/**
 * assets/css/app.css — Design system + public styles. Module: M0 Foundation.
 * Mobile-first, pastel/light theme, Apple-style cards. Extended per module.
 */

/* ---------- Tokens ---------- */
:root {
    --bg: #f5f6fa;
    --surface: #ffffff;
    --text: #1d1d1f;
    --text-muted: #6e6e73;
    --accent: #4f7cff;
    --accent-dark: #3a63e0;
    --accent-soft: #eaf0ff;
    --success: #2f9e6e;
    --success-soft: #e7f6ef;
    --danger: #d64545;
    --danger-soft: #fdecec;
    --warning: #b8860b;
    --warning-soft: #fdf6e3;
    --border: #e5e5ea;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.05);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
}

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

html {
    -webkit-text-size-adjust: 100%;
}

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

img,
canvas,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--accent-dark);
}

h1, h2, h3, h4 {
    line-height: 1.25;
    font-weight: 700;
}

/* ---------- Layout ---------- */
.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 16px;
}

.site-main {
    flex: 1;
    padding-bottom: 48px;
}

/* ---------- Header / Nav ---------- */
.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 60px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
    font-size: 1.15rem;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--accent);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.nav-toggle {
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: 0;
    padding: 8px;
    cursor: pointer;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
}

.site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding: 8px 0 16px;
}

.site-nav.open {
    display: flex;
}

.nav-link {
    padding: 10px 4px;
    color: var(--text);
    font-weight: 500;
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    color: var(--accent);
}

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        display: flex;
        flex-direction: row;
        gap: 8px;
        width: auto;
        padding: 0;
    }

    .nav-link {
        padding: 8px 14px;
    }
}

/* ---------- Hero ---------- */
.hero {
    background: linear-gradient(180deg, var(--accent-soft) 0%, var(--bg) 100%);
    padding: 56px 0 40px;
    text-align: center;
    margin-bottom: 32px;
}

.hero h1 {
    font-size: 1.75rem;
    margin-bottom: 12px;
}

.hero-sub {
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto;
    font-size: 1.05rem;
}

@media (min-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
}

/* ---------- Cards ---------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
}

.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

@media (min-width: 600px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .card-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.card-icon {
    font-size: 1.75rem;
    margin-bottom: 12px;
}

.card-title {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card-wide {
    margin-bottom: 24px;
}

.card-center {
    text-align: center;
    max-width: 480px;
    margin: 48px auto;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 999px;
    border: 0;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease;
    text-align: center;
}

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

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

/* ---------- Forms (base — extended in later modules) ---------- */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 1rem;
    background: var(--surface);
    color: var(--text);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-error {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 4px;
}

/* ---------- Alerts / flash ---------- */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin: 16px 0;
    font-size: 0.95rem;
}

.alert-success {
    background: var(--success-soft);
    color: var(--success);
}

.alert-error {
    background: var(--danger-soft);
    color: var(--danger);
}

.alert-warning {
    background: var(--warning-soft);
    color: var(--warning);
}

/* ---------- Error pages ---------- */
.error-page .error-code {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
}

.error-page h1 {
    margin-bottom: 8px;
}

.error-page p {
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* ---------- Sections / typography ---------- */
.page-section {
    padding-top: 32px;
}

.section-title {
    font-size: 1.5rem;
    margin: 24px 0 16px;
}

.muted {
    color: var(--text-muted);
}

.page-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.content-page .card h2 {
    font-size: 1.15rem;
    margin: 20px 0 8px;
}

.content-page .card p {
    margin-bottom: 10px;
    color: var(--text);
}

/* ---------- Exam cards ---------- */
.exam-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

@media (min-width: 700px) {
    .exam-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.exam-card {
    display: block;
    color: var(--text);
    transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.exam-card:hover {
    transform: translateY(-2px);
    color: var(--text);
}

.exam-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 8px;
}

.exam-card-head h3, .exam-card-head h2 {
    font-size: 1.1rem;
}

.exam-meta {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin: 10px 0 14px;
}

.card-grid-2 {
    grid-template-columns: 1fr;
}

@media (min-width: 700px) {
    .card-grid-2 {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

.entry-card {
    display: block;
    color: var(--text);
    text-align: center;
}

.entry-card .btn {
    margin-top: 10px;
}

/* ---------- Badges & pills ---------- */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.4px;
    text-transform: uppercase;
}

.badge-live, .badge-success { background: var(--success-soft); color: var(--success); }
.badge-closed { background: var(--border); color: var(--text-muted); }
.badge-draft { background: var(--warning-soft); color: var(--warning); }
.badge-conf-high { background: var(--success-soft); color: var(--success); }
.badge-conf-medium { background: var(--warning-soft); color: var(--warning); }
.badge-conf-low { background: var(--danger-soft); color: var(--danger); }

.pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0;
}

.pill-row-center { justify-content: center; }

.pill {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 5px 12px;
    font-size: 0.85rem;
}

.pill-success { background: var(--success-soft); color: var(--success); border-color: transparent; }
.pill-danger { background: var(--danger-soft); color: var(--danger); border-color: transparent; }

/* ---------- Buttons (extra) ---------- */
.btn-small { padding: 6px 14px; font-size: 0.85rem; }
.btn-lg { padding: 14px 32px; font-size: 1.1rem; }
.btn-block { display: block; width: 100%; }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-danger { background: var(--danger-soft); color: var(--danger); }
.btn:not(.btn-primary):not(.btn-ghost):not(.btn-danger) { background: var(--accent-soft); color: var(--accent-dark); }

/* ---------- Forms (extra) ---------- */
.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0 16px;
}

@media (min-width: 700px) {
    .form-row { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
}

.form-card { max-width: 560px; }
.form-card-wide { max-width: 100%; }
.form-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.inline-form { display: inline; }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.check-label { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 14px; font-size: 0.95rem; }
.submit-card { text-align: center; }
.share-input { max-width: 420px; display: inline-block; font-size: 0.85rem; margin-left: 6px; }
.share-line { margin-top: 14px; font-size: 0.9rem; color: var(--text-muted); }

/* ---------- Stat cards ---------- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin: 16px 0;
}

@media (min-width: 768px) {
    .stat-grid { grid-template-columns: repeat(4, 1fr); }
}

.stat-card { text-align: center; padding: 18px 12px; }
.stat-value { font-size: 1.6rem; font-weight: 800; color: var(--accent); }
.stat-label { color: var(--text-muted); font-size: 0.85rem; }

/* ---------- Tables ---------- */
.table-card { padding: 18px; }
.table-wrap { overflow-x: auto; }

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.table th, .table td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.table th { color: var(--text-muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.4px; }
.empty-row { text-align: center; color: var(--text-muted); padding: 24px !important; }
.row-actions { white-space: nowrap; display: flex; gap: 6px; align-items: center; }

/* ---------- Result page ---------- */
.result-hero { text-align: center; margin-bottom: 16px; }
.result-marks { font-size: 3rem; font-weight: 800; color: var(--accent); line-height: 1.1; }
.result-max { font-size: 1.3rem; color: var(--text-muted); font-weight: 600; }

.two-col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin: 16px 0;
}

@media (min-width: 850px) {
    .two-col { grid-template-columns: 1fr 1fr; }
    .two-col-wide { grid-template-columns: 3fr 2fr; }
}

/* ---------- Answer grid (manual entry + OMR verification) ---------- */
.answer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 6px;
    max-height: 560px;
    overflow-y: auto;
    padding: 4px;
}

@media (min-width: 700px) {
    .answer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1000px) {
    .answer-grid { grid-template-columns: repeat(3, 1fr); }
}

.ag-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    background: var(--bg);
}

.ag-row.ag-flagged {
    background: var(--warning-soft);
    box-shadow: inset 0 0 0 1px var(--warning);
}

.ag-row.ag-flagged::after { content: '⚠'; margin-left: auto; }

.ag-qno {
    min-width: 34px;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.ag-opt {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: 1.5px solid var(--border);
    background: var(--surface);
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text);
}

.ag-opt.selected {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.ag-clear {
    width: 26px;
    height: 26px;
    border: 0;
    background: transparent;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
}

/* ---------- Question analysis grid ---------- */
.qa-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(58px, 1fr));
    gap: 6px;
}

.qa-cell {
    border-radius: var(--radius-sm);
    padding: 6px 4px;
    text-align: center;
    font-size: 0.75rem;
    cursor: default;
}

.qa-no { display: block; font-weight: 700; }
.qa-detail { color: inherit; opacity: 0.85; }
.qa-correct { background: var(--success-soft); color: var(--success); }
.qa-wrong { background: var(--danger-soft); color: var(--danger); }
.qa-skipped { background: var(--bg); color: var(--text-muted); border: 1px solid var(--border); }
.qa-cancelled { background: var(--warning-soft); color: var(--warning); }
.qa-legend { margin-top: 12px; }
.qa-chip { padding: 2px 10px; border-radius: 999px; font-size: 0.75rem; margin-right: 4px; }

/* ---------- OMR scanner ---------- */
.omr-stage { margin-top: 12px; }
.omr-canvas {
    width: 100%;
    max-width: 640px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #fff;
}

/* ---------- Ads ---------- */
.ad-slot { margin: 16px auto; text-align: center; max-width: 1080px; padding: 0 16px; }

/* ---------- Footer nav ---------- */
.footer-nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

/* ---------- Pagination ---------- */
.pagination { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 14px; }

.page-link {
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 0.9rem;
}

.page-link.current { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- Footer ---------- */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 24px 0;
}

.footer-wrap p {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
}