/* ============ БАЗОВЫЕ ПЕРЕМЕННЫЕ (СВЕТЛАЯ ТЕМА) ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root,
[data-theme="light"] {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

    --bg: #f1f5f9;
    --surface: #ffffff;
    --surface-hover: #f8fafc;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.06);
    --shadow-lg: rgba(0, 0, 0, 0.1);

    --header-bg: #ffffff;
    --footer-bg: #ffffff;
    --input-bg: #ffffff;
    --table-header: #f8fafc;
    --table-row-hover: #f8fafc;
}

/* ============ ТЁМНАЯ ТЕМА ============ */
[data-theme="dark"] {
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --secondary: #f472b6;
    --success: #34d399;
    --danger: #f87171;
    --warning: #fbbf24;

    --bg: #0f172a;
    --surface: #1e293b;
    --surface-hover: #273449;
    --text: #e2e8f0;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);

    --header-bg: #1e293b;
    --footer-bg: #1e293b;
    --input-bg: #0f172a;
    --table-header: #273449;
    --table-row-hover: #273449;
}

/* Плавный переход между темами */
body, .header, .card, .footer, .form-container, .table, input, .option, .stat-card {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ============ БАЗОВЫЕ СТИЛИ ============ */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

/* ============ HEADER ============ */
.header {
    background: var(--header-bg);
    box-shadow: 0 1px 3px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    gap: 12px;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.logo span { color: var(--primary); }

.nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    white-space: nowrap;
}

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

/* Переключатель темы */
.theme-toggle {
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.2s;
    flex-shrink: 0;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: var(--primary);
    border-color: var(--primary);
}

.theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: inline; }

/* Бургер */
.burger {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    padding: 8px;
    position: relative;
    z-index: 110;
}

.burger span {
    display: block;
    height: 3px;
    background: var(--text);
    border-radius: 3px;
    margin: 5px 0;
    transition: all 0.3s;
}

.burger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ============ BUTTONS ============ */
.btn {
    display: inline-block;
    padding: 11px 22px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-family: inherit;
    touch-action: manipulation;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99,102,241,0.4);
}

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary) !important;
    padding: 9px 20px;
    background: transparent;
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff !important;
}

.btn-block { width: 100%; }

/* ============ MAIN ============ */
main { flex: 1; padding: 40px 0; }

/* ============ HERO ============ */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    padding: 80px 20px;
    text-align: center;
    border-radius: 0 0 40px 40px;
    margin-bottom: 60px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 20px;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto 30px;
}

.hero .btn {
    padding: 14px 36px;
    font-size: 17px;
    background: #fff;
    color: var(--primary) !important;
}

/* ============ GRID / CARDS ============ */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.card {
    background: var(--surface);
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 2px 8px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s, background-color 0.3s;
    border: 2px solid transparent;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px var(--shadow-lg);
    border-color: var(--primary);
}

.card-icon { font-size: 40px; margin-bottom: 16px; }

.card h3 { font-size: 20px; margin-bottom: 10px; color: var(--text); }

.card p { color: var(--text-secondary); margin-bottom: 20px; font-size: 15px; }

/* ============ FORMS ============ */
.form-container {
    max-width: 420px;
    margin: 40px auto;
    background: var(--surface);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--shadow);
}

.form-container h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
    color: var(--text);
}

.form-group { margin-bottom: 20px; }

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 16px; /* 16px предотвращает зум на iOS */
    font-family: inherit;
    transition: border-color 0.2s, background-color 0.3s, color 0.3s;
    background: var(--input-bg);
    color: var(--text);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error { background: #fee2e2; color: #991b1b; }
.alert-success { background: #d1fae5; color: #065f46; }

[data-theme="dark"] .alert-error { background: #7f1d1d; color: #fecaca; }
[data-theme="dark"] .alert-success { background: #064e3b; color: #a7f3d0; }

/* ============ STATS ============ */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--surface);
    padding: 24px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 2px 8px var(--shadow);
}

.stat-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

/* ============ QUESTION ============ */
.question {
    background: var(--surface);
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 2px 8px var(--shadow);
    margin-bottom: 24px;
    scroll-margin-top: 80px;
}

.question h3 {
    margin-bottom: 24px;
    font-size: 19px;
    line-height: 1.4;
    color: var(--text);
}

.options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border: 2px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--surface);
    color: var(--text);
    -webkit-tap-highlight-color: transparent;
    min-height: 56px; /* удобно для пальца */
}

.option:hover {
    border-color: var(--primary);
    background: var(--surface-hover);
}

.option input { cursor: pointer; }

.option.selected {
    border-color: var(--primary);
    background: var(--surface-hover);
}

.option-letter {
    font-weight: 700;
    color: var(--primary);
    min-width: 24px;
    flex-shrink: 0;
}

/* ============ PROGRESS ============ */
.progress-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 30px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s;
}

/* ============ RESULT ============ */
.result-box {
    text-align: center;
    padding: 60px 40px;
    background: var(--surface);
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.result-score {
    font-size: 80px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.result-message {
    font-size: 20px;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

/* ============ TABLE ============ */
.table-wrap { overflow-x: auto; border-radius: 16px; }

.table {
    width: 100%;
    min-width: 500px;
    background: var(--surface);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 2px 8px var(--shadow);
    border-collapse: collapse;
    color: var(--text);
}

.table th, .table td {
    padding: 14px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    background: var(--table-header);
    font-weight: 600;
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.table tbody tr:hover { background: var(--table-row-hover); }

/* ============ FOOTER ============ */
.footer {
    background: var(--footer-bg);
    padding: 24px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 60px;
}

.page-title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 30px;
    color: var(--text);
}

.text-center { text-align: center; }

/* ============================================================
   МОБИЛЬНАЯ АДАПТАЦИЯ
   ============================================================ */
@media (max-width: 860px) {
    /* Бургер включается */
    .burger { display: block; }

    /* Навигация выезжает сверху */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: min(85vw, 340px);
        height: 100vh;
        background: var(--surface);
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        padding: 90px 24px 24px;
        gap: 8px;
        box-shadow: -8px 0 30px var(--shadow-lg);
        transition: right 0.3s ease;
        z-index: 105;
        overflow-y: auto;
    }

    .nav.open { right: 0; }

    .nav a {
        padding: 14px 16px;
        border-radius: 12px;
        font-size: 17px;
        background: var(--surface-hover);
        text-align: center;
    }

    .nav a.btn {
        padding: 14px 16px;
        width: 100%;
    }

    /* Затемнение фона при открытом меню */
    .nav.open::before {
        content: '';
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
        right: 100%;
        width: 100vw;
    }

    .theme-toggle {
        align-self: center;
        margin-top: 12px;
    }

    /* Главный экран */
    .hero {
        padding: 50px 16px;
        border-radius: 0 0 24px 24px;
        margin-bottom: 32px;
    }

    .hero h1 { font-size: 30px; }
    .hero p { font-size: 16px; }
    .hero .btn { padding: 12px 28px; font-size: 16px; }

    main { padding: 24px 0; }

    .container { padding: 0 16px; }

    .page-title { font-size: 24px; margin-bottom: 20px; }

    .grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .card { padding: 20px; }

    .form-container {
        padding: 28px 20px;
        margin: 20px auto;
        border-radius: 16px;
    }

    .form-container h2 { font-size: 24px; }

    .stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stat-card { padding: 16px 12px; }

    .stat-value { font-size: 28px; }
    .stat-label { font-size: 12px; }

    .question { padding: 20px; }

    .question h3 { font-size: 17px; margin-bottom: 16px; }

    .option {
        padding: 14px 16px;
        font-size: 15px;
    }

    .result-box { padding: 40px 20px; }

    .result-score { font-size: 60px; }
    .result-message { font-size: 17px; }

    .table th, .table td { padding: 12px 14px; font-size: 14px; }
}

/* Очень маленькие экраны */
@media (max-width: 400px) {
    .logo { font-size: 18px; }
    .hero h1 { font-size: 26px; }
    .stats { grid-template-columns: 1fr; }
    .result-score { font-size: 48px; }
}

/* Убираем hover-эффекты на тач-устройствах */
@media (hover: none) {
    .card:hover { transform: none; box-shadow: 0 2px 8px var(--shadow); border-color: transparent; }
    .btn-primary:hover { transform: none; }
    .option:hover { background: var(--surface); }
}

/* Улучшенный скроллбар */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }