/* ============================================
   ЕГЭ-Драйв · Тренажёр · единый стиль
   Палитра: индиго #4F46E5, бирюзовый #14B8A6
   ============================================ */

:root {
    --color-primary: #4F46E5;
    --color-primary-dark: #4338CA;
    --color-primary-light: #EEF2FF;
    --color-accent: #14B8A6;
    --color-accent-dark: #0F766E;
    --color-accent-light: #F0FDFA;

    --color-text: #1F2937;
    --color-text-muted: #6B7280;
    --color-text-light: #9CA3AF;

    --color-bg: #F9FAFB;
    --color-surface: #FFFFFF;
    --color-border: #E5E7EB;
    --color-border-strong: #D1D5DB;

    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(17, 24, 39, 0.06);
    --shadow-lg: 0 10px 30px rgba(17, 24, 39, 0.08);
    --shadow-glow: 0 8px 24px rgba(79, 70, 229, 0.18);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition: 0.2s ease;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

button {
    font-family: inherit;
    cursor: pointer;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============ Header ============ */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.92);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-text);
}

.logo-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: var(--shadow-glow);
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-sub {
    font-size: 11px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.main-nav {
    display: flex;
    gap: 28px;
    align-items: center;
}

.main-nav a {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 15px;
    padding: 8px 0;
    position: relative;
}

.main-nav a:hover {
    color: var(--color-text);
}

.main-nav a.active {
    color: var(--color-primary);
}

.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

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

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    font-weight: 600;
    font-size: 14px;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.btn-accent {
    background: var(--color-accent);
    color: #fff;
}

.btn-accent:hover {
    background: var(--color-accent-dark);
    color: #fff;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border-strong);
}

.btn-outline:hover {
    background: var(--color-bg);
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

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

.btn-ghost:hover {
    color: var(--color-text);
    background: var(--color-bg);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
}

/* ============ Landing ============ */
.hero {
    padding: 80px 0 60px;
    background:
        radial-gradient(ellipse at top right, rgba(20, 184, 166, 0.10) 0%, transparent 50%),
        radial-gradient(ellipse at bottom left, rgba(79, 70, 229, 0.10) 0%, transparent 50%),
        var(--color-bg);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 52px;
    line-height: 1.1;
    margin: 0 0 20px;
    letter-spacing: -0.02em;
}

.hero h1 .accent {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p.lead {
    font-size: 19px;
    color: var(--color-text-muted);
    margin: 0 0 32px;
    max-width: 540px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.hero-stat-num {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.hero-stat-label {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.hero-visual {
    position: relative;
    aspect-ratio: 1 / 1;
}

.hero-card {
    position: absolute;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-lg);
}

.hero-card-1 {
    top: 10%;
    left: 5%;
    width: 55%;
    transform: rotate(-3deg);
}

.hero-card-2 {
    top: 35%;
    right: 0%;
    width: 50%;
    transform: rotate(2deg);
}

.hero-card-3 {
    bottom: 5%;
    left: 20%;
    width: 60%;
    transform: rotate(-1deg);
}

.hero-card-title {
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 14px;
}

.hero-card-meta {
    font-size: 12px;
    color: var(--color-text-muted);
}

.hero-card-tag {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 8px;
}

.hero-card-tag.accent {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header h2 {
    font-size: 36px;
    margin: 0 0 12px;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 17px;
    color: var(--color-text-muted);
    margin: 0;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 20px;
}

.feature-card.accent .feature-icon {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.feature-card h3 {
    margin: 0 0 8px;
    font-size: 18px;
}

.feature-card p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 15px;
}

/* ============ Home (выбор) ============ */
.page-title {
    font-size: 32px;
    margin: 40px 0 8px;
    letter-spacing: -0.01em;
}

.page-subtitle {
    color: var(--color-text-muted);
    font-size: 16px;
    margin: 0 0 36px;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-text-muted);
    margin: 32px 0 0;
}

.breadcrumbs a {
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.breadcrumbs a:hover {
    color: var(--color-primary);
}

.breadcrumb-sep {
    color: var(--color-text-light);
}

.exam-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 56px;
}

.exam-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 20px;
    text-decoration: none;
    color: inherit;
}

.exam-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: inherit;
}

.exam-card-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
}

.exam-card.math .exam-card-icon {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.exam-card.inf .exam-card-icon {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.exam-card-body {
    flex: 1;
}

.exam-card-eyebrow {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.exam-card-title {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 6px;
}

.exam-card-meta {
    font-size: 14px;
    color: var(--color-text-muted);
}

.exam-card-arrow {
    color: var(--color-text-light);
    font-size: 24px;
    transition: transform var(--transition);
}

.exam-card:hover .exam-card-arrow {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* ============ Search bar ============ */
.search-block {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 40px;
}

.search-block-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-muted);
    margin: 0 0 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.search-form {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 12px;
}

.search-input {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: 15px;
    transition: all var(--transition);
    font-family: inherit;
    color: var(--color-text);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* ============ Variant cards (новые варианты) ============ */
.section-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.section-row h2 {
    margin: 0;
    font-size: 22px;
}

.section-row .link {
    font-size: 14px;
    color: var(--color-primary);
    font-weight: 600;
}

.variant-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.variant-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: all var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
}

.variant-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
    color: inherit;
}

.variant-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}

.variant-tag {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.variant-tag.new {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.variant-tag.inf {
    background: #FEF3C7;
    color: #92400E;
}

.variant-date {
    font-size: 12px;
    color: var(--color-text-light);
}

.variant-card-title {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 6px;
}

.variant-card-meta {
    font-size: 13px;
    color: var(--color-text-muted);
    display: flex;
    gap: 12px;
}

.variant-card-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* ============ Variant page (страница решения) ============ */
.variant-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 28px 0;
    margin-bottom: 32px;
}

.variant-header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.variant-header-info h1 {
    margin: 0 0 6px;
    font-size: 26px;
}

.variant-header-meta {
    color: var(--color-text-muted);
    font-size: 14px;
    display: flex;
    gap: 18px;
}

.variant-toolbar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    padding: 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.toolbar-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--color-text-muted);
    padding: 6px 10px;
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.toolbar-checkbox:hover {
    background: var(--color-bg);
}

.toolbar-checkbox input {
    accent-color: var(--color-primary);
}

.variant-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 32px;
    align-items: flex-start;
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.task-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    scroll-margin-top: 100px;
}

.task-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: linear-gradient(to right, var(--color-primary-light), transparent);
    border-bottom: 1px solid var(--color-border);
}

.task-num {
    font-weight: 700;
    color: var(--color-primary-dark);
    font-size: 15px;
}

.task-num .task-type {
    color: var(--color-text-muted);
    font-weight: 500;
}

.task-id {
    font-size: 12px;
    color: var(--color-text-light);
    font-family: ui-monospace, monospace;
}

.task-body {
    padding: 20px 24px;
}

.task-text {
    margin: 0 0 16px;
    font-size: 15px;
    line-height: 1.65;
}

.task-text img,
.task-figure {
    max-width: 100%;
    margin-top: 12px;
    border-radius: var(--radius-md);
}

.task-figure {
    background: var(--color-bg);
    padding: 16px;
    text-align: center;
    color: var(--color-text-muted);
    font-style: italic;
    font-size: 13px;
}

.answer-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed var(--color-border);
    flex-wrap: wrap;
}

.answer-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-muted);
}

.answer-input {
    background: var(--color-bg);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    padding: 8px 14px;
    font-size: 15px;
    width: 200px;
    font-family: inherit;
}

.answer-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.answer-input.correct {
    border-color: var(--color-success);
    background: #ECFDF5;
}

.answer-input.wrong {
    border-color: var(--color-danger);
    background: #FEF2F2;
}

.answer-status {
    font-size: 13px;
    font-weight: 600;
}

.answer-status.correct {
    color: var(--color-success);
}

.answer-status.wrong {
    color: var(--color-danger);
}

.task-actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}

.task-actions .btn-sm {
    font-size: 12px;
    padding: 6px 12px;
}

.task-solution {
    margin-top: 14px;
    padding: 14px 16px;
    background: var(--color-accent-light);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius-sm);
    font-size: 14px;
    display: none;
}

.task-solution.open {
    display: block;
}

.task-solution-title {
    font-weight: 700;
    color: var(--color-accent-dark);
    margin-bottom: 6px;
}

/* sidebar (карта варианта) */
.variant-sidebar {
    position: sticky;
    top: 88px;
}

.sidebar-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 18px;
    margin-bottom: 16px;
}

.sidebar-card-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0 0 12px;
}

.task-map {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.task-map-cell {
    aspect-ratio: 1;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.task-map-cell:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.task-map-cell.answered {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
}

.task-map-cell.correct {
    background: #D1FAE5;
    border-color: var(--color-success);
    color: #065F46;
}

.task-map-cell.wrong {
    background: #FEE2E2;
    border-color: var(--color-danger);
    color: #991B1B;
}

.timer {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    color: var(--color-primary-dark);
    font-variant-numeric: tabular-nums;
    margin: 8px 0;
}

.timer-label {
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: center;
}

.sidebar-progress {
    margin-top: 12px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.progress-bar {
    height: 6px;
    background: var(--color-bg);
    border-radius: 3px;
    overflow: hidden;
    margin: 6px 0;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(to right, var(--color-primary), var(--color-accent));
    transition: width 0.3s ease;
}

/* ============ Catalog (по темам) ============ */
.catalog-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 32px;
}

.tabs {
    display: flex;
    gap: 4px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 4px;
    width: fit-content;
}

.tab {
    padding: 8px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: transparent;
    border: none;
    transition: all var(--transition);
}

.tab.active {
    background: var(--color-primary);
    color: #fff;
}

.task-numbers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
    gap: 8px;
    margin-bottom: 32px;
}

.task-num-cell {
    aspect-ratio: 1;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.task-num-cell:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.constructor-row {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 32px;
}

.constructor-row h3 {
    margin: 0 0 16px;
    font-size: 18px;
}

.constructor-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    margin-top: 16px;
}

.theme-table {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.theme-row {
    display: grid;
    grid-template-columns: 60px 1fr 100px 80px;
    align-items: center;
    padding: 14px 20px;
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
    gap: 16px;
}

.theme-row:last-child {
    border-bottom: none;
}

.theme-row:hover {
    background: var(--color-bg);
}

.theme-row-num {
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 14px;
}

.theme-row-title {
    font-weight: 500;
}

.theme-row-title a {
    color: var(--color-text);
}

.theme-row-title a:hover {
    color: var(--color-primary);
}

.theme-row-count {
    font-size: 13px;
    color: var(--color-text-muted);
    text-align: right;
}

.theme-row-input {
    width: 64px;
    text-align: center;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    font-family: inherit;
    font-size: 14px;
}

.theme-row-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #fff;
}

.theme-table-head {
    display: grid;
    grid-template-columns: 60px 1fr 100px 80px;
    padding: 12px 20px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-text-muted);
    letter-spacing: 0.04em;
    gap: 16px;
}

/* ============ Tutor cabinet ============ */
.tutor-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 32px;
    margin: 32px 0;
}

.tutor-sidebar {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 12px;
    height: fit-content;
    position: sticky;
    top: 88px;
}

.tutor-nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.tutor-nav-item:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.tutor-nav-item.active {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-weight: 600;
}

.tutor-nav-icon {
    width: 18px;
    text-align: center;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 22px;
}

.stat-card-label {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.stat-card-value {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.stat-card-trend {
    font-size: 12px;
    color: var(--color-success);
    font-weight: 600;
}

.stat-card-trend.down {
    color: var(--color-danger);
}

.panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    overflow: hidden;
}

.panel-head {
    padding: 18px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-head h3 {
    margin: 0;
    font-size: 16px;
}

.panel-body {
    padding: 20px 24px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 12px 16px;
    background: var(--color-bg);
    font-size: 12px;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--color-border);
}

.data-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
    font-size: 14px;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover {
    background: var(--color-bg);
}

.score-pill {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.score-pill.high {
    background: #D1FAE5;
    color: #065F46;
}

.score-pill.mid {
    background: #FEF3C7;
    color: #92400E;
}

.score-pill.low {
    background: #FEE2E2;
    color: #991B1B;
}

.chart {
    height: 220px;
    background: linear-gradient(to top, var(--color-primary-light), transparent);
    border-radius: var(--radius-md);
    position: relative;
    padding: 20px;
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

.chart-bar {
    flex: 1;
    background: linear-gradient(to top, var(--color-primary), var(--color-accent));
    border-radius: 4px 4px 0 0;
    min-height: 4px;
    position: relative;
    transition: opacity var(--transition);
}

.chart-bar:hover {
    opacity: 0.85;
}

.chart-bar-label {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--color-text-muted);
}

/* ============ Footer ============ */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 32px 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 14px;
}

/* ============ Responsive ============ */
@media (max-width: 980px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero h1 {
        font-size: 40px;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .exam-grid {
        grid-template-columns: 1fr;
    }

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

    .variant-layout {
        grid-template-columns: 1fr;
    }

    .variant-sidebar {
        position: static;
    }

    .tutor-layout {
        grid-template-columns: 1fr;
    }

    .tutor-sidebar {
        position: static;
        display: flex;
        overflow-x: auto;
    }

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

    .search-form {
        grid-template-columns: 1fr;
    }

    .main-nav {
        display: none;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 16px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .section {
        padding: 48px 0;
    }

    .variant-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .theme-row,
    .theme-table-head {
        grid-template-columns: 40px 1fr 70px;
    }

    .theme-row-input,
    .theme-table-head> :last-child {
        display: none;
    }
}

/* ── Sticky footer + воздух ──────────────────────────────────── */
html,
body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

body>footer,
body>.site-footer {
    margin-top: auto;
}

/* Отступ между контентом и футером — чтоб не прилипал в упор */
.variant-main,
.subject-page {
    padding-bottom: 48px;
}

/* ── Вариант: ширина task-list в свободном режиме ────────────── */
/* В обычном варианте grid 1fr + sidebar остаётся как было.
   В free-mode sidebar убран — растягивать карточки на всю ширину
   некрасиво, ограничиваем по центру. */
.variant-layout--free {
    grid-template-columns: minmax(0, 820px) !important;
    justify-content: center !important;
}

.variant-layout--free .task-list {
    width: 100%;
}

/* ── Шапка задачи (3 блока: № pos · Тип N · # id) ───────────── */
.task-head__dot {
    color: var(--color-text-light);
    margin: 0 4px;
    font-weight: 400;
}

.task-head__type {
    color: var(--color-text-muted);
    font-weight: 500;
}

.task-head__id {
    color: var(--color-text-light);
    font-weight: 400;
    font-family: ui-monospace, monospace;
    font-size: 13px;
}

.task-head__progress {
    color: var(--color-text-light);
    font-size: 13px;
    font-family: ui-monospace, monospace;
}

/* ── Сетка тренировочных вариантов в стиле Ларина ───────────── */
.subject-section__lead {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0 0 16px;
    max-width: 720px;
}

.variant-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
    margin-bottom: 8px;
}

.variant-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    transition: all var(--transition);
}

.variant-cell:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* ── Раскладка конструктора ─────────────────────────────────── */
.constructor-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 24px;
    align-items: start;
}

@media (max-width: 900px) {
    .constructor-layout {
        grid-template-columns: 1fr;
    }
}

.constructor-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin: 0 0 8px;
}

.constructor-title__hint {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 4px;
    font-weight: 700;
}

.constructor-lead {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.55;
    margin: 0 0 20px;
    max-width: 720px;
}

/* ── Таблица ─────────────────────────────────────────────────── */
.cnt-table {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.cnt-table__head {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 16px;
    padding: 10px 20px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-primary);
    letter-spacing: 0.04em;
}

.cnt-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 16px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--color-border);
    align-items: start;
}

.cnt-row:last-child {
    border-bottom: none;
}

.cnt-row:hover {
    background: var(--color-bg);
}

/* ── Счётчик [−] [n] [+] ─────────────────────────────────────── */
.cnt-row__counter {
    display: flex;
    align-items: center;
    gap: 4px;
    height: 32px;
}

.cnt-counter__btn {
    width: 28px;
    height: 28px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    padding: 0;
}

.cnt-counter__btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.cnt-counter__btn:active {
    transform: scale(0.95);
}

.cnt-counter__btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.cnt-counter__btn--sm {
    width: 22px;
    height: 22px;
    font-size: 13px;
}

.cnt-counter__input {
    width: 48px;
    height: 28px;
    text-align: center;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    -moz-appearance: textfield;
    padding: 0;
}

.cnt-counter__input--sm {
    width: 36px;
    height: 22px;
    font-size: 12px;
    font-weight: 500;
}

.cnt-counter__input::-webkit-outer-spin-button,
.cnt-counter__input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.cnt-counter__input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #fff;
}

.cnt-counter__input:disabled {
    color: var(--color-text-light);
    background: var(--color-bg);
}

.cnt-counter__input[readonly] {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    cursor: default;
}

/* ── Заголовок типа ──────────────────────────────────────────── */
.cnt-type-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    background: none;
    border: none;
    padding: 4px 0;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
}

.cnt-type-toggle__chev {
    color: var(--color-text-muted);
    transition: transform 0.18s ease;
    flex-shrink: 0;
}

.cnt-row.is-open .cnt-type-toggle__chev {
    transform: rotate(90deg);
}

.cnt-type-toggle__num {
    font-weight: 700;
    color: var(--color-text);
    font-size: 15px;
}

.cnt-type-toggle__title {
    color: var(--color-text);
    text-decoration: underline;
    text-decoration-color: rgba(79, 70, 229, 0.3);
    text-decoration-style: dotted;
    text-underline-offset: 3px;
    font-size: 15px;
    font-weight: 500;
}

.cnt-type-toggle__title:hover {
    color: var(--color-primary);
    text-decoration-color: var(--color-primary);
}

.cnt-type-toggle__count {
    margin-left: auto;
    font-size: 13px;
    color: var(--color-text-muted);
    padding-left: 12px;
}

/* ── Подтипы ─────────────────────────────────────────────────── */
.cnt-subs {
    list-style: none;
    margin: 8px 0 4px 22px;
    padding: 0;
    flex-direction: column;
    gap: 4px;
}

.cnt-sub {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    padding: 4px 0;
}

.cnt-sub.is-checked .cnt-sub__title {
    color: var(--color-primary-dark);
    font-weight: 500;
}

.cnt-sub__check-wrap {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    flex-shrink: 0;
    position: relative;
}

.cnt-sub__check {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.cnt-sub__check-box {
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-surface);
    display: inline-block;
    position: relative;
    transition: all var(--transition);
}

.cnt-sub__check-wrap:hover .cnt-sub__check-box {
    border-color: var(--color-primary);
}

.cnt-sub__check:checked+.cnt-sub__check-box {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.cnt-sub__check:checked+.cnt-sub__check-box::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 0px;
    width: 5px;
    height: 10px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.cnt-sub__counter {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    flex-shrink: 0;
}

.cnt-sub__title {
    color: var(--color-text);
    text-decoration: underline;
    text-decoration-color: rgba(79, 70, 229, 0.25);
    text-decoration-style: dotted;
    text-underline-offset: 3px;
}

.cnt-sub__title:hover {
    color: var(--color-primary);
    text-decoration-color: var(--color-primary);
}

.cnt-sub__dot {
    color: var(--color-text-light);
}

.cnt-sub__count {
    color: var(--color-text-muted);
    text-decoration: underline;
    text-decoration-style: dotted;
    text-decoration-color: rgba(0, 0, 0, 0.2);
    text-underline-offset: 2px;
    font-size: 13px;
}

/* ── Правая колонка ──────────────────────────────────────────── */
.constructor-side {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
    position: sticky;
    top: 88px;
}

.cnt-side__big {
    font-size: 16px;
    font-weight: 700;
    padding: 14px 16px;
}

.cnt-side__big:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.cnt-side__total {
    font-weight: 500;
    margin-left: 4px;
    opacity: 0.9;
}

.cnt-side__clear {
    color: var(--color-primary);
    background: none;
    border: none;
    padding: 8px;
    text-align: left;
    font-size: 14px;
    cursor: pointer;
    margin-top: 4px;
}

.cnt-side__clear:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.cnt-side__error {
    color: var(--color-danger);
    font-size: 13px;
    padding: 8px 12px;
    background: #FEF2F2;
    border-radius: var(--radius-sm);
    border: 1px solid #FECACA;
}

/* ============================================================
   Страница предмета: шапка, секции, карточки поиска
   ============================================================ */

/* ── Шапка предмета ─────────────────────────────────────────── */
.subject-page {
    padding-top: 24px;
}

.subject-header {
    margin-bottom: 32px;
}

.subject-header__title-row {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-top: 18px;
}

.subject-header__icon {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    line-height: 1;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
}

.subject-header__title {
    margin: 0 0 4px;
    font-size: 30px;
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--color-text);
}

.subject-header__meta {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 14px;
}

.btn--ghost {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid transparent;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn--ghost:hover {
    color: var(--color-text);
    background: var(--color-bg);
}

.btn--sm {
    padding: 6px 12px;
    font-size: 13px;
}

/* ── Секции предмета ────────────────────────────────────────── */
.subject-section {
    margin-bottom: 40px;
}

.subject-section__title {
    margin: 0 0 6px;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

/* ── Поиск: вариант учителя + поиск в каталоге ──────────────── */
.search-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 720px) {
    .search-row {
        grid-template-columns: 1fr;
    }
}

.search-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 22px 24px;
    transition: all var(--transition);
}

.search-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-sm);
}

.search-card__title {
    margin: 0 0 8px;
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text);
}

.search-card__lead {
    margin: 0 0 16px;
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.55;
}

.search-card__form {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.search-card__input {
    flex: 1;
    min-width: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    font-size: 15px;
    font-family: inherit;
    color: var(--color-text);
    transition: all var(--transition);
    /* убираем стрелочки у number */
    -moz-appearance: textfield;
}

.search-card__input::-webkit-outer-spin-button,
.search-card__input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.search-card__input::placeholder {
    color: var(--color-text-light);
}

.search-card__input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* ============================================================
   Страница ошибки 404
   ============================================================ */
.error-page {
    min-height: calc(100vh - 68px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 16px;
    background:
        radial-gradient(ellipse at top right, rgba(20, 184, 166, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at bottom left, rgba(79, 70, 229, 0.08) 0%, transparent 50%),
        var(--color-bg);
}

.error-card {
    max-width: 520px;
    width: 100%;
    text-align: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    box-shadow: var(--shadow-lg);
}

.error-code {
    font-size: 88px;
    line-height: 1;
    font-weight: 800;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin: 0 0 8px;
}

.error-title {
    margin: 0 0 12px;
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.error-message {
    margin: 0 0 28px;
    font-size: 15px;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.error-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 480px) {
    .error-card {
        padding: 36px 24px;
    }

    .error-code {
        font-size: 64px;
    }

    .error-title {
        font-size: 20px;
    }
}

/* ============================================================
   Фикс: task-list должен растягиваться на всю ширину
   grid-колонки 1fr в .variant-layout.
   Без этого карточки задач ужимаются по min-content.
   ============================================================ */
.variant-layout>.task-list {
    width: 100%;
    min-width: 0;
    /* чтобы длинные формулы/картинки не ломали grid */
}

.task-card {
    width: 100%;
}

/* ============================================================
   Жёсткий фикс ширины основной колонки на странице варианта.
   Дублирует свойства layout с !important, чтобы перебить
   возможные переопределения из inline-стилей или конфликтных
   правил. Применяется только к обычному режиму (без --free).
   ============================================================ */
.variant-layout:not(.variant-layout--free) {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) 280px !important;
    gap: 500px !important;
    align-items: flex-start !important;
}

.variant-layout:not(.variant-layout--free)>.task-list {
    width: 100% !important;
    min-width: 0 !important;
}

.variant-layout:not(.variant-layout--free)>.task-list>.task-card {
    width: 250% !important;
}

/* Адаптив: на узких экранах sidebar уходит вниз */
@media (max-width: 980px) {
    .variant-layout:not(.variant-layout--free) {
        grid-template-columns: minmax(0, 1fr) !important;
    }
}

/* ============================================================
   Пустое состояние "Тренировочных вариантов нет за этот месяц"
   ============================================================ */
.subject-section__title-meta {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-left: 6px;
    letter-spacing: 0;
    text-transform: lowercase;
}

.variants-empty {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 20px 22px;
    background: var(--color-surface);
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius-lg);
    max-width: 100%;
}

.variants-empty__icon {
    font-size: 28px;
    line-height: 1;
    margin-bottom: 4px;
}

.variants-empty__title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
}

.variants-empty__hint {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.55;
}