/* 4000 Essential English Words — Spaced Repetition Platform */

:root {
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --emerald-400: #34d399;
    --emerald-500: #10b981;
    --emerald-600: #059669;
    --emerald-700: #047857;
    --amber-400: #fbbf24;
    --amber-500: #f59e0b;
    --amber-600: #d97706;
    --rose-400: #fb7185;
    --rose-500: #f43f5e;
    --rose-600: #e11d48;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--slate-100) 0%, var(--slate-200) 100%);
    color: var(--slate-800);
    min-height: 100vh;
    line-height: 1.6;
}

.app {
    max-width: 900px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: var(--slate-800);
    color: white;
    padding: 1.25rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-back {
    background: var(--slate-700);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    flex-shrink: 0;
}

.btn-back:hover {
    background: var(--slate-600);
}

.btn-back svg {
    width: 20px;
    height: 20px;
}

.btn-back.hidden {
    display: none;
}

.header-text h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header-text p {
    font-size: 0.85rem;
    color: var(--slate-400);
    margin-top: 0.15rem;
}

/* Main */
.main {
    flex: 1;
    padding: 1.5rem;
}

.view {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view.active {
    display: block;
}

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

.section-header {
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    color: var(--slate-800);
    font-weight: 700;
}

.section-header p {
    color: var(--slate-500);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* Test rejimi banner */
.test-mode-banner {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    border: 1px solid #fde68a;
    border-radius: 10px;
    padding: 0.55rem 0.85rem;
    margin-bottom: 1rem;
    text-align: center;
    box-shadow: 0 1px 3px rgb(245 158 11 / 0.12);
}

.test-mode-banner p {
    font-size: 0.78rem;
    color: var(--slate-600);
    line-height: 1.5;
    letter-spacing: 0.01em;
}

.test-mode-label {
    font-family: Georgia, 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    font-style: italic;
    font-weight: 700;
    font-size: 1.15em;
    letter-spacing: 0.06em;
    color: #b45309;
    text-transform: uppercase;
}

.test-mode-banner a {
    color: var(--amber-600);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid rgb(217 119 6 / 0.35);
}

.test-mode-banner a:hover {
    color: var(--amber-700);
    border-bottom-color: var(--amber-600);
}

.section-header-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.btn-reset {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: white;
    color: var(--rose-600);
    border: 1.5px solid var(--rose-200);
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
    flex-shrink: 0;
}

.btn-reset svg {
    width: 16px;
    height: 16px;
}

.btn-reset:hover {
    background: #fff1f2;
    border-color: var(--rose-400);
    color: var(--rose-600);
}

.btn-reset.trouble-pending {
    background: #fff1f2;
    border-color: var(--rose-500);
    color: var(--rose-600);
}

.btn-reset.trouble-pending:hover {
    background: #ffe4e6;
    border-color: var(--rose-500);
}

.btn-reset.trouble-passed {
    background: #ecfdf5;
    border-color: var(--emerald-500);
    color: var(--emerald-700);
}

.btn-reset.trouble-passed:hover {
    background: #d1fae5;
    border-color: var(--emerald-500);
}

.btn-reset .trouble-check {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 900;
}

.btn-reset-sm {
    margin-bottom: 0.75rem;
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
}

.book-card {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 2px solid transparent;
}

.book-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--emerald-400);
}

.book-card .book-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--emerald-500), var(--emerald-600));
    color: white;
    border-radius: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.book-card h3 {
    font-size: 1.1rem;
    color: var(--slate-800);
    margin-bottom: 0.35rem;
}

.book-card p {
    font-size: 0.85rem;
    color: var(--slate-500);
}

.book-card .book-progress {
    margin-top: 0.75rem;
    height: 6px;
    background: var(--slate-200);
    border-radius: 3px;
    overflow: hidden;
}

.book-card .book-progress-fill {
    height: 100%;
    background: var(--emerald-500);
    border-radius: 3px;
    transition: width 0.3s;
}

.book-pct {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--slate-500);
}

.book-card.inactive {
    cursor: not-allowed;
    opacity: 0.55;
    background: var(--slate-50);
    border-color: var(--slate-200);
}

.book-card.inactive:hover {
    transform: none;
    box-shadow: var(--shadow);
    border-color: var(--slate-200);
}

.book-card.inactive .book-number {
    background: linear-gradient(135deg, var(--slate-400), var(--slate-500));
}

.book-soon {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 0.35rem 0.75rem;
    background: var(--slate-200);
    color: var(--slate-600);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border-radius: 999px;
}

.book-soon-note {
    margin-top: 0.5rem !important;
    font-size: 0.8rem !important;
    color: var(--slate-400) !important;
    font-style: italic;
}

/* Units Grid */
.units-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
}

.unit-card {
    background: white;
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    border: 2px solid transparent;
}

.unit-card:hover {
    border-color: var(--amber-400);
    transform: translateY(-2px);
}

.unit-card.completed {
    border-color: var(--emerald-400);
    background: linear-gradient(to bottom, white, #ecfdf5);
}

.unit-card .unit-num {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--slate-700);
}

.unit-card .unit-words {
    font-size: 0.75rem;
    color: var(--slate-500);
    margin-top: 0.25rem;
}

.unit-card .unit-status {
    font-size: 0.7rem;
    margin-top: 0.5rem;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    display: inline-block;
}

.unit-card .unit-status.new {
    background: var(--slate-100);
    color: var(--slate-600);
}

.unit-card .unit-status.progress {
    background: #fef3c7;
    color: var(--amber-600);
}

.unit-card .unit-status.done {
    background: #d1fae5;
    color: var(--emerald-700);
}

.unit-test {
    margin-top: 0.45rem;
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--slate-500);
}

.unit-test.good {
    color: var(--emerald-700);
}

.unit-test.mid {
    color: var(--amber-600);
}

.unit-test.bad {
    color: var(--rose-600);
}

/* Learn View */
.learn-header {
    margin-bottom: 1.5rem;
}

/* Make Learn view fit one screen */
body[data-view="learn"] .footer {
    display: none;
}

body[data-view="learn"] .main {
    padding: 1rem;
}

body[data-view="learn"] .learn-header {
    margin-bottom: 0.75rem;
}

body[data-view="learn"] .card-container {
    margin-bottom: 0.75rem;
}

body[data-view="learn"] .word-card {
    padding: 1.25rem 1rem;
}

body[data-view="learn"] .word-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 0.75rem;
}

body[data-view="learn"] .word-en {
    font-size: 1.6rem;
}

body[data-view="learn"] .word-uz {
    font-size: 1.05rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
}

body[data-view="learn"] .word-examples {
    margin-top: 0.75rem;
    max-height: 26vh;
    overflow: auto;
    padding-right: 0.25rem;
}

body[data-view="learn"] .btn-speak {
    margin-top: 0.75rem;
}

.learn-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.learn-unit {
    font-size: 0.9rem;
    color: var(--slate-600);
    font-weight: 600;
}

.learn-counter {
    font-size: 0.85rem;
    color: var(--slate-500);
    background: var(--slate-100);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
}

.progress-bar {
    height: 8px;
    background: var(--slate-200);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--emerald-500), var(--emerald-400));
    border-radius: 4px;
    transition: width 0.4s ease;
    width: 0%;
}

/* Word Card */
.card-container {
    margin-bottom: 1.5rem;
}

.word-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.word-card.hidden {
    display: none;
}

.word-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1rem;
}

.word-icon svg {
    width: 100%;
    height: 100%;
}

.word-en {
    font-size: 2rem;
    font-weight: 700;
    color: var(--slate-800);
    letter-spacing: -0.02em;
}

.word-pr {
    font-size: 1rem;
    color: var(--slate-500);
    margin-top: 0.35rem;
    font-style: italic;
}

.word-uz {
    font-size: 1.25rem;
    color: var(--emerald-600);
    font-weight: 600;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--slate-200);
}

.word-uz.hidden,
.word-examples.hidden {
    display: none;
}

.btn-reveal {
    margin-top: 1.25rem;
    background: var(--slate-100);
    border: 2px solid var(--slate-200);
    color: var(--slate-700);
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-reveal:hover {
    background: var(--slate-200);
}

.btn-reveal:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-reveal.hidden {
    display: none;
}

.word-examples {
    margin-top: 1.25rem;
    text-align: left;
}

.example-item {
    background: var(--slate-50);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-left: 3px solid var(--emerald-500);
}

.example-item .ex-en {
    font-size: 0.9rem;
    color: var(--slate-700);
}

.example-item .ex-uz {
    font-size: 0.8rem;
    color: var(--slate-500);
    margin-top: 0.25rem;
}

.btn-speak {
    margin-top: 1rem;
    background: transparent;
    border: 2px solid var(--slate-300);
    color: var(--slate-600);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.btn-speak:hover {
    border-color: var(--emerald-500);
    color: var(--emerald-600);
}

.btn-speak svg {
    width: 18px;
    height: 18px;
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.action-buttons.hidden {
    display: none;
}

.btn-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: 1rem 0.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    color: white;
}

.btn-action svg {
    width: 24px;
    height: 24px;
}

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

.btn-action:active {
    transform: translateY(0);
}

.btn-know {
    background: linear-gradient(135deg, var(--emerald-500), var(--emerald-600));
}

.btn-partial {
    background: linear-gradient(135deg, var(--amber-500), var(--amber-600));
}

.btn-unknown {
    background: linear-gradient(135deg, var(--rose-500), var(--rose-600));
}

/* Empty State */
.empty-state {
    position: relative;
    overflow: hidden;
    background: white;
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.confetti-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.empty-state-content {
    position: relative;
    z-index: 1;
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    color: var(--emerald-500);
    animation: celebratePop 0.6s ease;
}

@keyframes celebratePop {
    0% { transform: scale(0.5); opacity: 0; }
    70% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}

.empty-icon svg {
    width: 100%;
    height: 100%;
}

.empty-state h3 {
    font-size: 1.5rem;
    color: var(--slate-800);
    margin-bottom: 0.25rem;
}

.empty-en {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--emerald-600);
    margin-bottom: 0.75rem;
}

.empty-state p {
    color: var(--slate-500);
    margin-bottom: 0.5rem;
}

.empty-en-sub {
    font-size: 0.95rem;
    font-style: italic;
    color: var(--slate-400);
    margin-bottom: 1.5rem !important;
}

.btn-primary {
    background: var(--emerald-500);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: var(--emerald-600);
}

.btn-secondary {
    background: white;
    color: var(--slate-700);
    border: 2px solid var(--slate-200);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.btn-secondary:hover {
    background: var(--slate-100);
    border-color: var(--slate-300);
    transform: translateY(-1px);
}

.btn-secondary.test-good {
    background: #ecfdf5;
    border-color: var(--emerald-500);
    color: var(--emerald-700);
}

.btn-secondary.test-mid {
    background: #fffbeb;
    border-color: var(--amber-500);
    color: var(--amber-600);
}

.btn-secondary.test-bad {
    background: #fff1f2;
    border-color: var(--rose-500);
    color: var(--rose-600);
}

.empty-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.test-options {
    margin-top: 1rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.6rem;
    text-align: left;
}

.test-option {
    width: 100%;
    text-align: left;
    background: var(--slate-50);
    border: 2px solid var(--slate-200);
    border-radius: 10px;
    padding: 0.85rem 1rem;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
    font-weight: 700;
    color: var(--slate-800);
}

.test-option:hover {
    background: var(--slate-100);
    border-color: var(--emerald-400);
    transform: translateY(-1px);
}

.test-option.correct {
    background: #ecfdf5;
    border-color: var(--emerald-500);
}

.test-option.wrong {
    background: #fff1f2;
    border-color: var(--rose-500);
}

.test-result.hidden {
    display: none;
}

.test-score {
    font-size: 2rem;
    font-weight: 800;
    color: var(--emerald-700);
    margin: 0.75rem 0 1rem;
}

.test-wrong-list {
    text-align: left;
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: 12px;
    padding: 1rem;
}

.test-wrong-item {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--slate-200);
}

.test-wrong-item:last-child {
    border-bottom: none;
}

.test-wrong-item .w-en {
    font-weight: 800;
    color: var(--slate-800);
}

.test-wrong-item .w-uz {
    color: var(--slate-600);
    margin-top: 0.2rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.25rem 1rem;
    color: var(--slate-400);
    font-size: 0.8rem;
    font-weight: 500;
    opacity: 0.45;
    border-top: 1px solid transparent;
    background: transparent;
}

.footer-disclaimer {
    margin-top: 0.35rem;
    font-size: 0.72rem;
    font-weight: 400;
}

.error-banner {
    background: #fef2f2;
    border: 2px solid var(--rose-500);
    border-radius: var(--radius);
    padding: 1.5rem;
    grid-column: 1 / -1;
}

.error-banner h3 {
    color: var(--rose-600);
    margin-bottom: 0.5rem;
}

.error-banner p {
    color: var(--slate-600);
    margin-bottom: 0.35rem;
}

.error-text {
    color: var(--rose-600);
    text-align: center;
    padding: 2rem;
}

/* Responsive */
@media (max-width: 600px) {
    .main {
        padding: 1rem;
    }

    .word-en {
        font-size: 1.6rem;
    }

    .action-buttons {
        grid-template-columns: 1fr;
    }

    .btn-action {
        flex-direction: row;
        justify-content: center;
        padding: 0.85rem;
    }

    .books-grid {
        grid-template-columns: 1fr;
    }

    .units-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}