:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #7c3aed;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1e293b;
    --gray: #64748b;
    --light: #f8fafc;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 16px;
}

@media (min-width: 768px) {
    .container { padding: 0 24px; }
}

/* ===== HEADER ===== */
.header {
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    gap: 12px;
    flex-wrap: wrap;
}

@media (min-width: 768px) {
    .header-inner { padding: 16px 0; }
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

@media (min-width: 768px) {
    .logo { font-size: 24px; gap: 10px; }
}

.logo i { font-size: 24px; background: none; -webkit-background-clip: unset; color: var(--primary); }
.badge { font-size: 8px; background: var(--primary); color: white; padding: 2px 6px; border-radius: 20px; font-weight: 500; }
@media (min-width: 768px) { .badge { font-size: 10px; padding: 2px 8px; } }

/* Навигация */
.nav {
    display: none;
    width: 100%;
    flex-direction: column;
    background: white;
    padding: 16px;
    border-radius: var(--radius-sm);
    margin-top: 10px;
    gap: 8px;
}

.nav.show { display: flex; }

@media (min-width: 768px) {
    .nav {
        display: flex;
        width: auto;
        flex-direction: row;
        background: none;
        padding: 0;
        margin: 0;
        gap: 4px;
    }
}

.nav-link {
    padding: 8px 12px;
    color: var(--gray);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
    font-weight: 500;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

@media (min-width: 768px) {
    .nav-link { padding: 8px 16px; font-size: 15px; }
}

.nav-link i { font-size: 14px; }
.nav-link:hover { background: var(--light); color: var(--primary); }
.nav-link.active { background: var(--primary); color: white; }

.mobile-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray);
}

@media (min-width: 768px) { .mobile-toggle { display: none; } }

.btn-login, .btn-logout {
    padding: 6px 14px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s;
}

@media (min-width: 768px) {
    .btn-login, .btn-logout { padding: 8px 20px; }
}

.btn-login { background: var(--primary); color: white; }
.btn-login:hover { background: var(--primary-dark); }
.btn-logout { background: var(--gray); color: white; }

/* ===== ОСНОВНОЙ КОНТЕНТ ===== */
main { min-height: calc(100vh - 180px); padding: 20px 0; }
@media (min-width: 768px) { main { padding: 40px 0; } }

/* Герой */
.hero {
    text-align: center;
    padding: 40px 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius);
    margin-bottom: 24px;
    color: white;
}

@media (min-width: 768px) {
    .hero { padding: 60px 20px; margin-bottom: 40px; }
}

.hero h1 { font-size: 32px; margin-bottom: 12px; }
@media (min-width: 768px) { .hero h1 { font-size: 48px; margin-bottom: 20px; } }
.hero p { font-size: 16px; opacity: 0.95; max-width: 600px; margin: 0 auto; }
@media (min-width: 768px) { .hero p { font-size: 20px; } }

/* Статистика */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 32px;
}

@media (min-width: 640px) { .stats-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; } }
@media (min-width: 768px) { .stats-grid { gap: 24px; margin-bottom: 48px; } }

.stat-card {
    background: white;
    padding: 16px 12px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
}

@media (min-width: 768px) { .stat-card { padding: 24px; } }

.stat-card i { font-size: 28px; color: var(--primary); margin-bottom: 8px; }
@media (min-width: 768px) { .stat-card i { font-size: 40px; margin-bottom: 12px; } }
.stat-card h3 { font-size: 22px; font-weight: 700; }
@media (min-width: 768px) { .stat-card h3 { font-size: 32px; } }
.stat-card p { font-size: 12px; color: var(--gray); }
@media (min-width: 768px) { .stat-card p { font-size: 14px; } }

/* Карточки возможностей */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 32px;
}

@media (min-width: 640px) { .features-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; } }
@media (min-width: 1024px) { .features-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 48px; } }

.feature-card {
    background: white;
    padding: 20px 16px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

@media (min-width: 768px) { .feature-card { padding: 28px; } }

.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-card i { font-size: 28px; color: var(--primary); margin-bottom: 12px; }
@media (min-width: 768px) { .feature-card i { font-size: 36px; margin-bottom: 16px; } }
.feature-card h3 { font-size: 16px; margin-bottom: 8px; }
@media (min-width: 768px) { .feature-card h3 { font-size: 20px; margin-bottom: 12px; } }
.feature-card p { font-size: 13px; color: var(--gray); line-height: 1.4; }
@media (min-width: 768px) { .feature-card p { font-size: 14px; line-height: 1.5; } }

/* Таблицы */
.page-card {
    background: white;
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

@media (min-width: 768px) { .page-card { padding: 24px; } }

.page-title {
    font-size: 18px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

@media (min-width: 640px) {
    .page-title {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}
@media (min-width: 768px) { .page-title { font-size: 24px; margin-bottom: 24px; } }

.data-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 500px;
}

.data-table th, .data-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid #e2e8f0; font-size: 13px; }
@media (min-width: 768px) { .data-table th, .data-table td { padding: 12px 16px; font-size: 14px; } }
.data-table th { background: var(--light); font-weight: 600; color: var(--dark); }
.data-table tr:hover { background: var(--light); }

/* Кнопки */
.btn-primary, .btn-add, .btn-login, .btn-logout {
    padding: 8px 16px;
    font-size: 13px;
}
@media (min-width: 768px) {
    .btn-primary, .btn-add, .btn-login, .btn-logout { padding: 10px 20px; font-size: 14px; }
}

.search-bar {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

@media (min-width: 480px) { .search-bar { flex-direction: row; } }

.search-bar input { flex: 1; padding: 10px 12px; border: 1px solid #e2e8f0; border-radius: var(--radius-sm); font-size: 14px; }

/* Модальное окно */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.login-modal { padding: 20px; }
@media (min-width: 768px) { .login-modal { padding: 32px; } }

.close { position: absolute; right: 16px; top: 12px; font-size: 24px; cursor: pointer; color: var(--gray); }
@media (min-width: 768px) { .close { right: 20px; top: 16px; } }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 14px; }
.form-group input { width: 100%; padding: 10px 12px; border: 1px solid #e2e8f0; border-radius: var(--radius-sm); font-size: 14px; }

.form-actions { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; }

/* Подвал */
.footer {
    background: var(--dark);
    color: white;
    padding: 16px 0;
    margin-top: 30px;
}

@media (min-width: 768px) { .footer { padding: 24px 0; margin-top: 40px; } }

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

@media (min-width: 640px) {
    .footer-inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-copyright { font-size: 12px; opacity: 0.8; }
@media (min-width: 768px) { .footer-copyright { font-size: 14px; } }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.footer-links a { color: #94a3b8; text-decoration: none; font-size: 12px; transition: color 0.2s; }
@media (min-width: 768px) { .footer-links a { font-size: 14px; } }
.footer-links a:hover { color: white; }
.footer-links i { margin-right: 4px; }

/* Лоадер */
.loading-spinner {
    text-align: center;
    padding: 40px;
    font-size: 20px;
    color: var(--gray);
}
@media (min-width: 768px) { .loading-spinner { padding: 60px; font-size: 24px; } }