/* Farsi Practice - Warm Editorial Theme */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=DM+Serif+Display&display=swap');

/* Self-hosted Vazirmatn (OFL, vendored — no Google Fonts dependency for Persian) */
@font-face { font-family: 'Vazirmatn'; src: url('fonts/Vazirmatn-Regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Vazirmatn'; src: url('fonts/Vazirmatn-Medium.woff2') format('woff2'); font-weight: 500; font-display: swap; }
@font-face { font-family: 'Vazirmatn'; src: url('fonts/Vazirmatn-SemiBold.woff2') format('woff2'); font-weight: 600; font-display: swap; }
@font-face { font-family: 'Vazirmatn'; src: url('fonts/Vazirmatn-Bold.woff2') format('woff2'); font-weight: 700; font-display: swap; }

:root {
    --bg-primary: #f5f0e8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #ede8e0;
    --border: #e8e0d6;
    --text-primary: #2c2520;
    --text-secondary: #8a7e76;
    --accent: #1e4d8c;
    --accent-hover: #275da3;
    --accent-glow: rgba(30, 77, 140, 0.10);
    --orange: #e86c3a;
    --orange-hover: #d45e2e;
    --success: #6b9e7e;
    --success-bold: #3a7d50;
    --warning: #e86c3a;
    --warning-bold: #c85520;
    --error: #c44d4d;
    --accent-bold: #143a6b;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-pill: 24px;
    --shadow-sm: 0 1px 3px rgba(44, 37, 32, 0.06);
    --shadow-md: 0 4px 16px rgba(44, 37, 32, 0.08);
    --shadow-lg: 0 8px 32px rgba(44, 37, 32, 0.10);
    --font-heading: 'Vazirmatn', 'DM Serif Display', Georgia, serif;
    --font-body: 'Vazirmatn', 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
    touch-action: manipulation;
}

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

/* Fade-in animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.view {
    max-width: 800px;
    margin: 0 auto;
    padding: 24px 20px;
    animation: fadeIn 0.3s ease;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 400;
    color: var(--accent);
    cursor: pointer;
}

/* Buttons */
.btn {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 6px 14px;
    transition: all 0.2s ease;
}

.btn:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-tiny {
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 8px;
}

.btn-sm {
    font-size: 0.85rem;
    padding: 5px 12px;
}

.btn-lg {
    font-size: 1.05rem;
    padding: 10px 28px;
    border-radius: var(--radius-lg);
}

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

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

.btn-danger {
    border-color: var(--error);
    color: var(--error);
}

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

.btn-back {
    color: var(--text-secondary);
    border-color: transparent;
    background: transparent;
}

.btn-back:hover {
    color: var(--text-primary);
}

/* Login Overlay */
.login-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
}

.login-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    text-align: center;
    min-width: 340px;
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.4s ease;
}

.login-logo {
    margin-bottom: 8px;
    line-height: 0;
}

.login-title {
    font-family: var(--font-heading);
    font-size: 1.65rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.login-google-btn {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

.login-error {
    font-size: 0.88rem;
    color: var(--error);
    margin-top: 4px;
}

/* Header user */
.header-user {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-user-pic {
    width: 26px;
    height: 26px;
    border-radius: 50%;
}

.header-user-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.header-signout {
    font-size: 0.75rem;
    padding: 2px 8px;
}

.header-admin-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 4px;
    background: rgba(30, 77, 140, 0.1);
    color: var(--accent);
}

/* Views */
.view-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.view-header h2 {
    font-family: var(--font-heading);
    font-size: 1.45rem;
    font-weight: 400;
    flex: 1;
}

/* Forms */
.form-input, .form-textarea {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: border-color 0.2s ease;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
    resize: vertical;
    min-height: 60px;
}

.inline-form {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: var(--shadow-sm);
}

.inline-form-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    cursor: pointer;
}


/* Deck Grid */
.deck-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
}

.deck-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.deck-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.deck-card-name {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 400;
    padding-right: 0;
    margin-bottom: 4px;
}

.deck-card-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    min-height: 18px;
}

.deck-card-stats {
    display: flex;
    gap: 12px;
    font-size: 0.82rem;
}

.deck-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.deck-stat-value {
    font-weight: 700;
    font-size: 1.25rem;
}

.deck-stat-value.due {
    color: var(--accent-bold);
}

.deck-stat-value.learned {
    color: var(--success-bold);
}

.deck-stat-value.new {
    color: var(--warning-bold);
}

.deck-stat-label {
    color: var(--text-secondary);
    font-size: 0.78rem;
}

.deck-card-badges {
    position: absolute;
    top: 10px;
    inset-inline-end: 10px;
    display: flex;
    gap: 6px;
    z-index: 1;
}

.deck-card-badges:not(:empty) ~ .deck-card-name {
    padding-inline-end: 70px;
}

.badge {
    font-size: 0.7rem;
    padding: 1px 8px;
    border-radius: var(--radius-pill);
    font-weight: 600;
}

.badge-draft {
    background: rgba(232, 108, 58, 0.12);
    color: var(--orange);
}

.badge-published {
    background: rgba(107, 158, 126, 0.15);
    color: var(--success);
}

.badge-reversed {
    background: rgba(30, 77, 140, 0.1);
    color: var(--accent);
}

.deck-next-due {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

.deck-next-due-ready {
    color: var(--success);
    font-weight: 600;
}

.deck-card-actions {
    display: flex;
    gap: 6px;
    margin-top: 10px;
}

/* Study */
.study-progress {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.study-card-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
}

.study-card {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    box-shadow: var(--shadow-md);
}

.study-direction-badge {
    position: absolute;
    top: 12px;
    inset-inline-end: 12px;
    display: flex;
    gap: 4px;
}

.study-card-content {
    font-size: 1.45rem;
    text-align: center;
    word-break: break-word;
    white-space: pre-wrap;
}

.study-reveal-container {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.study-hint {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.study-answer {
    width: 100%;
    margin-top: 16px;
}

.study-answer-divider {
    width: 60%;
    height: 1px;
    background: var(--border);
    margin: 0 auto 16px;
}

.study-answer-content {
    font-size: 1.35rem;
    text-align: center;
    color: var(--accent);
    margin-bottom: 24px;
    word-break: break-word;
    white-space: pre-wrap;
}

.speak-btn {
    background: none;
    border: 1px solid var(--border);
    cursor: pointer;
    padding: 5px 6px;
    border-radius: 8px;
    vertical-align: middle;
    margin-inline-start: 8px;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s;
}

.speak-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
}

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

.rating-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-rate {
    min-width: 80px;
    padding: 10px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    border-radius: var(--radius);
    background: var(--bg-secondary);
}

.rate-interval {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    opacity: 0.7;
}

.rate-key {
    font-size: 0.7rem;
    opacity: 0.5;
    font-weight: 400;
}

.btn-again {
    border-color: var(--error);
    color: var(--error);
}

.btn-again:hover {
    background: var(--error);
    color: #fff;
}

.btn-hard {
    border-color: var(--orange);
    color: var(--orange);
}

.btn-hard:hover {
    background: var(--orange);
    color: #fff;
}

.btn-good {
    border-color: var(--success);
    color: var(--success);
}

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

.btn-easy {
    border-color: #4aad6a;
    color: #4aad6a;
}

.btn-easy:hover {
    background: #4aad6a;
    color: #fff;
}

.study-complete {
    text-align: center;
    padding: 60px 20px;
    animation: fadeIn 0.4s ease;
}

.study-complete-icon {
    font-size: 3rem;
    color: var(--success);
    margin-bottom: 12px;
}

.study-complete h3 {
    font-family: var(--font-heading);
    font-size: 1.45rem;
    font-weight: 400;
    margin-bottom: 8px;
}

.study-complete p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.study-waiting {
    text-align: center;
    padding: 40px 20px;
}

.study-waiting p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 4px;
}

.study-waiting-timer {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 400;
    color: var(--accent);
    margin: 16px 0 24px;
}

/* Deck Management */
.manage-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.manage-section h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 400;
    margin-bottom: 12px;
}

.manage-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.manage-section-header h3 {
    margin-bottom: 0;
}

.manage-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.manage-form-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* Card list in deck manage */
.card-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.card-item {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 12px;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 6px;
}

.card-item-front {
    font-weight: 600;
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-item-arrow {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.card-item-back {
    font-size: 0.9rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.card-item-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
    margin-left: auto;
}

.card-form {
    margin-bottom: 12px;
}

/* Empty & Loading states */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.loading-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

/* Error message */
.error-msg {
    background: rgba(196, 77, 77, 0.08);
    border: 1px solid var(--error);
    border-radius: var(--radius);
    padding: 8px 12px;
    font-size: 0.88rem;
    color: var(--error);
    margin-bottom: 12px;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 20px;
    inset-inline-end: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 16px;
    font-size: 0.88rem;
    box-shadow: var(--shadow-md);
    animation: toastIn 0.25s ease;
}

.toast-error {
    border-color: var(--error);
    color: var(--error);
}

.toast-success {
    border-color: var(--success);
    color: var(--success);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Translations toggle */
.translations-toggle-wrapper {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.btn-translation-toggle {
    align-self: flex-start;
    color: var(--text-secondary);
    border-color: transparent;
    background: transparent;
    padding: 2px 0;
    font-size: 0.78rem;
}

.btn-translation-toggle {
    font-size: 0.85rem;
}

.btn-translation-toggle:hover {
    color: var(--accent);
    border-color: transparent;
}

/* Inline card edit */
.card-inline-edit {
    border-color: var(--accent);
}

/* Per-card translation fields */
.translation-fields { display: flex; flex-direction: column; gap: 6px; }
.translation-fields-inputs { display: flex; flex-direction: column; gap: 6px; }

.translate-has-tip {
    text-decoration: underline dotted var(--text-secondary);
    text-underline-offset: 3px;
    cursor: help;
}

.translate-tooltip {
    position: fixed;
    background: var(--bg-secondary);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    padding: 4px 10px;
    font-size: 0.88rem;
    color: var(--accent);
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -100%);
    box-shadow: var(--shadow-md);
    max-width: calc(100vw - 16px);
    word-wrap: break-word;
    text-align: center;
}

.badge-language {
    background: rgba(30, 77, 140, 0.1);
    color: var(--accent);
}

.form-select {
    padding: 4px 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
}

.language-select-row { display: flex; align-items: center; gap: 16px; }

/* Image previews */
.image-preview-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.image-preview {
    position: relative; width: 60px; height: 60px;
    border-radius: var(--radius); overflow: hidden;
    border: 1px solid var(--border);
}
.image-preview img { width: 100%; height: 100%; object-fit: cover; }
.image-preview-remove {
    position: absolute; top: 2px; right: 2px;
    background: rgba(44, 37, 32, 0.7); color: #fff;
    border: none; border-radius: 50%;
    width: 18px; height: 18px; font-size: 12px;
    cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.study-card-image {
    display: block;
    max-width: 100%; max-height: 300px;
    border-radius: var(--radius); margin-top: 12px;
    margin-left: auto; margin-right: auto;
}

/* Header Streak */
.header-streak {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-inline-end: 8px;
}

.header-streak.streak-active {
    color: var(--orange);
}

/* Dashboard Tabs */
.dashboard-tabs {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    margin-bottom: 20px;
}

.dashboard-tab {
    flex: 1;
    padding: 10px 20px;
    background: none;
    border: none;
    border-radius: 9px;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 1.02rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.dashboard-tab:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.dashboard-tab.active {
    background: var(--accent);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

/* Exercise Set Cards — reuse deck-card styles */
.exercise-set-stats {
    display: flex;
    gap: 16px;
    margin: 12px 0;
}

.exercise-set-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.exercise-set-stat-value {
    font-size: 1.45rem;
    font-weight: 600;
    color: var(--text-primary);
}

.exercise-set-stat-value.items {
    color: var(--accent-bold);
}

.exercise-set-stat-value.accuracy {
    color: var(--success-bold);
}

.exercise-set-stat-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Linked deck info */
.linked-deck-info {
    font-size: 0.88rem;
    color: var(--accent);
    margin-bottom: 4px;
    opacity: 0.85;
}

.linked-deck-badge {
    background: var(--bg-secondary);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    padding: 10px 14px;
    margin-bottom: 16px;
    font-size: 0.95rem;
    color: var(--accent);
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Exercise Session */
.exercise-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    padding: 32px 20px;
    max-width: 500px;
    margin: 0 auto;
}

.exercise-instruction {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.exercise-play-btn {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--accent);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow-md);
}

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

.exercise-play-btn:active {
    transform: scale(0.95);
}

.exercise-input {
    width: 100%;
    max-width: 400px;
    text-align: center;
    font-size: 1.4rem;
    padding: 14px 16px;
}

/* Exercise Input Feedback */
.exercise-input-correct {
    border-color: var(--success) !important;
    color: var(--success) !important;
    background: rgba(107, 158, 126, 0.08) !important;
}

.exercise-input-incorrect {
    border-color: var(--error) !important;
    color: var(--error) !important;
    background: rgba(196, 77, 77, 0.08) !important;
    text-decoration: line-through;
}

.exercise-feedback {
    width: 100%;
    max-width: 400px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.exercise-correct-answer {
    font-size: 1.3rem;
    font-weight: 600;
}

.exercise-correct-answer.correct {
    color: var(--success);
}

.exercise-correct-answer.incorrect {
    color: var(--success);
}

.exercise-translation {
    font-size: 1rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Exercise Progress Bar */
.exercise-progress-bar {
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 8px;
}

.exercise-progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    width: 0%;
    transition: width 0.4s ease;
}

/* Emoji Exercise Display */
.exercise-emoji-display {
    font-size: 5rem;
    text-align: center;
    margin: 1rem 0;
    line-height: 1.2;
}

.exercise-article-hint {
    color: var(--accent) !important;
    font-weight: 600;
}

.card-item-emoji {
    font-size: 1.3rem;
    margin-right: 0.25rem;
}

.card-item-alt {
    color: var(--text-muted);
    font-size: 0.85em;
    font-style: italic;
}

/* Exercise Play Button Wrapper */
.exercise-play-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Exercise Result Flash — overlays the play button */
.exercise-result-flash {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.5);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    font-weight: 700;
    z-index: 10;
    pointer-events: none;
    opacity: 0;
}

.exercise-result-flash.flash-correct {
    display: flex;
    background: rgba(107, 158, 126, 0.25);
    color: var(--success);
    animation: resultFlash 0.7s ease forwards;
}

.exercise-result-flash.flash-incorrect {
    display: flex;
    background: rgba(196, 77, 77, 0.25);
    color: var(--error);
    animation: resultFlash 0.7s ease forwards;
}

@keyframes resultFlash {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
    30% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    70% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    100% { opacity: 0; transform: translate(-50%, -50%) scale(1.1); }
}

.exercise-action-btn {
    display: none;
}

.exercise-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Exercise Complete */
.exercise-complete {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 48px 20px;
    text-align: center;
    animation: fadeIn 0.4s ease;
}

.exercise-complete-icon {
    font-size: 3rem;
    color: var(--success);
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(107, 158, 126, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
}

.exercise-complete h3 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-size: 1.45rem;
    font-weight: 400;
}

.exercise-complete p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* Responsive */
@media (max-width: 600px) {
    .deck-grid {
        grid-template-columns: 1fr;
    }

    .study-card {
        padding: 24px 18px;
    }

    .study-card-content {
        font-size: 1.25rem;
    }

    .rating-buttons {
        gap: 6px;
    }

    .btn-rate {
        min-width: 65px;
        padding: 8px 10px;
        font-size: 0.88rem;
        min-height: 44px;
    }

    /* Prevent iOS zoom on input focus */
    .form-input, .form-textarea, select, input[type="text"], input[type="number"], textarea {
        font-size: 16px;
    }

    /* Touch-friendly targets */
    .btn, .btn-sm, .btn-tiny, .checkbox-label, .toggle-label {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }

    /* Hide keyboard hints on mobile */
    .study-hint, .rate-key {
        display: none;
    }

    /* Card items: stack on mobile */
    .card-item {
        flex-wrap: wrap;
    }

    .card-item-arrow {
        display: none;
    }

    .card-item-front, .card-item-back {
        width: 100%;
        white-space: normal;
    }

    /* Login card responsive */
    .login-card {
        width: 90vw;
        min-width: unset;
        padding: 36px 24px;
    }

    /* Manage form actions stack vertically */
    .manage-form-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .manage-form-actions .btn,
    .manage-form-actions .toggle-label {
        justify-content: center;
    }

    /* Header responsive */
    header {
        padding: 8px 12px;
    }

    .header-user-name {
        max-width: 100px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    /* --- Dashboard tabs: proper segmented control on mobile --- */
    .dashboard-tabs {
        border-radius: var(--radius-lg);
        padding: 3px;
        gap: 3px;
        margin-bottom: 16px;
    }

    .dashboard-tab {
        padding: 12px 16px;
        font-size: 1.05rem;
        font-weight: 600;
        border-radius: 9px;
        min-height: 48px;
    }

    /* --- Exercise set cards: better layout on mobile --- */
    .exercise-set-stats {
        gap: 24px;
        margin: 14px 0;
    }

    .exercise-set-stat-value {
        font-size: 1.55rem;
    }

    .exercise-set-stat-label {
        font-size: 0.85rem;
    }

    .linked-deck-info {
        font-size: 0.85rem;
        margin-bottom: 2px;
    }

    /* Make Practice button full-width and prominent on exercise cards */
    .deck-card-actions {
        margin-top: 12px;
    }

    .deck-card-actions .btn-primary {
        flex: 1;
        justify-content: center;
        min-height: 44px;
    }

    /* --- Exercise session: match desktop feel --- */
    .exercise-container {
        padding: 28px 20px;
        gap: 24px;
    }

    .exercise-play-btn {
        width: 80px;
        height: 80px;
    }

    .exercise-play-btn svg {
        width: 40px;
        height: 40px;
    }

    .exercise-input {
        font-size: 1.4rem;
        padding: 14px 16px;
        max-width: 100%;
        text-align: center;
    }

    .exercise-instruction {
        font-size: 1.2rem;
    }

    .exercise-feedback {
        max-width: 100%;
    }

    .exercise-correct-answer {
        font-size: 1.3rem;
    }

    .exercise-translation {
        font-size: 1rem;
    }

    .exercise-hint {
        display: none;
    }

    .exercise-action-btn {
        display: inline-flex;
        width: 100%;
        max-width: 400px;
        min-height: 52px;
        font-size: 1.1rem;
        font-weight: 600;
        justify-content: center;
        border-radius: var(--radius-lg);
    }

    /* Exercise complete */
    .exercise-complete {
        padding: 40px 16px;
    }

    .exercise-complete h3 {
        font-size: 1.35rem;
    }
}

/* --- Linked Decks (Exercise Set Manage) --- */

.linked-decks-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.linked-deck-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.2s;
}

.linked-deck-checkbox:hover {
    border-color: var(--accent);
}

.linked-deck-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

.section-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

/* ===== Grammar ===== */

.exercise-section-heading {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 1.5rem 0 0.5rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    width: 100%;
    grid-column: 1 / -1;
}

.grammar-unlock-info {
    font-style: italic;
    min-height: 0;
}

.grammar-locked {
    opacity: 0.55;
    pointer-events: none;
    position: relative;
}

.grammar-locked::after {
    content: '';
    position: absolute;
    top: 10px;
    right: 12px;
    width: 18px;
    height: 18px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3E%3Crect x='3' y='11' width='18' height='11' rx='2'/%3E%3Cpath d='M7 11V7a5 5 0 0110 0v4'/%3E%3C/svg%3E") no-repeat center;
    background-size: contain;
}

.grammar-progress-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    margin-top: 8px;
    overflow: hidden;
    display: flex;
}

.grammar-progress-bar-fill {
    height: 100%;
    background: #1565c0;
    transition: width 0.3s;
}

.grammar-progress-bar-fill:first-child {
    border-radius: 2px 0 0 2px;
}

.grammar-progress-bar-fill:last-child {
    border-radius: 0 2px 2px 0;
}

.grammar-progress-bar-fill:only-child {
    border-radius: 2px;
}

.grammar-progress-bar-due {
    height: 100%;
    background: #e69500;
    transition: width 0.3s;
}

.grammar-progress-bar-due:last-child {
    border-radius: 0 2px 2px 0;
}

.grammar-progress-complete .grammar-progress-bar-fill,
.grammar-progress-complete .grammar-progress-bar-due {
    background: #4caf50;
}

.grammar-btn-optional {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    opacity: 0.55;
    font-weight: 400;
}

.grammar-btn-optional:hover {
    opacity: 0.8;
    border-color: var(--text-secondary);
}

/* Grammar Lesson View */

.grammar-lesson-content {
    max-width: 640px;
    margin: 0 auto;
    padding: 1rem;
}

.grammar-lesson-section {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 1.2rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
}

.grammar-lesson-section h3 {
    margin: 0 0 0.7rem;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.grammar-rule-text {
    line-height: 1.7;
    color: var(--text-primary);
}

.grammar-rule-text p {
    margin: 0 0 0.9rem;
}

.grammar-rule-text p:last-child {
    margin-bottom: 0;
}

.grammar-rule-text strong {
    color: var(--accent);
    font-weight: 700;
}

.grammar-examples-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.grammar-example-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0;
    border-bottom: 1px solid var(--border);
}

.grammar-example-row:last-child {
    border-bottom: none;
}

.grammar-example-text {
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.grammar-example-english {
    color: var(--text-secondary);
    font-style: italic;
    flex: 1;
}

.grammar-example-tts {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--accent);
    padding: 2px;
    display: flex;
    align-items: center;
}

.grammar-tips-box {
    border-left: 4px solid var(--accent);
}

.grammar-tips-box div {
    line-height: 1.6;
    color: var(--text-primary);
}

.grammar-start-btn {
    display: block;
    width: 100%;
    margin-top: 1rem;
}

/* Grammar Practice View */

.grammar-container {
    max-width: 640px;
    margin: 0 auto;
    padding: 1rem;
    text-align: center;
}

.grammar-sentence {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.grammar-blank-marker {
    display: inline-block;
    border-bottom: 2px solid var(--accent);
    min-width: 60px;
    margin: 0 2px;
}

.grammar-english-hint {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.grammar-fill-input {
    text-align: center;
    font-size: 1.1rem;
    max-width: 300px;
    margin: 0 auto 1rem;
}

.grammar-fill-input.grammar-input-correct {
    border-color: var(--success);
    color: var(--success);
}

.grammar-fill-input.grammar-input-incorrect {
    border-color: var(--error);
    color: var(--error);
}

/* MC options */

.grammar-mc-question {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.grammar-mc-options {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    max-width: 360px;
    margin: 0 auto 1rem;
}

.grammar-mc-option {
    padding: 0.8rem 1.2rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    cursor: pointer;
    font-size: 1.05rem;
    text-align: left;
    transition: border-color 0.15s, background 0.15s;
    color: var(--text-primary);
}

.grammar-mc-option:hover {
    border-color: var(--accent);
}

.grammar-mc-option.mc-selected {
    border-color: var(--accent);
    background: rgba(198, 134, 76, 0.1);
}

.grammar-mc-option.mc-correct {
    border-color: var(--success);
    background: rgba(107, 158, 126, 0.15);
}

.grammar-mc-option.mc-incorrect {
    border-color: var(--error);
    background: rgba(196, 77, 77, 0.1);
}

.grammar-mc-option.mc-disabled {
    pointer-events: none;
}

.grammar-mc-key {
    display: inline-block;
    width: 22px;
    height: 22px;
    line-height: 22px;
    text-align: center;
    border-radius: 4px;
    background: var(--bg-tertiary);
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 0.6rem;
    color: var(--text-secondary);
}

/* Sentence order */

.grammar-so-prompt {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1rem;
}

.grammar-answer-area {
    min-height: 54px;
    box-sizing: border-box;
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 0.5rem;
    margin-bottom: 0.8rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: center;
    align-content: center;
}

.grammar-answer-area.has-tiles {
    border-style: solid;
    border-color: var(--accent);
}

.grammar-word-pool {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: center;
    margin-bottom: 1rem;
    min-height: 42px;
}

.grammar-word-tile {
    padding: 0.5rem 0.9rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--card-bg);
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.15s, transform 0.1s;
    user-select: none;
    color: var(--text-primary);
}

.grammar-word-tile:active {
    transform: scale(0.95);
}

.grammar-word-tile.tile-used {
    opacity: 0.3;
    pointer-events: none;
}

.grammar-word-tile.tile-in-answer {
    background: rgba(198, 134, 76, 0.15);
    border-color: var(--accent);
}

/* (TTS buttons are now inline with sentences — see .grammar-inline-tts) */

/* Feedback & explanation */

.grammar-feedback {
    margin-bottom: 0.8rem;
}

.grammar-feedback-result {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.grammar-feedback-result.feedback-correct {
    color: var(--success);
}

.grammar-feedback-result.feedback-incorrect {
    color: var(--error);
}

.grammar-sentence-feedback {
    margin-top: 0.5rem;
}

.grammar-sentence-feedback-wrong {
    text-decoration: line-through;
    color: var(--error);
    font-size: 1.05rem;
    margin-bottom: 0.3rem;
}

.grammar-sentence-feedback-correct {
    color: var(--success);
    font-weight: 600;
    font-size: 1.05rem;
}

.grammar-explanation {
    background: var(--card-bg);
    border-left: 4px solid var(--accent);
    border-radius: 6px;
    padding: 0.8rem 1rem;
    margin-bottom: 1rem;
    text-align: left;
    line-height: 1.55;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.fa-text-hl {
    color: var(--accent);
    font-weight: 700;
}

.fa-text {
    color: var(--accent);
}

.grammar-action-btn {
    width: 100%;
    max-width: 300px;
}

.grammar-hint {
    color: var(--text-secondary);
    font-size: 0.82rem;
    margin-top: 0.5rem;
}

/* Grammar topic stats on card */
.grammar-stats-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 0.4rem;
}

/* Grammar manage type badge */
.grammar-type-badge {
    display: inline-block;
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 700;
    text-transform: uppercase;
    flex-shrink: 0;
    letter-spacing: 0.03em;
}

.grammar-type-fill_blank { background: rgba(198, 134, 76, 0.15); color: var(--accent); }
.grammar-type-multiple_choice { background: rgba(107, 158, 126, 0.15); color: var(--success); }
.grammar-type-sentence_order { background: rgba(124, 139, 176, 0.18); color: #7c8bb0; }

/* Grammar exercise form */
.grammar-ex-form {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 12px;
    margin-bottom: 6px;
}

.grammar-ex-form-row {
    display: flex;
    gap: 6px;
    margin-bottom: 6px;
}

.grammar-ex-form-row .form-input {
    flex: 1;
    min-width: 0;
}

.grammar-ex-type-select {
    max-width: 160px;
    flex: 0 0 auto !important;
}

.grammar-ex-form-fields {
    border-top: 1px solid var(--border);
    padding-top: 8px;
    margin-top: 2px;
    margin-bottom: 4px;
}