/* ============================================
   Учусь.РФ — Основные стили
   ============================================ */

/* ---------- Сброс и базовые настройки ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-secondary: #f1f5f9;
    --color-secondary-hover: #e2e8f0;
    --color-success: #16a34a;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-error-text: #dc2626;
    --color-white: #ffffff;
    --color-text-dark: #1e293b;
    --color-text-gray: #64748b;
    --color-text-light: #94a3b8;
    --color-border: #e2e8f0;
    --color-bg: #f8fafc;
    --color-bg-card: #ffffff;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 50%;

    --transition-base: all 0.25s ease;
    --max-width: 1200px;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.header__container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--color-text-dark);
    font-weight: 700;
    font-size: 1.25rem;
}

.header__logo:hover {
    text-decoration: none;
}

.header__logo-img {
    height: 36px;
    width: auto;
}

.header__nav {
    display: flex;
    gap: 0.25rem;
}

.header__nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-gray);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-base);
    font-size: 0.95rem;
}

.header__nav-link:hover,
.header__nav-link.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
    text-decoration: none;
}

.header__burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.header__burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-dark);
    border-radius: 2px;
}

/* ---------- Главный экран (Hero) ---------- */
.hero {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: var(--color-white);
    padding: 4rem 0;
}

.hero__container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 3rem;
}

.hero__content {
    flex: 1;
}

.hero__title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero__subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.hero__image {
    flex: 1;
    text-align: center;
}

.hero__image img {
    max-height: 350px;
    margin: 0 auto;
}

/* ---------- Баннеры ---------- */
.banner-secondary {
    padding: 3rem 0;
}

.banner-secondary .container {
    display: flex;
    align-items: center;
    gap: 2rem;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.banner-secondary__img {
    width: 300px;
    border-radius: var(--radius-md);
}

.banner-secondary__content h2 {
    margin-bottom: 0.5rem;
}

.banner-secondary__content p {
    color: var(--color-text-gray);
    margin-bottom: 1rem;
}

.banner-promo {
    background: var(--color-primary-light);
    padding: 3rem 0;
}

.banner-promo .container {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.banner-promo__img {
    width: 300px;
    border-radius: var(--radius-md);
}

.banner-promo__content h2 {
    margin-bottom: 1rem;
}

/* ---------- Слайдер ---------- */
.slider-section {
    padding: 3rem 0;
}

.slider-section--compact .slider {
    max-width: 600px;
    margin: 0 auto;
}

.slider {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.slider__wrapper {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.slider__slide {
    min-width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.slider__slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slider__btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    color: var(--color-white);
    border: none;
    font-size: 1.5rem;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    z-index: 10;
}

.slider__btn:hover {
    background: rgba(0, 0, 0, 0.7);
}

.slider__btn--prev {
    left: 1rem;
}

.slider__btn--next {
    right: 1rem;
}

.slider__dots {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
    z-index: 10;
}

.slider__dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition-base);
}

.slider__dot.active {
    background: var(--color-white);
    width: 24px;
    border-radius: 5px;
}

/* ---------- Секция курсов ---------- */
.courses-overview {
    padding: 3rem 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--color-text-dark);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.course-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    text-align: center;
}

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

.course-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.course-card h3 {
    padding: 1rem 1rem 0.25rem;
    font-size: 1.1rem;
}

.course-card p {
    padding: 0 1rem 1.5rem;
    color: var(--color-text-gray);
    font-size: 0.9rem;
}

/* ---------- Галерея ---------- */
.gallery-section {
    padding: 3rem 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.gallery-grid img {
    border-radius: var(--radius-md);
    aspect-ratio: 4 / 3;
    object-fit: cover;
    transition: var(--transition-base);
}

.gallery-grid img:hover {
    transform: scale(1.03);
}

/* ---------- Кнопки ---------- */
.btn {
    display: inline-block;
    padding: 0.65rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-family: inherit;
    text-decoration: none;
    outline: none;
}

.btn:hover {
    text-decoration: none;
}

.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-text-dark);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-hover);
}

.btn-lg {
    padding: 0.85rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

/* ---------- Формы ---------- */
.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.7rem 0.85rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-base);
    background: var(--color-white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group.has-error input,
.form-group.has-error select {
    border-color: var(--color-error);
}

.form-error {
    display: block;
    color: var(--color-error-text);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

/* ---------- Страницы авторизации ---------- */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 2rem;
}

.auth-container {
    width: 100%;
    max-width: 450px;
}

.auth-card {
    background: var(--color-white);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.auth-logo {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.auth-logo img {
    height: 50px;
}

.auth-card h1 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.auth-link {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--color-text-gray);
    font-size: 0.95rem;
}

/* ---------- Алерты ---------- */
.alert {
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* ---------- Таблицы ---------- */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table th,
.table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
}

.table th {
    background: var(--color-bg);
    font-weight: 600;
    color: var(--color-text-gray);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tr:hover td {
    background: #f8fafc;
}

/* ---------- Статусы ---------- */
.status-badge {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.status-badge--новая {
    background: #dbeafe;
    color: #1e40af;
}

.status-badge--идет-обучение {
    background: #fef3c7;
    color: #92400e;
}

.status-badge--обучение-завершено {
    background: #dcfce7;
    color: #166534;
}

.text-success {
    color: var(--color-success);
    font-weight: 600;
}

/* ---------- Модальное окно ---------- */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal__content {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    position: relative;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal__close {
    position: absolute;
    top: 0.75rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-light);
}

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

/* ---------- Уведомление (тост) ---------- */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--color-text-dark);
    color: var(--color-white);
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    opacity: 0;
    transform: translateY(1rem);
    transition: var(--transition-base);
    z-index: 2000;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background: var(--color-success);
}

.toast.error {
    background: var(--color-error);
}

/* ---------- Фильтры ---------- */
.filters {
    background: var(--color-white);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.filters__form {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

.filters__form select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

/* ---------- Пагинация ---------- */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.pagination__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    color: var(--color-text-dark);
    font-size: 0.9rem;
    text-decoration: none;
    transition: var(--transition-base);
}

.pagination__link:hover,
.pagination__link--active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
    text-decoration: none;
}

/* ---------- Профиль ---------- */
.profile-page {
    padding: 3rem 0;
}

.profile-welcome {
    color: var(--color-text-gray);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.empty-message {
    text-align: center;
    color: var(--color-text-gray);
    padding: 2rem;
}

.reviews-list {
    display: grid;
    gap: 1rem;
}

.review-card {
    background: var(--color-white);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.review-card h4 {
    margin-bottom: 0.5rem;
}

.review-card p {
    color: var(--color-text-gray);
    font-size: 0.95rem;
}

.review-date {
    font-size: 0.8rem;
    color: var(--color-text-light);
}

/* ---------- Футер ---------- */
.footer {
    background: var(--color-text-dark);
    color: var(--color-text-light);
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
    font-size: 0.9rem;
}

/* ---------- Адаптивность ---------- */
@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero__container {
        flex-direction: column;
        text-align: center;
    }

    .hero__title {
        font-size: 1.8rem;
    }

    .banner-secondary .container,
    .banner-promo .container {
        flex-direction: column;
        text-align: center;
    }

    .banner-secondary__img,
    .banner-promo__img {
        width: 100%;
        max-width: 300px;
    }

    .header__nav {
        display: none;
    }

    .header__burger {
        display: flex;
    }

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

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

    .filters__form {
        flex-direction: column;
    }

    .slider {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }

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

    .auth-card {
        padding: 1.5rem;
    }

    .container {
        padding: 0 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }
}