/* ===== CSS ПЕРЕМЕННЫЕ ===== */
:root {
    /* Цветовая схема (светлая) */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-nav: #ffffff;
    --bg-footer: #1e293b;

    --text: #1e293b;
    --text-light: #64748b;
    --text-on-primary: #ffffff;

    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --radius: 0.75rem;
    --radius-sm: 0.5rem;
    --radius-lg: 1rem;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Mono', 'Segoe UI Mono', 'Roboto Mono', monospace;

    /* Размеры */
    --header-height: 4rem;
    --container-padding: 1rem;
    --touch-min: 44px;
}

/* Тёмная тема */
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #3b82f6;
        --primary-dark: #2563eb;
        --secondary: #94a3b8;
        --success: #10b981;
        --warning: #f59e0b;
        --danger: #ef4444;
        --info: #60a5fa;

        --bg: #0f172a;
        --bg-card: #1e293b;
        --bg-nav: #1e293b;
        --bg-footer: #0f172a;

        --text: #f1f5f9;
        --text-light: #94a3b8;
        --text-on-primary: #ffffff;

        --border: #334155;
        --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    }
}

/* ===== БАЗОВЫЕ СТИЛИ ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ===== ТИПОГРАФИЯ ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-light); }

/* ===== НАВБАР ===== */
.navbar {
    background-color: var(--bg-nav);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text);
}

.logo .material-icons {
    font-size: 2rem;
    color: var(--primary);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    min-height: var(--touch-min);
    min-width: var(--touch-min);
    border-radius: var(--radius-sm);
}

.menu-toggle:hover {
    background-color: var(--border);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text);
    font-weight: 500;
    min-height: var(--touch-min);
}

.nav-link:hover {
    background-color: var(--border);
    color: var(--primary);
}

.logout-btn {
    background-color: var(--danger);
    color: white;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

.logout-btn:hover {
    background-color: #dc2626;
}

/* ===== ОСНОВНОЙ КОНТЕНТ ===== */
main {
    flex: 1;
    padding: 2rem 0;
}

.page-title {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.page-subtitle {
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* ===== КАРТОЧКИ ===== */
.dashboard-card,
.session-card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 1rem;
    background-color: rgba(0, 0, 0, 0.02);
}

.card-header-warning {
    background-color: rgba(245, 158, 11, 0.1);
    border-left: 4px solid var(--warning);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ===== СЕТКИ ===== */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.session-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.info-grid,
.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

/* ===== КНОПКИ ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    min-height: var(--touch-min);
    text-align: center;
    line-height: 1;
}

.btn-block {
    width: 100%;
}

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

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

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background-color: var(--primary);
    color: var(--text-on-primary);
}

.btn-warning {
    background-color: var(--warning);
    color: #000;
}

.btn-warning:hover {
    background-color: #d97706;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    min-height: var(--touch-min);
    min-width: var(--touch-min);
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

/* ===== ФОРМЫ ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text);
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--bg-card);
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
    min-height: var(--touch-min);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
}

/* ===== TOAST ===== */
.toast {
    position: fixed;
    top: 1rem;
    right: 1rem;
    max-width: 400px;
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    transform: translateY(-1rem);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.toast-success {
    border-left: 4px solid var(--success);
    background-color: rgba(16, 185, 129, 0.1);
}

.toast-error {
    border-left: 4px solid var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
}

/* ===== СПИННЕР ===== */
.spinner {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator {
    display: inline-block;
}

.htmx-request.htmx-indicator {
    display: inline-block;
}

/* ===== АВТОРИЗАЦИЯ ===== */
.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--header-height) - 6rem);
}

.auth-card {
    width: 100%;
    max-width: 450px;
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.auth-header {
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.auth-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.auth-form {
    padding: 2rem;
}

.form-actions {
    margin-top: 2rem;
}

.auth-footer {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-light);
    font-size: 0.875rem;
}

/* ===== СЕССИЯ ===== */
.session-header {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.session-header-active {
    border-left: 6px solid var(--primary);
}

.session-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    margin-top: 1rem;
}

.status-active {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.status-ended {
    background-color: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.status-paid {
    background-color: rgba(59, 130, 246, 0.2);
    color: var(--info);
}

.timer-display {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-align: center;
    color: var(--primary);
    margin: 1rem 0;
}

.cost-display {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cost-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.cost-amount {
    font-size: 1.5rem;
    color: var(--warning);
}

.progress-bar {
    height: 0.75rem;
    background-color: var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background-color: var(--warning);
    border-radius: var(--radius-sm);
    transition: width 0.3s;
}

/* ===== СПИСКИ ===== */
.list {
    list-style: none;
}

.list-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.list-item:last-child {
    border-bottom: none;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.badge-secondary {
    background-color: rgba(100, 116, 139, 0.2);
    color: var(--secondary);
}

/* ===== МОДАЛЬНОЕ ОКНО ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 1rem;
}

.modal {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--bg-footer);
    color: var(--text-light);
    padding: 2rem 0;
    margin-top: auto;
}

.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-light);
    margin: 0 0.5rem;
}

.footer-links a:hover {
    color: var(--primary);
}

/* ===== АДАПТИВНОСТЬ ===== */
@media (max-width: 768px) {
    html { font-size: 14px; }
    .container { padding: 0 1rem; }
    .menu-toggle { display: block; }
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--bg-nav);
        flex-direction: column;
        padding: 1rem;
        border-top: 1px solid var(--border);
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
    }
    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .dashboard-grid,
    .session-grid {
        grid-template-columns: 1fr;
    }
    .timer-display {
        font-size: 2.5rem;
    }
    .btn-lg {
        padding: 0.875rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .card-header,
    .card-body,
    .card-footer {
        padding: 1rem;
    }
    .auth-card {
        border-radius: var(--radius);
    }
    .auth-header,
    .auth-form {
        padding: 1.5rem;
    }
}