/* ===== Tutorial Handbook — Sidebar + Chapter Layout ===== */

/* Override screen container defaults for full-width handbook */
#screen-tutorial {
    padding: 0 !important;
    max-width: none !important;
}

/* ===== Handbook Container ===== */

.tutorial-handbook {
    display: flex;
    min-height: calc(100vh - 56px);
}

/* ===== Sidebar ===== */

.tutorial-sidebar {
    width: 260px;
    flex-shrink: 0;
    position: sticky;
    top: 56px;
    height: calc(100vh - 56px);
    overflow-y: auto;
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.tutorial-sidebar__header {
    padding: 1.25rem 1rem 0.75rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.tutorial-sidebar__title {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.3;
}

.tutorial-sidebar__close-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.125rem;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.25rem;
}

.tutorial-sidebar__close-btn:hover {
    color: var(--gray-700);
}

.tutorial-sidebar__nav {
    flex: 1;
    padding: 0.5rem 0;
    overflow-y: auto;
}

.tutorial-sidebar__chapter {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    width: 100%;
    padding: 0.625rem 1rem;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 0.875rem;
    color: var(--gray-600);
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.tutorial-sidebar__chapter:hover {
    background: var(--gray-50);
    color: var(--gray-900);
}

.tutorial-sidebar__chapter--active {
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 600;
    border-left-color: var(--primary);
}

.tutorial-sidebar__icon {
    width: 1.25rem;
    text-align: center;
    font-size: 0.8125rem;
    flex-shrink: 0;
}

.tutorial-sidebar__label {
    line-height: 1.3;
}

/* ===== Sidebar Backdrop (Mobile) ===== */

.tutorial-sidebar__backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--modal-overlay);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.tutorial-sidebar__backdrop--visible {
    opacity: 1;
    pointer-events: auto;
}

/* ===== Content Area ===== */

.tutorial-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    height: calc(100vh - 56px);
    position: sticky;
    top: 56px;
}

.tutorial-content__header {
    display: none;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--gray-200);
    background: var(--white);
    position: sticky;
    top: 0;
    z-index: 10;
}

.tutorial-content__hamburger {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--gray-600);
    cursor: pointer;
    padding: 0.25rem;
}

.tutorial-content__hamburger:hover {
    color: var(--gray-900);
}

.tutorial-content__chapter-title {
    flex: 1;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tutorial-content__close {
    background: none;
    border: none;
    font-size: 1.125rem;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.25rem;
}

.tutorial-content__close:hover {
    color: var(--gray-700);
}

.tutorial-content__body {
    max-width: 720px;
    margin: 0 auto;
    padding: 1.5rem 1.5rem 3rem;
    width: 100%;
}

/* ===== Chapter Title ===== */

.tutorial-chapter__title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.tutorial-chapter__title i {
    color: var(--primary);
    font-size: 1.25rem;
}

/* ===== Section (formerly Slide) ===== */

.tutorial-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
}

.tutorial-section:first-of-type {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.tutorial-section__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.tutorial-section__body {
    font-size: 1rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.tutorial-section__body strong {
    color: var(--gray-800);
    font-weight: 600;
}

/* ===== Highlights (character examples with TTS) ===== */

.tutorial-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.tutorial-highlight {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-highlight:hover {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.tutorial-highlight__hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--gray-900);
}

.tutorial-highlight__info {
    font-size: 0.8125rem;
    color: var(--gray-500);
    line-height: 1.3;
}

.tutorial-highlight__pinyin {
    color: var(--primary);
    font-weight: 500;
}

.tutorial-highlight__tts {
    color: var(--gray-400);
    font-size: 0.875rem;
    margin-left: auto;
}

/* ===== Example Cards Grid ===== */

.tutorial-examples {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.tutorial-example-card {
    text-align: center;
    padding: 1rem 0.75rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-example-card:hover {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.tutorial-example-card__hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 2.25rem;
    font-weight: 500;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.tutorial-example-card__pinyin {
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 0.125rem;
}

.tutorial-example-card__german {
    font-size: 0.8125rem;
    color: var(--gray-700);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.tutorial-example-card__desc {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.tutorial-example-card__label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.25rem;
}

/* ===== Tone Cards ===== */

.tutorial-tones {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.tutorial-tone-card {
    text-align: center;
    padding: 1rem;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-tone-card:hover {
    border-color: var(--primary-light);
}

.tutorial-tone-card--1 { border-color: var(--tone-1); }
.tutorial-tone-card--2 { border-color: var(--tone-2); }
.tutorial-tone-card--3 { border-color: var(--tone-3); }
.tutorial-tone-card--4 { border-color: var(--tone-4); }

.tutorial-tone-card svg {
    display: block;
    margin: 0 auto 0.5rem;
}

.tutorial-tone-card__label {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.125rem;
}

.tutorial-tone-card--1 .tutorial-tone-card__label { color: var(--tone-1); }
.tutorial-tone-card--2 .tutorial-tone-card__label { color: var(--tone-2); }
.tutorial-tone-card--3 .tutorial-tone-card__label { color: var(--tone-3); }
.tutorial-tone-card--4 .tutorial-tone-card__label { color: var(--tone-4); }

.tutorial-tone-card__name {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-bottom: 0.375rem;
}

.tutorial-tone-card__desc {
    font-size: 0.75rem;
    color: var(--gray-500);
    line-height: 1.3;
    margin-bottom: 0.5rem;
}

.tutorial-tone-card__example {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    background: var(--gray-50);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
}

.tutorial-tone-card__example-hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--gray-900);
}

.tutorial-tone-card__example-text {
    color: var(--gray-600);
}

/* ===== Pinyin Table ===== */

.tutorial-pinyin-group {
    margin-bottom: 1.25rem;
}

.tutorial-pinyin-group__label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--gray-200);
}

.tutorial-pinyin-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-pinyin-row:hover {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.tutorial-pinyin-row__sound {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary);
    min-width: 2.5rem;
}

.tutorial-pinyin-row__approx {
    flex: 1;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.tutorial-pinyin-row__example {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.125rem;
    color: var(--gray-900);
}

.tutorial-pinyin-row__tts {
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* ===== Breakdown (equation style) ===== */

.tutorial-breakdowns {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tutorial-breakdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
}

.tutorial-breakdown__part {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 2rem;
    font-weight: 500;
    color: var(--gray-700);
    padding: 0.25rem 0.5rem;
    background: var(--gray-100);
    border-radius: var(--radius);
}

.tutorial-breakdown__op {
    font-size: 1.5rem;
    color: var(--gray-400);
    font-weight: 300;
}

.tutorial-breakdown__result {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    background: var(--primary-bg);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-breakdown__result:hover {
    background: var(--primary);
    color: var(--on-primary);
}

.tutorial-breakdown__info {
    width: 100%;
    text-align: center;
    margin-top: 0.25rem;
}

.tutorial-breakdown__pinyin {
    font-size: 0.9375rem;
    color: var(--primary);
    font-weight: 500;
}

.tutorial-breakdown__german {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-left: 0.5rem;
}

.tutorial-breakdown__logic {
    font-size: 0.8125rem;
    color: var(--gray-500);
    font-style: italic;
    display: block;
    margin-top: 0.125rem;
}

/* ===== Compounds ===== */

.tutorial-compounds {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tutorial-compound {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 1rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
}

.tutorial-compound__char {
    text-align: center;
    padding: 0.375rem 0.5rem;
    background: var(--gray-100);
    border-radius: var(--radius);
}

.tutorial-compound__char-hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.75rem;
    font-weight: 500;
    color: var(--gray-800);
    line-height: 1.2;
}

.tutorial-compound__char-german {
    font-size: 0.6875rem;
    color: var(--gray-500);
}

.tutorial-compound__op {
    font-size: 1.25rem;
    color: var(--gray-400);
    font-weight: 300;
}

.tutorial-compound__result {
    text-align: center;
    padding: 0.375rem 0.75rem;
    background: var(--primary-bg);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-compound__result:hover {
    background: var(--primary);
}

.tutorial-compound__result:hover .tutorial-compound__result-hanzi,
.tutorial-compound__result:hover .tutorial-compound__result-german {
    color: var(--on-primary);
}

.tutorial-compound__result-hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
}

.tutorial-compound__result-pinyin {
    font-size: 0.75rem;
    color: var(--primary);
}

.tutorial-compound__result-german {
    font-size: 0.6875rem;
    color: var(--gray-700);
}

.tutorial-compound__logic {
    width: 100%;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--gray-500);
    font-style: italic;
    margin-top: 0.25rem;
}

/* ===== Sentences ===== */

.tutorial-sentences {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tutorial-sentence {
    padding: 1rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.tutorial-sentence__chinese {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: 0.25rem;
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-sentence__chinese:hover {
    color: var(--primary);
}

.tutorial-sentence__pinyin {
    font-size: 0.9375rem;
    color: var(--primary);
    text-align: center;
    margin-bottom: 0.25rem;
}

.tutorial-sentence__german {
    font-size: 0.9375rem;
    color: var(--gray-600);
    text-align: center;
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--gray-200);
}

.tutorial-sentence__words {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tutorial-sentence__word {
    text-align: center;
    padding: 0.25rem 0.5rem;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.tutorial-sentence__word-hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.125rem;
    color: var(--gray-800);
}

.tutorial-sentence__word-meaning {
    font-size: 0.6875rem;
    color: var(--gray-500);
}

/* ===== Tone Quiz ===== */

.tutorial-quiz {
    text-align: center;
    margin-bottom: 1.5rem;
}

.tutorial-quiz__prompt {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 4rem;
    font-weight: 500;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.tutorial-quiz__play {
    margin-bottom: 1.25rem;
}

.tutorial-quiz__buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tutorial-quiz__btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.5rem;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.tutorial-quiz__btn:hover {
    border-color: var(--primary-light);
    background: var(--primary-bg);
}

.tutorial-quiz__btn--correct {
    border-color: var(--success);
    background: var(--success-bg);
    pointer-events: none;
}

.tutorial-quiz__btn--wrong {
    border-color: var(--danger);
    background: var(--danger-bg);
    pointer-events: none;
}

.tutorial-quiz__btn--disabled {
    pointer-events: none;
    opacity: 0.5;
}

.tutorial-quiz__btn-number {
    font-size: 1.25rem;
    font-weight: 700;
}

.tutorial-quiz__btn-name {
    font-size: 0.6875rem;
    color: var(--gray-500);
}

.tutorial-quiz__feedback {
    min-height: 1.5rem;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.tutorial-quiz__score {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* ===== Hanzi Writer Area ===== */

.tutorial-writers {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tutorial-writer-card {
    text-align: center;
    padding: 0.75rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.tutorial-writer-card__target {
    display: flex;
    justify-content: center;
    margin-bottom: 0.5rem;
}

.tutorial-writer-card__target svg {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
}

.tutorial-writer-card__info {
    font-size: 0.8125rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.tutorial-writer-card__pinyin {
    color: var(--primary);
    font-weight: 500;
}

.tutorial-writer-card__actions {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.tutorial-writer-card__actions .btn {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
}

/* ===== Rules List ===== */

.tutorial-rules {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
    max-width: 400px;
}

.tutorial-rules li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    font-size: 0.9375rem;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
}

.tutorial-rules li:last-child {
    border-bottom: none;
}

.tutorial-rules li::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.75rem;
    color: var(--success);
}

/* ===== Summary List ===== */

.tutorial-summary {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
    max-width: 480px;
    text-align: left;
}

.tutorial-summary li {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    padding: 0.625rem 0;
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.4;
    border-bottom: 1px solid var(--gray-100);
}

.tutorial-summary li:last-child {
    border-bottom: none;
}

.tutorial-summary li i {
    color: var(--success);
    margin-top: 0.1875rem;
    flex-shrink: 0;
}

/* ===== CTA ===== */

.tutorial-cta {
    text-align: center;
    padding: 2rem 0;
}

.tutorial-cta__icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.tutorial-cta .btn {
    font-size: 1.125rem;
    padding: 1rem 2rem;
    min-width: 240px;
}

/* ===== Responsive ===== */

/* Mobile: sidebar as drawer */
@media (max-width: 767px) {
    .tutorial-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        box-shadow: none;
    }

    .tutorial-sidebar--open {
        transform: translateX(0);
        box-shadow: var(--shadow-xl);
    }

    .tutorial-sidebar__backdrop {
        display: block;
    }

    .tutorial-sidebar__close-btn {
        display: block;
    }

    .tutorial-content__header {
        display: flex;
    }

    .tutorial-content {
        position: static;
        height: auto;
        min-height: calc(100vh - 56px);
    }

    .tutorial-content__body {
        padding: 1rem;
    }

    .tutorial-chapter__title {
        font-size: 1.375rem;
    }
}

@media (max-width: 600px) {
    .tutorial-tones {
        grid-template-columns: 1fr;
    }

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

    .tutorial-writers {
        grid-template-columns: 1fr;
    }

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

    .tutorial-quiz__prompt {
        font-size: 3rem;
    }

    .tutorial-breakdown__part {
        font-size: 1.5rem;
    }

    .tutorial-breakdown__result {
        font-size: 2rem;
    }

    .tutorial-section__title {
        font-size: 1.125rem;
    }

    .tutorial-compound__char-hanzi {
        font-size: 1.5rem;
    }

    .tutorial-compound__result-hanzi {
        font-size: 1.5rem;
    }

    .tutorial-sentence__chinese {
        font-size: 1.25rem;
    }
}

@media (max-width: 380px) {
    .tutorial-examples {
        grid-template-columns: 1fr;
    }
}