: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;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 820px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Header & Mode Switcher */
.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);
}

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

.mode-btn {
    min-height: 40px;
    padding: 0.4rem 1rem;
    border-radius: 10px;
    border: none;
    background: transparent;
    color: var(--ink-muted);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

/* SRS Stats Bar */
.srs-stats-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--cream-card);
    padding: 0.8rem 1.2rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.streak-badge {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--sage-dark);
}

.goal-ring-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.goal-ring {
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 4;
}

.ring-fill {
    fill: none;
    stroke: var(--sage-primary);
    stroke-width: 4;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.3s ease;
}

.ring-text {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--sage-dark);
}

.dashboard-btn {
    min-height: 40px;
    padding: 0.4rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--cream-bg);
    color: var(--sage-dark);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.dashboard-btn:hover {
    background: var(--sage-primary);
    color: var(--warm-white);
}

/* Launcher Card */
.launcher-card {
    background: var(--cream-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.8rem;
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.launcher-header h2 {
    font-size: 1.4rem;
    color: var(--sage-dark);
    margin-bottom: 0.3rem;
}

.launcher-header p {
    color: var(--ink-muted);
    font-size: 0.95rem;
}

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

.launcher-pill {
    min-height: 40px;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--cream-bg);
    color: var(--ink-muted);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.weak-pill {
    border-color: rgba(184, 77, 42, 0.3);
    color: var(--terracotta);
}

.weak-pill.active, .weak-pill:hover {
    background: var(--terracotta);
    color: var(--warm-white);
}

.start-session-btn {
    min-height: 52px;
    padding: 0.8rem;
    border-radius: 14px;
    border: none;
    background: var(--sage-primary);
    color: var(--warm-white);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 0.5rem;
}

.start-session-btn:hover {
    background: var(--sage-dark);
}

/* Question & Practice Card */
.srs-question-box {
    background: var(--cream-bg);
    padding: 1.2rem;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    margin-bottom: 1.25rem;
    text-align: center;
}

.question-type-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--sage-primary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.step-indicator {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--gold-cefr);
    display: block;
}

/* Fill Input Format */
.fill-input-box {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

#srs-blank-input {
    flex: 1;
    min-height: 48px;
    padding: 0.8rem 1rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    background: var(--cream-card);
    color: var(--ink);
    font-size: 1.05rem;
    outline: none;
}

#srs-blank-input:focus {
    border-color: var(--sage-primary);
}

.submit-input-btn {
    min-width: 120px;
    background: var(--sage-primary);
    color: var(--warm-white);
}

/* Nudge Card */
.nudge-card {
    display: flex;
    gap: 0.8rem;
    background: rgba(168, 93, 0, 0.08);
    border: 1px solid rgba(168, 93, 0, 0.3);
    padding: 1rem 1.2rem;
    border-radius: 14px;
    margin-bottom: 1.25rem;
}

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

.nudge-text strong {
    color: var(--gold-cefr);
    display: block;
    font-size: 0.95rem;
    margin-bottom: 0.2rem;
}

.nudge-text p {
    font-size: 0.95rem;
    color: var(--ink);
    margin-bottom: 0.5rem;
}

/* Summary Screen */
.summary-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.summary-stat {
    background: var(--cream-bg);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--sage-dark);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--ink-muted);
    text-align: center;
}

/* Dashboard Modal */
.dashboard-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 1rem;
}

.dashboard-content {
    background: var(--cream-card);
    border-radius: 20px;
    padding: 1.8rem;
    max-width: 680px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.dashboard-header h2 {
    font-size: 1.3rem;
    color: var(--sage-dark);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--ink-muted);
}

.matrix-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.matrix-table th, .matrix-table td {
    padding: 0.75rem;
    text-align: center;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.matrix-table th {
    background: var(--sage-light);
    color: var(--sage-dark);
    font-weight: 700;
}

/* Word-Type Tab Switcher */
.word-type-tabs-bar {
    display: flex;
    gap: 0.5rem;
    background: var(--cream-card);
    padding: 0.35rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
}

.type-tab-btn {
    flex: 1;
    min-height: 44px;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    border: none;
    background: transparent;
    color: var(--ink-muted);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.type-tab-btn.active {
    background: var(--sage-primary);
    color: var(--warm-white);
    box-shadow: 0 2px 8px rgba(45, 90, 39, 0.2);
}

.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-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);
}

/* Navigation Controls Bar */
.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);
}

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

.word-type-badge {
    background: rgba(45, 90, 39, 0.15);
    color: var(--sage-dark);
}

.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;
}

/* Result Card */
.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 & Rule Blocks */
.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);
}

/* Cross-reference Chips */
.ref-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.8rem;
    border-radius: 16px;
    background: var(--cream-card);
    border: 1px solid var(--gold-cefr);
    color: var(--gold-cefr);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    margin: 0.2rem 0.3rem 0.2rem 0;
    transition: all 0.2s ease;
}

.ref-chip:hover {
    background: var(--gold-cefr);
    color: var(--warm-white);
    transform: translateY(-1px);
}

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

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.game-title h2 {
    font-size: 1.3rem;
    color: var(--sage-dark);
}

.score-badge {
    display: flex;
    gap: 1rem;
    background: var(--sage-light);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    color: var(--sage-dark);
    font-weight: 600;
}

.game-prompt-box {
    background: var(--cream-bg);
    padding: 1.2rem;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    text-align: center;
    margin-bottom: 1.25rem;
}

.game-prompt-box h3 {
    font-size: 1.8rem;
    color: var(--sage-primary);
    margin: 0.3rem 0;
}

.game-choice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 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);
}

.feedback-card {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    font-size: 1rem;
}

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

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

.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 */
.empty-state-box {
    background: var(--cream-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-soft);
}

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

.empty-state-box h3 {
    font-size: 1.4rem;
    color: var(--sage-dark);
    margin-bottom: 0.5rem;
}

.empty-state-box p {
    color: var(--ink-muted);
    max-width: 580px;
    margin: 0 auto 1.5rem;
}

.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;
}

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

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        padding: 0.5rem;
    }

    .app-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .verb-title-group h2 {
        font-size: 1.6rem;
    }

    .nav-controls-bar {
        flex-wrap: wrap;
    }

    .nav-btn {
        flex: 1;
        text-align: center;
    }

    .word-type-tabs-bar {
        flex-direction: column;
    }

    .srs-stats-bar {
        flex-direction: column;
        align-items: flex-start;
    }
}