rem;
    color: #0f172a;
    transition: all 0.2s ease;
}

.pub-search-input:focus {
    outline: none;
    border-color: var(--pub-red-primary);
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.12);
}

/* Paper Archive Cards */
.pub-paper-card {
    background: #ffffff;
    border: 1px solid var(--pub-border-subtle);
    border-radius: 1rem;
    padding: 1.25rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.pub-paper-card:hover {
    transform: translateY(-2px);
    border-color: #fca5a5;
    box-shadow: 0 8px 16px -2px rgba(220, 38, 38, 0.08);
}

/* Download Action Buttons */
.pub-btn-download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    background-color: var(--pub-red-primary);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 0.625rem;
    box-shadow: 0 2px 4px rgba(220, 38, 38, 0.2);
    transition: all 0.15s ease;
}

.pub-btn-download:hover {
    background-color: var(--pub-red-dark);
    transform: translateY(-1px);
}

.pub-btn-scheme {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    background-color: #f1f5f9;
    color: #334155;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 0.625rem;
    border: 1px solid #cbd5e1;
    transition: all 0.15s ease;
}

.pub-btn-scheme:hover {
    background-color: #e2e8f0;
    color: #0f172a;
}

/* Subject Grid Cards */
.pub-subject-card {
    background: #ffffff;
    border: 1px solid var(--pub-border-subtle);
    border-radius: 1rem;
    padding: 1.25rem;
    transition: all 0.2s ease;
    text-align: center;
}

.pub-subject-card:hover {
    transform: translateY(-3px);
    border-color: #ef4444;
    box-shadow: 0 10px 20px -3px rgba(220, 38, 38, 0.08);
}

/* Coverage Matrix */
.coverage-matrix-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
}

.coverage-matrix-table th {
    background-color: #f8fafc;
    border-bottom: 2px solid #e2e8f0;
    padding: 0.75rem 1rem;
    color: #475569;
    font-weight: 700;
}

.coverage-matrix-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #f1f5f9;
}

.coverage-matrix-table tr:hover td {
    background-color: #fef2f2;
}

/* Telegram Callout Box */
.telegram-callout {
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    border-radius: 1.25rem;
    padding: 1.75rem;
    color: #ffffff;
    box-shadow: 0 10px 20px -4px rgba(2, 132, 199, 0.25);
}