/* ==================== БАЗОВЫЕ СТИЛИ ==================== */
:root {
    --bg: #F4F6F9;
    --surface: #FFFFFF;
    --primary: #4F6BED;
    --primary-hover: #3D56D4;
    --primary-light: #EEF1FD;
    --success: #2EAF6A;
    --success-bg: #EAFAF1;
    --danger: #E74C3C;
    --danger-bg: #FDEDEC;
    --warning: #F39C12;
    --warning-bg: #FEF9E7;
    --text: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --header-dark: #1E293B;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
}

/* ==================== НАВБАР ==================== */
.navbar {
    background: var(--header-dark);
    padding: 0 24px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-logo {
    color: white;
    font-weight: 700;
    font-size: 15px;
    text-decoration: none;
}

.nav-right { display: flex; align-items: center; gap: 16px; }
.nav-user { color: #CBD5E1; font-size: 13px; }
.nav-link { color: #94A3B8; font-size: 13px; text-decoration: none; }
.nav-link:hover { color: white; }

/* ==================== КНОПКИ ==================== */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.15s;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-dark { background: var(--header-dark); color: white; }
.btn-outline { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-outline:hover { background: var(--bg); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 14px; font-size: 12px; }

/* ==================== ФОРМЫ ==================== */
.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    background: #F8FAFC;
    transition: border-color 0.15s;
}
.form-input:focus { outline: none; border-color: var(--primary); background: white; }
.form-input--mono { font-family: 'Consolas', 'Courier New', monospace; font-size: 15px; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; color: var(--text-secondary); }
.required { color: var(--danger); }
.form-link { display: block; text-align: center; margin-top: 16px; color: var(--primary); text-decoration: none; font-size: 13px; }

/* ==================== КАРТОЧКИ ==================== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}

/* ==================== TOAST ==================== */
#toast-container {
    position: fixed;
    top: 64px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: 8px;
    border-left: 4px solid;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 280px;
    max-width: 420px;
    box-shadow: var(--shadow-md);
    animation: toastIn 0.3s ease;
}
.toast--success { background: var(--success-bg); border-color: var(--success); color: #065F46; }
.toast--error { background: var(--danger-bg); border-color: var(--danger); color: #991B1B; }
.toast--warning { background: var(--warning-bg); border-color: var(--warning); color: #92400E; }
.toast--info { background: var(--primary-light); border-color: var(--primary); color: #1E40AF; }

.toast-close { margin-left: auto; cursor: pointer; opacity: 0.6; font-size: 16px; }
.toast-close:hover { opacity: 1; }

@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: none; } }

/* ==================== СТРАНИЦА ЛОГИНА ==================== */
.login-page {
    min-height: calc(100vh - 52px);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--header-dark);
    padding: 20px;
}
.login-card {
    background: var(--surface);
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-md);
}
.login-title { font-size: 20px; text-align: center; margin-bottom: 4px; }
.login-subtitle { text-align: center; color: var(--text-muted); font-size: 13px; margin-bottom: 28px; }
.form-heading { font-size: 16px; margin-bottom: 20px; text-align: center; }

/* ==================== ГЛАВНОЕ МЕНЮ ==================== */
.menu-page { max-width: 960px; margin: 0 auto; padding: 20px; }
.menu-header { text-align: center; padding: 30px 0 20px; }
.menu-header h1 { font-size: 24px; }
.menu-header p { color: var(--text-secondary); margin-top: 4px; }

.menu-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-bottom: 30px; }

.menu-card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-decoration: none;
    color: inherit;
    transition: all 0.15s;
}
.menu-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }

.card-accent { height: 4px; width: 50px; border-radius: 2px; margin-bottom: 18px; }
.card-icon { font-size: 32px; margin-bottom: 8px; }
.menu-card h3 { font-size: 16px; margin-bottom: 6px; }
.menu-card p { color: var(--text-secondary); font-size: 13px; margin-bottom: 16px; flex-grow: 1; }
.menu-card .btn { align-self: flex-start; }

.card-progress { margin-bottom: 16px; }
.card-stat { color: var(--text-muted); font-size: 12px; margin-bottom: 12px; }

.progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 4px;
}
.progress-fill {
    height: 100%;
    background: var(--success);
    border-radius: 3px;
    transition: width 0.3s;
}
.progress-text { font-size: 12px; color: var(--text-muted); }

.progress-bar--header { width: 120px; }
.progress-bar--small { width: 100px; }
.progress-text-light { color: rgba(255,255,255,0.7); font-size: 12px; }

.menu-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 40px;
}
.stat-item { text-align: center; }
.stat-num { display: block; font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 12px; color: var(--text-secondary); }

/* ==================== ВАРИАНТЫ ==================== */
.variants-page { max-width: 1200px; margin: 0 auto; padding: 0 20px 20px; }

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    color: white;
}
.page-header--success { background: var(--success); }
.page-header--primary { background: var(--primary); }
.page-header h2 { font-size: 16px; }
.header-right { display: flex; align-items: center; gap: 12px; }

.group-section { margin-bottom: 16px; }
.group-header { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; font-size: 14px; }
.group-dot { font-size: 12px; }
.group-title { color: var(--text-secondary); font-weight: 400; }
.group-divider { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

.variant-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
}

.variant-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
    text-decoration: none;
    color: inherit;
    transition: all 0.12s;
    position: relative;
}
.variant-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.variant-card--done { background: #F0FFF4; border-color: #A7F3D0; }

.variant-accent { height: 3px; border-radius: 2px; margin-bottom: 10px; }
.variant-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.variant-name { font-weight: 700; font-size: 13px; }
.variant-check { color: var(--success); font-weight: 700; font-size: 16px; }

.variant-params { display: flex; align-items: center; gap: 8px; }
.variant-pressure { font-size: 12px; color: var(--text-secondary); }
.variant-regulation { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}
.badge-primary { background: var(--primary); color: white; }
.badge-success { background: var(--success); color: white; }
.badge-outline { background: var(--bg); color: var(--text); }

/* ==================== ЭКРАН ЗАДАНИЯ ==================== */
.task-page { display: flex; flex-direction: column; height: calc(100vh - 52px); }

.task-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--header-dark);
    padding: 10px 20px;
    color: white;
}
.task-header--test { background: #7F1D1D; }
.header-title { font-size: 14px; font-weight: 600; }

.test-progress-dots { display: flex; gap: 4px; margin-left: 16px; }
.dot { width: 36px; height: 5px; border-radius: 3px; background: #444; }
.dot--active { background: var(--danger); }
.task-header-left { display: flex; align-items: center; }
.task-header-right { display: flex; align-items: center; }

.timer { font-size: 20px; font-weight: 700; color: #FF6B6B; font-family: 'Consolas', monospace; }

.task-body { display: flex; flex: 1; overflow: hidden; padding: 12px; gap: 12px; }

.task-left { width: 460px; min-width: 380px; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; }
.task-right { flex: 1; display: flex; }

.schema-card { display: flex; flex-direction: column; flex: 1; padding: 12px; }
.schema-title { font-size: 13px; font-weight: 600; margin-bottom: 8px; }
.schema-container { flex: 1; display: flex; align-items: center; justify-content: center; overflow: hidden; position: relative; }
#schemaCanvas { cursor: crosshair; max-width: 100%; max-height: 100%; }
.schema-hint { font-size: 11px; color: var(--text-muted); text-align: center; margin-top: 6px; }

.card-badges { display: flex; gap: 6px; margin-bottom: 12px; }
.params-box { padding: 12px; border-radius: 6px; font-size: 13px; font-weight: 600; margin-bottom: 12px; line-height: 1.8; }
.condition-label { font-size: 12px; font-weight: 600; color: var(--text-secondary); margin-bottom: 4px; }
.condition-text { font-size: 13px; line-height: 1.6; color: var(--text); padding: 10px; background: #FAFBFC; border: 1px solid var(--border); border-radius: 6px; }

.answer-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.answer-header h3 { font-size: 16px; }
.attempt-counter { font-size: 12px; color: var(--text-muted); }
.answer-hint { font-size: 12px; color: var(--text-secondary); margin-bottom: 10px; }
.answer-buttons { display: flex; gap: 8px; margin-top: 10px; }
.hint-row { display: flex; align-items: center; gap: 12px; margin-top: 10px; }
.hint-dots { display: flex; align-items: center; gap: 4px; font-size: 12px; color: var(--text-muted); }
.hdot { font-size: 16px; }
.hdot--active { color: var(--warning); }

#resultArea { margin-top: 12px; }
.result-msg {
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 13px;
    line-height: 1.5;
    white-space: pre-line;
}
.result-msg--success { background: var(--success-bg); color: #065F46; }
.result-msg--warning { background: var(--warning-bg); color: #92400E; }
.result-msg--error { background: var(--danger-bg); color: #991B1B; }

.task-nav {
    display: flex;
    justify-content: space-between;
    padding: 10px 16px;
    border-top: 1px solid var(--border);
    background: var(--surface);
}

/* ==================== РЕЗУЛЬТАТ ТЕСТА ==================== */
.result-page { display: flex; justify-content: center; padding: 40px 20px; }
.result-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; max-width: 560px; width: 100%; text-align: center; }
.result-card h2 { font-size: 18px; margin-bottom: 4px; }
.result-student { font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; }
.result-motivation { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }

.grade-badge { display: inline-block; padding: 16px 32px; border-radius: var(--radius); color: white; font-size: 20px; font-weight: 700; margin-bottom: 24px; }

.result-stats { display: flex; justify-content: center; gap: 32px; margin-bottom: 24px; }
.result-detail { display: flex; align-items: center; gap: 8px; padding: 6px 0; font-size: 14px; text-align: left; }
.result-actions { margin-top: 24px; }

.violations-box {
    background: var(--danger-bg);
    border: 1px solid #FECACA;
    border-radius: 8px;
    padding: 14px;
    margin-bottom: 16px;
    text-align: left;
}
.violations-box h4 { color: var(--danger); font-size: 13px; margin-bottom: 6px; }
.violation-item { font-size: 12px; color: #991B1B; }

/* ==================== ТАБЛИЦА РЕЗУЛЬТАТОВ ==================== */
.results-page { max-width: 1200px; margin: 0 auto; padding: 0 20px 20px; }
.table-wrap { overflow-x: auto; }

.results-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.results-table th { background: var(--bg); padding: 10px 12px; text-align: left; font-weight: 600; font-size: 12px; color: var(--text-secondary); border-bottom: 2px solid var(--border); }
.results-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.results-table tr:hover td { background: #F8FAFC; }
.results-table a { color: var(--primary); text-decoration: none; }

.progress-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 10px; margin-top: 10px; }
.student-progress-item { display: flex; align-items: center; gap: 8px; font-size: 13px; padding: 6px 0; }
.sp-name { font-weight: 600; min-width: 140px; }
.sp-group { color: var(--text-muted); font-size: 12px; min-width: 60px; }
.sp-count { font-size: 12px; color: var(--text-secondary); }

.empty-state { text-align: center; padding: 60px 20px; }
.empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state h3 { color: var(--text-secondary); }
.empty-state p { color: var(--text-muted); font-size: 13px; }

/* ==================== УТИЛИТЫ ==================== */
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-primary { color: var(--primary); }

/* ==================== АДАПТИВНОСТЬ ==================== */
@media (max-width: 768px) {
    .task-body { flex-direction: column; }
    .task-left { width: 100%; min-width: 0; }
    .menu-stats { flex-wrap: wrap; gap: 20px; }
    .variant-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .result-stats { flex-wrap: wrap; }
    .results-table { font-size: 12px; }
}