/* ── sdamna100.ru — Main Stylesheet ── */

:root {
    --c-bg: #ffffff;
    --c-bg2: #f7f8fa;
    --c-bg3: #eef1f5;
    --c-text: #1a1a2e;
    --c-text2: #555770;
    --c-text3: #8a8ca5;
    --c-border: #e2e5ec;
    --c-primary: #2563eb;
    --c-primary-light: #dbeafe;
    --c-primary-dark: #1d4ed8;
    --c-accent: #f59e0b;
    --c-accent-light: #fef3c7;
    --c-green: #10b981;
    --c-green-light: #d1fae5;
    --c-red: #ef4444;
    --c-red-light: #fee2e2;
    --c-yellow: #f59e0b;
    --c-yellow-light: #fef3c7;
    --c-blue: #3b82f6;
    --c-ege: #7c3aed;
    --c-ege-light: #ede9fe;
    --c-oge: #0891b2;
    --c-oge-light: #cffafe;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,.08);
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    --max-w: 1080px;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--c-text);
    background: var(--c-bg2);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

code, pre {
    font-family: var(--font-mono);
    background: var(--c-bg3);
    border-radius: 4px;
    font-size: .9em;
}
code { padding: 2px 6px; }
pre { padding: 12px 16px; overflow-x: auto; margin: 8px 0; }

table { border-collapse: collapse; }
td, th { padding: 6px 10px; border: 1px solid var(--c-border); text-align: left; }
th { background: var(--c-bg3); font-weight: 600; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
.page { padding-top: 24px; padding-bottom: 48px; }

/* ── Header ── */
.header {
    background: var(--c-bg);
    border-bottom: 1px solid var(--c-border);
    position: sticky; top: 0; z-index: 100;
}
.header__inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 60px; gap: 16px;
}
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.logo__icon { font-size: 24px; }
.logo__text { font-size: 20px; font-weight: 700; color: var(--c-text); }
.logo__accent { color: var(--c-primary); }

.nav { display: flex; align-items: center; gap: 8px; }
.nav__link {
    padding: 6px 14px; border-radius: var(--radius); color: var(--c-text2);
    font-weight: 500; font-size: .9rem; text-decoration: none; transition: .15s;
}
.nav__link:hover { background: var(--c-bg2); color: var(--c-text); text-decoration: none; }
.nav__link--admin { color: var(--c-primary); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
    display: block; width: 22px; height: 2px; background: var(--c-text2);
    margin: 5px 0; transition: .2s;
}

@media (max-width: 640px) {
    .nav { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0;
           background: var(--c-bg); border-bottom: 1px solid var(--c-border); padding: 12px 20px; gap: 4px; }
    .header__inner.open .nav { display: flex; }
    .nav-toggle { display: block; }
}

/* ── Buttons ── */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 20px; border-radius: var(--radius);
    font-size: .9rem; font-weight: 600; cursor: pointer;
    border: 1.5px solid transparent; transition: .15s;
    text-decoration: none; white-space: nowrap;
}
.btn--primary { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.btn--primary:hover { background: var(--c-primary-dark); text-decoration: none; }
.btn--outline { border-color: var(--c-border); background: var(--c-bg); color: var(--c-text); }
.btn--outline:hover { border-color: var(--c-primary); color: var(--c-primary); text-decoration: none; }
.btn--ghost { background: transparent; color: var(--c-text2); border-color: transparent; padding: 6px 10px; }
.btn--ghost:hover { background: var(--c-bg3); color: var(--c-text); text-decoration: none; }
.btn--sm { padding: 6px 12px; font-size: .82rem; }
.btn--full { width: 100%; justify-content: center; }

/* ── Hero ── */
.hero {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    color: #fff; padding: 60px 0 80px; text-align: center;
}
.hero__title { font-size: 3rem; font-weight: 800; margin-bottom: 12px; }
.hero__title .accent { color: var(--c-accent); }
.hero__sub { font-size: 1.15rem; opacity: .85; margin-bottom: 40px; line-height: 1.7; }

.hero__cards { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }

.exam-card {
    display: flex; flex-direction: column; gap: 8px;
    padding: 28px 32px; border-radius: var(--radius-lg);
    text-decoration: none; color: #fff; min-width: 240px;
    transition: transform .15s, box-shadow .15s; position: relative; overflow: hidden;
}
.exam-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); text-decoration: none; }
.exam-card--ege { background: var(--c-ege); }
.exam-card--oge { background: var(--c-oge); }
.exam-card__badge { font-size: .8rem; font-weight: 700; letter-spacing: 1px; opacity: .7; }
.exam-card__subject { font-size: 1.3rem; font-weight: 700; }
.exam-card__count { font-size: .95rem; opacity: .85; }
.exam-card__detail { font-size: .82rem; opacity: .65; }
.exam-card__arrow { position: absolute; right: 20px; top: 50%; transform: translateY(-50%); font-size: 1.5rem; opacity: .4; }

/* ── Features ── */
.features { padding: 60px 0; }
.features__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; }
.feature {
    background: var(--c-bg); padding: 28px; border-radius: var(--radius-lg);
    box-shadow: var(--shadow); text-align: center;
}
.feature__icon { font-size: 2rem; display: block; margin-bottom: 12px; }
.feature__title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature p { color: var(--c-text2); font-size: .9rem; }

/* ── Breadcrumb ── */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: .85rem; color: var(--c-text3); margin-bottom: 20px; }
.breadcrumb a { color: var(--c-text2); }

/* ── Page header ── */
.page-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.page-header h1 { font-size: 1.6rem; font-weight: 700; }
.page-header__count { color: var(--c-text3); font-size: .9rem; }

/* ── Exam toggle ── */
.exam-toggle { display: flex; gap: 4px; background: var(--c-bg3); border-radius: var(--radius); padding: 3px; }
.exam-toggle__btn {
    padding: 6px 18px; border-radius: 7px; font-size: .85rem; font-weight: 600;
    color: var(--c-text2); text-decoration: none; transition: .15s;
}
.exam-toggle__btn.active { background: var(--c-bg); color: var(--c-text); box-shadow: var(--shadow); }
.exam-toggle__btn:hover { text-decoration: none; }

/* ── Topics grid ── */
.topics-grid { display: flex; flex-direction: column; gap: 8px; }
.topic-card {
    display: flex; align-items: center; gap: 16px;
    background: var(--c-bg); padding: 16px 20px; border-radius: var(--radius);
    box-shadow: var(--shadow); text-decoration: none; color: var(--c-text);
    transition: .15s; border: 1.5px solid transparent;
}
.topic-card:hover { border-color: var(--c-primary); box-shadow: var(--shadow-md); text-decoration: none; }
.topic-card__number {
    width: 48px; height: 48px; border-radius: var(--radius);
    background: var(--c-primary-light); color: var(--c-primary);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: .9rem; flex-shrink: 0;
}
.topic-card__body { flex: 1; }
.topic-card__title { font-weight: 600; font-size: .95rem; }
.topic-card__count { font-size: .82rem; color: var(--c-text3); }
.topic-card__arrow { color: var(--c-text3); font-size: 1.2rem; }

/* ── Tasks list ── */
.tasks-list { display: flex; flex-direction: column; gap: 8px; }
.task-preview {
    background: var(--c-bg); border-radius: var(--radius); box-shadow: var(--shadow);
    border: 1.5px solid transparent; transition: .15s;
}
.task-preview:hover { border-color: var(--c-primary-light); }
.task-preview__link { display: block; padding: 16px 20px; text-decoration: none; color: var(--c-text); }
.task-preview__link:hover { text-decoration: none; }
.task-preview__header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }
.task-preview__num { font-weight: 700; font-size: .85rem; color: var(--c-primary); }
.task-preview__meta { font-size: .8rem; color: var(--c-text3); }
.task-preview__body { font-size: .9rem; color: var(--c-text2); line-height: 1.5; overflow: hidden; max-height: 3.6em; }
.task-preview__body p { margin: 0; }
.task-preview__body table { font-size: .8em; }

/* ── Difficulty ── */
.difficulty { font-size: .8rem; letter-spacing: 1px; color: var(--c-accent); }

/* ── Task detail ── */
.task-full { background: var(--c-bg); border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 32px; }
.task-full__header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 8px; }
.task-full__badges { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.task-full__content { font-size: 1rem; line-height: 1.7; margin-bottom: 28px; }
.task-full__content p { margin-bottom: 10px; }
.task-full__content table { margin: 12px 0; }
.task-full__content pre { background: var(--c-bg3); padding: 16px; border-radius: var(--radius); }
.task-full__content ul, .task-full__content ol { margin: 8px 0 8px 24px; }

.badge {
    display: inline-flex; align-items: center; padding: 4px 10px;
    border-radius: 6px; font-size: .78rem; font-weight: 600;
}
.badge--exam { background: var(--c-ege-light); color: var(--c-ege); }
.badge--num { background: var(--c-primary-light); color: var(--c-primary); }
.badge--source { background: var(--c-bg3); color: var(--c-text2); }

/* ── Answer section ── */
.answer-section {
    background: var(--c-bg2); border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
}
.answer-form__label { font-weight: 600; margin-bottom: 10px; display: block; }
.answer-form__row { display: flex; gap: 10px; }
.answer-form__input {
    flex: 1; padding: 10px 16px; border: 1.5px solid var(--c-border);
    border-radius: var(--radius); font-size: 1rem; font-family: var(--font-mono);
    outline: none; transition: .15s;
}
.answer-form__input:focus { border-color: var(--c-primary); box-shadow: 0 0 0 3px var(--c-primary-light); }

.answer-result__verdict {
    font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; padding: 12px;
    border-radius: var(--radius);
}
.answer-result__verdict.correct { background: var(--c-green-light); color: #065f46; }
.answer-result__verdict.incorrect { background: var(--c-red-light); color: #991b1b; }
.answer-result__details { margin-bottom: 16px; color: var(--c-text2); }
.answer-result__details p { margin: 4px 0; }

/* ── Explanation ── */
.explanation { margin-bottom: 24px; }
.explanation__toggle {
    background: none; border: 1.5px dashed var(--c-border); padding: 12px 20px;
    border-radius: var(--radius); cursor: pointer; width: 100%;
    font-size: .9rem; color: var(--c-primary); font-weight: 600; transition: .15s;
}
.explanation__toggle:hover { border-color: var(--c-primary); background: var(--c-primary-light); }
.explanation__body {
    margin-top: 16px; padding: 20px; background: var(--c-accent-light);
    border-radius: var(--radius); line-height: 1.7;
}
.explanation__body p { margin-bottom: 8px; }

.task-nav { display: flex; gap: 12px; padding-top: 20px; border-top: 1px solid var(--c-border); }

/* ── Pagination ── */
.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 24px; }
.pagination__btn { padding: 8px 16px; border-radius: var(--radius); background: var(--c-bg); box-shadow: var(--shadow); font-weight: 600; font-size: .85rem; }
.pagination__btn:hover { text-decoration: none; box-shadow: var(--shadow-md); }
.pagination__info { color: var(--c-text3); font-size: .85rem; }

/* ── Login ── */
.login-box {
    max-width: 400px; margin: 60px auto; background: var(--c-bg);
    padding: 36px; border-radius: var(--radius-lg); box-shadow: var(--shadow-md);
}
.login-box h1 { font-size: 1.4rem; margin-bottom: 4px; }
.login-box__sub { color: var(--c-text3); margin-bottom: 24px; font-size: .9rem; }
.login-box__footer { text-align: center; margin-top: 20px; font-size: .85rem; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: .85rem; margin-bottom: 6px; color: var(--c-text2); }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 10px 14px; border: 1.5px solid var(--c-border);
    border-radius: var(--radius); font-size: .9rem; font-family: var(--font);
    background: var(--c-bg); outline: none; transition: .15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--c-primary); box-shadow: 0 0 0 3px var(--c-primary-light);
}
.form-group textarea { resize: vertical; font-family: var(--font-mono); }

.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.form-actions { display: flex; gap: 12px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--c-border); }

/* ── Alerts ── */
.alert { padding: 12px 16px; border-radius: var(--radius); font-size: .9rem; margin-bottom: 16px; }
.alert--error { background: var(--c-red-light); color: #991b1b; }
.alert--success { background: var(--c-green-light); color: #065f46; }

/* ── Preview box ── */
.preview-box {
    background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius);
    padding: 16px; min-height: 60px; font-size: .9rem; line-height: 1.6;
}
.preview-box table { font-size: .85em; }

/* ── Admin stats ── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 32px; }
.stat-card {
    background: var(--c-bg); padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow);
    text-align: center; border-top: 3px solid var(--c-border);
}
.stat-card--green { border-top-color: var(--c-green); }
.stat-card--yellow { border-top-color: var(--c-yellow); }
.stat-card--blue { border-top-color: var(--c-blue); }
.stat-card--gray { border-top-color: var(--c-text3); }
.stat-card__value { display: block; font-size: 2rem; font-weight: 800; color: var(--c-text); }
.stat-card__label { font-size: .82rem; color: var(--c-text3); }

/* ── Admin actions ── */
.admin-actions h2 { font-size: 1.2rem; margin-bottom: 16px; }
.admin-actions__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.admin-action-card {
    display: flex; flex-direction: column; gap: 4px;
    background: var(--c-bg); padding: 20px; border-radius: var(--radius);
    box-shadow: var(--shadow); text-decoration: none; color: var(--c-text);
    border: 1.5px solid transparent; transition: .15s;
}
.admin-action-card:hover { border-color: var(--c-primary); text-decoration: none; }
.admin-action-card--accent { border-color: var(--c-primary-light); background: var(--c-primary-light); }
.admin-action-card__icon { font-size: 1.5rem; }
.admin-action-card__title { font-weight: 600; font-size: .95rem; }
.admin-action-card__desc { font-size: .82rem; color: var(--c-text3); }

/* ── Admin table ── */
.admin-table-wrap { overflow-x: auto; }
.admin-table { width: 100%; background: var(--c-bg); border-radius: var(--radius); box-shadow: var(--shadow); }
.admin-table th { font-size: .78rem; text-transform: uppercase; letter-spacing: .5px; color: var(--c-text3); border: none; border-bottom: 1px solid var(--c-border); padding: 12px 14px; }
.admin-table td { border: none; border-bottom: 1px solid var(--c-border); padding: 10px 14px; font-size: .88rem; }
.admin-table tr:hover td { background: var(--c-bg2); }
.admin-table__topic { max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.status-badge {
    display: inline-block; padding: 2px 8px; border-radius: 4px;
    font-size: .75rem; font-weight: 600;
}
.status-badge--published { background: var(--c-green-light); color: #065f46; }
.status-badge--draft { background: var(--c-bg3); color: var(--c-text3); }
.status-badge--moderation { background: var(--c-yellow-light); color: #92400e; }
.status-badge--archived { background: var(--c-bg3); color: var(--c-text3); }

/* ── Filter pills ── */
.filters { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.filter-pills { display: flex; gap: 4px; }
.pill {
    padding: 6px 14px; border-radius: 20px; font-size: .82rem; font-weight: 500;
    color: var(--c-text2); text-decoration: none; background: var(--c-bg);
    border: 1px solid var(--c-border); transition: .15s;
}
.pill.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.pill:hover { text-decoration: none; border-color: var(--c-primary); }

/* ── Empty state ── */
.empty-state { text-align: center; padding: 60px 20px; color: var(--c-text3); }
.empty-state p { margin-bottom: 20px; font-size: 1.1rem; }

/* ── Footer ── */
.footer {
    background: var(--c-bg); border-top: 1px solid var(--c-border);
    padding: 24px 0; margin-top: auto; text-align: center;
}
.footer p { font-size: .85rem; color: var(--c-text2); }
.footer__sub { font-size: .78rem; color: var(--c-text3); margin-top: 4px; }

/* ── Task form specific ── */
.task-form { background: var(--c-bg); padding: 28px; border-radius: var(--radius-lg); box-shadow: var(--shadow); }