/* ==========================================================================
   agilefrench Design System — Original Canadian French Learning Platform
   ========================================================================== */

:root {
    --bg-navy: #0B1B35;
    --navy-mid: #13294B;
    --navy-soft: #1E3A63;
    --primary: #1D4ED8;
    --primary-dark: #1E3A8A;
    --primary-light: #DBEAFE;
    --primary-tint: #EFF6FF;
    --bg-canvas: #FAF9F6;
    --bg-surface: #FFFFFF;
    --bg-muted: #F1F5F9;
    --accent-maple: #C83E37;
    --accent-maple-soft: #FEE2E2;
    --success: #0F766E;
    --success-soft: #CCFBF1;
    --warning: #B45309;
    --warning-soft: #FEF3C7;
    --danger: #B91C1C;
    --danger-soft: #FEE2E2;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --border-strong: #CBD5E1;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 25px -8px rgba(11, 27, 53, 0.10);
    --shadow-lg: 0 20px 45px -15px rgba(11, 27, 53, 0.16);
    --font-sans: 'Plus Jakarta Sans', 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Source Serif 4', Georgia, Cambria, serif;
    --container-max: 1200px;
}

*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: var(--font-sans);
    background-color: var(--bg-canvas);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img, svg, video {
    max-width: 100%;
}

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

a:hover {
    text-decoration: underline;
}

:focus-visible {
    outline: 3px solid #2563EB;
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 8px;
    z-index: 9999;
    background: var(--bg-navy);
    color: #fff;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.skip-link:focus {
    left: 12px;
}

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.25rem;
}

.container-narrow {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

/* Typography */
h1, h2, h3, h4 {
    margin: 0 0 0.75rem;
    line-height: 1.2;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p {
    margin: 0 0 1rem;
    color: var(--text-secondary);
}

.text-muted { color: var(--text-muted); }
.text-small { font-size: 0.875rem; }
.text-xs { font-size: 0.78rem; }
.serif-passage { font-family: var(--font-serif); font-size: 1.08rem; line-height: 1.8; color: var(--text-primary); }

/* Buttons & Badges */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.72rem 1.35rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
    text-decoration: none !important;
    font-family: inherit;
    line-height: 1.2;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(29, 78, 216, 0.25);
}
.btn-primary:hover { background: var(--primary-dark); }

.btn-navy {
    background: var(--bg-navy);
    color: #fff;
}
.btn-navy:hover { background: var(--navy-mid); }

.btn-maple {
    background: var(--accent-maple);
    color: #fff;
}
.btn-maple:hover { background: #a7302a; }

.btn-outline {
    background: var(--bg-surface);
    color: var(--text-primary);
    border-color: var(--border-strong);
}
.btn-outline:hover { background: var(--bg-muted); border-color: var(--text-muted); }

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--bg-muted); color: var(--text-primary); }

.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-success:hover { background: #0d625b; }

.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover { background: #991b1b; }

.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.85rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 0.9rem 1.75rem; font-size: 1.05rem; }

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    background: var(--bg-muted);
    color: var(--text-secondary);
}

.badge-primary { background: var(--primary-light); color: var(--primary-dark); }
.badge-maple { background: var(--accent-maple-soft); color: #991B1B; }
.badge-success { background: var(--success-soft); color: #0F766E; }
.badge-warning { background: var(--warning-soft); color: #92400E; }
.badge-navy { background: var(--bg-navy); color: #fff; }

/* Header & Navigation */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 72px;
}

.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none !important;
    color: var(--bg-navy);
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}

.brand-link img {
    width: 36px;
    height: 36px;
}

.brand-tag {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent-maple);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    display: block;
    line-height: 1;
}

.nav-links {
    display: none;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.92rem;
    text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: var(--primary-tint);
}

.nav-actions {
    display: none;
    align-items: center;
    gap: 0.6rem;
}

.mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
}

.mobile-drawer {
    display: none;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    padding: 1rem 1.25rem 1.5rem;
}

.mobile-drawer.open {
    display: block;
}

.mobile-drawer a {
    display: block;
    padding: 0.65rem 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.mobile-drawer a:hover {
    background: var(--bg-muted);
    text-decoration: none;
}

.mobile-drawer-actions {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

@media (min-width: 1024px) {
    .nav-links { display: flex; }
    .nav-actions { display: flex; }
    .mobile-toggle, .mobile-drawer { display: none !important; }
}

/* Cards & Grids */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.card-hover {
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

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

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

@media (min-width: 640px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Sections & Hero */
.section {
    padding: 4rem 0;
}

.section-muted {
    background: var(--bg-muted);
}

.section-navy {
    background: var(--bg-navy);
    color: #fff;
}
.section-navy h2, .section-navy h3, .section-navy p {
    color: #E2E8F0;
}
.section-navy h2 { color: #fff; }

.section-header {
    max-width: 720px;
    margin: 0 auto 2.5rem;
    text-align: center;
}

.eyebrow {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-maple);
    margin-bottom: 0.65rem;
}

.hero {
    background: linear-gradient(135deg, #0B1B35 0%, #152E56 60%, #1E3A8A 100%);
    color: #fff;
    padding: 4.5rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    gap: 2.5rem;
    align-items: center;
}

@media (min-width: 960px) {
    .hero-grid { grid-template-columns: 1.15fr 0.85fr; }
}

.hero h1 { color: #fff; margin-bottom: 1rem; }
.hero p.hero-sub { color: #CBD5E1; font-size: 1.12rem; max-width: 580px; margin-bottom: 1.75rem; }

.hero-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    margin-bottom: 1.75rem;
}

.hero-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    font-size: 0.88rem;
    color: #CBD5E1;
}

.hero-preview-card {
    background: rgba(255, 255, 255, 0.98);
    color: var(--text-primary);
    border-radius: var(--radius-xl);
    padding: 1.65rem;
    box-shadow: var(--shadow-lg);
}

.progress-track {
    width: 100%;
    height: 10px;
    background: var(--bg-muted);
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, #0EA5E9 100%);
    border-radius: 999px;
    transition: width 0.3s ease;
}

/* Alerts & Flashes */
.alert {
    padding: 0.9rem 1.1rem;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.75rem;
    font-size: 0.94rem;
}

.alert-success { background: var(--success-soft); color: #115E59; border-color: #99F6E4; }
.alert-error { background: var(--danger-soft); color: #991B1B; border-color: #FECACA; }
.alert-info { background: var(--primary-tint); color: var(--primary-dark); border-color: #BFDBFE; }
.alert-warning { background: var(--warning-soft); color: #92400E; border-color: #FDE68A; }

/* Forms */
.form-group {
    margin-bottom: 1.15rem;
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.95rem;
    background: var(--bg-surface);
    color: var(--text-primary);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
}

textarea.form-control {
    min-height: 110px;
    resize: vertical;
}

.form-row {
    display: grid;
    gap: 1rem;
}

@media (min-width: 640px) {
    .form-row-2 { grid-template-columns: 1fr 1fr; }
    .form-row-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Dashboard & Sidebar Layout */
.app-shell {
    display: grid;
    min-height: 100vh;
}

.app-sidebar {
    background: var(--bg-navy);
    color: #E2E8F0;
    padding: 1.25rem;
    display: none;
    flex-direction: column;
    justify-content: space-between;
}

.app-sidebar.open {
    display: flex;
    position: fixed;
    inset: 0 auto 0 0;
    width: 270px;
    z-index: 200;
    overflow-y: auto;
}

.app-topbar-mobile {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 1.25rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 90;
}

.app-main {
    padding: 1.5rem 1.25rem 3rem;
    min-width: 0;
}

.sidebar-nav {
    list-style: none;
    margin: 1.25rem 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.65rem 0.9rem;
    border-radius: var(--radius-sm);
    color: #CBD5E1;
    font-weight: 600;
    font-size: 0.92rem;
    text-decoration: none;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.sidebar-section-title {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #94A3B8;
    margin: 1rem 0 0.35rem 0.9rem;
    font-weight: 700;
}

@media (min-width: 1024px) {
    .app-shell {
        grid-template-columns: 264px 1fr;
    }
    .app-sidebar {
        display: flex;
        position: sticky;
        top: 0;
        height: 100vh;
        overflow-y: auto;
    }
    .app-topbar-mobile {
        display: none;
    }
    .app-main {
        padding: 2rem 2.5rem 4rem;
    }
}

/* Stat KPI Cards */
.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.2rem 1.35rem;
}

.stat-value {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--bg-navy);
    line-height: 1.1;
    margin: 0.35rem 0;
}

.stat-label {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* Tables */
.table-wrap {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

table.data-table th,
table.data-table td {
    padding: 0.8rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

table.data-table th {
    background: var(--bg-muted);
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

table.data-table tr:last-child td {
    border-bottom: none;
}

/* Lesson Distraction-Free Mode */
.lesson-header {
    background: var(--bg-navy);
    color: #fff;
    padding: 0.85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    position: sticky;
    top: 0;
    z-index: 95;
}

.lesson-header a { color: #CBD5E1; text-decoration: none; }
.lesson-header a:hover { color: #fff; }

.lesson-layout {
    display: grid;
    min-height: calc(100vh - 60px);
}

.lesson-curriculum {
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: 1.25rem;
    display: none;
}

.lesson-curriculum.open {
    display: block;
}

@media (min-width: 1024px) {
    .lesson-layout {
        grid-template-columns: 310px 1fr;
    }
    .lesson-curriculum {
        display: block;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        position: sticky;
        top: 60px;
    }
}

.lesson-item-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.55rem 0.7rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.lesson-item-link.active {
    background: var(--primary-tint);
    color: var(--primary-dark);
    font-weight: 700;
}

/* Quiz, Placement & Mock Exam Interactive Widgets */
.option-card {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 0.65rem;
    cursor: pointer;
    background: var(--bg-surface);
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.option-card:hover {
    border-color: var(--primary);
    background: var(--primary-tint);
}

.option-card input {
    margin-top: 0.2rem;
    accent-color: var(--primary);
}

.chip-bank, .chip-dropzone {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    min-height: 48px;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    border: 1.5px dashed var(--border-strong);
    background: var(--bg-muted);
    margin-bottom: 0.65rem;
}

.word-chip {
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    padding: 0.4rem 0.8rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
}

.word-chip:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Flashcards */
.flashcard-stage {
    perspective: 1000px;
    max-width: 560px;
    margin: 0 auto 1.5rem;
}

.flashcard {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2.5rem 2rem;
    min-height: 260px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: var(--shadow-md);
    cursor: pointer;
}

.flashcard-back {
    display: none;
}

.flashcard.flipped .flashcard-front {
    display: none;
}

.flashcard.flipped .flashcard-back {
    display: block;
}

/* Footer */
.site-footer {
    background: var(--bg-navy);
    color: #CBD5E1;
    padding: 3.5rem 0 2rem;
    margin-top: 4rem;
}

.site-footer h4 { color: #fff; margin-bottom: 0.9rem; font-size: 0.98rem; }
.site-footer a { color: #CBD5E1; font-size: 0.9rem; display: block; margin-bottom: 0.45rem; }
.site-footer a:hover { color: #fff; }

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.85rem;
    color: #94A3B8;
}

/* Certificate Printable */
.certificate-frame {
    background: #fff;
    border: 10px double var(--bg-navy);
    border-radius: var(--radius-lg);
    padding: 3rem 2.5rem;
    text-align: center;
    max-width: 820px;
    margin: 2rem auto;
    box-shadow: var(--shadow-lg);
}

@media print {
    .no-print, .site-header, .site-footer, .app-sidebar, .app-topbar-mobile {
        display: none !important;
    }
    body { background: #fff; }
    .certificate-frame { box-shadow: none; margin: 0; width: 100%; }
}

/* Helper Utilities */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }