/* ===== ПЕРЕМЕННЫЕ ТЕМ ===== */
:root,
[data-theme="light"] {
    --color-bg: #f7f7f7;
    --color-surface: #ffffff;
    --color-surface-hover: #fafafa;
    --color-text: #333333;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-border: #e8e8e8;
    --color-border-hover: #d0d0d0;
    --color-accent: #ff6b00;
    --color-accent-hover: #e65c00;
    --color-accent-light: rgba(255, 107, 0, 0.08);
    --color-secondary: #4caf50;
    --color-secondary-hover: #43a047;
    --color-secondary-light: rgba(76, 175, 80, 0.08);
    --color-shadow: rgba(0, 0, 0, 0.06);
    --color-shadow-hover: rgba(0, 0, 0, 0.1);
    --color-header-bg: #ffffff;
    --color-footer-bg: #ffffff;
    --color-info-bg: #fff8e1;
    --color-info-border: #ffe082;
    --color-info-text: #856404;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 4px var(--color-shadow);
    --shadow-md: 0 2px 12px var(--color-shadow);
    --shadow-lg: 0 4px 20px var(--color-shadow);
    --transition: 0.2s ease;
}

[data-theme="dark"] {
    --color-bg: #1a1a1a;
    --color-surface: #2a2a2a;
    --color-surface-hover: #333333;
    --color-text: #e8e8e8;
    --color-text-secondary: #b0b0b0;
    --color-text-muted: #888888;
    --color-border: #404040;
    --color-border-hover: #505050;
    --color-accent: #ff8c33;
    --color-accent-hover: #ff9955;
    --color-accent-light: rgba(255, 140, 51, 0.12);
    --color-secondary: #66bb6a;
    --color-secondary-hover: #81c784;
    --color-secondary-light: rgba(102, 187, 106, 0.12);
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-hover: rgba(0, 0, 0, 0.4);
    --color-header-bg: #2a2a2a;
    --color-footer-bg: #2a2a2a;
    --color-info-bg: #3a3520;
    --color-info-border: #5a5030;
    --color-info-text: #d4c580;
}

/* ===== БАЗОВЫЕ СТИЛИ ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition), color var(--transition);
}

/* ===== КОНТЕЙНЕР ===== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== ШАПКА ===== */
.header {
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition), border-color var(--transition);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}

.logo__icon {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
}

.logo__text {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: -0.3px;
}

/* ===== ПЕРЕКЛЮЧАТЕЛЬ ТЕМЫ ===== */
.theme-toggle {
    background: none;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.theme-toggle__icon {
    width: 20px;
    height: 20px;
    position: absolute;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-toggle__icon--sun {
    opacity: 0;
    transform: rotate(90deg);
}

.theme-toggle__icon--moon {
    opacity: 1;
    transform: rotate(0);
}

[data-theme="dark"] .theme-toggle__icon--sun {
    opacity: 1;
    transform: rotate(0);
}

[data-theme="dark"] .theme-toggle__icon--moon {
    opacity: 0;
    transform: rotate(-90deg);
}

/* ===== ОСНОВНОЙ КОНТЕНТ ===== */
.main {
    flex: 1;
    padding: 40px 0 60px;
}

/* ===== ГЕРОЙ-СЕКЦИЯ ===== */
.hero {
    text-align: center;
    margin-bottom: 50px;
    padding: 20px 0;
}

.hero__title {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    line-height: 1.2;
    transition: color var(--transition);
}

.hero__subtitle {
    font-size: clamp(16px, 2.5vw, 18px);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
    transition: color var(--transition);
}

/* ===== КАРТОЧКИ СЕРВИСОВ ===== */
.services {
    margin-bottom: 50px;
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

/* ===== КАРТОЧКА СЕРВИСА ===== */
.service-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-accent);
    opacity: 0;
    transition: opacity var(--transition);
}

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

.service-card:hover::before {
    opacity: 1;
}

/* Цветовые акценты для карточек */
.service-card--compare::before {
    background: var(--color-accent);
}

.service-card--compare:hover {
    border-color: var(--color-accent);
}

.service-card--bti::before {
    background: var(--color-secondary);
}

.service-card--bti:hover {
    border-color: var(--color-secondary);
}

/* Иконка карточки */
.service-card__icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.service-card--bti .service-card__icon {
    background: var(--color-secondary-light);
    color: var(--color-secondary);
}

.service-card__icon svg {
    width: 28px;
    height: 28px;
}

/* Заголовок карточки */
.service-card__title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--color-text);
    line-height: 1.3;
    transition: color var(--transition);
}

/* Описание карточки */
.service-card__desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
    transition: color var(--transition);
}

/* Список возможностей */
.service-card__features {
    list-style: none;
    margin-bottom: 20px;
}

.service-card__features li {
    font-size: 13px;
    color: var(--color-text-secondary);
    padding: 4px 0 4px 20px;
    position: relative;
    transition: color var(--transition);
}

.service-card__features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 600;
}

.service-card--bti .service-card__features li::before {
    color: var(--color-secondary);
}

/* Ссылка карточки */
.service-card__link {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition), gap var(--transition);
}

.service-card:hover .service-card__link {
    gap: 10px;
}

.service-card--bti .service-card__link {
    color: var(--color-secondary);
}

/* ===== ИНФОРМАЦИОННАЯ СЕКЦИЯ ===== */
.info {
    margin-bottom: 30px;
}

.info__card {
    background: var(--color-info-bg);
    border: 1px solid var(--color-info-border);
    border-radius: var(--radius-md);
    padding: 24px 28px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    transition: all var(--transition);
}

.info__icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    color: var(--color-info-text);
    margin-top: 2px;
}

.info__title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-info-text);
    margin-bottom: 6px;
}

.info__text {
    font-size: 14px;
    color: var(--color-info-text);
    line-height: 1.6;
    opacity: 0.85;
}

/* ===== ПОДВАЛ ===== */
.footer {
    background: var(--color-footer-bg);
    border-top: 1px solid var(--color-border);
    transition: all var(--transition);
}

.footer__inner {
    padding: 24px;
    text-align: center;
}

.footer__text {
    font-size: 13px;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

/* ===== АДАПТИВНОСТЬ ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .header__inner {
        padding: 14px 16px;
    }

    .logo__text {
        font-size: 18px;
    }

    .main {
        padding: 30px 0 40px;
    }

    .hero {
        margin-bottom: 36px;
    }

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

    .service-card {
        padding: 24px 20px;
    }

    .info__card {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 400px) {
    .theme-toggle {
        width: 36px;
        height: 36px;
    }

    .theme-toggle__icon {
        width: 18px;
        height: 18px;
    }
}

/* ===== АНИМАЦИЯ ПОЯВЛЕНИЯ ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero {
    animation: fadeInUp 0.6s ease-out;
}

.service-card:nth-child(1) {
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.service-card:nth-child(2) {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.info__card {
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

/* ===== ПЕЧАТЬ ===== */
@media print {
    .header,
    .theme-toggle,
    .footer {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .service-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}