:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #6b7280;
    --secondary-hover: #4b5563;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --background: #f3f4f6;
    --card-background: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --input-background: #ffffff;
    --input-border: #d1d5db;
    --input-focus: #2563eb;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #111827;
        --card-background: #1f2937;
        --text-primary: #f9fafb;
        --text-secondary: #9ca3af;
        --border-color: #374151;
        --input-background: #374151;
        --input-border: #4b5563;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.header-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lang-selector {
    padding: 6px 10px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    background: var(--input-background);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.lang-selector:hover {
    border-color: var(--primary-color);
}

.lang-selector:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.github-link {
    color: var(--text-secondary);
    transition: color 0.2s ease;
    display: flex;
    align-items: center;
}

.github-link:hover {
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 8px;
}

/* Browser Warning */
.warning-card {
    background: #fef3c7;
    border: 1px solid #f59e0b;
}

.warning-card h2 {
    color: #92400e;
    border-bottom-color: #fcd34d;
}

.warning-card p {
    color: #78350f;
}

.warning-card a {
    color: #92400e;
    font-weight: 600;
    text-decoration: underline;
}

.warning-card a:hover {
    color: #78350f;
}

@media (prefers-color-scheme: dark) {
    .warning-card {
        background: #451a03;
        border-color: #b45309;
    }

    .warning-card h2 {
        color: #fcd34d;
        border-bottom-color: #b45309;
    }

    .warning-card p {
        color: #fde68a;
    }

    .warning-card a {
        color: #fcd34d;
    }

    .warning-card a:hover {
        color: #fde68a;
    }
}

.card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

/* Section header with advanced toggle */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.advanced-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: normal;
    color: var(--text-secondary);
    cursor: pointer;
}

.advanced-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.advanced-settings {
    background: var(--background);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
}

.advanced-settings small {
    display: block;
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.hidden {
    display: none !important;
}

/* Connection Status */
.connection-status {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding: 12px;
    background: var(--background);
    border-radius: 8px;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

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

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

.status-dot.connecting {
    background: var(--warning-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Buttons */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.button-group-split {
    justify-content: space-between;
}

.button-group-right {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-hover);
}

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

.btn-warning:hover:not(:disabled) {
    background: var(--warning-hover);
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

/* Toggle button for Keep Awake */
.btn-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--secondary-color);
    color: white;
    font-weight: 600;
}

.btn-toggle:hover:not(:disabled) {
    background: var(--secondary-hover);
}

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

.btn-toggle.active:hover:not(:disabled) {
    background: #059669;
}

.btn-icon {
    flex-shrink: 0;
}

/* Light bulb icon states */
.btn-toggle .btn-icon-on {
    display: none;
}

.btn-toggle .btn-icon-off {
    display: block;
}

.btn-toggle.active .btn-icon-on {
    display: block;
}

.btn-toggle.active .btn-icon-off {
    display: none;
}

/* Device Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-item label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.info-item span {
    font-size: 1rem;
    font-weight: 600;
}

/* Form Styles */
fieldset {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
}

legend {
    padding: 0 8px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 16px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group label.required::after {
    content: ' *';
    color: var(--danger-color);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="url"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--input-background);
    color: var(--text-primary);
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input.input-error {
    border-color: var(--danger-color);
    background-color: rgba(239, 68, 68, 0.05);
}

.form-group input.input-error:focus {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* Password input with toggle */
.password-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input-wrapper input {
    padding-right: 44px;
}

.password-toggle-btn {
    position: absolute;
    right: 8px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.password-toggle-btn:hover {
    color: var(--text-primary);
}

.password-toggle-btn .eye-closed {
    display: none;
}

.password-toggle-btn.showing .eye-open {
    display: none;
}

.password-toggle-btn.showing .eye-closed {
    display: block;
}

.form-group input[type="range"] {
    width: calc(100% - 50px);
    vertical-align: middle;
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

@media (max-width: 500px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    margin-bottom: 0 !important;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

#brightness-value {
    display: inline-block;
    width: 40px;
    text-align: right;
    font-weight: 600;
}

/* OTA Section */
.ota-info {
    margin-bottom: 16px;
}

.ota-status {
    margin: 16px 0;
}

.progress-container {
    background: var(--background);
    border-radius: 8px;
    height: 20px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-bar {
    background: var(--primary-color);
    height: 100%;
    width: 0%;
    border-radius: 8px;
    transition: width 0.3s ease;
}

#ota-progress-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.warning-text {
    color: var(--warning-color);
    font-weight: 500;
}

.success-text {
    color: var(--success-color);
    font-weight: 500;
}

/* Code block for CLI commands */
.code-block {
    background: #1e1e1e;
    color: #d4d4d4;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    padding: 12px 16px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 12px 0;
}

/* OTA update info section */
.ota-update-info {
    margin-top: 16px;
    padding: 16px;
    background: var(--background);
    border-radius: 8px;
}

.ota-update-info p {
    margin-bottom: 8px;
}

.ota-update-info a {
    color: var(--primary-color);
    text-decoration: none;
}

.ota-update-info a:hover {
    text-decoration: underline;
}

/* Log Output */
.log-output {
    background: #1e1e1e;
    color: #d4d4d4;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    padding: 12px;
    border-radius: 6px;
    height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

.log-output .log-info {
    color: #4fc3f7;
}

.log-output .log-success {
    color: #81c784;
}

.log-output .log-warning {
    color: #ffb74d;
}

.log-output .log-error {
    color: #e57373;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 12px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: 16px;
    }

    .button-group {
        flex-direction: column;
    }

    .button-group-right {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }
}