:root {
    --bg-dark: #0f111a;
    --bg-surface: #181926;
    --bg-card: #1e2030;
    --bg-card-hover: #24273a;
    --bg-input: #141522;
    --border-color: #2e324d;
    --border-focus: #89b4fa;
    --primary: #89b4fa;
    --primary-hover: #74c7ec;
    --primary-glow: rgba(137, 180, 250, 0.25);
    --secondary: #313244;
    --accent: #cba6f7;
    --success: #a6e3a1;
    --warning: #f9e2af;
    --danger: #f38ba8;
    --text-primary: #cad3f5;
    --text-secondary: #a5adcb;
    --text-muted: #6e738d;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(137, 180, 250, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(203, 166, 247, 0.08) 0%, transparent 40%);
    background-attachment: fixed;
}

.app-container {
    width: 100%;
    max-width: 960px;
    padding: 24px 20px 40px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    margin-bottom: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    position: relative;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #111;
    font-size: 20px;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.pulse-dot {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 10px;
    height: 10px;
    background: var(--success);
    border-radius: 50%;
    border: 2px solid var(--bg-surface);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(166, 227, 161, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(166, 227, 161, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(166, 227, 161, 0); }
}

.brand-text h1 {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.brand-text h1 span {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-text .tagline {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

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

.api-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
}

.status-indicator.online {
    background: var(--success);
    box-shadow: 0 0 8px rgba(166, 227, 161, 0.6);
}

.status-indicator.offline {
    background: var(--danger);
}

/* Tabs */
.tabs-nav {
    display: flex;
    gap: 8px;
    background: var(--bg-surface);
    padding: 6px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
    background: var(--primary);
    color: #111;
    box-shadow: 0 4px 15px var(--primary-glow);
}

/* Tab panes */
.tab-pane {
    display: none;
    flex-direction: column;
    gap: 20px;
}

.tab-pane.active {
    display: flex;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.card-header h2, .card-header h3 {
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.editor-tools {
    display: flex;
    gap: 8px;
}

.tool-btn {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    cursor: pointer;
    font-family: var(--font-main);
    transition: var(--transition);
}

.tool-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

.tool-btn.text-danger:hover {
    border-color: var(--danger);
    color: var(--danger);
}

/* Textarea */
.textarea-wrapper {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.textarea-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

textarea#ttsTextInput {
    width: 100%;
    min-height: 140px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 15px;
    font-family: var(--font-main);
    line-height: 1.6;
    resize: vertical;
    outline: none;
}

textarea#ttsTextInput::placeholder {
    color: var(--text-muted);
}

.textarea-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 12px;
    color: var(--text-muted);
}

/* Controls Grid */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.control-group {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.select-wrapper select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-main);
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}

.select-wrapper select:focus {
    border-color: var(--primary);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge-value {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-family: var(--font-mono);
    color: var(--primary);
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 4px;
    outline: none;
    margin: 8px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 8px var(--primary-glow);
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #74c7ec);
    color: #111;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: #3c3e56;
    color: #fff;
}

.btn-success {
    background: var(--success);
    color: #111;
    box-shadow: 0 4px 15px rgba(166, 227, 161, 0.3);
}

.btn-success:hover {
    filter: brightness(1.1);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

.btn-large {
    width: 100%;
    padding: 16px 24px;
    font-size: 16px;
    border-radius: var(--radius-md);
}

/* Result Card */
.result-card {
    border-color: var(--success);
    background: linear-gradient(180deg, rgba(166, 227, 161, 0.05) 0%, var(--bg-card) 100%);
    animation: slideUp 0.35s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.result-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.result-title i {
    font-size: 28px;
}

.result-title h3 {
    font-size: 16px;
    font-weight: 700;
}

.sub-result {
    font-size: 12px;
    color: var(--text-muted);
}

.audio-player-container audio {
    width: 100%;
    border-radius: 30px;
    outline: none;
}

/* History Card */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    transition: var(--transition);
}

.history-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.history-info {
    flex: 1;
    overflow: hidden;
    margin-right: 12px;
}

.history-text {
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
}

.history-meta {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

.history-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.empty-history {
    text-align: center;
    padding: 32px 16px;
    color: var(--text-muted);
}

.empty-history i {
    font-size: 32px;
    margin-bottom: 8px;
    opacity: 0.5;
}

/* Chat Card */
.chat-card {
    height: 600px;
    display: flex;
    flex-direction: column;
}

.chat-header-info h2 {
    font-size: 17px;
    font-weight: 700;
}

.chat-header-info p {
    font-size: 12px;
    color: var(--text-muted);
}

.toggle-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 12px;
    user-select: none;
}

.toggle-switch input {
    display: none;
}

.toggle-switch .slider {
    width: 38px;
    height: 20px;
    background: var(--secondary);
    border-radius: 20px;
    position: relative;
    transition: var(--transition);
}

.toggle-switch .slider:before {
    content: '';
    position: absolute;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    left: 3px;
    top: 3px;
    background: #fff;
    transition: var(--transition);
}

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

.toggle-switch input:checked + .slider:before {
    transform: translateX(18px);
    background: #111;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px 8px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    gap: 12px;
    max-width: 80%;
}

.bot-message {
    align-self: flex-start;
}

.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.bot-message .message-avatar {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #111;
}

.user-message .message-avatar {
    background: var(--secondary);
    color: var(--text-primary);
}

.message-content {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 12px 16px;
    font-size: 14px;
}

.user-message .message-content {
    background: var(--primary);
    color: #111;
    border-color: transparent;
}

.message-time {
    display: block;
    font-size: 10px;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: right;
}

.user-message .message-time {
    color: rgba(0, 0, 0, 0.6);
}

.chat-input-bar {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
}

.chat-input-bar input {
    flex: 1;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-main);
    outline: none;
    transition: var(--transition);
}

.chat-input-bar input:focus {
    border-color: var(--primary);
}

/* Docs & Cloudflare */
.docs-card h2 {
    font-size: 20px;
    margin-bottom: 8px;
}

.lead {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.steps-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
}

.step-item {
    display: flex;
    gap: 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
}

.step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: #111;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-body h4 {
    font-size: 15px;
    margin-bottom: 4px;
}

.step-body p {
    font-size: 13px;
    color: var(--text-secondary);
}

.step-body code {
    background: var(--bg-input);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    color: var(--primary);
}

.step-body a {
    color: var(--primary);
    text-decoration: underline;
}

.api-docs-preview {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
}

.api-docs-preview h3 {
    font-size: 15px;
    margin-bottom: 12px;
}

.endpoint-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 13px;
}

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

.method {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
}

.method.post {
    background: rgba(166, 227, 161, 0.2);
    color: var(--success);
}

.method.get {
    background: rgba(137, 180, 250, 0.2);
    color: var(--primary);
}

.endpoint-item code {
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-weight: 600;
}

.endpoint-item p {
    color: var(--text-muted);
}

/* Footer */
.app-footer {
    text-align: center;
    padding-top: 32px;
    font-size: 12px;
    color: var(--text-muted);
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 16px;
}

.close-modal-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}

.close-modal-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 20px 24px;
}

.modal-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
}

.form-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-mono);
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary);
}

.presets-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 12px;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.preset-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    cursor: pointer;
}

.preset-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

.test-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.test-result {
    font-size: 12px;
    font-weight: 500;
}

.test-result.success {
    color: var(--success);
}

.test-result.error {
    color: var(--danger);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    padding: 14px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-surface);
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 10000;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: toastIn 0.3s ease;
}

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

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

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

/* Helpers */
.hidden {
    display: none !important;
}

.text-accent {
    color: var(--accent);
}

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

.text-muted {
    color: var(--text-muted);
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
    .navbar {
        flex-direction: column;
        gap: 14px;
        align-items: flex-start;
    }
    
    .nav-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .tabs-nav {
        flex-direction: column;
    }
    
    .controls-grid {
        grid-template-columns: 1fr;
    }
    
    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .result-actions {
        width: 100%;
    }
    
    .result-actions a {
        width: 100%;
    }
}