/* ===========================
   VoiceCalc+ Styles
   Apple-inspired design
   =========================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #1c1c1e;
    --color-surface: rgba(28, 28, 30, 0.72);
    --color-surface-hover: rgba(44, 44, 46, 0.72);
    --color-text-primary: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-accent-blue: #0a84ff;
    --color-accent-green: #30d158;
    --color-accent-yellow: #ffd60a;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-shadow: rgba(0, 0, 0, 0.5);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px var(--color-shadow);
    --shadow-md: 0 8px 24px var(--color-shadow);
    --shadow-lg: 0 16px 48px var(--color-shadow);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', 'Segoe UI', 'Roboto', sans-serif;
    background: linear-gradient(135deg, var(--color-bg) 0%, #1a1a2e 100%);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
    max-width: 680px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.title-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.app-title {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-green) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-title .plus {
    font-weight: 300;
}

.session-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(48, 209, 88, 0.15);
    border: 1px solid var(--color-accent-green);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent-green);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tagline {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* Compatibility Notice */
.compatibility-notice {
    background: rgba(255, 214, 10, 0.15);
    border: 1px solid var(--color-accent-yellow);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(20px);
    animation: slideDown 0.3s ease;
}

.compatibility-notice.hidden {
    display: none;
}

.notice-content {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.notice-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.notice-content p {
    color: var(--color-text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Main Card */
.main-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(40px) saturate(180%);
    box-shadow: var(--shadow-lg);
}

/* Voice Section */
.voice-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.mic-button {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-accent-blue), #0066cc);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    transition: all var(--transition-normal);
    box-shadow: 0 8px 32px rgba(10, 132, 255, 0.4);
    position: relative;
}

.mic-button:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(10, 132, 255, 0.6);
}

.mic-button:active {
    transform: scale(0.95);
}

.mic-button:focus {
    outline: 3px solid var(--color-accent-blue);
    outline-offset: 4px;
}

.mic-button.listening {
    background: linear-gradient(135deg, var(--color-accent-green), #28a745);
    animation: pulse 1.5s ease-in-out infinite;
    box-shadow: 0 0 0 0 rgba(48, 209, 88, 0.7);
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(48, 209, 88, 0.7);
    }
    50% {
        box-shadow: 0 0 0 20px rgba(48, 209, 88, 0);
    }
}

.mic-button.hidden {
    display: none;
}

.mic-icon {
    width: 48px;
    height: 48px;
    color: white;
}

.voice-status {
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Input Section */
.input-section {
    margin-bottom: var(--spacing-xl);
}

.input-label {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.manual-input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 1.1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

.manual-input:focus {
    outline: none;
    border-color: var(--color-accent-blue);
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}

.process-button {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-accent-blue);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.process-button:hover {
    background: #0066cc;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.process-button:active {
    transform: translateY(0);
}

.process-button:focus {
    outline: 3px solid rgba(10, 132, 255, 0.5);
    outline-offset: 2px;
}

/* Section Title */
.section-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

/* Quick Actions */
.quick-actions {
    margin-bottom: var(--spacing-xl);
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.action-btn {
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.action-btn:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent-blue);
    transform: translateY(-2px);
}

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

.action-btn:focus {
    outline: 2px solid var(--color-accent-blue);
    outline-offset: 2px;
}

.action-icon {
    font-size: 1.5rem;
}

/* Result Section */
.result-section {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.result-content {
    position: relative;
}

.result-label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent-blue);
    letter-spacing: -0.02em;
    word-wrap: break-word;
    transition: all var(--transition-normal);
}

.speak-button {
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: var(--color-accent-blue);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.speak-button:hover {
    background: #0066cc;
    transform: translateY(-50%) scale(1.1);
}

.speak-button:focus {
    outline: 2px solid var(--color-accent-blue);
    outline-offset: 3px;
}

.speak-button svg {
    width: 20px;
    height: 20px;
    color: white;
}

.speak-button.hidden {
    display: none;
}

/* History Section */
.history-section {
    margin-bottom: var(--spacing-lg);
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.clear-button {
    padding: 0.5rem 1rem;
    background: rgba(255, 59, 48, 0.15);
    border: 1px solid rgba(255, 59, 48, 0.3);
    border-radius: var(--radius-sm);
    color: #ff3b30;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-button:hover {
    background: rgba(255, 59, 48, 0.25);
    border-color: rgba(255, 59, 48, 0.5);
}

.clear-button:focus {
    outline: 2px solid #ff3b30;
    outline-offset: 2px;
}

.history-list {
    list-style: none;
    max-height: 300px;
    overflow-y: auto;
}

.history-list::-webkit-scrollbar {
    width: 8px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
    border-radius: 4px;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

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

.history-item {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.history-item:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent-blue);
}

.history-query {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
}

.history-result {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Settings Card */
.settings-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(40px) saturate(180%);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 1rem;
    color: var(--color-text-primary);
}

.toggle-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: relative;
    width: 52px;
    height: 32px;
    background: var(--color-bg-secondary);
    border-radius: 16px;
    transition: background var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 28px;
    height: 28px;
    left: 2px;
    top: 2px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider {
    background: var(--color-accent-green);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.toggle-label input[type="checkbox"]:focus + .toggle-slider {
    outline: 2px solid var(--color-accent-blue);
    outline-offset: 2px;
}

/* Privacy Notice */
.privacy-notice {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(40px) saturate(180%);
}

.privacy-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent-green);
}

.privacy-text {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.privacy-text strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

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

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

/* Responsive Design */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .app-title {
        font-size: 2.5rem;
    }
    
    .main-card {
        padding: var(--spacing-lg);
    }
    
    .mic-button {
        width: 100px;
        height: 100px;
    }
    
    .mic-icon {
        width: 40px;
        height: 40px;
    }
    
    .result-value {
        font-size: 2rem;
    }
    
    .action-grid {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===========================
   Language Selector Styles
   =========================== */

.setting-label {
    display: block;
    font-size: 0.95rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.language-selector {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.5)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    background-size: 20px;
    padding-right: calc(var(--spacing-sm) * 3);
}

.language-selector:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-accent-blue);
}

.language-selector:focus {
    outline: none;
    border-color: var(--color-accent-blue);
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}

.setting-item {
    margin-bottom: var(--spacing-md);
}

.setting-item:last-child {
    margin-bottom: 0;
}

/* Mobile adjustments */
@media (max-width: 640px) {
    .language-selector {
        font-size: 0.95rem;
    }
}