:root {
    --sage-primary: var(--sage);
    --sage-dark: var(--sage-dark);
    --sage-light: var(--sage-light);
    --terracotta: var(--coral);
    --cream-bg: var(--paper-bg);
    --cream-card: var(--surface-color);
    --ink: var(--ink);
    --ink-muted: var(--ink-soft);
    --border-color: var(--border);
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.05);
    --blue-vt: var(--blue);
    --orange-vi: var(--coral);
    --purple-both: var(--ire-col);
    --gold-cefr: var(--honey);
    --teal-sep: var(--sage);
}

@media (prefers-color-scheme: dark) {
    :root {
        --sage-primary: var(--sage);
        --sage-dark: var(--sage-dark);
        --cream-bg: var(--paper-bg);
        --cream-card: var(--surface-color);
        --ink: var(--ink);
        --ink-muted: var(--ink-soft);
        --border-color: var(--border);
        --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.3);
    }
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
}

body {
    font-family: var(--font-sans);
    background: var(--paper-gradient, var(--cream-bg));
    background-attachment: fixed;
    color: var(--ink);
    line-height: 1.6;
    padding: 1rem;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 820px;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl, 1.5rem);
}

/* Header & Main Nav */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--cream-card);
    padding: 1.25rem 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-badge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-icon {
    font-size: 2.2rem;
}

.brand-text h1 {
    font-size: 1.35rem;
    color: var(--sage-dark);
    font-weight: 700;
}

.brand-text .tagline {
    font-size: 0.85rem;
    color: var(--ink-muted);
}

.main-nav-bar {
    display: flex;
    gap: 0.4rem;
    background: var(--cream-bg);
    padding: 0.3rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.nav-mode-btn {
    min-height: 40px;
    padding: 0.4rem 0.9rem;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--ink-muted);
    font-weight: 700;
    font-size: 0.92rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-mode-btn:hover {
    color: var(--sage-dark);
    background: var(--sage-light);
}

.nav-mode-btn.active {
    background: var(--sage-primary);
    color: var(--warm-white);
}

/* Search Section & Filters */
.search-section {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Word Type Switcher Tab Bar */
.word-type-tab-bar {
    display: flex;
    gap: 0.5rem;
    background: var(--cream-card);
    padding: 0.4rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
}

.word-type-tab {
    flex: 1;
    min-height: 44px;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    border: none;
    background: transparent;
    color: var(--ink-muted);
    font-size: 0.98rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.word-type-tab:hover {
    background: var(--sage-light);
    color: var(--sage-dark);
}

.word-type-tab.active {
    background: var(--sage-dark);
    color: var(--warm-white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.filter-pills-bar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-pill {
    min-height: 40px;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--cream-card);
    color: var(--ink-muted);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-pill:hover, .filter-pill.active {
    background: var(--sage-primary);
    color: var(--warm-white);
    border-color: var(--sage-primary);
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--cream-card);
    border: 2px solid var(--border-color);
    border-radius: 14px;
    padding: 0.5rem 1rem;
    box-shadow: var(--shadow-soft);
    transition: border-color 0.2s;
}

.search-box:focus-within {
    border-color: var(--sage-primary);
}

.search-icon {
    font-size: 1.2rem;
    margin-right: 0.75rem;
}
.search-icon.cosy-icon {
    width: 1.1rem;
    height: 1.1rem;
    color: var(--ink-muted, #7a7974);
}
.no-results-icon {
    width: 2.5rem;
    height: 2.5rem;
    margin: 0 auto 0.5rem;
    display: block;
    color: var(--ink-faint, #bab9b4);
}
.category-header-icon {
    width: 1.3rem;
    height: 1.3rem;
    color: var(--teal, #2f4a36);
    vertical-align: middle;
    margin-right: 0.1rem;
}

.search-box input {
    width: 100%;
    min-height: 44px;
    border: none;
    outline: none;
    background: transparent;
    font-size: 1.05rem;
    color: var(--ink);
}

.clear-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--ink-muted);
    cursor: pointer;
    min-width: 44px;
    min-height: 44px;
}

.suggestions-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--cream-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-top: 0.5rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    z-index: 100;
    overflow: hidden;
}

.suggestion-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.2rem;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    min-height: 44px;
}

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

.suggestion-item:hover {
    background: var(--sage-light);
}

/* Practice Mode Header & Controls */
.practice-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--cream-card);
    padding: 1rem 1.25rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.streak-widget {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.streak-fire {
    font-size: 2rem;
}

.streak-count {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--sage-dark);
}

.goal-sub {
    font-size: 0.82rem;
    color: var(--ink-muted);
}

.practice-filters-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.select-dropdown {
    min-height: 42px;
    padding: 0.4rem 0.8rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--cream-bg);
    color: var(--ink);
    font-size: 0.88rem;
    font-weight: 600;
    outline: none;
}

.start-session-btn {
    min-height: 42px;
    padding: 0.5rem 1.2rem;
    border-radius: 10px;
    border: none;
    background: var(--sage-primary);
    color: var(--warm-white);
    font-weight: 700;
    font-size: 0.92rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.start-session-btn:hover {
    background: var(--sage-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Practice Card & Question Prompts */
.practice-card {
    background: var(--cream-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-soft);
    transition: transform var(--transition-speed, 0.3s) ease, box-shadow var(--transition-speed, 0.3s) ease;
}

.practice-card:hover {
    box-shadow: var(--shadow);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
}

.meta-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-count {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--ink-muted);
}

.prompt-badge {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.blank-badge { background: rgba(37, 99, 235, 0.12); color: var(--blue-vt); }
.spot-badge { background: rgba(234, 88, 12, 0.12); color: var(--orange-vi); }
.mc-badge { background: rgba(45, 90, 39, 0.12); color: var(--sage-primary); }

.blank-prompt, .mistake-spot-prompt, .mc-prompt {
    background: var(--cream-bg);
    padding: 1.25rem;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    text-align: center;
    margin-bottom: 1.25rem;
}

.sentence-box {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--ink);
    margin-top: 0.4rem;
}

.mistake-line {
    font-size: 1.1rem;
    color: var(--terracotta);
    font-weight: 600;
    margin-top: 0.3rem;
}

.highlight-word {
    color: var(--sage-dark);
}

.choice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.choice-btn {
    min-height: 48px;
    padding: 0.8rem 1rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    background: var(--cream-card);
    color: var(--ink);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.choice-btn:hover {
    border-color: var(--sage-primary);
    background: var(--sage-light);
    color: var(--sage-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Inline Feedback Box */
.inline-feedback-card {
    padding: 1.1rem 1.25rem;
    border-radius: 14px;
    margin-bottom: 1.25rem;
    animation: slideDown 0.25s ease-out;
}

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

.feedback-correct {
    background: var(--green-light);
    color: var(--sage-dark);
    border: 1px solid var(--border);
}

.feedback-wrong {
    background: var(--rose-light);
    color: var(--rose);
    border: 1px solid var(--border);
}

.feedback-title {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
}

.feedback-rule, .feedback-mistake {
    font-size: 0.95rem;
    margin-top: 0.2rem;
}

/* Session Summary Box */
.session-summary-box {
    text-align: center;
    padding: 1.5rem 0.5rem;
}

.summary-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 0.5rem;
}

.session-summary-box h3 {
    font-size: 1.6rem;
    color: var(--sage-dark);
    margin-bottom: 0.4rem;
}

.summary-stats-grid {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.stat-box {
    background: var(--cream-bg);
    padding: 1rem 1.5rem;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    min-width: 120px;
}

.stat-num {
    display: block;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--sage-primary);
}

.stat-lbl {
    font-size: 0.82rem;
    color: var(--ink-muted);
    font-weight: 600;
}

.summary-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.secondary-btn {
    background: var(--sage-light) !important;
    color: var(--sage-dark) !important;
    border: 1px solid var(--border-color) !important;
}

/* Nudge Card */
.nudge-card {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    background: rgba(217, 119, 6, 0.08);
    border: 1px solid rgba(217, 119, 6, 0.3);
    padding: 1rem 1.25rem;
    border-radius: 14px;
    text-align: left;
    margin: 1rem 0;
}

.nudge-icon {
    font-size: 1.8rem;
}

/* Dashboard Matrix View */
.dashboard-header-card, .dashboard-matrix-card {
    background: var(--cream-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-soft);
    margin-bottom: 1.25rem;
    transition: transform var(--transition-speed, 0.3s) ease, box-shadow var(--transition-speed, 0.3s) ease;
}

.dashboard-header-card:hover, .dashboard-matrix-card:hover {
    box-shadow: var(--shadow);
}

.dash-summary-grid {
    display: flex;
    gap: 1rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.summary-metric {
    flex: 1;
    background: var(--cream-bg);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
    min-width: 120px;
}

.metric-val {
    display: block;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--sage-dark);
}

.metric-lbl {
    font-size: 0.82rem;
    color: var(--ink-muted);
    font-weight: 600;
}

.dash-row {
    margin-top: 1rem;
}

.dash-type-head {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--sage-dark);
    margin-bottom: 0.5rem;
}

.dash-cells-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
}

.dash-cell {
    background: var(--cream-bg);
    padding: 0.85rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.cell-level {
    font-weight: 800;
    font-size: 0.85rem;
    color: var(--gold-cefr);
    margin-bottom: 0.3rem;
}

.cell-bar-box {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.4rem;
}

.cell-bar-fill {
    height: 100%;
    background: var(--sage-primary);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.cell-text {
    font-size: 0.78rem;
    color: var(--ink-muted);
    font-weight: 600;
}

/* Badges & Result Cards */
.badge {
    display: inline-block;
    padding: 0.3rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
}

.phrasal-badge { background: rgba(124, 58, 237, 0.15); color: var(--purple-both); }
.sep-badge { background: rgba(13, 148, 136, 0.15); color: var(--teal-sep); }
.trans-vt { background: rgba(37, 99, 235, 0.12); color: var(--blue-vt); }
.trans-vi { background: rgba(234, 88, 12, 0.12); color: var(--orange-vi); }
.trans-both { background: rgba(124, 58, 237, 0.12); color: var(--purple-both); }
.prep-badge { background: rgba(45, 90, 39, 0.12); color: var(--sage-primary); }
.cefr-badge { background: rgba(217, 119, 6, 0.12); color: var(--gold-cefr); }

.tts-btn {
    min-height: 44px;
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--cream-bg);
    color: var(--ink);
    font-size: 0.85rem;
    cursor: pointer;
}

.verb-result-card {
    background: var(--cream-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-soft);
}

.verb-title-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.verb-title-group h2 {
    font-size: 2rem;
    color: var(--sage-dark);
}

.lexical-box {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.def-block, .usage-block, .noun-parallel-block, .grammar-rule-block, .mistake-block, .examples-block, .antonyms-block {
    background: var(--cream-bg);
    padding: 1rem 1.2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.noun-parallel-block {
    background: rgba(217, 119, 6, 0.08);
    border-color: rgba(217, 119, 6, 0.3);
}

.noun-parallel-block .lexical-label {
    color: var(--gold-cefr);
}

.noun-parallel-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink);
}

.mistake-block {
    background: rgba(200, 90, 50, 0.08);
    border-color: rgba(200, 90, 50, 0.25);
}

.lexical-label {
    display: block;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--sage-primary);
    margin-bottom: 0.4rem;
}

.mistake-block .lexical-label { color: var(--terracotta); }
.def-text, .usage-text, .rule-text, .mistake-text { font-size: 1rem; color: var(--ink); }

.examples-list {
    list-style-type: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.examples-list li {
    padding-left: 1.2rem;
    position: relative;
    font-size: 0.98rem;
}

.examples-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--sage-primary);
    font-weight: bold;
}

.game-btn {
    min-height: 48px;
    width: 100%;
    padding: 0.8rem;
    border-radius: 12px;
    border: none;
    background: var(--sage-primary);
    color: var(--warm-white);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
}

.empty-state-box {
    background: var(--surface-color, var(--cream-card));
    border: 2px dashed var(--border-color);
    border-radius: 20px;
    padding: 2.8rem 1.8rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.empty-icon { font-size: 3rem; display: block; margin-bottom: 0.75rem; }
.empty-state-box h3 { font-family: var(--font-serif); font-size: 1.5rem; color: var(--sage-dark); margin-bottom: 0.5rem; }
.empty-state-box p { color: var(--ink-muted); max-width: 580px; margin: 0 auto 1.5rem; line-height: 1.6; }

.quick-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    align-items: center;
}

.tag-btn, .antonym-pill {
    min-height: 44px;
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--cream-bg);
    color: var(--sage-dark);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.phrasal-tag {
    border-color: rgba(124, 58, 237, 0.3);
    color: var(--purple-both);
}

.tag-btn:hover, .antonym-pill:hover {
    background: var(--sage-primary);
    color: var(--warm-white);
}

.pills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.3rem;
}

.xref-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.35rem 0.85rem;
    border-radius: 16px;
    background: rgba(45, 90, 39, 0.1);
    color: var(--sage-primary);
    border: 1px solid rgba(45, 90, 39, 0.25);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    margin-top: 0.4rem;
}

.xref-chip:hover {
    background: var(--sage-primary);
    color: var(--warm-white);
    border-color: var(--sage-primary);
    transform: translateY(-1px);
}

.nav-controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px dashed var(--border-color);
}

.nav-btn {
    min-height: 44px;
    padding: 0.5rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--cream-bg);
    color: var(--ink);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
}

.nav-btn:hover { background: var(--sage-light); color: var(--sage-dark); }
.nav-btn.random-btn { background: rgba(45, 90, 39, 0.1); color: var(--sage-primary); border-color: rgba(45, 90, 39, 0.2); }

.app-footer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--ink-muted);
    padding: 1rem 0;
}

@media (max-width: 768px) {
    body { padding: 0.5rem; overflow-x: hidden; }
    .app-container { max-width: 100%; width: 100%; box-sizing: border-box; overflow-x: hidden; }
    .app-header { flex-direction: column; align-items: stretch; max-width: 100%; box-sizing: border-box; }
    .logo-badge { max-width: 100%; }
    .brand-text h1 { font-size: 1.2rem; word-break: break-word; }
    .brand-text .tagline { font-size: 0.8rem; word-break: break-word; }
    .practice-header-bar { flex-direction: column; align-items: stretch; max-width: 100%; box-sizing: border-box; }
    .main-nav-bar { width: 100%; justify-content: space-between; flex-wrap: wrap; box-sizing: border-box; }
    .nav-mode-btn { flex: 1 1 auto; text-align: center; font-size: 0.85rem; padding: 0.4rem 0.5rem; }
    .word-type-tab-bar { flex-wrap: wrap; max-width: 100%; box-sizing: border-box; }
    .word-type-tab { flex: 1 1 auto; min-width: fit-content; text-align: center; font-size: 0.88rem; padding: 0.4rem 0.6rem; }
    .pattern-selector-bar, .filter-pills-bar { overflow-x: auto; max-width: 100%; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; box-sizing: border-box; }
    .forms-matrix-card, .table-container, .choice-grid { max-width: 100%; overflow-x: auto; box-sizing: border-box; }
}

@media (max-width: 390px) {
    body { padding: 0.25rem; }
    .app-container { padding: 0.25rem; }
    .brand-text h1 { font-size: 1.1rem; }
    .brand-text .tagline { font-size: 0.75rem; }
    .main-nav-bar { gap: 0.2rem; padding: 0.2rem; }
    .nav-mode-btn { padding: 0.35rem 0.4rem; font-size: 0.8rem; }
    .choice-btn { width: 100% !important; max-width: 100% !important; box-sizing: border-box !important; }
}