:root {
    /* Material Design 3 цветовая схема */
    --md-primary: #4487FF;
    --md-primary-container: #d8e6ff;
    --md-on-primary: #ffffff;
    --md-on-primary-container: #001c38;
    
    --md-secondary: #6c757d;
    --md-secondary-container: #d3e5f5;
    --md-on-secondary: #ffffff;
    --md-on-secondary-container: #0c1d29;
    
    --md-tertiary: #198754;
    --md-tertiary-container: #d1e7dd;
    --md-on-tertiary: #ffffff;
    --md-on-tertiary-container: #0a3622;
    
    --md-error: #dc3545;
    --md-error-container: #ffdad6;
    --md-on-error: #ffffff;
    --md-on-error-container: #410002;
    
    --md-background: #f8f9fa;
    --md-on-background: #212529;
    --md-surface: #ffffff;
    --md-on-surface: #212529;
    
    --md-surface-variant: #dfe2eb;
    --md-on-surface-variant: #43474e;
    
    --md-outline: #6c757d;
    --md-outline-variant: #c3c7cf;
    
    --md-inverse-surface: #2f3033;
    --md-inverse-on-surface: #f1f0f4;
    
    /* Тени */
    --md-elevation-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --md-elevation-2: 0 3px 6px rgba(0,0,0,0.15), 0 2px 4px rgba(0,0,0,0.12);
    --md-elevation-3: 0 10px 20px rgba(0,0,0,0.15), 0 3px 6px rgba(0,0,0,0.10);
    
    /* Скругления */
    --md-shape-small: 4px;
    --md-shape-medium: 8px;
    --md-shape-large: 16px;
    --md-shape-extra-large: 28px;
    
    /* Анимации */
    --md-transition-standard: 0.3s cubic-bezier(0.2, 0, 0, 1);
    --md-transition-emphasized: 0.5s cubic-bezier(0.2, 0, 0, 1);
    
    /* Базовые размеры */
    --base-font-size: 14px;
    --container-max-width: 1280px;
}

/* Базовые стили */
* {
    box-sizing: border-box;
}

html {
    font-size: var(--base-font-size);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--md-background);
    color: var(--md-on-background);
    line-height: 1.6;
    font-size: 1rem;
}

/* Контейнер с максимальной шириной */
.container,
.container-fluid {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding-left: 15px;
    padding-right: 15px;
}

@media (min-width: 576px) {
    .container,
    .container-fluid {
        padding-left: 20px;
        padding-right: 20px;
    }
}

@media (min-width: 768px) {
    .container,
    .container-fluid {
        padding-left: 30px;
        padding-right: 30px;
    }
}

@media (min-width: 1200px) {
    .container,
    .container-fluid {
        padding-left: 40px;
        padding-right: 40px;
    }
}

/* Типографика */
h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    font-weight: 500;
    line-height: 1.2;
    color: var(--md-on-surface);
}

h1 {
    font-size: 2.25rem;
    font-weight: 400;
    margin: 0 0 1rem;
    letter-spacing: -0.022em;
}

h2 {
    font-size: 1.75rem;
    font-weight: 400;
    margin: 0 0 0.875rem;
    letter-spacing: -0.018em;
}

h3 {
    font-size: 1.5rem;
    font-weight: 400;
    margin: 0 0 0.75rem;
    letter-spacing: -0.015em;
}

h4 {
    font-size: 1.25rem;
    font-weight: 500;
    margin: 0 0 0.625rem;
    letter-spacing: -0.012em;
}

h5 {
    font-size: 1.125rem;
    font-weight: 500;
    margin: 0 0 0.5rem;
    letter-spacing: -0.009em;
}

h6 {
    font-size: 1rem;
    font-weight: 500;
    margin: 0 0 0.5rem;
    letter-spacing: -0.006em;
}

p {
    margin: 0 0 1rem;
}

/* Анимации */
.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

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

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Кнопки */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.5rem;
    border-radius: var(--md-shape-small);
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.0892857143em;
    transition: var(--md-transition-standard);
    cursor: pointer;
    border: none;
    outline: none;
    position: relative;
    overflow: hidden;
    min-height: 40px;
}

.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: transparent;
    transition: var(--md-transition-standard);
    pointer-events: none;
}

.btn:hover::after {
    background-color: rgba(0, 0, 0, 0.08);
}

.btn:active::after {
    background-color: rgba(0, 0, 0, 0.12);
}

.btn:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover:before {
    left: 100%;
}

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

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

.btn-tertiary {
    background-color: var(--md-tertiary);
    color: var(--md-on-tertiary);
}

.btn-outlined {
    background-color: transparent;
    color: var(--md-primary);
    border: 1px solid var(--md-outline);
}

.btn-text {
    background-color: transparent;
    color: var(--md-primary);
    padding: 0.625rem 1rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
}

/* Карточки */
.card {
    background-color: var(--md-surface);
    border-radius: var(--md-shape-medium);
    box-shadow: var(--md-elevation-1);
    transition: var(--md-transition-standard);
    overflow: hidden;
    border: none;
}

.card:hover {
    box-shadow: var(--md-elevation-2);
    transform: translateY(-2px);
}

.card-header {
    padding: 1rem 1.5rem;
    background-color: var(--md-surface);
    border-bottom: 1px solid var(--md-outline-variant);
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background-color: var(--md-surface);
    border-top: 1px solid var(--md-outline-variant);
}

/* Формы */
.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--md-on-surface);
    background-color: var(--md-surface);
    background-clip: padding-box;
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-small);
    transition: var(--md-transition-standard);
}

.form-control:focus {
    color: var(--md-on-surface);
    background-color: var(--md-surface);
    border-color: var(--md-primary);
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--md-on-surface-variant);
    font-size: 0.875rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-select {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--md-on-surface);
    background-color: var(--md-surface);
    background-clip: padding-box;
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-small);
    transition: var(--md-transition-standard);
}

.form-select:focus {
    border-color: var(--md-primary);
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

/* Таблицы */
.table {
    width: 100%;
    margin-bottom: 1rem;
    color: var(--md-on-surface);
    vertical-align: top;
    border-color: var(--md-outline-variant);
    background: var(--md-surface);
    border-radius: var(--md-shape-medium);
    overflow: hidden;
    box-shadow: var(--md-elevation-1);
}

.table thead th {
    border-bottom: 2px solid var(--md-outline-variant);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.table tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.04);
}

/* Утилиты */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

.text-primary { color: var(--md-primary); }
.text-secondary { color: var(--md-secondary); }
.text-tertiary { color: var(--md-tertiary); }
.text-error { color: var(--md-error); }
.text-white { color: #ffffff; }

.bg-primary { background-color: var(--md-primary); }
.bg-primary-container { background-color: var(--md-primary-container); }
.bg-secondary { background-color: var(--md-secondary); }
.bg-secondary-container { background-color: var(--md-secondary-container); }
.bg-tertiary { background-color: var(--md-tertiary); }
.bg-tertiary-container { background-color: var(--md-tertiary-container); }
.bg-error { background-color: var(--md-error); }
.bg-error-container { background-color: var(--md-error-container); }
.bg-surface { background-color: var(--md-surface); }
.bg-surface-variant { background-color: var(--md-surface-variant); }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.ms-1 { margin-left: 0.25rem; }
.ms-2 { margin-left: 0.5rem; }
.ms-3 { margin-left: 1rem; }
.ms-4 { margin-left: 1.5rem; }
.ms-5 { margin-left: 3rem; }

.me-1 { margin-right: 0.25rem; }
.me-2 { margin-right: 0.5rem; }
.me-3 { margin-right: 1rem; }
.me-4 { margin-right: 1.5rem; }
.me-5 { margin-right: 3rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

.pt-1 { padding-top: 0.25rem; }
.pt-2 { padding-top: 0.5rem; }
.pt-3 { padding-top: 1rem; }
.pt-4 { padding-top: 1.5rem; }
.pt-5 { padding-top: 3rem; }

.pb-1 { padding-bottom: 0.25rem; }
.pb-2 { padding-bottom: 0.5rem; }
.pb-3 { padding-bottom: 1rem; }
.pb-4 { padding-bottom: 1.5rem; }
.pb-5 { padding-bottom: 3rem; }

.ps-1 { padding-left: 0.25rem; }
.ps-2 { padding-left: 0.5rem; }
.ps-3 { padding-left: 1rem; }
.ps-4 { padding-left: 1.5rem; }
.ps-5 { padding-left: 3rem; }

.pe-1 { padding-right: 0.25rem; }
.pe-2 { padding-right: 0.5rem; }
.pe-3 { padding-right: 1rem; }
.pe-4 { padding-right: 1.5rem; }
.pe-5 { padding-right: 3rem; }

.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }
.justify-content-start { justify-content: flex-start; }
.justify-content-end { justify-content: flex-end; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-around { justify-content: space-around; }
.align-items-start { align-items: flex-start; }
.align-items-end { align-items: flex-end; }
.align-items-center { align-items: center; }
.align-items-stretch { align-items: stretch; }
.flex-grow-1 { flex-grow: 1; }
.flex-shrink-0 { flex-shrink: 0; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }
.gap-5 { gap: 3rem; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

/* Адаптивность */
@media (max-width: 1024px) and (min-width: 769px) {
    html {
        font-size: 13px;
    }
    
    .container,
    .container-fluid {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .card-body {
        padding: 1.25rem;
    }
}

@media (max-width: 768px) {
    .desktop-only { display: none !important; }
    html { font-size: 13px; }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.25rem; }
    h5 { font-size: 1.1rem; }
    h6 { font-size: 1rem; }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1.25rem;
    }
}

@media (min-width: 769px) {
    .mobile-only { display: none !important; }
}

@media (max-width: 576px) {
    html { font-size: 12px; }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.1rem; }
    h5 { font-size: 1rem; }
    h6 { font-size: 0.9rem; }
    
    .container,
    .container-fluid {
        padding-left: 10px;
        padding-right: 10px;
    }
    
    .card {
        border-radius: var(--md-shape-small);
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
    }
    
    .mobile-full-width {
        width: 100% !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
    }
}

/* Темная тема */
@media (prefers-color-scheme: dark) {
    :root {
        --md-background: #121212;
        --md-on-background: #e0e0e0;
        --md-surface: #1e1e1e;
        --md-on-surface: #e0e0e0;
        --md-surface-variant: #2d2d2d;
        --md-on-surface-variant: #c4c4c4;
        --md-outline: #757575;
        --md-outline-variant: #5e5e5e;
    }
    
    .card {
        background-color: var(--md-surface);
        border-color: var(--md-outline-variant);
    }
    
    .table {
        color: var(--md-on-surface);
        border-color: var(--md-outline-variant);
    }
    
    .form-control, .form-select {
        background-color: var(--md-surface);
        color: var(--md-on-surface);
        border-color: var(--md-outline-variant);
    }
}

/* Дополнительные стили для админ-панели */
.auth-card {
    position: relative;
    max-width: 500px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--md-surface);
    border-radius: var(--md-shape-medium);
    box-shadow: var(--md-elevation-1);
}

.auth-title {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    font-weight: 400;
    color: var(--md-on-surface);
}

.auth-subtitle {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--md-on-surface-variant);
}

.auth-header {
    background-color: var(--md-primary);
    color: var(--md-on-primary);
    padding: 1.25rem;
    border-radius: var(--md-shape-medium) var(--md-shape-medium) 0 0;
    text-align: center;
    margin: -2rem -2rem 1.5rem -2rem;
}

.auth-header h4 {
    margin: 0;
    font-weight: 500;
    color: #ffffff !important;
}

.auth-icon {
    font-size: 3rem;
    color: var(--md-primary);
    margin-bottom: 1rem;
}

.error-message {
    color: var(--md-error);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.success-message {
    color: var(--md-tertiary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.hidden {
    display: none !important;
}