/* ===========================
   ПЕРЕМЕННЫЕ И БАЗА
   =========================== */
:root {
    /* Палитра */
    --color-primary: #1e3a8a;        /* Глубокий синий */
    --color-primary-dark: #1e293b;
    --color-accent: #14b8a6;         /* Мятный акцент */
    --color-accent-soft: #ccfbf1;
    --color-bg: #fafbfc;
    --color-surface: #ffffff;
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    /* Типографика */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Manrope', 'Inter', sans-serif;

    --fs-base: 17px;
    --fs-small: 14px;
    --fs-h1: clamp(2rem, 4vw, 3rem);
    --fs-h2: clamp(1.5rem, 3vw, 2rem);
    --fs-h3: 1.25rem;

    --lh-body: 1.7;
    --lh-heading: 1.3;

    /* Геометрия */
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.08);

    --sidebar-width: 280px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: var(--fs-base);
    line-height: var(--lh-body);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    margin: 0;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: var(--lh-heading);
    color: var(--color-primary-dark);
    margin-top: 0;
}

p { margin-bottom: 1rem; }

a { color: var(--color-primary); transition: color .2s; }
a:hover { color: var(--color-accent); }

/* ===========================
   ШАПКА
   =========================== */
.top-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    height: 64px;
}

.logo {
    color: var(--color-primary-dark);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
}
.logo-icon {
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-right: 0.5rem;
}

.logo-tagline {
    margin-left: 0.15rem;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.progress-mini {
    gap: 0.75rem;
    font-size: var(--fs-small);
    color: var(--color-text-muted);
}
.progress-bar-mini {
    width: 120px;
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transition: width .5s ease;
}

.mobile-menu-btn {
    font-size: 1.5rem;
    color: var(--color-primary-dark);
}

/* ===========================
   LAYOUT
   =========================== */
.main-wrapper {
    display: flex;
    min-height: calc(100vh - 64px);
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: 2rem 1rem;
    position: sticky;
    top: 64px;
    height: calc(100vh - 64px);
    overflow-y: auto;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.sidebar-title {
    font-size: var(--fs-small);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding: 0 0.75rem 1rem;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex-grow: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    text-decoration: none;
    font-size: 15px;
    transition: all .2s;
}
.nav-item:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}
.nav-item.active {
    background: var(--color-accent-soft);
    color: var(--color-primary);
    font-weight: 600;
}
.nav-item .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-border);
    font-size: 12px;
    font-weight: 700;
    color: var(--color-text-muted);
    flex-shrink: 0;
}
.nav-item.active .step-num {
    background: var(--color-accent);
    color: white;
}

.sidebar-footer {
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    text-align: center;
}

.other-books-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    margin-bottom: 0.9rem;
    padding: 0.7rem 0.85rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    transition: border-color .2s ease, background .2s ease, transform .2s ease;
}
.other-books-btn:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-soft);
    color: var(--color-primary-dark);
    transform: translateY(-1px);
}

.content-area {
    flex-grow: 1;
    padding: 2.5rem 0;
    max-width: 100%;
    overflow-x: hidden;
}

/* ===========================
   ГЛАВНАЯ СТРАНИЦА
   =========================== */
.page-hero {
    padding: 2rem 0 1rem;
}
.hero-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: var(--color-accent-soft);
    color: var(--color-primary);
    border-radius: 999px;
    font-size: var(--fs-small);
    font-weight: 500;
    margin-bottom: 1.5rem;
}
.hero-title {
    font-size: var(--fs-h1);
    font-weight: 800;
    margin-bottom: 1.5rem;
}
.hero-title .accent {
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 640px;
    line-height: 1.6;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.75rem;
    height: 100%;
    transition: all .3s;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}
.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.feature-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}
.feature-card p {
    color: var(--color-text-muted);
    font-size: 15px;
    margin: 0;
}

/* ===========================
   ROADMAP
   =========================== */
.roadmap-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2.5rem;
}
.section-title {
    font-size: var(--fs-h2);
    text-align: center;
    margin-bottom: 0.5rem;
}
.section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
}

.roadmap {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    max-width: 640px;
    margin: 0 auto;
}
.roadmap-item {
    display: flex;
    gap: 1.25rem;
    position: relative;
    padding-bottom: 1.5rem;
}
.roadmap-item:last-child { padding-bottom: 0; }
.roadmap-item::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 40px;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}
.roadmap-item:last-child::before { display: none; }
.roadmap-dot {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 0 0 4px var(--color-accent-soft);
}
.roadmap-content h4 {
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
}
.roadmap-content p {
    color: var(--color-text-muted);
    font-size: 15px;
    margin: 0;
}

/* ===========================
   СТРАНИЦЫ ШАГОВ
   =========================== */
.step-header {
    padding: 1rem 0 2rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 2.5rem;
}
.step-badge {
    display: inline-block;
    padding: 0.3rem 0.9rem;
    background: var(--color-accent-soft);
    color: var(--color-primary);
    border-radius: 999px;
    font-size: var(--fs-small);
    font-weight: 600;
    margin-bottom: 1rem;
}
.step-title {
    font-size: var(--fs-h1);
    margin-bottom: 1rem;
}
.step-lead {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 720px;
    line-height: 1.6;
}

.content-block {
    margin-bottom: 3rem;
    max-width: 820px;
}
.content-block h2 {
    font-size: var(--fs-h2);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.content-block h2 i {
    color: var(--color-accent);
}
.content-block h3 {
    font-size: var(--fs-h3);
    margin-bottom: 0.75rem;
}

/* Callout-блоки */
.callout {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    border-radius: var(--radius-sm);
    margin: 1.5rem 0;
    border-left: 4px solid;
}
.callout i { font-size: 1.25rem; flex-shrink: 0; margin-top: 2px; }
.callout-info {
    background: #eff6ff;
    border-color: #3b82f6;
    color: #1e3a8a;
}
.callout-warning {
    background: #fffbeb;
    border-color: var(--color-warning);
    color: #78350f;
}
.callout-danger {
    background: #fef2f2;
    border-color: var(--color-danger);
    color: #7f1d1d;
}

/* Карточки источников */
.source-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.source-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    transition: all .2s;
}
.source-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}
.source-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}
.source-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}
.source-card p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}
.source-link {
    font-size: 14px;
    font-weight: 500;
}

/* Таблица сравнения */
.comparison-table {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-top: 1rem;
}
.comparison-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    border-bottom: 1px solid var(--color-border);
}
.comparison-row:last-child { border-bottom: none; }
.comparison-header {
    background: var(--color-primary);
    color: white;
    padding: 0.75rem 1rem;
    font-weight: 600;
    font-size: 15px;
}
.comparison-cell {
    padding: 0.75rem 1rem;
    font-size: 15px;
}
.comparison-row:nth-child(even) .comparison-cell {
    background: var(--color-bg);
}

/* Чек-лист */
.checklist {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem 0;
}
.check-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all .2s;
}
.check-item:hover { border-color: var(--color-accent); }
.check-item.checked {
    background: var(--color-accent-soft);
    border-color: var(--color-accent);
}
.check-input {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    accent-color: var(--color-accent);
    flex-shrink: 0;
}
.checklist-result {
    padding: 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--color-primary);
}

/* Навигация между шагами */
.step-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 2rem 0;
    margin-top: 2rem;
    border-top: 1px solid var(--color-border);
}

/* Кнопки */
.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    font-weight: 500;
    padding: 0.65rem 1.5rem;
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

/* ===========================
   АНИМАЦИИ
   =========================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .6s ease, transform .6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   АДАПТИВ
   =========================== */
@media (max-width: 991px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 64px;
        width: 85%;
        max-width: 320px;
        z-index: 99;
        transition: left .3s ease;
        box-shadow: var(--shadow-lg);
    }
    .sidebar.open { left: 0; }

    .sidebar-overlay {
        position: fixed;
        inset: 64px 0 0 0;
        background: rgba(0,0,0,0.4);
        opacity: 0;
        pointer-events: none;
        transition: opacity .3s;
        z-index: 98;
    }
    .sidebar-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }

    .content-area { padding: 1.5rem 0; }
    .roadmap-section { padding: 1.5rem; }

    .comparison-row { grid-template-columns: 1fr; }
    .comparison-cell { border-bottom: 1px dashed var(--color-border); }
    .comparison-cell:last-child { border-bottom: none; }
}

@media (max-width: 576px) {
    :root { --fs-base: 16px; }
    .step-navigation { flex-direction: column; }
    .step-navigation .btn { width: 100%; }
}

/* ===========================
   ШАГ 2: МЕТОДОЛОГИЯ
   =========================== */
.method-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}
.method-list li {
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    position: relative;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
}
.method-list li::before {
    content: '✓';
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-accent);
    font-weight: 700;
    font-size: 1.1rem;
}

/* Accordion */
.accordion-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
    overflow: hidden;
}
.accordion-button {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-primary-dark);
    background: var(--color-surface);
    padding: 1rem 1.25rem;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: background .2s;
}
.accordion-button:hover {
    background: var(--color-bg);
}
.accordion-button:not(.collapsed) {
    background: var(--color-accent-soft);
    color: var(--color-primary);
    box-shadow: none;
}
.accordion-button:focus {
    box-shadow: none;
    border-color: var(--color-accent);
}
.accordion-button::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%231e3a8a'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
}
.accordion-body {
    padding: 1rem 1.25rem;
    font-size: 15px;
    line-height: 1.6;
    color: var(--color-text);
}

.metric-formula {
    margin: 0.9rem 0 1rem;
    padding: 0.9rem 1rem;
    border-left: 4px solid var(--color-accent);
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
    overflow-wrap: anywhere;
}

/* Mistakes list */
.mistakes-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}
.mistake-item {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-danger);
    border-radius: var(--radius-sm);
}
.mistake-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #fef2f2;
    color: var(--color-danger);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1rem;
}
.mistake-content h4 {
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
    color: var(--color-primary-dark);
}
.mistake-content p {
    font-size: 15px;
    color: var(--color-text-muted);
    margin: 0;
}

/* Code block */
.code-block {
    background: #1e293b;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin: 1rem 0;
}
.code-header {
    background: #334155;
    color: #cbd5e1;
    padding: 0.5rem 1rem;
    font-size: 13px;
    font-family: var(--font-body);
}
.code-block pre {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
    margin: 0;
    padding: 1rem;
    color: #e2e8f0;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    overflow-x: hidden;
    line-height: 1.5;
}

/* ===========================
   ШАГ 3: АНАЛИЗ
   =========================== */
.chart-guide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.chart-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all .3s;
}
.chart-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}
.chart-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.chart-card h4 {
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}
.chart-purpose {
    font-size: 14px;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}
.chart-example {
    font-size: 13px;
    color: var(--color-text-muted);
    font-style: italic;
    margin: 0;
}

/* Quiz */
.quiz-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 1.5rem 0;
}
.quiz-question {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
}
.quiz-text {
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 1rem;
    color: var(--color-primary-dark);
}
.quiz-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.5rem;
}
.quiz-option {
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    transition: all .2s;
    font-family: var(--font-body);
}
.quiz-option:hover:not(.disabled) {
    border-color: var(--color-primary);
    background: var(--color-accent-soft);
}
.quiz-option.correct {
    background: #dcfce7;
    border-color: #22c55e;
    color: #166534;
}
.quiz-option.wrong {
    background: #fee2e2;
    border-color: var(--color-danger);
    color: #7f1d1d;
}
.quiz-option.disabled {
    cursor: default;
    opacity: 0.7;
}
.quiz-feedback {
    margin-top: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 14px;
    display: none;
}
.quiz-feedback.show { display: block; }
.quiz-feedback.correct {
    background: #dcfce7;
    color: #166534;
}
.quiz-feedback.wrong {
    background: #fee2e2;
    color: #7f1d1d;
}
.quiz-result {
    padding: 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--color-primary);
    text-align: center;
    font-size: 1.1rem;
}
/* ===========================
   ШАГ 4: IMRAD
   =========================== */

/* IMRAD Overview Cards */
.imrad-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.imrad-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    transition: all .3s;
}
.imrad-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}
.imrad-letter {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 auto 1rem;
}
.imrad-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}
.imrad-question {
    font-size: 14px;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.imrad-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0;
}

/* Funnel Diagram */
.funnel-diagram {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem 0;
    max-width: 600px;
}
.funnel-level {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.funnel-width {
    height: 40px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}
.funnel-width.wide { width: 100%; }
.funnel-width.medium { width: 75%; }
.funnel-width.narrow { width: 50%; }
.funnel-width.tiny { width: 25%; }
.funnel-text {
    font-size: 15px;
    color: var(--color-text);
}

/* Example Tabs */
.example-tabs {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 1.5rem 0;
}
.example-tabs-header {
    display: flex;
    border-bottom: 1px solid var(--color-border);
}
.example-tab {
    flex: 1;
    padding: 1rem;
    background: var(--color-bg);
    border: none;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-muted);
    transition: all .2s;
    font-family: var(--font-body);
}
.example-tab:hover {
    background: var(--color-border);
}
.example-tab.active {
    background: var(--color-surface);
    color: var(--color-primary);
    border-bottom: 3px solid var(--color-accent);
}
.example-tabs-content {
    padding: 1.5rem;
}
.example-panel {
    display: none;
}
.example-panel.active {
    display: block;
}
.example-text {
    padding: 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 1rem;
    border-left: 4px solid var(--color-border);
}
.example-comment {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.6;
}
.example-comment strong {
    color: var(--color-primary);
}

/* Discussion Structure */
.discussion-structure {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem 0;
}
.discussion-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all .2s;
}
.discussion-item:hover {
    border-color: var(--color-accent);
    transform: translateX(5px);
}
.discussion-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-accent-soft);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}
.discussion-text {
    font-size: 15px;
    color: var(--color-text);
}

/* ===========================
   ШАГ 5: ВЫБОР ЖУРНАЛА
   =========================== */
.source-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-accent-soft);
    color: var(--color-primary);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    margin-top: 0.5rem;
}

/* Quartile Grid */
.quartile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.quartile-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    transition: all .3s;
    border-top: 4px solid var(--color-border);
}
.quartile-card.q1 { border-top-color: #22c55e; }
.quartile-card.q2 { border-top-color: #3b82f6; }
.quartile-card.q3 { border-top-color: #f59e0b; }
.quartile-card.q4 { border-top-color: #ef4444; }
.quartile-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.quartile-label {
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-heading);
    margin-bottom: 0.25rem;
}
.quartile-card.q1 .quartile-label { color: #22c55e; }
.quartile-card.q2 .quartile-label { color: #3b82f6; }
.quartile-card.q3 .quartile-label { color: #f59e0b; }
.quartile-card.q4 .quartile-label { color: #ef4444; }
.quartile-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}
.quartile-meaning {
    font-size: 14px;
    color: var(--color-text);
    line-height: 1.5;
}

/* Quiz Result Box */
.quiz-result-box {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
    text-align: center;
}
.result-title {
    font-size: 14px;
    font-weight: 600;
    opacity: 0.9;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.result-text {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.5;
}

/* ===========================
   ШАГ 6: УПАКОВКА
   =========================== */
.roadmap .roadmap-item {
    padding-bottom: 1.5rem;
}

/* Адаптив для квартилей */
@media (max-width: 576px) {
    .quartile-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ===========================
   ШАГ 7: РЕЦЕНЗИРОВАНИЕ
   =========================== */

/* Decision Cards */
.decision-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.decision-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    transition: all .3s;
    border-top: 4px solid var(--color-border);
}
.decision-card.accept { border-top-color: #22c55e; }
.decision-card.minor { border-top-color: #3b82f6; }
.decision-card.major { border-top-color: #f59e0b; }
.decision-card.reject { border-top-color: #ef4444; }
.decision-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.decision-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}
.decision-card.accept .decision-icon { color: #22c55e; }
.decision-card.minor .decision-icon { color: #3b82f6; }
.decision-card.major .decision-icon { color: #f59e0b; }
.decision-card.reject .decision-icon { color: #ef4444; }
.decision-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}
.decision-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}
.decision-probability {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}
.decision-action {
    font-size: 14px;
    color: var(--color-text);
    line-height: 1.5;
    margin: 0;
}

/* Final Congratulations */
.final-congratulations {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    border-radius: var(--radius);
    padding: 2.5rem;
    text-align: center;
    margin-top: 2rem;
}
.congratulations-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}
.final-congratulations h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: white;
}
.final-congratulations p {
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* Code в тексте */
code {
    background: var(--color-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--color-primary);
}

/* Адаптив для карточек решений */
@media (max-width: 576px) {
    .decision-cards {
        grid-template-columns: 1fr 1fr;
    }
}


/* ===========================
   Версия 1.7: адаптивность и учебные служебные блоки
   =========================== */
.source-note {
    margin-top: 1.25rem;
    padding: 1rem 1.15rem;
    background: #f8fafc;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--color-text-muted);
}
.source-note a { font-weight: 600; }
.project-about { padding-bottom: 1rem; }

/* Воронки: геометрия не должна выталкивать подписи за экран */
.funnel-diagram { max-width: 760px; width: 100%; }
.funnel-level {
    display: grid;
    grid-template-columns: minmax(180px, 360px) minmax(0, 1fr);
    align-items: center;
    gap: 1rem;
}
.funnel-width { max-width: 100%; justify-self: center; }
.funnel-width.wide { width: 100%; }
.funnel-width.medium { width: 78%; }
.funnel-width.narrow { width: 56%; }
.funnel-width.tiny { width: 34%; }

@media (max-width: 767px) {
    .container-fluid.px-4 { padding-left: 1rem !important; padding-right: 1rem !important; }
    .page-hero { padding-top: .75rem; }
    .roadmap-section { padding: 1.1rem; }
    .content-block { margin-bottom: 2.25rem; }
    .callout { padding: 1rem; }

    /* Сравнительные таблицы превращаются в карточки с явными подписями столбцов */
    .comparison-table { border: 0; overflow: visible; background: transparent; }
    .comparison-row { display: block; margin-bottom: 1rem; border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; background: var(--color-surface); box-shadow: var(--shadow-sm); }
    .comparison-row:first-child { display: none; }
    .comparison-cell { display: grid; grid-template-columns: minmax(105px, 38%) minmax(0, 1fr); gap: .75rem; border-bottom: 1px solid var(--color-border) !important; padding: .8rem .9rem; overflow-wrap: anywhere; }
    .comparison-cell:last-child { border-bottom: 0 !important; }
    .comparison-cell::before { content: attr(data-label); font-size: 12px; font-weight: 700; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .02em; }

    /* Воронка становится вертикальной ступенчатой схемой */
    .funnel-level { display: block; padding: .8rem 0; border-bottom: 1px solid var(--color-border); }
    .funnel-level:last-child { border-bottom: 0; }
    .funnel-width { height: 10px; margin: 0 auto .65rem; }
    .funnel-width.wide { width: 100%; }
    .funnel-width.medium { width: 84%; }
    .funnel-width.narrow { width: 68%; }
    .funnel-width.tiny { width: 52%; }
    .funnel-text { text-align: center; line-height: 1.45; overflow-wrap: anywhere; }

    .quartile-grid, .decision-cards { grid-template-columns: 1fr; }
    .source-grid, .chart-guide, .imrad-overview { grid-template-columns: 1fr; }
    .quiz-options { grid-template-columns: 1fr; }
    .example-tabs-header { flex-direction: column; }
    .example-tab.active { border-bottom: 0; border-left: 3px solid var(--color-accent); }
    .code-block pre { white-space: pre-wrap; overflow-wrap: anywhere; }
}

.glossary-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:1rem; margin-top:1rem; }
.glossary-item { display:flex; flex-direction:column; gap:.45rem; padding:1rem 1.1rem; background:var(--color-surface); border:1px solid var(--color-border); border-radius:var(--radius-sm); }
.glossary-item strong { color:var(--color-primary-dark); }
.glossary-item span { font-size:14px; color:var(--color-text-muted); line-height:1.55; }
@media (max-width: 576px) { .glossary-grid { grid-template-columns:1fr; } }


/* ===========================
   Ревизия 1.7: ширина, интерактивность и служебные компоненты
   =========================== */
.content-area > .container-fluid {
    width: 100%;
    max-width: 1120px;
    margin-left: auto;
    margin-right: auto;
}
.home-page { width: 100%; }
.hero-kicker {
    margin-bottom: .55rem;
    color: var(--color-accent);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(1rem, 1.6vw, 1.25rem);
    letter-spacing: .01em;
}
.home-reference { max-width: 820px; }
.home-bottom-cta {
    max-width: 820px;
    margin: 3rem 0 0;
    padding: 1.6rem 1.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}
.home-bottom-cta h2 { margin-bottom: .35rem; font-size: 1.4rem; }
.home-bottom-cta p { margin: 0; color: var(--color-text-muted); }
.author-card {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}
.author-photo {
    width: 92px;
    height: 92px;
    flex: 0 0 92px;
    border-radius: 50%;
    object-fit: cover;
    object-position: 50% 28%;
    border: 3px solid var(--color-accent-soft);
    box-shadow: var(--shadow-sm);
}
.author-name { margin-bottom: .2rem; }

/* Прогресс теперь отражает завершённые, а не просто открытые шаги */
.nav-item.step-complete .step-num {
    background: var(--color-accent-soft);
    color: #0f766e;
}
.nav-item.step-complete .step-num::after {
    content: '✓';
    font-size: 12px;
}
.nav-item.step-complete .step-num { font-size: 0; }
.progress-text { min-width: 36px; text-align: right; }

/* Кликабельные карточки источников */
a.source-card {
    display: block;
    color: inherit;
    text-decoration: none;
}
a.source-card:hover { color: inherit; }
a.source-card .source-link { display: inline-flex; align-items: center; gap: .35rem; }

/* Статические списки требований вместо декоративных чекбоксов */
.requirement-list {
    display: flex;
    flex-direction: column;
    gap: .75rem;
    margin: 1.4rem 0;
}
.requirement-item {
    display: flex;
    gap: .85rem;
    align-items: flex-start;
    padding: 1rem 1.1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}
.requirement-icon {
    width: 26px;
    height: 26px;
    flex: 0 0 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-accent-soft);
    color: #0f766e;
    font-weight: 800;
}

/* Осмысленная обратная связь интерактивных проверок */
.checklist-result {
    border: 1px solid var(--color-border);
    background: var(--color-surface);
}
.checklist-result .result-summary { display: block; margin-top: .35rem; font-weight: 500; color: var(--color-text); }
.checklist-result.result-good { border-color: #86efac; background: #f0fdf4; color: #166534; }
.checklist-result.result-mid { border-color: #fde68a; background: #fffbeb; color: #92400e; }
.checklist-result.result-low { border-color: #fecaca; background: #fef2f2; color: #991b1b; }

/* Обычный словарь: термин + определение, без карточек */
.glossary-page { max-width: 900px; }
.glossary-letter {
    margin-top: 2rem;
    padding-bottom: .4rem;
    border-bottom: 2px solid var(--color-primary);
    color: var(--color-primary);
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
}
.glossary-letter:first-child { margin-top: 0; }
.glossary-list { margin: 0; padding: 0; }
.glossary-entry {
    display: grid;
    grid-template-columns: minmax(220px, 32%) minmax(0, 1fr);
    gap: 1.4rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}
.glossary-entry dt { font-weight: 700; color: var(--color-primary-dark); }
.glossary-entry dd { margin: 0; color: var(--color-text); }

/* График квартилей */
.quartile-chart-wrap { margin: 1.5rem 0; }
.quartile-chart {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--color-border);
    min-height: 116px;
}
.quartile-segment {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: .9rem .55rem;
    color: #fff;
}
.quartile-segment strong { font-size: 1.55rem; font-family: var(--font-heading); }
.quartile-segment span { font-size: 12px; line-height: 1.35; opacity: .95; }
.quartile-segment.q1 { background: #15803d; }
.quartile-segment.q2 { background: #2563eb; }
.quartile-segment.q3 { background: #d97706; }
.quartile-segment.q4 { background: #b91c1c; }
.quartile-scale {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: .55rem;
    color: var(--color-text-muted);
    font-size: 13px;
}
.quartile-caption { margin-top: .8rem; color: var(--color-text-muted); font-size: 14px; }

/* Иконка диаграммы рассеяния и вспомогательные ссылки */
.chart-svg-icon { width: 32px; height: 32px; display: block; }
.placeholder-resource {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.1rem;
    border: 1px dashed var(--color-accent);
    border-radius: var(--radius-sm);
    background: #f0fdfa;
    color: var(--color-primary-dark);
    text-decoration: none;
}
.placeholder-resource[aria-disabled="true"] { cursor: default; }
.placeholder-resource small { color: var(--color-text-muted); }

/* Длинные ссылки, DOI и примеры не должны создавать горизонтальную прокрутку */
code, .example-text, .code-block, .source-note, .callout, .citation-example {
    overflow-wrap: anywhere;
    word-break: break-word;
}
.citation-example {
    padding: 1rem 1.15rem;
    background: #1f2d43;
    color: #eef2f7;
    border-radius: var(--radius-sm);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .9rem;
    line-height: 1.6;
    white-space: normal;
}

/* Профиль подбора журнала */
.journal-profile {
    margin: .85rem 0 0;
    padding-left: 1.2rem;
    text-align: left;
}
.journal-profile li { margin-bottom: .35rem; }
.quiz-option.selected {
    border-color: var(--color-accent);
    background: var(--color-accent-soft);
    color: var(--color-primary-dark);
}

/* Красные флаги журнала */
.red-flag-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .85rem;
    margin: 1.2rem 0;
}
.red-flag-item {
    display: flex;
    gap: .75rem;
    padding: 1rem;
    border: 1px solid #fecaca;
    background: #fff7f7;
    border-radius: var(--radius-sm);
}
.red-flag-item i { color: var(--color-danger); flex: 0 0 auto; margin-top: 2px; }
.red-flag-item strong { display: block; margin-bottom: .2rem; }

.course-finish {
    max-width: 820px;
    padding: 1.6rem;
    background: linear-gradient(135deg, #eff6ff, #f0fdfa);
    border: 1px solid #bfdbfe;
    border-radius: var(--radius);
}

@media (max-width: 767px) {
    .content-area > .container-fluid { max-width: 100%; }
    .home-bottom-cta { flex-direction: column; align-items: stretch; }
    .home-bottom-cta .btn { width: 100%; }
    .author-card { align-items: flex-start; }
    .author-photo { width: 72px; height: 72px; flex-basis: 72px; }
    .glossary-entry { grid-template-columns: 1fr; gap: .35rem; }
    .quartile-chart { min-height: 96px; }
    .quartile-segment { padding: .7rem .25rem; }
    .quartile-segment strong { font-size: 1.15rem; }
    .quartile-segment span { font-size: 10px; }
    .red-flag-grid { grid-template-columns: 1fr; }
}

@media (max-width: 430px) {
    .quartile-chart { grid-template-columns: 1fr; }
    .quartile-segment { min-height: 64px; }
    .quartile-scale { display: none; }
    .author-card { flex-direction: column; }
}

/* ===========================
   Ревизия 1.7.2: финальная доводка интерактивности и малых экранов
   =========================== */
.home-cta-actions {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: .35rem;
    flex: 0 0 auto;
}
.home-cta-actions .btn-link {
    color: var(--color-text-muted);
    text-decoration: none;
}
.home-cta-actions .btn-link:hover { color: var(--color-primary); }
.breakable-code,
code.breakable-code {
    white-space: normal;
    word-break: break-all;
    overflow-wrap: anywhere;
}
.code-block,
.citation-example { max-width: 100%; overflow: hidden; }
.citation-example { word-break: normal; overflow-wrap: anywhere; }
.quiz-option.disabled { pointer-events: none; }

@media (max-width: 767px) {
    .home-bottom-cta { max-width: 100%; }
    .home-cta-actions { width: 100%; }
    code { white-space: normal; overflow-wrap: anywhere; word-break: break-word; }
}

/* ===========================
   SciPath Charts — учебная версия 0.2
   =========================== */
.brand-mark {
    width: 34px;
    height: 34px;
    object-fit: contain;
    margin-right: .6rem;
}
.course-shell {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
}
.wide-block { max-width: 1040px; }
.sidebar-section-title {
    margin: 1rem .75rem .35rem;
    padding-top: .8rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 11px;
    line-height: 1.35;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
}
.chart-nav-item { padding-top: .52rem; padding-bottom: .52rem; font-size: 13px; line-height: 1.25; }
.chart-nav-item .step-num { width: 22px; height: 22px; font-size: 11px; }
.hero-kicker {
    color: var(--color-accent);
    font-family: var(--font-heading);
    font-weight: 800;
    letter-spacing: .02em;
    margin-bottom: .55rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.btn-outline-primary { color: var(--color-primary); border-color: #cbd5e1; background: var(--color-surface); }
.btn-outline-primary:hover { color: var(--color-primary); border-color: var(--color-accent); background: var(--color-accent-soft); }

.question-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1.4rem;
}
.question-card {
    min-height: 150px;
    padding: 1.2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: .45rem;
    transition: transform .2s, border-color .2s, box-shadow .2s;
}
.question-card:hover { color: var(--color-text); border-color: var(--color-accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.question-card strong { color: var(--color-primary-dark); font-family: var(--font-heading); }
.question-card small { color: var(--color-text-muted); line-height: 1.45; }
.question-num { color: var(--color-accent); font-family: var(--font-heading); font-size: .8rem; font-weight: 800; letter-spacing: .1em; }

.module-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1.4rem; }
.module-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    padding: 1.35rem;
    position: relative;
    transition: transform .2s, border-color .2s, box-shadow .2s;
}
.module-card:hover { transform: translateY(-2px); border-color: var(--color-accent); box-shadow: var(--shadow-sm); }
.module-icon { width: 44px; height: 44px; border-radius: var(--radius-sm); background: var(--color-accent-soft); color: var(--color-primary); display: flex; align-items: center; justify-content: center; font-size: 1.25rem; margin-bottom: .9rem; }
.module-meta { color: var(--color-accent); font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
.module-card h3 { margin: .25rem 0 .25rem; font-size: 1.08rem; }
.module-card p { color: var(--color-text-muted); margin-bottom: .85rem; font-size: 14px; }
.module-chips { display: flex; flex-wrap: wrap; gap: .35rem; margin-bottom: 1rem; }
.module-chips span { display: inline-block; background: var(--color-bg); border: 1px solid var(--color-border); color: var(--color-text-muted); border-radius: 999px; padding: .2rem .5rem; font-size: 11px; }
.module-link { font-size: 14px; font-weight: 700; text-decoration: none; }

.lesson-flow { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .75rem; margin: 1.5rem 0; }
.lesson-flow-item { border-top: 3px solid var(--color-accent); padding: 1rem .75rem .25rem; }
.lesson-flow-item > span { color: var(--color-text-muted); font-size: 12px; font-weight: 800; }
.lesson-flow-item strong { display: block; color: var(--color-primary-dark); font-family: var(--font-heading); margin: .25rem 0; }
.lesson-flow-item small { color: var(--color-text-muted); line-height: 1.4; display: block; }

.chooser-section { scroll-margin-top: 90px; }
.chooser-heading { display: flex; justify-content: space-between; align-items: end; margin-bottom: 1rem; }
.chooser-heading h2 { margin: .2rem 0 0; display: block; }
.chooser-label { color: var(--color-accent); font-size: 12px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.chooser-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
.chooser-card {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr) 22px;
    align-items: center;
    gap: .85rem;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
    transition: border-color .2s, transform .2s;
}
.chooser-card:hover { color: var(--color-text); border-color: var(--color-accent); transform: translateX(2px); }
.chooser-icon { width: 42px; height: 42px; border-radius: 10px; background: var(--color-accent-soft); color: var(--color-primary); display: flex; align-items: center; justify-content: center; font-size: 1.15rem; }
.chooser-card strong { display: block; color: var(--color-primary-dark); margin-bottom: .2rem; }
.chooser-card small { display: block; color: var(--color-text-muted); line-height: 1.35; }
.chooser-arrow { color: var(--color-accent); }

.principle-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1.25rem; }
.principle-card { padding: 1.25rem; border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); }
.principle-card > span { color: var(--color-accent); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.principle-card h3 { font-size: 1.08rem; margin: .35rem 0 .45rem; }
.principle-card p { color: var(--color-text-muted); font-size: 14px; margin: 0; }
.editorial-sequence { padding-left: 1.4rem; }
.editorial-sequence li { margin-bottom: .85rem; padding-left: .35rem; }

.english-title { color: var(--color-text-muted); font-size: .58em; font-weight: 600; white-space: normal; }
.chart-passport {
    display: grid;
    grid-template-columns: 92px repeat(3, minmax(0, 1fr));
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-surface);
}
.passport-icon { background: var(--color-accent-soft); color: var(--color-primary); display: flex; align-items: center; justify-content: center; font-size: 2rem; min-height: 145px; }
.passport-item { padding: 1.1rem; border-left: 1px solid var(--color-border); }
.passport-item span { display: block; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .04em; font-size: 10px; font-weight: 800; margin-bottom: .45rem; }
.passport-item strong { display: block; color: var(--color-primary-dark); font-size: 14px; line-height: 1.5; }

.evolution-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1.35rem; }
.evolution-card { border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); padding: 1rem; }
.stage-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: .75rem; }
.stage-head span { color: var(--color-text-muted); font-size: 12px; font-weight: 800; }
.stage-head strong { font-family: var(--font-heading); color: var(--color-primary-dark); }
.chart-placeholder { aspect-ratio: 4 / 3; border: 1px dashed #a7f3d0; border-radius: var(--radius-sm); background: #f0fdfa; color: #0f766e; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: .65rem; text-align: center; padding: 1rem; margin-bottom: .85rem; }
.chart-placeholder i { font-size: 2rem; color: var(--color-primary); }
.chart-placeholder span { font-size: 13px; font-weight: 700; }
.evolution-card p { color: var(--color-text-muted); font-size: 14px; margin: 0; }
.stage-3 { border-color: #99f6e4; box-shadow: 0 0 0 2px #f0fdfa inset; }
.lesson-placeholder-note { display: flex; gap: .85rem; padding: 1rem 1.1rem; border: 1px dashed #94a3b8; border-radius: var(--radius-sm); background: #f8fafc; color: var(--color-text-muted); }
.lesson-placeholder-note i { color: var(--color-primary); font-size: 1.25rem; flex: 0 0 auto; }

@media (max-width: 1100px) {
    .module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .lesson-flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .chart-passport { grid-template-columns: 72px 1fr; }
    .passport-icon { grid-row: span 3; }
    .passport-item { border-left: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
    .passport-item:last-child { border-bottom: 0; }
}
@media (max-width: 767px) {
    .question-grid, .module-grid, .principle-grid, .evolution-grid, .chooser-grid { grid-template-columns: 1fr; }
    .lesson-flow { grid-template-columns: 1fr 1fr; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .hero-actions .btn { width: 100%; }
    .chart-passport { grid-template-columns: 1fr; }
    .passport-icon { min-height: 90px; grid-row: auto; }
    .passport-item { border-left: 0; border-top: 1px solid var(--color-border); border-bottom: 0; }
    .chooser-card { grid-template-columns: 38px minmax(0,1fr) 18px; padding: .85rem; }
    .chooser-icon { width: 38px; height: 38px; }
}
@media (max-width: 430px) {
    .lesson-flow { grid-template-columns: 1fr; }
    .brand-mark { width: 30px; height: 30px; }
    .logo-text { font-size: 1.05rem; }
}


/* v0.2 — completed lesson blocks */
.data-structure-card{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}
.data-structure-card>div{padding:16px 18px;border:1px solid var(--border-color,#e5e7eb);border-radius:14px;background:#f8fafc;display:flex;flex-direction:column;gap:5px}
.data-structure-card span{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:#64748b;font-weight:700}.data-structure-card strong{font-size:.96rem;line-height:1.45}
.rule-list{display:grid;gap:12px}.rule-item{display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:start;padding:14px 16px;border:1px solid #e7edf3;border-radius:14px;background:#fff}.rule-item>span{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#e7f7f5;color:#0f766e;font-weight:800}.rule-item p{margin:3px 0 0;line-height:1.55}
.evolution-grid.with-images{align-items:stretch}.chart-figure{margin:0 0 14px}.chart-figure img{display:block;width:100%;height:auto;aspect-ratio:16/10;object-fit:contain;background:#fff;border:1px solid #e7edf3;border-radius:12px}.chart-figure figcaption{font-size:.8rem;line-height:1.45;color:#64748b;margin-top:8px}
.lesson-checklist{display:grid;gap:10px;margin-top:16px}.lesson-checklist .checklist-item{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid #e7edf3;border-radius:12px;background:#fff;cursor:pointer}.lesson-checklist input{position:absolute;opacity:0;pointer-events:none}.lesson-checklist .check-box{width:24px;height:24px;flex:0 0 24px;border:2px solid #cbd5e1;border-radius:7px;display:flex;align-items:center;justify-content:center;color:transparent}.lesson-checklist input:checked+.check-box{background:#16a394;border-color:#16a394;color:white}.checklist-result{margin-top:12px;padding:12px 14px;border-radius:10px;background:#f1f5f9;color:#475569;font-size:.92rem}.checklist-result.complete{background:#e8f7f4;color:#0f766e;font-weight:700}.takeaway-block{border-left:4px solid #16a394}
@media(max-width:900px){.data-structure-card{grid-template-columns:1fr}.evolution-grid.with-images{grid-template-columns:1fr}}

/* ===========================
   v0.3 — lesson redesign
   =========================== */
.top-header { height: 76px; }
.top-header > .container-fluid { height: 100%; }
.logo { font-size: 1.45rem; line-height: 1; }
.brand-mark { width: 42px; height: 42px; object-fit: contain; margin-right: .7rem; flex: 0 0 42px; }
.logo-tagline { font-size: 1rem; margin-left: .22rem; }
.main-wrapper { min-height: calc(100vh - 76px); }
.sidebar { top: 76px; height: calc(100vh - 76px); }

.english-subtitle {
    margin-top: -.35rem;
    margin-bottom: 1rem;
    color: var(--color-text-muted);
    font-family: var(--font-heading);
    font-size: clamp(1rem, 1.7vw, 1.22rem);
    font-weight: 600;
}
.theory-block p { max-width: 980px; }
.theory-block p:last-child { margin-bottom: 0; }

.compact-passport-wrap { padding-top: 1.25rem; padding-bottom: 1.25rem; }
.chart-passport.compact-passport {
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    overflow: hidden;
    background: #fff;
}
.compact-passport .passport-item {
    min-height: auto;
    padding: 1.15rem 1.3rem;
    background: #fff;
    border: 0;
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: .35rem;
}
.compact-passport .passport-item:nth-child(2n) { border-right: 0; }
.compact-passport .passport-item:nth-last-child(-n+2) { border-bottom: 0; }
.compact-passport .passport-item span,
.compact-data-card span {
    color: var(--color-text-muted);
    font-size: .76rem;
    font-weight: 800;
    letter-spacing: .055em;
    text-transform: uppercase;
}
.compact-passport .passport-item strong { font-size: .98rem; line-height: 1.5; }

.data-structure-card.compact-data-card {
    grid-template-columns: repeat(3,minmax(0,1fr));
    gap: .75rem;
    margin-top: 1rem;
}
.compact-data-card > div {
    min-height: 0;
    padding: 1rem 1.05rem;
    background: #fff;
}
.compact-data-card strong { font-size: .93rem; line-height: 1.45; }

.zoomable-figure {
    position: relative;
    cursor: zoom-in;
}
.zoomable-figure img { transition: transform .2s ease, opacity .2s ease; }
.zoomable-figure:hover img { transform: scale(1.012); }
.zoom-hint {
    position: absolute;
    right: .7rem;
    top: .7rem;
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .35rem .55rem;
    border-radius: 999px;
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(148,163,184,.35);
    color: #475569;
    font-size: .74rem;
    font-weight: 700;
    opacity: 0;
    transform: translateY(-2px);
    transition: .2s ease;
    pointer-events: none;
}
.zoomable-figure:hover .zoom-hint { opacity: 1; transform: translateY(0); }
.chart-lightbox {
    position: fixed;
    inset: 0;
    z-index: 5000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem 2rem;
    background: rgba(15,23,42,.88);
    backdrop-filter: blur(8px);
}
.chart-lightbox.open { display: flex; }
.chart-lightbox img {
    max-width: min(1400px, 94vw);
    max-height: 88vh;
    object-fit: contain;
    background: #fff;
    border-radius: 14px;
    box-shadow: 0 24px 80px rgba(0,0,0,.32);
}
.chart-lightbox-close {
    position: absolute;
    top: 1.15rem;
    right: 1.4rem;
    width: 44px;
    height: 44px;
    border: 0;
    border-radius: 50%;
    background: #fff;
    color: #0f172a;
    font-size: 1.15rem;
}
body.lightbox-open { overflow: hidden; }

.takeaway-block { border-left: 4px solid var(--color-accent); padding-left: 1.5rem; }
.takeaway-summary { display: grid; grid-template-columns: 64px minmax(0,1fr); gap: 1.1rem; align-items: start; }
.takeaway-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: var(--color-accent-soft);
    color: var(--color-primary);
    font-size: 1.5rem;
}
.takeaway-summary h3 { margin: 0 0 .65rem; }
.takeaway-summary ul { margin: 0; padding-left: 1.2rem; }
.takeaway-summary li { margin-bottom: .55rem; }
.takeaway-summary li:last-child { margin-bottom: 0; }

.home-bottom-cta { align-items: center; }
.home-cta-actions { display: flex; flex-direction: column; align-items: center; justify-content: center; min-width: 280px; }
.home-cta-actions .btn-primary { min-width: 240px; }

/* Dictionary */
.glossary-intro { max-width: 900px; }
.glossary-list { margin: 1.5rem 0 0; border-top: 1px solid var(--color-border); }
.glossary-entry {
    display: grid;
    grid-template-columns: minmax(180px, 260px) minmax(0,1fr);
    gap: 1.5rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}
.glossary-entry dt { font-family: var(--font-heading); font-weight: 800; color: var(--color-primary-dark); }
.glossary-entry dt small { display: block; margin-top: .15rem; font-family: var(--font-body); color: var(--color-text-muted); font-weight: 600; }
.glossary-entry dd { margin: 0; color: #475569; }

@media(max-width: 900px){
    .chart-passport.compact-passport { grid-template-columns: 1fr; }
    .compact-passport .passport-item { border-right: 0; border-bottom: 1px solid var(--color-border) !important; }
    .compact-passport .passport-item:last-child { border-bottom: 0 !important; }
    .data-structure-card.compact-data-card { grid-template-columns: 1fr; }
    .glossary-entry { grid-template-columns: 1fr; gap: .35rem; }
}
@media(max-width: 767px){
    .top-header { height: 68px; }
    .main-wrapper { min-height: calc(100vh - 68px); }
    .sidebar { top: 68px; height: calc(100vh - 68px); }
    .brand-mark { width: 36px; height: 36px; flex-basis: 36px; }
    .logo { font-size: 1.28rem; }
    .chart-lightbox { padding: 3.5rem .75rem 1rem; }
    .zoom-hint { opacity: .88; }
    .takeaway-summary { grid-template-columns: 1fr; }
}