/* ============================================================
   TRILINGUA — Main Stylesheet
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Source+Sans+3:wght@300;400;500;600&display=swap');

:root {
    --bg: #0f0f1a;
    --surface: #1a1a2e;
    --surface-hover: #222240;
    --card: #16162b;
    --border: #2a2a45;
    --text: #e8e8f0;
    --text-dim: #8888a8;
    --accent: #e8d5b7;
    --accent-dim: #c4a882;
    --success: #4ade80;
    --warning: #fbbf24;
    --danger: #f87171;
    --info: #60a5fa;
    --font-display: 'Playfair Display', serif;
    --font-body: 'Source Sans 3', sans-serif;
    --radius: 10px;
    --radius-sm: 7px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
}

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

/* ─── Login Page ──────────────────────────────────────────── */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 40px;
    width: 420px;
    max-width: 100%;
    text-align: center;
}

.login-logo {
    font-family: var(--font-display);
    font-size: 38px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
}

.login-tagline {
    font-size: 13px;
    color: var(--text-dim);
    margin-bottom: 32px;
}

.login-toggle {
    display: flex;
    background: var(--bg);
    border-radius: 8px;
    padding: 3px;
    margin-bottom: 28px;
}

.login-toggle a {
    flex: 1;
    padding: 9px;
    text-align: center;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-dim);
    transition: all 0.2s;
}

.login-toggle a.active,
.login-toggle a:hover {
    background: var(--surface);
    color: var(--accent);
}

/* ─── Forms ───────────────────────────────────────────────── */
.form-group {
    margin-bottom: 18px;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 11px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    font-weight: 500;
}

.form-input {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 11px 14px;
    color: var(--text);
    font-size: 14px;
    font-family: var(--font-body);
    transition: border-color 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
}

.form-input::placeholder {
    color: var(--text-dim);
    opacity: 0.6;
}

.form-input.mono {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 13px;
    letter-spacing: 0.8px;
}

.form-input.lg {
    padding: 13px 14px;
    font-size: 15px;
}

/* ─── Buttons ─────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn:hover {
    background: var(--surface-hover);
    color: var(--text);
}

.btn-primary {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
    font-weight: 600;
}

.btn-primary:hover {
    background: var(--accent-dim);
    color: var(--bg);
}

.btn-block {
    width: 100%;
    padding: 12px;
    font-size: 15px;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-danger {
    color: var(--danger);
    border-color: rgba(248, 113, 113, 0.3);
}

.btn-danger:hover {
    background: rgba(248, 113, 113, 0.1);
}

/* ─── Alerts ──────────────────────────────────────────────── */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    margin-bottom: 20px;
    border: 1px solid;
}

.alert-error {
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.3);
    color: var(--danger);
}

.alert-success {
    background: rgba(74, 222, 128, 0.1);
    border-color: rgba(74, 222, 128, 0.3);
    color: var(--success);
}

.alert-warning {
    background: rgba(251, 191, 36, 0.1);
    border-color: rgba(251, 191, 36, 0.3);
    color: var(--warning);
}

/* ─── Expired Page ────────────────────────────────────────── */
.expired-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    padding: 20px;
}

.expired-icon {
    font-size: 52px;
    margin-bottom: 16px;
}

.expired-title {
    font-family: var(--font-display);
    font-size: 26px;
    color: var(--text);
    margin-bottom: 10px;
}

.expired-text {
    color: var(--text-dim);
    font-size: 14px;
    line-height: 1.7;
    max-width: 380px;
    margin: 0 auto;
}

.expired-email {
    color: var(--accent);
    font-weight: 600;
}

/* ─── App Layout (sidebar + main) ─────────────────────────── */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 256px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 50;
}

.sidebar-header {
    padding: 22px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
    font-family: var(--font-display);
    font-size: 19px;
    color: var(--accent);
    font-weight: 600;
}

.sidebar-badge {
    font-size: 10px;
    color: var(--text-dim);
    background: var(--bg);
    padding: 2px 8px;
    border-radius: 4px;
    margin-left: auto;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar-nav {
    flex: 1;
    padding: 14px 10px;
    display: flex;
    flex-direction: column;
    gap: 3px;
    overflow-y: auto;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 9px 12px;
    border-radius: 8px;
    color: var(--text-dim);
    font-size: 13.5px;
    font-weight: 500;
    transition: all 0.2s;
    text-decoration: none;
}

.sidebar-item:hover {
    background: var(--surface-hover);
    color: var(--text);
}

.sidebar-item.active {
    background: var(--bg);
    color: var(--accent);
}

.sidebar-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 14px 12px;
    border-top: 1px solid var(--border);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-dim));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    color: var(--bg);
    flex-shrink: 0;
}

.sidebar-user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-role {
    font-size: 11px;
    color: var(--text-dim);
}

.sidebar-logout {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    padding: 4px;
    display: flex;
    transition: color 0.2s;
}

.sidebar-logout:hover {
    color: var(--danger);
}

/* Main content area */
.main-content {
    flex: 1;
    margin-left: 256px;
    padding: 32px;
    min-height: 100vh;
    overflow-y: auto;
}

.page-title {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 4px;
}

.page-subtitle {
    font-size: 13.5px;
    color: var(--text-dim);
    margin-bottom: 28px;
}

/* ─── Cards ───────────────────────────────────────────────── */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 22px;
    margin-bottom: 16px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.card-title {
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 600;
}

/* ─── Stats Grid ──────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
}

.stat-label {
    font-size: 11px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 6px;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 30px;
    font-weight: 700;
    color: var(--accent);
}

.stat-sub {
    font-size: 11.5px;
    color: var(--text-dim);
    margin-top: 3px;
}

/* ─── Utility ─────────────────────────────────────────────── */
.text-dim { color: var(--text-dim); }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 0.3s ease; }

/* ─── Mobile / Responsive ─────────────────────────────────── */

/* Hamburger button — hidden on desktop */
.hamburger {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text);
    flex-shrink: 0;
}

/* Overlay behind open sidebar on mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 49;
}
.sidebar-overlay.open { display: block; }

@media (max-width: 768px) {

    /* Show hamburger */
    .hamburger { display: flex; }

    /* Sidebar slides in from left */
    .sidebar {
        transform: translateX(-100%);
        transition: transform .25s ease;
        z-index: 100;
    }
    .sidebar.open {
        transform: translateX(0);
    }

    /* Main content takes full width, add top padding for hamburger */
    .main-content {
        margin-left: 0;
        padding: 60px 16px 24px;
    }

    /* Page titles */
    .page-title { font-size: 20px; }
    .page-subtitle { font-size: 12px; margin-bottom: 18px; }

    /* Cards */
    .card { padding: 14px; }

    /* Stats grid — single column */
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    /* Form rows — stack on mobile */
    .form-row,
    .fr {
        grid-template-columns: 1fr !important;
    }

    /* Buttons — full width on mobile where appropriate */
    .btn-block-mobile {
        width: 100%;
        justify-content: center;
    }

    /* Tables — horizontal scroll */
    .table-wrap {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    table {
        min-width: 500px;
    }

    /* Tab navigation — scrollable */
    .ct {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        flex-wrap: nowrap !important;
        padding-bottom: 4px;
    }
    .ct::-webkit-scrollbar { display: none; }

    /* Flashcard */
    .fc-card-wrap { max-width: 100%; }
    .fc-rate-buttons { gap: 6px; }
    .fc-rate-btn { font-size: 12px; padding: 10px 6px; }

    /* Vocab grid */
    .vc-grid {
        grid-template-columns: 1fr 1fr !important;
        gap: 10px;
    }

    /* Item rows with buttons */
    .item-row {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 10px;
    }
    .item-row > div:last-child {
        width: 100%;
        flex-wrap: wrap;
    }

    /* Lang cards on dashboard */
    .lang-card { padding: 14px; }
    .vocab-row { gap: 12px; }
    .vocab-stats { gap: 12px; }
    .content-circles { gap: 12px; }

    /* Exercise test overlay */
    .fc-card-wrap { width: 100%; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .vc-grid { grid-template-columns: 1fr !important; }
    .fc-stats { gap: 6px; }
    .fc-stat { padding: 10px; }
    .fc-stat-num { font-size: 20px; }
}