html,
body {
    min-height: 100%;
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    margin: 0;
    background: #e9edf9;
    color: #0f172a;
    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: clamp(10px, 3vw, 20px) clamp(16px, 5vw, 32px);
}

.header-logo {
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    color: inherit;
    letter-spacing: -0.01em;
}

.header-logo:hover {
    text-decoration: underline;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.auth-login {
    background: none;
    border: 1px solid #999;
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.85rem;
    cursor: pointer;
    color: inherit;
}

.auth-login:hover {
    border-color: #555;
}

.auth-user {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
}

.auth-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
}

.auth-logout-icon {
    font-size: 0.75rem;
    opacity: 0.5;
}

.auth-user:hover .auth-logout-icon {
    opacity: 1;
}

.header-lang {
    text-decoration: none;
    font-size: 1.25rem;
    line-height: 1;
}

.header-lang:hover {
    opacity: 0.7;
}

main#app {
    flex: 1;
    padding: clamp(16px, 5vw, 32px);
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
}

main#app > .home {
    align-self: stretch;
}

.home {
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
}

.columns {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.col {
    flex: 1 1 0;
    min-width: 230px;
}

.card {
    border: 1px solid #e5e7f3;
    border-radius: 16px;
    padding: 22px 24px;
    margin-bottom: 18px;
    background: #ffffff;
    max-width: 420px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    box-shadow: 0 18px 32px rgba(15, 23, 42, 0.12);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
}

.card-head h2 {
    margin-bottom: 0;
}

.card-head #exerciseProgress {
    white-space: nowrap;
    flex-shrink: 0;
}

.card h2 {
    font-size: 1.65rem;
    margin-bottom: 14px;
}

.card p {
    font-size: 1.15rem;
    line-height: 1.6;
}

.card.small {
    padding: 10px 12px;
    border-radius: 8px;
    box-shadow: none;
    margin-bottom: 12px;
}

.card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.card-link:hover .card {
    transform: translateY(-2px);
    box-shadow: 0 24px 36px rgba(15, 23, 42, 0.14);
}

.home .card {
    max-width: none;
    box-shadow: none;
    border-radius: 6px;
    padding: 14px 16px;
    margin: 0;
    border: 1px solid #ddd;
}

.card-disabled {
    opacity: 0.45;
    pointer-events: none;
    cursor: default;
}

.home .card h2 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.home .card p {
    font-size: 1rem;
}

.muted {
    opacity: 0.6;
}

/* === Language pair selector === */
.lang-select {
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
}

.lang-select h1 {
    font-size: clamp(2rem, 6vw, 3rem);
    margin-bottom: 8px;
}

.lang-select .tagline {
    font-size: 1rem;
    color: #64748b;
    margin: 4px 0 0;
}

.lang-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 32px;
    text-align: left;
}

.lang-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 20px 22px;
    border-radius: 14px;
    max-width: none;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
}

.lang-card h2 {
    font-size: 1.1rem;
    margin: 0;
}

.lang-card p {
    font-size: 0.9rem;
    margin: 0;
    color: #64748b;
}

.lang-flag {
    font-size: 2rem;
    line-height: 1;
    margin-bottom: 4px;
}

.card-link:hover .lang-card {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.14);
}

main#app > .lang-select {
    align-self: stretch;
}

/* === Gaps full-screen layout === */
.gaps-screen {
    flex: 1;
    width: 100%;
    background: radial-gradient(circle at top, #f6f9ff 0%, #eef2ff 45%, #e7ecff 100%);
    border-radius: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: clamp(24px, 6vw, 48px);
    box-shadow: inset 0 0 0 1px rgba(120, 138, 255, 0.07), 0 32px 60px rgba(15, 23, 42, 0.22);
    box-sizing: border-box;
}

.card-gap {
    max-width: 520px;
    width: 100%;
    min-height: clamp(540px, 85vh, 680px);
    display: flex;
    flex-direction: column;
    gap: clamp(18px, 3vw, 28px);
    padding: clamp(28px, 5vw, 36px);
    border-radius: 26px;
    box-shadow: 0 22px 48px rgba(15, 23, 42, 0.16);
    border: none;
}

.card-gap__header {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.card-gap h2 {
    font-size: clamp(1.5rem, 1.8rem, 2rem);
    margin-bottom: 8px;
}

.card-gap__sentence {
    font-size: clamp(1.35rem, 1.5rem, 1.65rem);
    line-height: 1.6;
    margin: 0;
}

.card-gap__input {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.card-gap__actions,
.sentence-actions {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

#gapInput,
#prodInput {
    border: 2px solid rgba(99, 102, 241, 0.25);
    background: rgba(255, 255, 255, 0.85);
    border-radius: 14px;
    font-size: 1.25rem;
    padding: 16px 18px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.card-gap__actions button,
.sentence-actions button {
    width: 100%;
    box-sizing: border-box;
    font-size: 1.25rem;
    padding: 16px 18px;
    border-radius: 14px;
    font-weight: 700;
    letter-spacing: 0.02em;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

#gapInput:focus,
#prodInput:focus {
    outline: none;
    border-color: rgba(99, 102, 241, 0.6);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.25);
}

#checkGap,
#checkSentence {
    background: linear-gradient(135deg, #16a34a 0%, #059669 100%);
    color: #ffffff;
}

#nextGapBtn,
#nextSentence,
#nextArtikel,
#pgNext {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1d4ed8;
}

#prevGapBtn,
#prevSentence,
#prevWord,
#nextWord,
#pgPrev {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
    color: #1f2937;
}

#resetSentence,
#pgReset {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5f5 100%);
    color: #1f2937;
}

#prevGapBtn:disabled,
#prevSentence:disabled,
#prevWord:disabled,
#pgPrev:disabled {
    opacity: 0.4;
    cursor: default;
}

#checkGap:hover,
#checkSentence:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(22, 163, 74, 0.35);
}

#nextGapBtn:hover,
#nextSentence:hover,
#nextArtikel:hover,
#pgNext:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(59, 130, 246, 0.25);
}

#resetSentence:hover,
#pgReset:hover,
#prevGapBtn:hover:not(:disabled),
#prevSentence:hover:not(:disabled),
#prevWord:hover:not(:disabled),
#nextWord:hover,
#pgPrev:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.15);
}

#vdResume,
#vdRestart {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1d4ed8;
}

#vdReplay,
#vdBack {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
    color: #1f2937;
}

#vdReset {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5f5 100%);
    color: #1f2937;
}

#vdResume:hover,
#vdRestart:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(59, 130, 246, 0.25);
}

#vdReplay:hover,
#vdBack:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.15);
}

#vdReset:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.15);
}

.gap-result {
    min-height: 52px;
    border-radius: 14px;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    font-size: 1.05rem;
    font-weight: 600;
    margin-top: auto;
}

.correct {
    background: #c8f7c5;
}

.wrong {
    background: #f7c5c5;
}

.gap-result.correct {
    color: #0f5132;
}

.gap-result.wrong {
    color: #7f1d1d;
}

/* === added for training === */
.token {
    display: inline-block;
    border: 1px solid #888;
    padding: 4px 8px;
    margin: 4px;
    border-radius: 4px;
    cursor: pointer;
    background: #fff;
}


/* ==== Sentences (mobile-first) ========================================== */

/*      .sentences-screen ( .sentence-screen) */
.sentences-screen .card,
.sentence-screen .card,
.card-sentence {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    border-radius: 16px;
    padding: clamp(12px, 4vw, 18px);
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
}

/*   */
.sentences-screen .sentence-text,
.sentence-screen .sentence-text {
    font-size: clamp(1rem, 2.5vw + 0.6rem, 1.25rem);
    line-height: 1.45;
    margin: 6px 0 12px;
}

/* ,     */
.sentences-screen .drop-zone,
.sentence-screen .drop-zone {
    min-height: 56px;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    background: #fff;
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-bottom: 14px;
}

/*     */
.sentences-screen .tokens,
.sentence-screen .tokens {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin: 10px 0 14px;
    min-height: 44px;
}

/*   */
.sentences-screen .token,
.sentence-screen .token {
    font-size: 16px;
    /* >=16px,  iOS   */
    line-height: 1;
    padding: 10px 14px;
    border-radius: 9999px;
    background: #fff;
    border: 1px solid #cbd5e1;
    box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
    user-select: none;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: transform .05s ease;
}

.sentences-screen .token:active,
.sentence-screen .token:active {
    transform: scale(.98);
}

/*   */


/*    */

/*        */
.sentences-screen .card,
.card-sentence {
    max-width: 450px;
    width: 100%;
    margin: 12px auto 24px;
    border-radius: 16px;
    padding: clamp(14px, 4vw, 18px);
    box-shadow: 0 8px 18px rgba(15, 23, 42, .08);
}

/*    */
.sentences-screen .card h2 {
    margin: 4px 0 6px;
}

.sentences-screen .sentence-text {
    margin: 4px 0 10px;
}

/*    ,     */
.drop-zone {
    min-height: 56px;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    background: #fff;
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin: 8px 0 12px;
}

.drop-zone:empty::before {
    content: "Tap words to build the sentence";
    color: #94a3b8;
    font-size: 14px;
}

/*     ,      */
.tokens {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin: 8px 0 12px;
    max-height: 38vh;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

/* /    */
.token {
    font-size: 16px;
    /* >=16px,  iOS   */
    line-height: 1;
    padding: 10px 14px;
    border-radius: 9999px;
    border: 1px solid #cbd5e1;
    background: #fff;
    box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
    user-select: none;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: transform .05s ease;
}

.token:active {
    transform: scale(.98);
}

.token:focus-visible {
    outline: 3px solid rgba(59, 130, 246, .35);
}

/* Sticky-    */
/*     ,   */
.drop-zone.correct {
    background: #e8fbe9;
    border-color: #86efac;
}

.drop-zone.wrong {
    background: #ffe8e8;
    border-color: #fca5a5;
}

/* ================================================================
 * Responsive  —  Breakpoints
 *   ≤ 1100px  tablet      (iPad, landscape phone)
 *   ≤  768px  phone       (portrait / small landscape)
 *   ≤  480px  small phone (iPhone SE, narrow)
 * ================================================================ */

/* --- Tablet (≤ 1100px) --------------------------------------- */
@media (max-width: 1100px) {
    .card {
        max-width: 100%;
    }

    .columns {
        flex-wrap: wrap;
    }
}

/* --- Tablet landscape / desktop cards ------------------------- */
@media (min-width: 900px) {
    .sentences-screen .card,
    .sentence-screen .card,
    .card-sentence,
    .card-gap,
    .card-artikel {
        max-width: 780px;
    }
}

.footer-author {
    font-size: 0.75rem;
    color: #94a3b8;
    width: 100%;
    text-align: center;
}

.footer-author a {
    color: inherit;
    text-decoration: underline;
}

.footer-author a:hover {
    color: #64748b;
}

/* --- Phone (≤ 768px) ---------------------------------------- */
@media (max-width: 768px) {
    .columns {
        flex-direction: column;
    }

    .gaps-screen {
        border-radius: 16px;
    }

    .card-gap {
        min-height: auto;
    }

    header {
        position: sticky;
        top: 0;
        backdrop-filter: blur(6px);
        background: rgba(233, 237, 249, .85);
        padding: 10px 16px;
    }

    main#app {
        padding: 16px;
    }
}

/* --- Small phone (≤ 480px) ---------------------------------- */
@media (max-width: 480px) {
    body {
        background: #f2f4fd;
    }

    header {
        padding: 8px 12px;
    }

    main#app {
        padding: 12px;
    }

    /* Gaps exercise: full-bleed on small phones */
    main#app:has(> .gaps-screen) {
        padding: 0;
    }

    .gaps-screen {
        border-radius: 0;
        padding: 16px;
        box-shadow: none;
        background: linear-gradient(160deg, #f3f5ff 0%, #ffffff 100%);
    }

    .card {
        padding: 16px;
        max-width: 100%;
    }

    .card-gap {
        box-shadow: none;
    }

    .card-gap__sentence {
        font-size: 1.15rem;
    }

    #checkGap,
    #nextGapBtn,
    #pgNext {
        font-size: 1.15rem;
        padding: 14px;
    }
}

.levels {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 24px;
}

/* Level container */
.level details {
    background: #ffffff;
    border-radius: 18px;
    padding: 10px 14px 14px;
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.06);
}

/* Header of the level */
.level-summary {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 16px;
    cursor: pointer;
    list-style: none;
}

.level-summary::-webkit-details-marker {
    display: none;
}

.level-badge {
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.6);
    font-size: 0.9rem;
}

.level-title {
    font-weight: 600;
}

.level-hint {
    font-size: 0.9rem;
    color: #64748b;
}

/* Aggregate progress badges inside level / sublevel summaries */
.summary-progress {
    display: inline-flex;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
}

.summary-progress:empty {
    display: none;
}

.summary-progress .progress-badge {
    font-size: 0.72rem;
}

/* Attribution line under a level's cards */
.level-source {
    margin: 14px 0 0;
    color: #64748b;
    line-height: 1.5;
}

[data-theme="dark"] .level-source { color: #94a3b8; }

/* Subsection within a level (e.g. Shorts inside Video) */
.level-subgroup {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .level-subgroup { border-top-color: rgba(255, 255, 255, 0.08); }

.level-subgroup-title {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    opacity: 0.55;
    margin: 0 0 2px;
}

/* Grid of level cards */
.level-cards {
    margin-top: 14px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 12px;
}

/* Link around card */
.level-cards .card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

/* Basic card styles for small cards */
.card.small {
    padding: 10px 12px;
    border-radius: 14px;
    background: #f8fafc;
    border: 1px solid rgba(148, 163, 184, 0.35);
    transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

.card.small:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
    background: #ffffff;
}

/* Muted (disabled) card styles */
.card.small.muted {
    opacity: 0.7;
    cursor: default;
}

.card.small.muted:hover {
    transform: none;
    box-shadow: none;
    background: #f8fafc;
}


.sublevels {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sublevel details {
    background: #f8fafc;
    border-radius: 14px;
    padding: 8px 10px 10px;
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.04);
}

.sublevel-summary {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    cursor: pointer;
}

.sublevel-summary::-webkit-details-marker {
    display: none;
}

.sublevel-title {
    font-weight: 600;
}

.sublevel-hint {
    font-size: 0.85rem;
    color: #64748b;
}


/* === Artikel exercise === */

.card-artikel {
    max-width: 480px;
    width: 100%;
    text-align: center;
}

.artikel-noun {
    font-size: 2rem;
    font-weight: 700;
    margin: 20px 0 8px;
    color: #0f172a;
}

.artikel-translation {
    color: #64748b;
    font-size: 0.9rem;
    margin: 0 0 24px;
}

.artikel-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin: 16px 0;
}

.artikel-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    padding: 10px 28px 8px;
    border: 2px solid #cbd5e1;
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
    min-width: 80px;
}

.key-hint {
    display: none;
}

@media (hover: hover) and (pointer: fine) {
    .key-hint {
        display: block;
        font-size: 0.7rem;
        font-weight: 400;
        color: #94a3b8;
        margin-top: 2px;
    }
}

.artikel-btn:hover:not(:disabled) {
    background: #f1f5f9;
    border-color: #94a3b8;
}

.artikel-btn:disabled {
    cursor: default;
}

.artikel-btn.correct {
    background: #c8f7c5;
    border-color: #4ade80;
}

.artikel-btn.wrong {
    background: #f7c5c5;
    border-color: #f87171;
}

.artikel-nav {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 8px;
}

.artikel-nav button {
    width: 100%;
    box-sizing: border-box;
    font-size: 1.25rem;
    padding: 16px 18px;
    border-radius: 14px;
    font-weight: 700;
    letter-spacing: 0.02em;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

#prevArtikel {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
    color: #1f2937;
}

#prevArtikel:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.15);
}

#prevArtikel:disabled {
    opacity: 0.4;
    cursor: default;
}

/* === end Artikel exercise === */

#app-footer {
    text-align: center;
    padding: 12px;
    font-size: 0.75rem;
    color: #475569;
}

/* === Hint language toggles (EN / etc.) === */
.sentence-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.hint-toggles {
    display: flex;
    gap: 6px;
    align-items: center;
    margin-left: auto;
}

.drop-zone.speakable,
.pg-sentence.speakable,
.srs-word.speakable,
.srs-example-front.speakable {
    cursor: pointer;
}

.hint-toggle {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 9px;
    border-radius: 999px;
    border: 1px solid #cbd5e1;
    background: transparent;
    color: #94a3b8;
    cursor: pointer;
    letter-spacing: 0.05em;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    line-height: 1.6;
}

.hint-toggle.active {
    background: #e0f2fe;
    border-color: #7dd3fc;
    color: #0369a1;
}

.hint-toggle:hover {
    border-color: #7dd3fc;
    color: #0369a1;
}

[data-theme="dark"] .hint-toggle {
    border-color: #475569;
    color: #475569;
}

[data-theme="dark"] .hint-toggle.active {
    background: #0c2a3a;
    border-color: #0ea5e9;
    color: #7dd3fc;
}

[data-theme="dark"] .hint-toggle:hover {
    border-color: #0ea5e9;
    color: #7dd3fc;
}

/* === Tense navigation buttons === */
.tense-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 8px 0 4px;
}

.tense-btn {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 999px;
    border: 1px solid #cbd5e1;
    background: transparent;
    color: #64748b;
    cursor: pointer;
    letter-spacing: 0.03em;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    line-height: 1.6;
}

.tense-btn.active {
    background: #f0fdf4;
    border-color: #86efac;
    color: #16a34a;
    cursor: default;
}

.tense-btn:not(.active):hover {
    border-color: #7dd3fc;
    color: #0369a1;
}

[data-theme="dark"] .tense-btn {
    border-color: #475569;
    color: #475569;
}

[data-theme="dark"] .tense-btn.active {
    background: #052e16;
    border-color: #4ade80;
    color: #4ade80;
}

[data-theme="dark"] .tense-btn:not(.active):hover {
    border-color: #0ea5e9;
    color: #7dd3fc;
}

/* === Passiv Gap exercise === */

.pg-hint-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.pg-hint-row .k2-task-hint {
    margin: 0;
}

.pg-sentence {
    line-height: 2.2;
}

.pg-blank {
    display: inline-block;
    min-width: 3.5rem;
    padding: 2px 10px;
    border-bottom: 2px solid #94a3b8;
    border-radius: 4px 4px 0 0;
    background: #f1f5f9;
    color: #1e293b;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.15s, background 0.15s;
}

.pg-blank:hover {
    border-color: #60a5fa;
    background: #eff6ff;
}

.pg-blank.filled {
    border-color: #86efac;
    background: #f0fdf4;
    color: #16a34a;
}

.pg-blank.wrong {
    border-color: #fca5a5;
    background: #fff1f2;
    color: #b91c1c;
}

.pg-input.wrong {
    border-color: #fca5a5;
    background: #fff1f2;
    color: #b91c1c;
}

.pg-input {
    display: inline-block;
    width: 5rem;
    padding: 2px 6px;
    border: none;
    border-bottom: 2px solid #94a3b8;
    border-radius: 4px 4px 0 0;
    background: #f1f5f9;
    color: inherit;
    font-size: inherit;
    font-family: inherit;
    font-weight: 600;
    text-align: center;
    outline: none;
}

.pg-input:focus {
    border-color: #60a5fa;
    background: #eff6ff;
}

.pg-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0;
}

.pg-chip {
    padding: 6px 16px;
    border-radius: 999px;
    border: 1px solid #cbd5e1;
    background: #f8fafc;
    color: #334155;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.pg-chip:hover {
    border-color: #60a5fa;
    background: #eff6ff;
    color: #0369a1;
}

.pg-hint-reveal {
    margin: 8px 0 0;
    text-align: center;
}

.pg-hint-btn {
    background: none;
    border: none;
    color: #94a3b8;
    font-size: 0.82rem;
    cursor: pointer;
    padding: 2px 6px;
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.15s;
}

.pg-hint-btn:hover:not(:disabled) {
    color: #475569;
}

.pg-hint-btn:disabled {
    cursor: default;
    text-decoration: none;
    color: #b91c1c;
    font-weight: 600;
}

.pg-translation {
    margin-top: 12px;
    margin-bottom: 0;
    font-size: 0.85rem;
    color: #64748b;
    font-style: italic;
}

.pg-translation + .pg-translation {
    margin-top: 2px;
}

[data-theme="dark"] .pg-blank {
    background: #1e293b;
    color: #e2e8f0;
    border-color: #475569;
}

[data-theme="dark"] .pg-blank:hover {
    border-color: #60a5fa;
    background: #172554;
}

[data-theme="dark"] .pg-blank.filled {
    border-color: #4ade80;
    background: #052e16;
    color: #4ade80;
}

[data-theme="dark"] .pg-blank.wrong {
    border-color: #f87171;
    background: #3b0f0f;
    color: #f87171;
}

[data-theme="dark"] .pg-input.wrong {
    border-color: #f87171;
    background: #3b0f0f;
    color: #f87171;
}

[data-theme="dark"] .pg-input {
    background: #1e293b;
    border-color: #475569;
}

[data-theme="dark"] .pg-input:focus {
    border-color: #60a5fa;
    background: #172554;
}

[data-theme="dark"] .pg-chip {
    background: #1e293b;
    color: #94a3b8;
    border-color: #475569;
}

[data-theme="dark"] .pg-chip:hover {
    border-color: #60a5fa;
    background: #172554;
    color: #7dd3fc;
}

[data-theme="dark"] .pg-hint-btn {
    color: #475569;
}

[data-theme="dark"] .pg-hint-btn:hover:not(:disabled) {
    color: #94a3b8;
}

[data-theme="dark"] .pg-hint-btn:disabled {
    color: #f87171;
}

[data-theme="dark"] .pg-translation {
    color: #64748b;
}

/* === Theme toggle button === */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 4px 6px;
    border-radius: 6px;
    line-height: 1;
    color: inherit;
}

#theme-toggle:hover {
    background: rgba(0, 0, 0, 0.06);
}

/* === Tag group (collapsible sub-section inside card grid) === */
.tag-group {
    grid-column: 1 / -1;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    overflow: hidden;
}

.tag-group-summary {
    padding: 8px 14px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: #64748b;
    cursor: pointer;
    list-style: none;
    user-select: none;
}

.tag-group-summary::-webkit-details-marker { display: none; }

.tag-group-summary::before { content: "▸ "; }
.tag-group[open] .tag-group-summary::before { content: "▾ "; }

.tag-group-cards {
    padding: 4px 8px 8px;
    border-top: 1px solid #e2e8f0;
}

[data-theme="dark"] .tag-group {
    border-color: #1e293b;
}

[data-theme="dark"] .tag-group-cards {
    border-top-color: #1e293b;
}

/* === Dark mode overrides === */
[data-theme="dark"] body {
    background: #0f172a;
    color: #f1f5f9;
}

[data-theme="dark"] .card {
    background: #1e293b;
    border-color: #334155;
}

[data-theme="dark"] .home .card {
    border-color: #334155;
}

[data-theme="dark"] .sentences-screen .card,
[data-theme="dark"] .sentence-screen .card,
[data-theme="dark"] .card-sentence {
    background: #1e293b;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .card.small {
    background: #162032;
    border-color: rgba(51, 65, 85, 0.5);
}

[data-theme="dark"] .card.small:hover {
    background: #1e293b;
}

[data-theme="dark"] .card.small.muted:hover {
    background: #162032;
}

[data-theme="dark"] .level details {
    background: #1e293b;
}

[data-theme="dark"] .sublevel details {
    background: #162032;
}

[data-theme="dark"] .level-hint,
[data-theme="dark"] .sublevel-hint,
[data-theme="dark"] .lang-card p,
[data-theme="dark"] .lang-select .tagline,
[data-theme="dark"] .artikel-translation {
    color: #94a3b8;
}

[data-theme="dark"] .artikel-noun {
    color: #f1f5f9;
}

[data-theme="dark"] .token {
    background: #1e293b;
    border-color: #475569;
    color: #f1f5f9;
}

[data-theme="dark"] .drop-zone {
    background: #162032;
    border-color: #475569;
}

[data-theme="dark"] .drop-zone:empty::before {
    color: #64748b;
}

[data-theme="dark"] .drop-zone.correct {
    background: #0f3023;
    border-color: #4ade80;
}

[data-theme="dark"] .drop-zone.wrong {
    background: #3b0f0f;
    border-color: #f87171;
}

[data-theme="dark"] .correct {
    background: #0f3023;
}

[data-theme="dark"] .wrong {
    background: #3b0f0f;
}

[data-theme="dark"] .gap-result.correct {
    color: #4ade80;
}

[data-theme="dark"] .gap-result.wrong {
    color: #f87171;
}

[data-theme="dark"] .gaps-screen {
    background: radial-gradient(circle at top, #1a2535 0%, #162032 45%, #0f172a 100%);
    box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.08), 0 32px 60px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] #gapInput,
[data-theme="dark"] #prodInput {
    background: rgba(30, 41, 59, 0.9);
    color: #f1f5f9;
    border-color: rgba(99, 102, 241, 0.4);
}

[data-theme="dark"] #gapInput:focus,
[data-theme="dark"] #prodInput:focus {
    border-color: rgba(99, 102, 241, 0.7);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

[data-theme="dark"] .artikel-btn {
    background: #1e293b;
    border-color: #475569;
    color: #f1f5f9;
}

[data-theme="dark"] .artikel-btn:hover:not(:disabled) {
    background: #162032;
    border-color: #64748b;
}

[data-theme="dark"] .artikel-btn.correct {
    background: #0f3023;
    border-color: #4ade80;
}

[data-theme="dark"] .artikel-btn.wrong {
    background: #3b0f0f;
    border-color: #f87171;
}

[data-theme="dark"] #app-footer {
    color: #64748b;
}

[data-theme="dark"] #theme-toggle:hover {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] #checkGap,
[data-theme="dark"] #checkSentence {
    background: linear-gradient(135deg, #166534 0%, #065f46 100%);
}

[data-theme="dark"] #checkGap:hover,
[data-theme="dark"] #checkSentence:hover {
    box-shadow: 0 16px 32px rgba(22, 163, 74, 0.2);
}

@media (max-width: 768px) {
    [data-theme="dark"] header {
        background: rgba(15, 23, 42, 0.9);
    }
}

@media (max-width: 480px) {
    [data-theme="dark"] body {
        background: #0f172a;
    }

    [data-theme="dark"] main#app:has(> .gaps-screen) {
        padding: 0;
    }

    [data-theme="dark"] .gaps-screen {
        background: linear-gradient(160deg, #162032 0%, #0f172a 100%);
    }
}

/* === Footer language toggle === */
#app-footer {
    text-align: center;
    padding: 12px 16px 16px;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-privacy {
    font-size: 0.75rem;
    color: #94a3b8;
    text-decoration: none;
}

.footer-privacy:hover {
    text-decoration: underline;
}

.footer-version {
    font-size: 0.75rem;
    color: #94a3b8;
}


.privacy-page h3 {
    margin: 20px 0 8px;
}

.privacy-page p {
    margin: 0 0 8px;
    line-height: 1.6;
}

.privacy-date {
    font-size: 0.85rem;
    color: #94a3b8;
}

.lang-toggle {
    display: flex;
    gap: 4px;
}

.lang-btn {
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 10px;
    border: 1px solid #cbd5e1;
    border-radius: 20px;
    background: transparent;
    color: #64748b;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.lang-btn:hover {
    border-color: #2563eb;
    color: #2563eb;
}

.lang-btn.active {
    background: #2563eb;
    border-color: #2563eb;
    color: #ffffff;
}

[data-theme="dark"] .lang-btn {
    border-color: #334155;
    color: #64748b;
}

[data-theme="dark"] .lang-btn:hover {
    border-color: #60a5fa;
    color: #60a5fa;
}

[data-theme="dark"] .lang-btn.active {
    background: #2563eb;
    border-color: #2563eb;
    color: #ffffff;
}

[data-theme="dark"] .footer-version {
    color: #475569;
}

[data-theme="dark"] .footer-author {
    color: #475569;
}

[data-theme="dark"] .footer-author a:hover {
    color: #64748b;
}

/* === Breadcrumb === */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 2px;
    margin-bottom: 10px;
    font-size: 0.78rem;
}

.bc-link {
    color: #64748b;
    text-decoration: none;
}

.bc-link:hover {
    text-decoration: underline;
    color: #2563eb;
}

.bc-sep {
    color: #cbd5e1;
    user-select: none;
}

.bc-current {
    color: #94a3b8;
}

[data-theme="dark"] .bc-link {
    color: #94a3b8;
}

[data-theme="dark"] .bc-link:hover {
    color: #60a5fa;
}

[data-theme="dark"] .bc-sep {
    color: #334155;
}

[data-theme="dark"] .bc-current {
    color: #475569;
}

.card-progress {
    margin: 2px 0 4px;
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.progress-badge {
    display: inline-block;
    font-size: 0.7em;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 8px;
    vertical-align: middle;
}
.progress-badge.badge-green { background: #e0f2e9; color: #16a34a; }
.progress-badge.badge-yellow { background: #fef3c7; color: #b45309; }
.progress-badge.badge-red { background: #fee2e2; color: #dc2626; }
.progress-badge.badge-soon { background: #f1f5f9; color: #94a3b8; }
.progress-badge.badge-gray { background: #f1f5f9; color: #94a3b8; }

[data-theme="dark"] .progress-badge.badge-green { background: #1a3a2a; color: #4ade80; }
[data-theme="dark"] .progress-badge.badge-yellow { background: #3b2f0a; color: #fbbf24; }
[data-theme="dark"] .progress-badge.badge-red { background: #3b1212; color: #f87171; }
[data-theme="dark"] .progress-badge.badge-soon { background: #1e293b; color: #475569; }
[data-theme="dark"] .progress-badge.badge-gray { background: #1e293b; color: #475569; }

.item-stats {
    display: inline-block;
    font-size: 0.72em;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 8px;
}
.item-stats.badge-green { background: #e0f2e9; color: #16a34a; }
.item-stats.badge-yellow { background: #fef3c7; color: #b45309; }
.item-stats.badge-red { background: #fee2e2; color: #dc2626; }
.item-stats.badge-gray { background: #f1f5f9; color: #94a3b8; }
[data-theme="dark"] .item-stats.badge-green { background: #1a3a2a; color: #4ade80; }
[data-theme="dark"] .item-stats.badge-yellow { background: #3b2f0a; color: #fbbf24; }
[data-theme="dark"] .item-stats.badge-red { background: #3b1212; color: #f87171; }
[data-theme="dark"] .item-stats.badge-gray { background: #1e293b; color: #475569; }

.item-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 2px 0 4px;
}

.item-id {
    color: #94a3b8;
    font-family: monospace;
    font-size: 0.75em;
}

/* ── Daily Progress ────────────────────────────────────────────── */

.daily-progress {
    max-width: 480px;
    margin: 12px auto 20px;
}
.daily-bar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    font-size: 0.9em;
}
.daily-label {
    font-weight: 600;
    color: #334155;
}
.daily-streak {
    font-weight: 600;
    color: #f59e0b;
}
.daily-bar-track {
    height: 10px;
    background: #e2e8f0;
    border-radius: 5px;
    overflow: hidden;
}
.daily-bar-fill {
    height: 100%;
    background: #3b82f6;
    border-radius: 5px;
    transition: width 0.3s ease;
}
.daily-bar-fill.daily-bar-done {
    background: #16a34a;
}

[data-theme="dark"] .daily-label { color: #cbd5e1; }
[data-theme="dark"] .daily-streak { color: #fbbf24; }
[data-theme="dark"] .daily-bar-track { background: #334155; }
[data-theme="dark"] .daily-bar-fill { background: #60a5fa; }
[data-theme="dark"] .daily-bar-fill.daily-bar-done { background: #4ade80; }

/* ── Hören ──────────────────────────────────────────────────────── */

.hoeren-screen .card,
.card-hoeren {
    width: 100%;
    max-width: 450px;
    margin: 12px auto 24px;
    border-radius: 16px;
}

.hoeren-screen .card h2 {
    margin: 4px 0 6px;
}

.hoeren-play {
    text-align: center;
    margin: 12px 0;
}

.play-btn {
    font-size: 1.1rem;
    padding: 10px 24px;
    border-radius: 12px;
    border: 2px solid #6366f1;
    background: #eef2ff;
    color: #4338ca;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
}

.play-btn:hover {
    background: #e0e7ff;
}

.play-btn:active {
    transform: scale(0.97);
}

.hoeren-mode-toggle,
.k2-mode-toggle {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin: 8px 0 12px;
}

.mode-btn {
    padding: 6px 16px;
    border: 1px solid #cbd5e1;
    background: #f8fafc;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.15s;
}

.mode-btn.active {
    background: #6366f1;
    color: #fff;
    border-color: #6366f1;
}

.hoeren-input {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 2px solid #cbd5e1;
    border-radius: 10px;
    outline: none;
    transition: border-color 0.15s;
}

.hoeren-input:focus {
    border-color: #6366f1;
}

.hoeren-no-tts {
    text-align: center;
    color: #b45309;
    font-size: 0.9rem;
    margin: 8px 0;
}

.hoeren-screen .drop-zone,
.hoeren-screen .tokens,
.hoeren-screen .token {
    /* inherit sentence styles */
}

/* dark mode */
[data-theme="dark"] .card-hoeren {
    background: #1e293b;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .play-btn {
    background: #312e81;
    color: #c7d2fe;
    border-color: #6366f1;
}

[data-theme="dark"] .play-btn:hover {
    background: #3730a3;
}

[data-theme="dark"] .mode-btn {
    background: #1e293b;
    color: #cbd5e1;
    border-color: #475569;
}

[data-theme="dark"] .mode-btn.active {
    background: #6366f1;
    color: #fff;
    border-color: #6366f1;
}

[data-theme="dark"] .hoeren-input {
    background: #0f172a;
    color: #e2e8f0;
    border-color: #475569;
}

[data-theme="dark"] .hoeren-input:focus {
    border-color: #6366f1;
}

[data-theme="dark"] .hoeren-no-tts {
    color: #fbbf24;
}

@media (min-width: 700px) {
    .hoeren-screen .card,
    .card-hoeren {
        max-width: 780px;
    }
}

/* Video dictation */
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    margin-bottom: 1rem;
    border-radius: 8px;
    overflow: hidden;
    background: #000;
}

.video-container.portrait {
    width: min(100%, 360px);
    max-width: 360px;
    aspect-ratio: 9 / 16;
    padding-bottom: 0;
    margin-left: auto;
    margin-right: auto;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.video-dict-title {
    font-weight: 600;
    margin: 0.25rem 0 0.5rem;
}

.segment-counter {
    font-size: 0.85rem;
    color: var(--text-muted, #64748b);
    margin: 0.5rem 0;
}

.video-dict-card {
    max-width: 720px;
}

#vdSegmentUI {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.segment-translation {
    color: var(--text-muted, #64748b);
    font-size: 0.9rem;
    font-style: italic;
    margin: 0.25rem 0 0;
}

.vd-translation-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 0.5rem;
}

/* ── SRS flip cards ─────────────────────────────────────────────── */

.srs-count {
    font-size: 0.8rem;
    color: #94a3b8;
    text-align: right;
    margin-bottom: 6px;
}

.srs-word {
    font-size: 1.8rem;
    margin: 8px 0 12px;
    line-height: 1.2;
}

.srs-article {
    color: #94a3b8;
    font-size: 1.4rem;
}

.srs-translation {
    font-size: 1.2rem;
    color: #16a34a;
    margin: 6px 0 10px;
    font-weight: 600;
}

.srs-example-front {
    color: #64748b;
    font-size: 0.95rem;
    margin: 0 0 12px;
}

.srs-example {
    color: #475569;
    font-size: 0.9rem;
    margin: 4px 0;
}

.srs-example-tr {
    color: #94a3b8;
    font-size: 0.85rem;
    margin: 2px 0 10px;
}

.srs-controls {
    margin-top: 16px;
}

.srs-controls button {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 14px;
    font-size: 1.1rem;
    font-weight: 700;
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1d4ed8;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.srs-controls button:hover,
.srs-done-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.25);
}

/* Two-button self-assessment (recall exercises) */
.srs-controls.srs-self {
    display: flex;
    gap: 12px;
}

.srs-controls.srs-self button {
    flex: 1 1 0;
}

.srs-controls.srs-self .self-again {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #dc2626;
}

.srs-controls.srs-self .self-good {
    background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
    color: #16a34a;
}

[data-theme="dark"] .srs-controls.srs-self .self-again {
    background: linear-gradient(135deg, #3b1212 0%, #4c1d1d 100%);
    color: #f87171;
}

[data-theme="dark"] .srs-controls.srs-self .self-good {
    background: linear-gradient(135deg, #14351f 0%, #14532d 100%);
    color: #4ade80;
}

.srs-done-link {
    display: block;
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 14px;
    font-size: 1.1rem;
    font-weight: 700;
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1d4ed8;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-sizing: border-box;
}

/* Standalone word card: two stacked ways into the deck, so a shared link is
   not a dead end. The second one is quieter — it is the fallback, not the
   thing we want the visitor to do. */
.srs-controls .srs-done-link + .srs-done-link {
    margin-top: 10px;
}

.srs-done-link-secondary {
    background: none;
    border: 1px solid #cbd5e1;
    color: #475569;
    font-weight: 600;
    font-size: 1rem;
}

/* Share control on a card. Quiet by design — it sits next to the dictionary
   links and must not compete with the answer or the Next button. */
.srs-share {
    margin: 14px 0 0;
    text-align: center;
}

.srs-share-btn {
    display: inline-block;
    padding: 7px 14px;
    border: 1px solid #cbd5e1;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #475569;
    background: #f8fafc;
    text-decoration: none;
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease;
}

.srs-share-btn:hover {
    border-color: #93c5fd;
    color: #1d4ed8;
}

.srs-share-btn.srs-share-done {
    border-color: #16a34a;
    color: #16a34a;
}

[data-theme="dark"] .srs-share-btn {
    background: #1e293b;
    border-color: #334155;
    color: #94a3b8;
}

[data-theme="dark"] .srs-share-btn.srs-share-done {
    border-color: #16a34a;
    color: #4ade80;
}

.srs-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
}

.srs-option {
    padding: 13px 14px;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    background: #f8fafc;
    color: #0f172a;
    font-size: 1rem;
    text-align: left;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.srs-option:hover:not(:disabled) {
    transform: translateY(-1px);
    border-color: #93c5fd;
}

.srs-option:disabled {
    cursor: default;
    opacity: 0.75;
}

.srs-option.srs-option-correct {
    background: #dcfce7;
    border-color: #16a34a;
    color: #16a34a;
    font-weight: 700;
    opacity: 1;
}

.srs-option.srs-option-wrong {
    background: #fee2e2;
    border-color: #dc2626;
    color: #dc2626;
    font-weight: 700;
    opacity: 1;
}

/* SRS badge on home page */
.progress-badge.badge-blue { background: #dbeafe; color: #1d4ed8; }

[data-theme="dark"] .srs-count        { color: #475569; }
[data-theme="dark"] .srs-translation  { color: #4ade80; }
[data-theme="dark"] .srs-example      { color: #94a3b8; }
[data-theme="dark"] .srs-example-front { color: #64748b; }
[data-theme="dark"] .srs-example-tr   { color: #475569; }
[data-theme="dark"] .srs-article      { color: #475569; }
[data-theme="dark"] .srs-controls button,
[data-theme="dark"] .srs-done-link {
    background: linear-gradient(135deg, #1e3a5f 0%, #1e3a8a 100%);
    color: #93c5fd;
}
[data-theme="dark"] .srs-done-link-secondary {
    background: none;
    border-color: #334155;
    color: #94a3b8;
}
[data-theme="dark"] .srs-option {
    background: #1e293b;
    border-color: #334155;
    color: #e2e8f0;
}
[data-theme="dark"] .srs-option:hover:not(:disabled) { border-color: #3b82f6; }
[data-theme="dark"] .srs-option.srs-option-correct {
    background: #1a3a2a;
    border-color: #16a34a;
    color: #4ade80;
}
[data-theme="dark"] .srs-option.srs-option-wrong {
    background: #3b1212;
    border-color: #dc2626;
    color: #f87171;
}
[data-theme="dark"] .progress-badge.badge-blue { background: #1e3a5f; color: #93c5fd; }

/* === vocabulary level test === */
.level-test-link {
    display: block;
    margin: 0 0 18px;
}

.level-test-card {
    border: 2px solid rgba(99, 102, 241, 0.35);
}

.lt-pick {
    margin: 0 0 10px;
    color: #6b7280;
}

.lt-result-level {
    font-size: 2.4rem;
    font-weight: 700;
    margin: 4px 0 16px;
}

.lt-rows {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 18px;
}

.lt-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lt-bar {
    flex: 1;
}

.lt-score {
    min-width: 44px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

[data-theme="dark"] .level-test-card {
    border-color: rgba(129, 140, 248, 0.45);
}

[data-theme="dark"] .lt-pick {
    color: #9ca3af;
}

/* === Telegram channel card === */
.tg-card {
    display: flex;
    align-items: center;
    gap: 18px;
    max-width: 420px;
    width: 100%;
    margin: 28px auto 8px;
    padding: 16px 18px;
    border: 1px solid #cfe8f7;
    border-radius: 16px;
    background: #f2fafe;
    color: inherit;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tg-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(34, 158, 217, 0.18);
}

.tg-qr {
    flex: 0 0 auto;
    width: 112px;
    height: 112px;
    border-radius: 8px;
    /* The QR itself is black on white, so it keeps its own background in dark mode. */
    background: #fff;
    padding: 4px;
}

.tg-text {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

.tg-title {
    font-weight: 600;
    font-size: 1.02rem;
}

.tg-desc {
    font-size: 0.88rem;
    line-height: 1.4;
    color: #4b5563;
}

.tg-handle {
    font-size: 0.88rem;
    font-weight: 600;
    color: #1d87ba;
    word-break: break-all;
}

[data-theme="dark"] .tg-card {
    background: #12263a;
    border-color: #1e4560;
}

[data-theme="dark"] .tg-desc {
    color: #94a3b8;
}

[data-theme="dark"] .tg-handle {
    color: #7dd3fc;
}

@media (max-width: 420px) {
    .tg-card {
        gap: 14px;
        padding: 14px;
    }

    .tg-qr {
        width: 88px;
        height: 88px;
    }
}

/* === missing German TTS voice warning === */
.tts-warn {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
    border-radius: 12px;
    padding: 10px 14px;
    margin: 10px 0;
    font-size: 0.92rem;
    line-height: 1.45;
}

.tts-warn button {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    font-size: 1.1rem;
    line-height: 1;
    cursor: pointer;
    padding: 2px 4px;
}

[data-theme="dark"] .tts-warn {
    background: #3b2f0f;
    color: #fcd34d;
    border-color: #92400e;
}

/* ── Install (PWA) banner ──────────────────────────────────────── */

.install-banner {
    position: fixed;
    left: 50%;
    bottom: 16px;
    transform: translateX(-50%);
    z-index: 1000;
    width: min(560px, calc(100% - 24px));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 16px;
    background: #ffffff;
    color: #0f172a;
    border: 1px solid #e5e7f3;
    border-radius: 14px;
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.22);
    animation: install-slide-up 0.25s ease;
}

@keyframes install-slide-up {
    from { opacity: 0; transform: translate(-50%, 12px); }
    to   { opacity: 1; transform: translate(-50%, 0); }
}

.install-text {
    font-size: 0.9rem;
    line-height: 1.4;
}

.install-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.install-accept {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #ffffff;
    border: none;
    border-radius: 10px;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
}

.install-accept:hover {
    filter: brightness(1.05);
}

.install-dismiss {
    background: none;
    border: none;
    color: #64748b;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 8px 6px;
    white-space: nowrap;
}

.install-dismiss:hover {
    color: #0f172a;
}

[data-theme="dark"] .install-banner {
    background: #1e293b;
    color: #e2e8f0;
    border-color: #334155;
}

[data-theme="dark"] .install-dismiss {
    color: #94a3b8;
}

[data-theme="dark"] .install-dismiss:hover {
    color: #e2e8f0;
}

/* ── SRS learn-session action buttons ──────────────────────────── */

.srs-learn-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* Next stays the full-width primary action (keeps the blue .srs-controls look). */
.srs-learn-actions #srsNext {
    flex: 1 1 100%;
}

/* Learned / Difficult sit on the row below, monochrome and quieter. */
.srs-learn-actions .srs-mark {
    flex: 1 1 0;
    min-width: 90px;
    padding: 12px 10px;
    font-size: 0.95rem;
    background: #f1f5f9;
    color: #475569;
    border: 1px solid #e2e8f0;
}

.srs-learn-actions .srs-mark:hover {
    background: #e2e8f0;
}

[data-theme="dark"] .srs-learn-actions .srs-mark {
    background: #1e293b;
    color: #94a3b8;
    border-color: #334155;
}

[data-theme="dark"] .srs-learn-actions .srs-mark:hover {
    background: #334155;
}

/* ── Word links: DWDS / Reverso / Linguee (+ conjugation) ───────── */

.srs-collocations {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 4px 10px;
    margin: 10px 0 0;
    font-size: 0.85rem;
}

.srs-collocations-label {
    color: #94a3b8;
}

.srs-collocations a {
    color: #64748b;
    text-decoration: none;
    border-bottom: 1px dotted currentColor;
}

.srs-collocations a:hover {
    color: #1d4ed8;
}

[data-theme="dark"] .srs-collocations-label {
    color: #475569;
}

[data-theme="dark"] .srs-collocations a {
    color: #94a3b8;
}

[data-theme="dark"] .srs-collocations a:hover {
    color: #93c5fd;
}

/* ── SRS "More" expander (extra examples + word family) ────────── */

.srs-more-btn {
    display: block;
    margin: 10px 0 4px;
    padding: 8px 12px;
    background: none;
    border: 1px dashed #cbd5e1;
    border-radius: 10px;
    color: #64748b;
    font-size: 0.85rem;
    cursor: pointer;
}

.srs-more-btn:hover {
    border-color: #94a3b8;
    color: #334155;
}

.srs-family-title {
    margin: 10px 0 4px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #94a3b8;
}

.srs-family {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.95rem;
}

.srs-family li {
    padding: 3px 0;
}

.srs-family-de {
    font-weight: 600;
    cursor: pointer;
}

.srs-family-de:hover {
    text-decoration: underline;
}

[data-theme="dark"] .srs-more-btn {
    border-color: #334155;
    color: #94a3b8;
}

[data-theme="dark"] .srs-more-btn:hover {
    border-color: #475569;
    color: #e2e8f0;
}

[data-theme="dark"] .srs-family-title {
    color: #475569;
}

.srs-family-ex {
    margin: 2px 0 6px;
    padding-left: 12px;
    border-left: 2px solid #e2e8f0;
    font-size: 0.88rem;
    color: #475569;
}

.srs-family-ex .speakable {
    cursor: pointer;
}

.srs-family-ex small {
    color: #94a3b8;
}

[data-theme="dark"] .srs-family-ex {
    border-left-color: #334155;
    color: #94a3b8;
}

[data-theme="dark"] .srs-family-ex small {
    color: #64748b;
}

/* ── Word detail: synonyms / antonyms ──────────────────────────── */

.srs-rel {
    list-style: none;
    margin: 4px 0 10px;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.srs-rel li {
    display: inline-flex;
    align-items: baseline;
    gap: 5px;
    padding: 4px 9px;
    border-radius: 999px;
    border: 1px solid transparent;
    font-size: 0.9rem;
    line-height: 1.3;
}

.srs-rel .srs-rel-de {
    font-weight: 600;
    cursor: pointer;
}

.srs-rel small {
    opacity: 0.75;
    font-size: 0.82rem;
}

.srs-rel.srs-syn li {
    background: #eef6ff;
    border-color: #dbeafe;
    color: #1e3a8a;
}

.srs-rel.srs-ant li {
    background: #fdf2f2;
    border-color: #fee2e2;
    color: #9b1c1c;
}

[data-theme="dark"] .srs-rel.srs-syn li {
    background: #16263f;
    border-color: #1e3a5f;
    color: #bfdbfe;
}

[data-theme="dark"] .srs-rel.srs-ant li {
    background: #331717;
    border-color: #4a1d1d;
    color: #fecaca;
}

/* ── Word detail: Wendungen (set phrases) ──────────────────────── */

.srs-wendungen {
    list-style: none;
    margin: 4px 0 10px;
    padding: 0;
    font-size: 0.95rem;
}

.srs-wendungen li {
    padding: 3px 0 3px 12px;
    border-left: 2px solid #ede9fe;
    margin-bottom: 3px;
    color: #475569;
}

.srs-wendungen .srs-wendung-de {
    font-weight: 600;
    color: #5b21b6;
    cursor: pointer;
}

.srs-wendungen .srs-wendung-de:hover {
    text-decoration: underline;
}

[data-theme="dark"] .srs-wendungen li {
    border-left-color: #3b2f5e;
    color: #94a3b8;
}

[data-theme="dark"] .srs-wendungen .srs-wendung-de {
    color: #c4b5fd;
}

/* ===== Kasus: Akkusativ / Dativ ===== */

.kasus-sentence {
    margin: 14px 0 10px;
}

.kasus-focus {
    background: #fef3c7;
    border-bottom: 2px solid #f59e0b;
    border-radius: 3px;
    padding: 0 3px;
}

.kasus-blank {
    display: inline-block;
    min-width: 3.2em;
    text-align: center;
    border-bottom: 2px solid #94a3b8;
    color: #94a3b8;
}

.kasus-blank.filled {
    color: #15803d;
    font-weight: 600;
    border-bottom-color: #4ade80;
}

.kasus-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin: 16px 0 4px;
}

.kasus-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    font-size: 1.05rem;
    font-weight: 600;
    padding: 10px 22px 8px;
    border: 2px solid #cbd5e1;
    border-radius: 8px;
    background: #fff;
    color: #334155;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
    min-width: 72px;
}

.kasus-btn:hover:not(:disabled) {
    background: #f1f5f9;
    border-color: #94a3b8;
}

.kasus-btn:disabled {
    cursor: default;
}

.kasus-btn.correct {
    background: #c8f7c5;
    border-color: #4ade80;
}

.kasus-btn.wrong {
    background: #f7c5c5;
    border-color: #f87171;
}

.kasus-explain {
    margin: 6px 0 12px;
    padding: 10px 12px;
    border-left: 3px solid #6366f1;
    background: #f8fafc;
    border-radius: 0 8px 8px 0;
}

.kasus-rule {
    margin: 0;
    font-size: 0.9rem;
    color: #334155;
}

.kasus-translation {
    margin: 6px 0 0;
    color: #64748b;
}

[data-theme="dark"] .kasus-focus {
    background: #78350f;
    border-bottom-color: #fbbf24;
    color: #fef3c7;
}

[data-theme="dark"] .kasus-blank {
    border-bottom-color: #64748b;
    color: #64748b;
}

[data-theme="dark"] .kasus-blank.filled {
    color: #86efac;
    border-bottom-color: #4ade80;
}

[data-theme="dark"] .kasus-btn {
    background: #1e293b;
    border-color: #475569;
    color: #e2e8f0;
}

[data-theme="dark"] .kasus-btn:hover:not(:disabled) {
    background: #334155;
    border-color: #64748b;
}

[data-theme="dark"] .kasus-btn.correct {
    background: #14532d;
    border-color: #4ade80;
}

[data-theme="dark"] .kasus-btn.wrong {
    background: #7f1d1d;
    border-color: #f87171;
}

[data-theme="dark"] .kasus-explain {
    background: #1e293b;
    border-left-color: #818cf8;
}

[data-theme="dark"] .kasus-rule {
    color: #cbd5e1;
}

[data-theme="dark"] .kasus-translation {
    color: #94a3b8;
}

/* Kasus: per-task explanation and the rule popup */

.kasus-why {
    margin: 0;
    font-size: 0.92rem;
    line-height: 1.5;
    color: #1e293b;
}

.kasus-rule-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin: 10px 0 0;
}

.kasus-rule-summary {
    flex: 1 1 12rem;
    font-size: 0.82rem;
    color: #64748b;
}

.kasus-rule-btn {
    padding: 4px 14px;
    border: 1px solid #6366f1;
    border-radius: 999px;
    background: #eef2ff;
    color: #4338ca;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

.kasus-rule-btn:hover {
    background: #e0e7ff;
}

.kasus-dialog {
    width: min(560px, calc(100vw - 32px));
    max-height: min(80vh, 720px);
    padding: 0;
    border: none;
    border-radius: 14px;
    background: #fff;
    color: #1e293b;
    box-shadow: 0 20px 50px rgba(15, 23, 42, 0.28);
    overflow: hidden;
}

.kasus-dialog::backdrop {
    background: rgba(15, 23, 42, 0.5);
}

.kasus-dialog__head {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 18px 10px;
    border-bottom: 1px solid #e2e8f0;
}

.kasus-dialog__head h3 {
    margin: 0;
    font-size: 1.02rem;
    line-height: 1.35;
    flex: 1;
}

.kasus-dialog__close {
    border: none;
    background: none;
    font-size: 1.5rem;
    line-height: 1;
    color: #94a3b8;
    cursor: pointer;
    padding: 0 4px;
}

.kasus-dialog__close:hover {
    color: #475569;
}

.kasus-dialog__body {
    padding: 14px 18px;
    overflow-y: auto;
    max-height: calc(80vh - 130px);
}

.kasus-dialog__body p {
    margin: 0 0 10px;
    font-size: 0.9rem;
    line-height: 1.55;
}

.kasus-dialog__foot {
    padding: 10px 18px 16px;
    border-top: 1px solid #e2e8f0;
}

.kasus-dialog__foot button {
    width: 100%;
    padding: 9px;
    border: none;
    border-radius: 9px;
    background: #6366f1;
    color: #fff;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
}

.kasus-table-wrap {
    overflow-x: auto;
    margin: 4px 0 14px;
}

.kasus-table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.82rem;
}

.kasus-table th,
.kasus-table td {
    padding: 6px 9px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
    white-space: nowrap;
}

.kasus-table th {
    color: #64748b;
    font-weight: 600;
}

.kasus-table tr.hit {
    background: #eef2ff;
}

.kasus-examples {
    margin: 0;
    padding: 0;
    list-style: none;
}

.kasus-examples li {
    padding: 7px 0;
    border-top: 1px solid #e2e8f0;
    font-size: 0.86rem;
}

.kasus-ex-de {
    display: block;
    font-weight: 600;
}

.kasus-ex-tr {
    display: block;
    color: #64748b;
}

[data-theme="dark"] .kasus-why {
    color: #e2e8f0;
}

[data-theme="dark"] .kasus-rule-summary,
[data-theme="dark"] .kasus-ex-tr,
[data-theme="dark"] .kasus-table th {
    color: #94a3b8;
}

[data-theme="dark"] .kasus-rule-btn {
    background: #312e81;
    border-color: #818cf8;
    color: #c7d2fe;
}

[data-theme="dark"] .kasus-rule-btn:hover {
    background: #3730a3;
}

[data-theme="dark"] .kasus-dialog {
    background: #0f172a;
    color: #e2e8f0;
}

[data-theme="dark"] .kasus-dialog__head,
[data-theme="dark"] .kasus-dialog__foot {
    border-color: #334155;
}

[data-theme="dark"] .kasus-table th,
[data-theme="dark"] .kasus-table td,
[data-theme="dark"] .kasus-examples li {
    border-color: #334155;
}

[data-theme="dark"] .kasus-table tr.hit {
    background: #312e81;
}