/* ===== Design Tokens ===== */
:root {
    /* Colors */
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-success: #22c55e;
    --color-success-bg: #dcfce7;
    --color-success-text: #166534;
    --color-danger-bg: #fee2e2;
    --color-danger-text: #991b1b;
    --color-info-bg: #dbeafe;
    --color-info-text: #2563eb;

    /* Neutrals */
    --color-bg: #f5f7fa;
    --color-surface: #ffffff;
    --color-surface-alt: #f8fafc;
    --color-text: #1a1a2e;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-text-dark: #334155;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-toggle-off: #cbd5e1;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 20px;
    --space-2xl: 24px;
    --space-3xl: 32px;
    --space-4xl: 40px;
    --space-5xl: 60px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --text-xs: 11px;
    --text-sm: 12px;
    --text-md: 14px;
    --text-lg: 16px;
    --text-xl: 18px;
    --text-2xl: 20px;
    --text-3xl: 24px;
    --text-4xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s;
    --transition-normal: 0.2s;
}

/* ===== Dark Theme ===== */
:root[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-surface-alt: #273549;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-text-dark: #cbd5e1;
    --color-border: #334155;
    --color-border-light: #1e293b;
    --color-toggle-off: #475569;
    --color-success-bg: #14532d;
    --color-success-text: #86efac;
    --color-danger-bg: #450a0a;
    --color-danger-text: #fca5a5;
    --color-info-bg: #1e3a5f;
    --color-info-text: #93c5fd;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    transition: background var(--transition-normal), color var(--transition-normal);
}

/* ===== Layout ===== */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
}

/* ===== Header ===== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

h1 {
    font-size: var(--text-3xl);
    font-weight: 600;
    color: var(--color-text);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* ===== Auto Refresh Toggle ===== */
.auto-refresh-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-md);
    color: var(--color-text-secondary);
}

.toggle-switch {
    position: relative;
    width: 40px;
    height: 22px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--color-toggle-off);
    border-radius: 22px;
    transition: var(--transition-normal);
}

.toggle-slider:before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    left: 3px;
    bottom: 3px;
    background: var(--color-surface);
    border-radius: var(--radius-full);
    transition: var(--transition-normal);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--color-primary);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(18px);
}

.countdown {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--text-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn-primary {
    padding: 10px 10px;
    font-size: var(--text-sm);
}

.btn-danger {
    background: var(--color-danger);
    color: var(--color-surface);
}

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

.btn-secondary {
    background: var(--color-border);
    color: var(--color-text-dark);
}

.btn-secondary:hover {
    background: var(--color-toggle-off);
}

#themeToggle,
.header-controls > button:last-child {
    justify-content: center;
}

.btn-sm {
    padding: 10px 10px;
    font-size: var(--text-sm);
}

.btn-icon {
    padding: 10px 12px;
    font-size: var(--text-lg);
    line-height: 1;
}

/* ===== Relay Cards ===== */
.relay-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: background var(--transition-normal), border-color var(--transition-normal);
}

.relay-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--color-border-light);
}

.relay-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.relay-status-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.relay-status-dot.online {
    background: var(--color-success);
}

.relay-status-dot.offline {
    background: var(--color-danger);
}

.relay-name {
    font-size: var(--text-lg);
    font-weight: 600;
}

.relay-ip {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.relay-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.relay-channels {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-xl);
}

/* ===== Channel Cards ===== */
.channel-card {
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex: 1;
    min-width: 0;
    transition: background var(--transition-normal), border-color var(--transition-normal);
}

/* ===== Channel Toggle Switch ===== */
.channel-toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
    cursor: pointer;
}

.channel-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.channel-toggle .toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-danger);
    border-radius: 22px;
    transition: background 0.3s;
}

.channel-toggle .toggle-slider::before {
    content: '';
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: #ffffff;
    border-radius: var(--radius-full);
    transition: transform 0.3s;
}

.channel-toggle input:checked + .toggle-slider {
    background: var(--color-success);
}

.channel-toggle input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.channel-toggle.pending .toggle-slider,
.channel-toggle.pending input:checked + .toggle-slider {
    background: #f59e0b !important;
}

@keyframes togglePulse {
    0%, 100% { background-color: #f59e0b; }
    50% { background-color: #d97706; }
}

.channel-toggle.pending .toggle-slider {
    animation: togglePulse 1s ease-in-out infinite;
}

.channel-name {
    font-size: var(--text-md);
    font-weight: 500;
    color: var(--color-text-dark);
    cursor: pointer;
    padding: 2px 4px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.channel-name:hover {
    background: var(--color-border);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: var(--space-5xl) var(--space-xl);
    color: var(--color-text-muted);
}

.empty-state-icon {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-lg);
}

.last-update {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

/* ===== Refresh Spinner ===== */
.refresh-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid var(--color-toggle-off);
    border-top-color: #0ea5e9;
    border-radius: var(--radius-full);
    animation: spin 0.6s linear infinite;
}

/* ===== Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    z-index: 100;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    padding: var(--space-2xl);
}

.modal-title {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-2xl);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-md);
    outline: none;
    transition: border-color var(--transition-fast);
    background: var(--color-surface);
    color: var(--color-text);
}

.form-group input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 400;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-md) var(--space-lg);
    min-width: 280px;
    max-width: 380px;
    border-left: 4px solid var(--color-primary);
    animation: slideIn var(--transition-normal) ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toast.success {
    border-left-color: var(--color-success);
}

.toast.error {
    border-left-color: var(--color-danger);
}

.toast-close {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 0 0 0 var(--space-sm);
}

.toast-timer {
    height: 3px;
    background: var(--color-border);
    border-radius: var(--radius-sm);
    margin-top: var(--space-sm);
    overflow: hidden;
}

.toast-timer-bar {
    height: 100%;
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    animation: timerShrink 10s linear forwards;
}

.toast.success .toast-timer-bar {
    background: var(--color-success);
}

.toast.error .toast-timer-bar {
    background: var(--color-danger);
}

/* ===== Logs Section ===== */
.logs-section {
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-4xl);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.section-icon {
    font-size: var(--text-2xl);
}

.logs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

.logs-controls {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logs-count {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.logs-container {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.logs-empty {
    padding: var(--space-2xl);
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--text-md);
}

.log-entry {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: 10px 16px;
    border-bottom: 1px solid var(--color-border-light);
    font-size: var(--text-sm);
    line-height: 1.5;
    transition: background var(--transition-fast);
}

.log-entry:last-child {
    border-bottom: none;
}

.log-entry:hover {
    background: var(--color-surface-alt);
}

.log-level {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 22px;
    padding: 0 6px;
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    font-weight: 600;
    flex-shrink: 0;
}

.log-level.info {
    background: var(--color-info-bg);
    color: var(--color-info-text);
}

.log-level.error {
    background: var(--color-danger-bg);
    color: var(--color-danger-hover);
}

.log-time {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    white-space: nowrap;
    flex-shrink: 0;
}

.log-message {
    flex: 1;
    color: var(--color-text-dark);
}

.log-ip {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ===== Mobile Layout ===== */
@media (max-width: 768px) {
    .container {
        padding: var(--space-lg) var(--space-md);
    }

    /* Header: 3 rows on mobile */
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
        margin-bottom: var(--space-xl);
    }

    .header-controls {
        flex-wrap: wrap;
        width: 100%;
        row-gap: var(--space-sm);
    }

    /* Row 2: Автообновление */
    .auto-refresh-toggle {
        order: -1;
        width: 100%;
        justify-content: flex-end;
    }

    /* Row 3: Добавить реле + тема + выход */
    header .btn-primary,
    #themeToggle,
    .header-controls > button:last-child {
        flex: 1;
        min-width: 0;
        justify-content: center;
        text-wrap: nowrap;
    }

    /* ===== Relay Card Actions on separate row ===== */
    .relay-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }

    .relay-actions {
        width: 100%;
        flex-wrap: wrap;
        gap: var(--space-sm);
    }

    .relay-actions .btn {
        flex: 1;
        min-width: 0;
        justify-content: center;
    }

    /* ===== Channels on separate rows ===== */
    .relay-channels {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .channel-card {
        flex: none;
        width: 100%;
    }

    /* ===== Logs: icon+time+IP on row 1, message on row 2 ===== */
    .log-entry {
        flex-direction: column;
        gap: var(--space-xs);
        padding: var(--space-md) var(--space-lg);
    }

    .log-top-row {
        display: flex;
        align-items: center;
        gap: var(--space-sm);
        width: 100%;
    }

    .log-message {
        margin-left: 0;
    }

    /* Logs header mobile */
    .logs-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .logs-controls {
        width: 100%;
        justify-content: space-between;
    }

    /* Modal mobile */
    .modal {
        margin: var(--space-md);
        padding: var(--space-lg);
    }

    h1 {
        font-size: var(--text-2xl);
    }
}

/* ===== Animations ===== */
@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes timerShrink {
    from {
        width: 100%;
    }
    to {
        width: 0%;
    }
}

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

/* ===== Login ===== */
.login-container {
    display: flex;
    position: fixed;
    inset: 0;
    background: var(--color-bg);
    z-index: 300;
    justify-content: center;
    align-items: center;
}

.login-container.hidden {
    display: none;
}

.login-box {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-3xl);
    width: 100%;
    max-width: 360px;
    text-align: center;
}

.login-box h2 {
    margin-bottom: var(--space-2xl);
    font-size: var(--text-3xl);
}