:root {
    --bg-primary: #0a0b14;
    --bg-secondary: #131520;
    --bg-tertiary: #1c1f2e;
    --bg-hover: #252840;
    --text-primary: #e8eaf0;
    --text-secondary: #8b8fa3;
    --text-muted: #5a5e73;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-success: #22c55e;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    --border: #2a2d3f;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    font-size: 22px;
}

header h1 {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.cloud-status {
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    transition: var(--transition);
}

.cloud-status.connected {
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent-success);
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 20px;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

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

/* Layout */
.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.btn-small {
    background: var(--accent);
    color: white;
    border: none;
    padding: 5px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-small:hover {
    background: var(--accent-hover);
}

.articles-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 20px;
    font-size: 13px;
}

.article-item {
    display: flex;
    align-items: center;
    padding: 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 4px;
}

.article-item:hover {
    background: var(--bg-hover);
}

.article-info {
    flex: 1;
    min-width: 0;
}

.article-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.article-date {
    font-size: 11px;
    color: var(--text-muted);
}

.delete-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 18px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
    opacity: 0;
    line-height: 1;
}

.article-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    color: var(--accent-danger);
    background: rgba(239, 68, 68, 0.1);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 20px;
    gap: 14px;
}

.editor-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 0;
}

.title-input {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    font-family: inherit;
    transition: var(--transition);
}

.title-input:focus {
    outline: none;
    border-color: var(--accent);
}

.text-area {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    color: var(--text-primary);
    font-size: 15px;
    line-height: 1.7;
    resize: none;
    transition: var(--transition);
    font-family: inherit;
}

.text-area:focus {
    outline: none;
    border-color: var(--accent);
}

.word-count {
    font-size: 12px;
    color: var(--text-muted);
    text-align: right;
}

/* Controls */
.controls-section {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group > label {
    font-size: 10px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    font-weight: 600;
}

.select-control {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.select-control:focus {
    outline: none;
    border-color: var(--accent);
}

.toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
    height: 36px;
}

.toggle input {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}

.play-controls {
    flex-direction: row;
    align-items: flex-end;
    gap: 8px;
    margin-left: auto;
}

.btn-play, .btn-pause, .btn-stop, .btn-save {
    border: none;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: inherit;
}

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

.btn-play:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

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

.btn-pause:hover {
    background: #fbbf24;
}

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

.btn-stop:hover {
    background: var(--bg-hover);
}

.btn-save {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 9px 20px;
}

.btn-save:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
}

/* Progress */
.progress-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-bar-container {
    flex: 1;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    border-radius: 3px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
    min-width: 100px;
    text-align: right;
}

/* Current Sentence Display */
.current-sentence {
    min-height: 56px;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    font-style: italic;
    transition: var(--transition);
}

.current-sentence:empty {
    display: none;
}

/* Action Bar */
.action-bar {
    display: flex;
    justify-content: flex-end;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
    animation: fadeIn 0.2s ease;
}

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

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 440px;
    width: 90%;
    box-shadow: var(--shadow);
    animation: slideUp 0.25s ease;
}

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

.modal-content h2 {
    font-size: 18px;
    margin-bottom: 8px;
}

.modal-content p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.token-input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    margin-bottom: 20px;
}

.token-input:focus {
    outline: none;
    border-color: var(--accent);
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    font-family: inherit;
}

.btn-secondary:hover {
    background: var(--bg-hover);
}

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition);
    font-family: inherit;
}

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

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    box-shadow: var(--shadow);
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .controls-section {
        gap: 12px;
    }

    .play-controls {
        margin-left: 0;
        width: 100%;
        justify-content: center;
    }

    .main-content {
        padding: 12px;
    }
}