:root {
    --primary-color: #dc3545;
    --primary-hover: #c82333;
    --secondary-color: #6c757d;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #343a40;
    --white: #ffffff;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
}

* {
    box-sizing: border-box;
    transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    color: var(--dark-gray);
    margin: 0;
    padding: 0;
}

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

.navbar {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-gray);
    padding: 8px 16px;
    border-radius: 4px;
}

.nav-links a:hover {
    background-color: var(--medium-gray);
    color: var(--primary-color);
}

.slider-container {
    max-width: 1000px;
    margin: 30px auto;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.slider {
    position: relative;
    height: 400px;
}

.slides {
    display: flex;
    width: 400%;
    height: 100%;
}

.slide {
    width: 25%;
    height: 100%;
    opacity: 0;
    position: absolute;
    transition: opacity 0.5s ease;
}

.slide.active {
    opacity: 1;
    position: relative;
}

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

.slide-text {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 20px;
    font-size: 1.2em;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.8);
    border: none;
    padding: 15px;
    cursor: pointer;
    font-size: 24px;
    z-index: 10;
}

.slider-btn:hover {
    background: white;
}

.prev {
    left: 10px;
}

.next {
    right: 10px;
}

.features, .info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.feature-card, .info-card {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.feature-card:hover, .info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.login-container, .register-container, .profile-container,
.submit-reading-container, .admin-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 40px;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.login-form, .register-form, .profile-form, .submit-reading-form {
    max-width: 500px;
    margin: 0 auto;
}

.table {
    width: 100%;
    background: var(--white);
    border-collapse: collapse;
    margin: 20px 0;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.table th {
    background-color: var(--medium-gray);
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.table td {
    padding: 15px;
    border-bottom: 1px solid var(--medium-gray);
}

.table tr:hover {
    background-color: var(--light-gray);
}

.status-badge {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 500;
}

.status-new {
    background-color: #ffecb3;
    color: #ff9800;
}

.status-accepted {
    background-color: #c8e6c9;
    color: #388e3c;
}

.status-error {
    background-color: #ffcdd2;
    color: #d32f2f;
}

.btn {
    display: inline-block;
    padding: 10px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    text-decoration: none;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

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

.btn-success:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 15px;
    margin: 20px 0;
    border-radius: 5px;
    border: 1px solid transparent;
}

.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

.info-card.urgent {
    border-left: 5px solid var(--danger);
}

.info-card.deadline {
    border-left: 5px solid var(--warning);
}

.info-card.contact {
    border-left: 5px solid var(--success);
}


/* Базовые стили для форм */
.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    color: #495057;
    background-color: #fff;
    border-color: #dc3545;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, 
                border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.btn-primary {
    color: #fff;
    background-color: #dc3545;
    border-color: #dc3545;
}

.btn-primary:hover {
    color: #fff;
    background-color: #c82333;
    border-color: #bd2130;
}

.btn-secondary {
    color: #fff;
    background-color: #6c757d;
    border-color: #6c757d;
}

.btn-secondary:hover {
    color: #fff;
    background-color: #5a6268;
    border-color: #545b62;
}

.btn-success {
    color: #fff;
    background-color: #28a745;
    border-color: #28a745;
}

.btn-success:hover {
    color: #fff;
    background-color: #218838;
    border-color: #1e7e34;
}

.navbar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
}

.navbar-dark {
    background-color: #343a40;
}

.navbar-brand {
    display: inline-block;
    padding-top: 0.3125rem;
    padding-bottom: 0.3125rem;
    margin-right: 1rem;
    font-size: 1.25rem;
    line-height: inherit;
    white-space: nowrap;
    color: #fff;
    text-decoration: none;
}

.table {
    width: 100%;
    margin-bottom: 1rem;
    color: #212529;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    vertical-align: top;
    border-top: 1px solid #dee2e6;
}

.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid #dee2e6;
}

.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0,0,0,.125);
    border-radius: 0.25rem;
}

.card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-header {
    padding: 0.75rem 1.25rem;
    margin-bottom: 0;
    background-color: rgba(0,0,0,.03);
    border-bottom: 1px solid rgba(0,0,0,.125);
}

.mt-4 { margin-top: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.mb-5 { margin-bottom: 3rem !important; }
.py-3 { padding-top: 1rem !important; padding-bottom: 1rem !important; }
.bg-light { background-color: #f8f9fa !important; }
.text-center { text-align: center !important; }

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 10px;
    }
    
    .features, .info-cards {
        grid-template-columns: 1fr;
    }
    
    .slider {
        height: 300px;
    }
    
    .login-container, .register-container {
        padding: 20px;
        margin: 20px auto;
    }
    
    .table {
        display: block;
        overflow-x: auto;
    }
}