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

:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --danger: #DC2626;
    --danger-hover: #B91C1C;
    --secondary: #6B7280;
    --secondary-hover: #4B5563;
    --bg: #F9FAFB;
    --card: #FFFFFF;
    --text: #111827;
    --text-light: #6B7280;
    --border: #E5E7EB;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --host-color: #2563EB;
    --expert-color: #059669;
}

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

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 24px;
    position: relative;
}

header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-light);
    font-size: 14px;
}

/* Settings Gear Button */
.btn-settings {
    position: absolute;
    top: 0;
    right: 0;
    background: none;
    border: 2px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-light);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-settings:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: #EEF2FF;
}

/* Settings Modal */
.settings-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.settings-overlay.visible {
    display: flex;
}

.settings-panel {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.settings-panel h2 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--text);
}

.setting-row {
    margin-bottom: 16px;
}

.setting-row label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.setting-row input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.setting-row input:focus {
    outline: none;
    border-color: var(--primary);
}

.setting-hint {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

.settings-note {
    font-size: 12px;
    color: var(--text-light);
    background: #F3F4F6;
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 16px;
    line-height: 1.5;
}

.settings-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 4px;
    background: var(--border);
    border-radius: var(--radius);
    padding: 4px;
    margin-bottom: 16px;
}

.tab {
    flex: 1;
    padding: 10px 8px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s;
}

.tab.active {
    background: var(--card);
    color: var(--text);
    box-shadow: var(--shadow);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Mode Switch */
.mode-switch {
    display: flex;
    gap: 4px;
    background: var(--border);
    border-radius: var(--radius);
    padding: 4px;
    margin-top: 16px;
}

.mode-btn {
    flex: 1;
    padding: 10px 8px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s;
}

.mode-btn.active {
    background: var(--card);
    color: var(--text);
    box-shadow: var(--shadow);
}

.mode-btn.disabled {
    opacity: 0.5;
    cursor: default;
}

/* Text Input */
#text-input {
    width: 100%;
    min-height: 150px;
    padding: 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 16px;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s;
    background: var(--card);
}

#text-input:focus {
    outline: none;
    border-color: var(--primary);
}

/* File Upload */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--card);
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary);
    background: #EEF2FF;
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 8px;
}

.upload-area p {
    color: var(--text-light);
    font-size: 15px;
}

.file-types {
    font-size: 13px !important;
    margin-top: 8px;
}

.file-name {
    margin-top: 8px;
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    text-align: center;
}

/* URL Input */
.url-input-group {
    display: flex;
    gap: 8px;
}

.url-input-group input {
    flex: 1;
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 16px;
    background: var(--card);
    transition: border-color 0.2s;
}

.url-input-group input:focus {
    outline: none;
    border-color: var(--primary);
}

/* Status */
.status {
    text-align: center;
    padding: 8px;
    font-size: 14px;
    color: var(--text-light);
    display: none;
}

.status.visible {
    display: block;
}

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

.status .spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

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

/* Text Preview */
.text-preview {
    display: none;
    margin-top: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    overflow: hidden;
}

.text-preview.visible {
    display: block;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: #F3F4F6;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-light);
    border-bottom: 1px solid var(--border);
}

.char-count {
    font-weight: 400;
}

.preview-body {
    padding: 14px;
    max-height: 300px;
    overflow-y: auto;
    font-size: 14px;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Dialogue Preview */
.dialogue-line {
    display: flex;
    gap: 10px;
    padding: 10px 12px;
    border-bottom: 1px solid #F3F4F6;
    transition: background 0.3s;
    align-items: flex-start;
    white-space: normal;
}

.dialogue-line:last-child {
    border-bottom: none;
}

.dialogue-line.active {
    background: #FEF9C3;
}

.speaker-badge {
    flex-shrink: 0;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 2px;
}

.speaker-badge.host {
    background: #DBEAFE;
    color: var(--host-color);
}

.speaker-badge.expert {
    background: #D1FAE5;
    color: var(--expert-color);
}

.dialogue-text {
    flex: 1;
    font-size: 14px;
    line-height: 1.6;
}

/* Controls */
.controls {
    margin-top: 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.control-row:last-child {
    margin-bottom: 0;
}

.control-row label {
    min-width: 50px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-light);
}

.control-row select {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: var(--bg);
    color: var(--text);
    appearance: auto;
}

.control-row select optgroup {
    font-weight: 700;
    font-style: normal;
}

/* Voice Tip */
.voice-tip {
    font-size: 12px;
    padding: 8px 12px;
    border-radius: 8px;
    margin-bottom: 12px;
    line-height: 1.5;
}

.voice-tip.success {
    background: #ECFDF5;
    color: #065F46;
}

.voice-tip.info {
    background: #EFF6FF;
    color: #1E40AF;
}

.voice-tip:empty {
    display: none;
}

.range-group {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
}

.range-group input[type="range"] {
    flex: 1;
    accent-color: var(--primary);
    height: 6px;
}

.range-group span {
    min-width: 36px;
    font-size: 13px;
    color: var(--text-light);
    text-align: right;
}

/* Buttons */
.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    justify-content: center;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

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

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

.btn-secondary {
    background: #E5E7EB;
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: #D1D5DB;
}

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

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

.btn-icon {
    font-size: 12px;
}

.btn-small {
    padding: 8px 12px;
    font-size: 13px;
    flex-shrink: 0;
}

/* Playback */
.playback {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

.playback .btn {
    flex: 1;
}

/* Progress */
.progress-container {
    display: none;
    margin-top: 12px;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-container.visible {
    display: block;
}

.progress-bar {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    width: 0%;
    transition: width 0.3s;
}

/* Responsive */
@media (min-width: 768px) {
    .container {
        padding: 40px 24px 60px;
    }

    header h1 {
        font-size: 32px;
    }

    #text-input {
        min-height: 180px;
    }
}

@media (max-width: 380px) {
    .playback {
        flex-direction: column;
    }

    .tab, .mode-btn {
        font-size: 13px;
        padding: 8px 4px;
    }
}