/* CSS variables for consistent theming and design system */
:root {
    --bg-app: #090d16;
    --bg-sidebar: #0f1524;
    --bg-card: rgba(22, 30, 49, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.16);
    
    /* Typography colors */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Branding and accent colors */
    --primary: #6366f1; /* Indigo */
    --primary-hover: #4f46e5;
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --primary-gradient-hover: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
    
    --secondary: #1e293b;
    --secondary-hover: #334155;
    
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --danger-bg-subtle: rgba(239, 68, 68, 0.15);
    
    --success: #10b981;
    
    /* Shadows and Borders */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 15px rgba(99, 102, 241, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout Structure */
.app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
    width: 320px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 10;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: 24px 20px 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-primary);
}

.logo-icon {
    color: var(--primary);
    filter: drop-shadow(0 0 4px rgba(99, 102, 241, 0.4));
}

.search-bar {
    padding: 0 20px 16px 20px;
    position: relative;
}

.search-bar input {
    width: 100%;
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px 10px 38px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary);
    background-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.search-icon {
    position: absolute;
    left: 32px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.history-list-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 0 12px 24px 12px;
}

/* Custom scrollbar for sidebar history list */
.history-list-wrapper::-webkit-scrollbar {
    width: 6px;
}

.history-list-wrapper::-webkit-scrollbar-track {
    background: transparent;
}

.history-list-wrapper::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}

.history-list-wrapper::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

.history-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.empty-state {
    color: var(--text-muted);
    text-align: center;
    padding: 40px 20px;
    font-size: 0.875rem;
    font-style: italic;
}

.history-item {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 6px;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.history-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.history-item.active {
    background-color: rgba(99, 102, 241, 0.08);
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.05);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.history-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.history-voice-badge {
    font-size: 0.7rem;
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-full);
    max-width: 120px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item-body {
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.history-item-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.history-item:hover .history-item-actions {
    opacity: 1;
}

.history-action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.history-action-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.08);
}

.history-action-btn.btn-delete:hover {
    color: var(--danger);
    background-color: var(--danger-bg-subtle);
}

.history-action-btn.btn-favorite.is-favorite {
    color: #eab308; /* Yellow */
}

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    background-image: radial-gradient(circle at top right, rgba(99, 102, 241, 0.05), transparent 400px),
                      radial-gradient(circle at bottom left, rgba(168, 85, 247, 0.03), transparent 300px);
}

.app-header {
    padding: 32px 40px 16px 40px;
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 4px;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Content Grid */
.content-grid {
    flex: 1;
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 24px;
    padding: 24px 40px;
    overflow-y: auto;
    align-content: start;
    padding-bottom: 120px; /* Leave space for controls bar */
}

/* Card General Styling */
.card {
    background-color: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.card h2 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

/* Text Input Card Specifics */
.input-card {
    min-height: 380px;
}

.textarea-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: rgba(0, 0, 0, 0.2);
    transition: all var(--transition-fast);
}

.textarea-container:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.15);
}

textarea {
    flex: 1;
    width: 100%;
    height: 100%;
    min-height: 240px;
    background: none;
    border: none;
    resize: none;
    color: var(--text-primary);
    padding: 16px;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.6;
}

textarea:focus {
    outline: none;
}

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

.textarea-footer {
    padding: 10px 16px;
    display: flex;
    justify-content: flex-end;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
}

#char-count {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Settings Card Specifics */
.settings-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    outline: none;
    width: 100%;
}

.settings-card-header h2 {
    margin: 0;
}

.settings-card-header:focus-visible {
    box-shadow: 0 0 0 2px var(--primary);
    border-radius: var(--radius-sm);
}

.chevron-icon {
    transition: transform var(--transition-normal);
    color: var(--text-secondary);
}

.settings-card:not(.collapsed) .chevron-icon {
    transform: rotate(180deg);
}

.settings-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-height: 1000px;
    opacity: 1;
    overflow: hidden;
    transition: max-height var(--transition-normal), opacity var(--transition-normal), margin-top var(--transition-normal);
    margin-top: 16px;
}

.settings-card.collapsed .settings-content {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    pointer-events: none;
}

.settings-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.settings-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: "";
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    border-left: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: translateY(-70%) rotate(-45deg);
    pointer-events: none;
    transition: border-color var(--transition-fast);
}

.select-wrapper:hover::after {
    border-color: var(--text-primary);
}

select {
    width: 100%;
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 40px 12px 16px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    transition: all var(--transition-fast);
}

select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.15);
}

select option {
    background-color: var(--bg-sidebar);
    color: var(--text-primary);
}

/* Range Slider Styling */
.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.slider-value {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    background-color: rgba(99, 102, 241, 0.1);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    margin: 10px 0;
    transition: background var(--transition-fast);
}

.slider:hover {
    background: rgba(255, 255, 255, 0.15);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.1s ease, background-color var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    background: var(--text-primary);
    box-shadow: var(--shadow-glow);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.1s ease, background-color var(--transition-fast);
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.15);
    background: var(--text-primary);
    box-shadow: var(--shadow-glow);
}

/* Button Styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-gradient-hover);
    box-shadow: var(--shadow-glow);
}

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

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

.btn-danger {
    background-color: var(--danger-bg-subtle);
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.2);
}

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

.btn-icon {
    width: 38px;
    height: 38px;
    padding: 0;
    border-radius: var(--radius-md);
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

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

.action-separator {
    color: var(--text-muted);
    opacity: 0.3;
    font-size: 0.85rem;
    user-select: none;
}

.btn-quick-speak {
    color: var(--primary);
    font-weight: 600;
}

.btn-quick-speak:hover {
    color: var(--text-primary);
    filter: drop-shadow(0 0 4px rgba(99, 102, 241, 0.6));
}

.btn-quick-speak.playing {
    color: var(--danger);
}

.btn-quick-speak.playing:hover {
    color: var(--danger-hover);
    filter: drop-shadow(0 0 4px rgba(239, 68, 68, 0.6));
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Playback Control Bar */
.controls-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(15, 21, 36, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-color);
    padding: 20px 40px;
    z-index: 5;
    box-shadow: 0 -10px 25px -5px rgba(0, 0, 0, 0.4);
}

.controls-inner {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.btn-large {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-lg);
}

/* Custom visual pulse effect for playing state */
#speak-btn.playing {
    animation: buttonPulse 2s infinite;
}

@keyframes buttonPulse {
    0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.6); }
    70% { box-shadow: 0 0 0 10px rgba(99, 102, 241, 0); }
    100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
}

/* Toast/Notification Popup Style */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
}

.toast {
    background-color: #1e293b;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

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

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

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

/* Quick Phrases Styles */
.quick-phrases-card {
    transition: all var(--transition-normal);
}

.quick-phrases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 12px;
}

.phrase-btn-wrapper {
    position: relative;
    display: flex;
}

.phrase-btn {
    width: 100%;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all var(--transition-fast);
}

.phrase-btn:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.phrase-btn:active {
    transform: translateY(0);
}

.phrase-btn .phrase-icon {
    font-size: 1.35rem;
}

.phrase-delete-btn {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background-color: var(--danger);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    box-shadow: var(--shadow-sm);
    opacity: 0;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.phrase-btn-wrapper:hover .phrase-delete-btn {
    opacity: 1;
}

.phrase-delete-btn:hover {
    background-color: var(--danger-hover);
    transform: scale(1.1);
}

/* Add custom phrase inline form */
.phrase-form {
    background-color: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 8px;
    animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.phrase-form input {
    width: 100%;
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    transition: border-color var(--transition-fast);
}

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

/* Checkbox container for auto-clear */
.checkbox-container {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.checkbox-container input {
    cursor: pointer;
    accent-color: var(--primary);
    width: 15px;
    height: 15px;
}

/* Bell button styles */
.btn-bell {
    color: #eab308; /* Yellow */
}

.btn-bell:hover {
    color: #facc15;
    filter: drop-shadow(0 0 4px rgba(234, 179, 8, 0.6));
}

.btn-bell:active .bell-icon {
    animation: ringBell 0.4s ease;
}

@keyframes ringBell {
    0% { transform: rotate(0); }
    20% { transform: rotate(15deg); }
    40% { transform: rotate(-15deg); }
    60% { transform: rotate(10deg); }
    80% { transform: rotate(-10deg); }
    100% { transform: rotate(0); }
}

/* Responsive Rules */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
        overflow: visible;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        order: 2;
        border-right: none;
        border-bottom: none;
        border-top: 1px solid var(--border-color);
        overflow: visible;
    }
    
    .sidebar-header {
        padding: 24px 16px 16px 16px;
    }
    
    .search-bar {
        padding: 0 16px 12px 16px;
    }
    
    .history-list-wrapper {
        padding: 0 16px 120px 16px; /* Extra padding at bottom to prevent floating buttons overlap */
        overflow-y: visible;
        height: auto;
    }
    
    .main-content {
        height: auto;
        overflow: visible;
        order: 1;
    }
    
    .app-header {
        padding: 24px 16px 16px 16px;
    }
    
    .content-grid {
        padding: 16px;
        padding-bottom: 24px;
        overflow-y: visible;
        height: auto;
    }
    
    .controls-bar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
        padding: 12px 16px;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.4);
    }
    
    .btn-large {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .card-header-actions .btn-text span {
        display: none;
    }
    .card-header-actions {
        gap: 8px;
    }
    .phrase-delete-btn {
        opacity: 0.8;
    }
}