@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@400;600;800&display=swap');

/* Глобальный сброс и шрифты */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Заголовки */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.25;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

/* Контейнеры */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-4);
    width: 100%;
}

.content-width {
    max-width: 1100px;
    margin: 0 auto;
}

.form-container {
    max-width: 480px;
    margin: var(--space-12) auto;
    background: var(--color-surface);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

/* Сетка и разметка */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.grid {
    display: grid;
    gap: var(--space-6);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}

/* Кнопки */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    padding: 0 var(--space-6);
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    text-decoration: none;
    gap: var(--space-2);
}

.btn-primary {
    background-color: var(--color-primary-600);
    color: #ffffff;
}
.btn-primary:hover {
    background-color: var(--color-primary-700);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--color-surface);
    border-color: var(--color-border);
    color: var(--color-text-soft);
}
.btn-secondary:hover {
    background-color: var(--color-surface-soft);
    border-color: var(--color-border-strong);
}

.btn-student {
    background-color: var(--color-secondary-600);
    color: #ffffff;
    font-family: 'Outfit', sans-serif;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 6px rgba(124, 58, 237, 0.1);
}
.btn-student:hover {
    background-color: var(--color-secondary-500);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3);
}

.btn-danger {
    background-color: var(--color-danger-500);
    color: #ffffff;
}
.btn-danger:hover {
    background-color: var(--color-danger-500);
    opacity: 0.9;
}

/* Формы */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-soft);
    margin-bottom: var(--space-2);
}

.form-control {
    width: 100%;
    height: 44px;
    padding: 0 var(--space-4);
    font-size: var(--text-base);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: all 0.15s ease-in-out;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Карточки */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease-in-out;
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

/* Student-specific Cards */
.card-student {
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    box-shadow: 0 8px 0 var(--color-border);
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.card-student:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 0 var(--color-border-strong);
    border-color: var(--color-border-strong);
}

/* Бейджи */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-pill);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-info { background-color: #e0f2fe; color: #0369a1; }
.badge-success { background-color: #dcfce7; color: #15803d; }
.badge-warning { background-color: #fef3c7; color: #b45309; }
.badge-danger { background-color: #fee2e2; color: #b91c1c; }

/* Навигационные панели */
.navbar {
    height: 72px;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
}

.brand {
    font-family: 'Outfit', sans-serif;
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--color-primary-600);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.brand-student {
    color: var(--color-secondary-600);
}

/* Дашборд преподавателя */
.app-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr;
    }
}

.sidebar {
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.sidebar-nav {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    color: var(--color-text-soft);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all 0.15s ease;
    gap: var(--space-3);
}

.sidebar-link:hover, .sidebar-link.active {
    background-color: var(--color-primary-50);
    color: var(--color-primary-700);
}

.main-content {
    padding: var(--space-8);
    background-color: var(--color-bg);
}

/* Лендинг */
.hero {
    padding: var(--space-16) 0;
    text-align: center;
    background: radial-gradient(circle at 50% 50%, var(--color-primary-50) 0%, transparent 60%);
}

.hero-title {
    font-family: 'Outfit', sans-serif;
    font-size: 54px;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, var(--color-primary-700) 0%, var(--color-secondary-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-soft);
    max-width: 600px;
    margin: 0 auto var(--space-8) auto;
}

/* Мобильная адаптация */
.mobile-navbar {
    display: none;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-close-btn {
    display: none;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
    gap: var(--space-4);
}

@media (max-width: 1024px) {
    .mobile-navbar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 64px;
        padding: 0 var(--space-6);
        background-color: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        position: sticky;
        top: 0;
        z-index: 99;
    }

    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        background: none;
        border: none;
        cursor: pointer;
        color: var(--color-text);
        border-radius: var(--radius-md);
        transition: background-color 0.2s;
    }

    .mobile-menu-toggle:hover {
        background-color: var(--color-surface-soft);
    }

    .mobile-menu-toggle i {
        width: 24px;
        height: 24px;
    }

    .sidebar-close-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: none;
        border: none;
        cursor: pointer;
        color: var(--color-text-soft);
        border-radius: var(--radius-md);
        transition: background-color 0.2s;
    }

    .sidebar-close-btn:hover {
        background-color: var(--color-surface-soft);
    }

    .sidebar-close-btn i {
        width: 20px;
        height: 20px;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        z-index: 1000;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.sidebar-open {
        transform: translateX(0);
    }

    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(15, 23, 42, 0.4);
        backdrop-filter: blur(2px);
        z-index: 999;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: var(--space-4);
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-4);
    }

    .page-header > div:last-child {
        width: 100%;
        display: flex;
        flex-direction: column;
        gap: var(--space-2);
    }

    .page-header .btn {
        width: 100%;
    }
}