/* =========================================
   ПоэтТренер — Main Stylesheet
   Стиль: editorial minimalism
   ========================================= */

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

/* ── Переменные ── */
:root {
    --black:       #0a0a0a;
    --white:       #ffffff;
    --gray-100:    #f5f5f5;
    --gray-200:    #e8e8e8;
    --gray-400:    #999999;
    --gray-600:    #555555;
    --accent:      #0a0a0a;

    --font-serif:  'Playfair Display', Georgia, serif;
    --font-sans:   'Inter', system-ui, sans-serif;
    --font-mono:   'IBM Plex Mono', 'Courier New', monospace;

    --border:      1px solid var(--black);
    --border-thin: 1px solid var(--gray-200);

    --radius:      2px;
    --gap:         2rem;
    --max-w:       760px;
    --max-w-wide:  1100px;

    --transition:  150ms ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--black);
    background: var(--white);
    min-height: 100vh;
}

img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }

/* ── Типографика ── */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    line-height: 1.15;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.2rem; }

p + p { margin-top: 0.8em; }

/* ── Layout ── */
.container {
    width: 100%;
    max-width: var(--max-w-wide);
    margin-inline: auto;
    padding-inline: 1.5rem;
}

.container--narrow {
    max-width: var(--max-w);
}

/* ── Header ── */
.site-header {
    border-bottom: var(--border);
    padding-block: 1.2rem;
    position: sticky;
    top: 0;
    background: var(--white);
    z-index: 100;
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-logo {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: -0.03em;
}

.site-logo span {
    font-style: italic;
    font-weight: 400;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.site-nav a {
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.4rem 0.8rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    transition: border-color var(--transition), background var(--transition);
}

.site-nav a:hover {
    border-color: var(--black);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1.2rem;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius);
    border: var(--border);
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
}

.btn--primary {
    background: var(--black);
    color: var(--white);
    border-color: var(--black);
}

.btn--primary:hover {
    background: var(--gray-600);
    border-color: var(--gray-600);
}

.btn--ghost {
    background: transparent;
    color: var(--black);
}

.btn--ghost:hover {
    background: var(--gray-100);
}

.btn--lg {
    padding: 0.8rem 2rem;
    font-size: 1rem;
}

/* ── Footer ── */
.site-footer {
    border-top: var(--border);
    padding-block: 2rem;
    margin-top: 6rem;
    font-size: 0.8rem;
    color: var(--gray-400);
}

.site-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

/* ── Forms ── */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-label {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--gray-600);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: var(--border);
    border-radius: var(--radius);
    background: var(--white);
    color: var(--black);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    font-size: 0.95rem;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    border-color: var(--black);
    box-shadow: 0 0 0 3px rgba(10,10,10,0.08);
}

.form-textarea {
    resize: vertical;
    min-height: 220px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
}

/* ── Alert ── */
.alert {
    padding: 0.9rem 1.1rem;
    border: var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.alert--error {
    background: #fff5f5;
    border-color: #e00;
    color: #c00;
}

/* ── Cards ── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1px;
    border: var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.poem-card {
    padding: 1.5rem;
    border-right: var(--border);
    border-bottom: var(--border);
    text-decoration: none;
    display: block;
    transition: background var(--transition);
    background: var(--white);
}

.poem-card:hover {
    background: var(--gray-100);
}

.poem-card__title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.poem-card__author {
    font-size: 0.8rem;
    color: var(--gray-600);
    margin-bottom: 0.8rem;
}

.poem-card__meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    color: var(--gray-600);
    font-family: var(--font-mono);
}

/* ── Hero ── */
.hero {
    padding-block: 5rem 4rem;
    border-bottom: var(--border);
}

.hero__label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--gray-400);
    margin-bottom: 1.2rem;
}

.hero__title {
    max-width: 640px;
    margin-bottom: 1.5rem;
}

.hero__sub {
    max-width: 480px;
    color: var(--gray-600);
    font-size: 1.05rem;
    margin-bottom: 2.5rem;
}

.hero__actions {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

/* ── Poem viewer ── */
.poem-view {
    padding-block: 3rem;
}

.poem-view__header {
    border-bottom: var(--border);
    padding-bottom: 2rem;
    margin-bottom: 2rem;
}

.poem-view__title {
    margin-bottom: 0.3rem;
}

.poem-view__author {
    color: var(--gray-600);
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

.poem-view__meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

/* Tabs */
/* ── Обёртка полосы табов со стрелками ── */
.tabs-wrap {
    position: relative;
    margin-bottom: 2.5rem;
}

.tabs {
    display: flex;
    gap: 0;
    border-bottom: var(--border);
    margin-bottom: 0;          /* margin теперь на .tabs-wrap */
    overflow-x: auto;
    scrollbar-width: none;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;  /* momentum scroll на iOS */
}

.tabs::-webkit-scrollbar { display: none; }

/* Кнопки-стрелки */
.tabs-arrow {
    position: absolute;
    top: 0;
    bottom: 1px;               /* совпадает с border-bottom */
    width: 36px;
    border: none;
    background: linear-gradient(to right, var(--white) 60%, transparent);
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--gray-400);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    transition: color var(--transition);
    padding: 0;
}
.tabs-arrow:hover:not(:disabled) { color: var(--black); }
.tabs-arrow:disabled { opacity: 0.25; cursor: default; }

.tabs-arrow--prev {
    left: 0;
    background: linear-gradient(to right, var(--white) 55%, transparent);
}
.tabs-arrow--next {
    right: 0;
    background: linear-gradient(to left, var(--white) 55%, transparent);
}

.tab-btn {
    padding: 0.8rem 1.2rem;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border: none;
    border-bottom: 2px solid transparent;
    background: transparent;
    cursor: pointer;
    color: var(--gray-400);
    white-space: nowrap;
    transition: color var(--transition), border-color var(--transition);
    margin-bottom: -1px;
    font-family: var(--font-mono);
    flex-shrink: 0;
}

.tab-btn:hover { color: var(--black); }

.tab-btn.active {
    color: var(--black);
    border-bottom-color: var(--black);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Poem Text Display ── */
.poem-text {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    line-height: 2;
    white-space: pre-wrap;
}

.poem-stanza {
    margin-bottom: 1.5em;
}

.poem-line {
    display: block;
}

/* ── Learning blocks ── */
.blocks-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
    border: var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.block-item {
    padding: 1.2rem 1.5rem;
    border-bottom: var(--border-thin);
    background: var(--white);
    cursor: pointer;
    transition: background var(--transition);
    position: relative;
}

.block-item:last-child { border-bottom: none; }
.block-item:hover { background: var(--gray-100); }

.block-item__num {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--gray-400);
    margin-bottom: 0.4rem;
}

.block-item__text {
    font-family: var(--font-serif);
    font-size: 1rem;
    line-height: 1.7;
    white-space: pre-wrap;
}

/* Метка-описание блока от ИИ */
.block-item__label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--gray-400);
    letter-spacing: 0.04em;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

/* Строки стиха внутри блока */
.block-item__verse {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}


/* ── SR: строки стиха в карточке ── */
.sr-verse {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    padding: 0.25rem 0;
}

.sr-verse-line {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--black);
    display: block;
}

.block-item__verse-line {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--black);
    display: block;
}

.block-item.revealed {
    background: var(--gray-100);
}

.block-item__cover {
    position: absolute;
    inset: 0;
    background: var(--black);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: opacity 0.2s;
}

.block-item.revealed .block-item__cover {
    opacity: 0;
    pointer-events: none;
}

/* ── Fill gaps exercise ── */
.exercise-area {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.gap-line {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 2;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem;
}

.gap-input {
    display: inline-block;
    min-width: 80px;
    max-width: 180px;
    padding: 0.1rem 0.4rem;
    border: none;
    border-bottom: 2px solid var(--black);
    background: transparent;
    font-family: var(--font-serif);
    font-size: 1rem;
    text-align: center;
    outline: none;
    transition: border-color var(--transition);
}

.gap-input:focus { border-color: var(--gray-600); }
.gap-input.correct { border-color: #2e7d32; color: #2e7d32; }
.gap-input.wrong   { border-color: #c62828; color: #c62828; }

/* ── First letters ── */
.letters-desc {
    color: var(--gray-400);
    font-size: 0.85rem;
    margin-bottom: 1.75rem;
    font-family: var(--font-mono);
    letter-spacing: 0.03em;
}

.letters-line {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.35rem 0;
    position: relative;
}

.letters-hint-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--black);
    background: var(--gray-100, #f4f4f4);
    border: 1px solid var(--gray-200, #e0e0e0);
    border-radius: 4px;
    width: 2rem;
    height: 2rem;
    flex-shrink: 0;
    letter-spacing: 0;
    transition: background 0.2s, border-color 0.2s;
}

.letters-input {
    flex: 1;
    border: none;
    border-bottom: 1.5px solid var(--gray-200, #e0e0e0);
    padding: 0.25rem 0.1rem;
    background: transparent;
    font-family: var(--font-serif);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition);
    color: var(--black);
}

.letters-input::placeholder {
    color: var(--gray-300, #bdbdbd);
    font-style: italic;
}

.letters-input:focus {
    border-color: var(--black);
}

.letters-status {
    width: 1.1rem;
    height: 1.1rem;
    flex-shrink: 0;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
}

.letters-input.correct {
    border-color: #2e7d32;
    color: #2e7d32;
}
.letters-input.correct ~ .letters-status::after { content: "✓"; color: #2e7d32; }
.letters-input.correct ~ .letters-hint-badge,
.letters-line:has(.letters-input.correct) .letters-hint-badge {
    background: #f0faf0;
    border-color: #a5d6a7;
    color: #2e7d32;
}

.letters-input.wrong {
    border-color: #c62828;
    color: #c62828;
}
.letters-input.wrong ~ .letters-status::after { content: "✗"; color: #c62828; }
.letters-line:has(.letters-input.wrong) .letters-hint-badge {
    background: #fff5f5;
    border-color: #ffcdd2;
    color: #c62828;
}

/* Stanza separator */
.letters-stanza-sep {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin: 1rem 0;
}

.letters-stanza-sep__line {
    flex: 1;
    height: 1px;
    background: var(--gray-200, #e0e0e0);
}

.letters-stanza-sep__dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--gray-300, #bdbdbd);
    flex-shrink: 0;
}

/* ── Progress bar ── */
.progress-wrap {
    margin-bottom: 2rem;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--gray-400);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.progress-bar {
    height: 3px;
    background: var(--gray-200);
    border-radius: 99px;
    overflow: hidden;
}

.progress-bar__fill {
    height: 100%;
    background: var(--black);
    border-radius: 99px;
    transition: width 0.4s ease;
}

/* ── Info panels ── */
.info-panel {
    border: var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 2rem;
}

.info-panel__header {
    padding: 0.8rem 1.2rem;
    background: var(--black);
    color: var(--white);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.info-panel__body {
    padding: 1.2rem 1.5rem;
}

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

.info-list li {
    padding-left: 1rem;
    position: relative;
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.5;
}

.info-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--gray-400);
}

/* ── Mnemonics ── */
.mnemonic-story {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--gray-600);
    border-left: 3px solid var(--black);
    padding-left: 1.2rem;
    margin-bottom: 1.5rem;
}

/* ── Loading state ── */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--white);
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.loading-overlay.hidden { display: none; }

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 2px solid var(--gray-200);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--gray-400);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── Section divider ── */
.section-title {
    font-size: 0.7rem;
    font-family: var(--font-mono);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gray-400);
    margin-bottom: 1.2rem;
    padding-bottom: 0.6rem;
    border-bottom: var(--border-thin);
}

/* ── Check button area ── */
.exercise-actions {
    display: flex;
    gap: 0.8rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: var(--border-thin);
    flex-wrap: wrap;
    align-items: center;
}

.exercise-result {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--gray-400);
}

/* ── Responsive ── */
@media (max-width: 600px) {
    .hero { padding-block: 3rem 2rem; }
    .tabs { gap: 0; }
    .tab-btn { padding: 0.7rem 0.85rem; font-size: 0.72rem; }
    .tabs-arrow { width: 28px; font-size: 1rem; }
    .site-nav a:not(.btn) { display: none; }
    .site-footer__inner { flex-direction: column; align-items: flex-start; }
}

/* ── Flash messages ── */
.flash {
    padding: 0.9rem 0;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.03em;
    border-bottom: 1px solid transparent;
}
.flash--error {
    background: #fef2f2;
    border-color: #fecaca;
    color: #991b1b;
}
.flash--success {
    background: #f0fdf4;
    border-color: #bbf7d0;
    color: #166534;
}
/* Стили для горизонтального слайдера стихов (SEO-friendly) */
.poem-slider {
    display: grid;
    grid-template-rows: 1fr 1fr; /* Строго 2 строки */
    grid-auto-flow: column; /* Элементы выстраиваются в колонки (вправо) */
    grid-auto-columns: calc((100% - 2rem) / 3); /* Видно 3 колонки одновременно */
    gap: 1rem;
    overflow-x: auto; /* Включаем горизонтальную прокрутку */
    scroll-snap-type: x mandatory; /* Плавное прилипание при прокрутке */
    padding-bottom: 1.5rem; /* Место для ползунка прокрутки */
    scrollbar-width: thin;
}

/* Стилизация ползунка для красоты (WebKit-браузеры: Chrome, Safari) */
.poem-slider::-webkit-scrollbar {
    height: 6px;
}
.poem-slider::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 10px;
}
.poem-slider::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 10px;
}

/* Настройка самих карточек внутри слайдера */
.poem-slider > .poem-card {
    scroll-snap-align: start; /* Карточка прилипает к левому краю */
    margin: 0;
    height: 100%; /* Выравниваем высоту карточек в ряду */
}

/* Адаптация под телефоны и планшеты */
@media (max-width: 900px) {
    .poem-slider {
        /* На планшетах показываем по 2 карточки */
        grid-auto-columns: calc((100% - 1rem) / 2); 
    }
}
@media (max-width: 600px) {
    .poem-slider {
        /* На телефонах показываем 1.2 карточки (чтобы было видно край следующей и понятно, что можно скроллить) */
        grid-auto-columns: 85%; 
    }
}