* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --ios-blue: #007AFF;
    --ios-green: #34C759;
    --ios-red: #FF3B30;
    --ios-orange: #FF9500;
    --ios-gray: #8E8E93;
    --ios-gray-light: #F2F2F7;
    --ios-gray-dark: #1C1C1E;
    --ios-separator: rgba(60, 60, 67, 0.12);
    --safe-area-top: env(safe-area-inset-top, 20px);
    --safe-area-bottom: env(safe-area-inset-bottom, 20px);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--ios-gray-light);
    min-height: 100vh;
    min-height: -webkit-fill-available;
    color: #1C1C1E;
    font-size: 17px;
    line-height: 1.4;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    display: flex;
    flex-direction: column;
    background: var(--ios-gray-light);
}

header {
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    padding: 16px 20px;
    padding-top: calc(var(--safe-area-top) + 10px);
    text-align: center;
    border-bottom: 0.5px solid var(--ios-separator);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 17px;
    font-weight: 600;
    color: #1C1C1E;
    letter-spacing: -0.4px;
}

.subtitle {
    font-size: 13px;
    color: var(--ios-gray);
    margin-top: 2px;
    font-weight: 400;
}

main {
    flex: 1;
    padding: 16px;
    padding-bottom: calc(var(--safe-area-bottom) + 16px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* Text boxes - iOS card style */
.text-box {
    background: white;
    border-radius: 12px;
    padding: 14px 16px;
    margin-bottom: 12px;
    position: relative;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.text-box label {
    font-size: 13px;
    font-weight: 500;
    color: var(--ios-gray);
    display: block;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.text-content {
    min-height: 60px;
    font-size: 17px;
    line-height: 1.5;
    color: #1C1C1E;
    word-break: break-word;
}

.has-placeholder {
    color: #C7C7CC;
}

/* Pinyin styling */
.translation-text {
    display: block;
    font-size: 17px;
    line-height: 1.5;
    color: #1C1C1E;
}

.pinyin-text {
    display: block;
    font-size: 14px;
    color: var(--ios-blue);
    margin-top: 6px;
    font-style: italic;
    letter-spacing: 0.5px;
}

.target-box {
    background: linear-gradient(135deg, #E8F5E9 0%, #F1F8E9 100%);
    padding-right: 50px;
}

.speak-btn {
    position: absolute;
    right: 12px;
    bottom: 12px;
    background: var(--ios-blue);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

.speak-btn:active {
    transform: scale(0.92);
    opacity: 0.8;
}

/* Arrow */
.arrow {
    text-align: center;
    padding: 8px 0;
}

.arrow-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--ios-blue);
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
}

/* Mode sections */
.mode-section {
    margin-bottom: 16px;
}

.section-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--ios-gray);
    margin-bottom: 8px;
    margin-left: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Auto mode buttons */
.auto-mode-container {
    display: flex;
    flex-direction: row;
    gap: 10px;
}

.mode-btn {
    flex: 1;
    padding: 14px 10px;
    border: none;
    background: white;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s, background 0.15s;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.mode-btn:active {
    transform: scale(0.96);
    background: #E5E5EA;
}

.mode-btn.active {
    background: #E3F2FD;
}

.mode-btn.active.listening {
    background: #FFF3E0;
    animation: ios-pulse 2s infinite;
}

@keyframes ios-pulse {
    0%, 100% { background: #FFF3E0; }
    50% { background: #FFE0B2; }
}

.mode-icon {
    font-size: 28px;
    line-height: 1;
}

.mode-text {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.mode-title {
    font-size: 15px;
    font-weight: 500;
    color: #1C1C1E;
}

.mode-subtitle {
    font-size: 12px;
    color: var(--ios-gray);
    margin-top: 2px;
}

.mode-status {
    font-size: 12px;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 12px;
    background: #E5E5EA;
    color: var(--ios-gray);
}

.mode-btn.active .mode-status {
    background: var(--ios-green);
    color: white;
}

/* Manual mode buttons */
.manual-mode-container {
    display: flex;
    flex-direction: row;
    gap: 10px;
}

.record-btn {
    flex: 1;
    padding: 16px 12px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.record-btn:active {
    transform: scale(0.96);
}

.btn-vn {
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E8E 100%);
    color: white;
}

.btn-cn {
    background: linear-gradient(135deg, #FFD93D 0%, #FFE066 100%);
    color: #1C1C1E;
}

.record-btn.recording {
    animation: recording-pulse 1s infinite;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

@keyframes recording-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

.record-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-cn .record-icon {
    background: rgba(0, 0, 0, 0.1);
}

.record-text {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.record-title {
    font-size: 15px;
    font-weight: 600;
}

.record-subtitle {
    font-size: 12px;
    opacity: 0.8;
    margin-top: 2px;
}

.record-flag {
    font-size: 20px;
}

/* Status bar - iOS style */
.status {
    text-align: center;
    margin-top: 12px;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 500;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.status:empty {
    display: none;
}

.status.listening {
    background: #FFF8E1;
    color: #F57C00;
}

.status.translating {
    background: #E3F2FD;
    color: #1976D2;
}

.status.error {
    background: #FFEBEE;
    color: #D32F2F;
}

.status.success {
    background: #E8F5E9;
    color: #388E3C;
}

.status.speaking {
    background: linear-gradient(135deg, #E8EAF6 0%, #C5CAE9 100%);
    color: #3F51B5;
    animation: speaking-pulse 1s infinite;
}

@keyframes speaking-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Footer */
footer {
    text-align: center;
    padding: 12px 16px;
    padding-bottom: calc(var(--safe-area-bottom) + 12px);
    color: var(--ios-gray);
    font-size: 12px;
    background: white;
    border-top: 0.5px solid var(--ios-separator);
}

/* Mobile optimizations */
@media screen and (max-width: 500px) {
    .container {
        max-width: 100%;
    }
    
    header {
        padding: 12px 16px;
        padding-top: calc(var(--safe-area-top) + 8px);
    }
    
    main {
        padding: 12px;
    }
    
    .text-box {
        padding: 12px 14px;
        margin-bottom: 10px;
    }
    
    .text-content {
        min-height: 50px;
        font-size: 16px;
    }
    
    .mode-btn {
        padding: 12px 8px;
    }
    
    .mode-icon {
        font-size: 24px;
    }
    
    .mode-title {
        font-size: 14px;
    }
    
    .mode-subtitle {
        font-size: 11px;
    }
    
    .mode-status {
        font-size: 11px;
        padding: 3px 8px;
    }
    
    .record-btn {
        padding: 12px 8px;
    }
    
    .record-icon {
        width: 42px;
        height: 42px;
    }
    
    .record-title {
        font-size: 14px;
    }
    
    .record-subtitle {
        font-size: 11px;
    }
    
    .record-flag {
        font-size: 18px;
    }
}

/* Small phones */
@media screen and (max-width: 375px) {
    header h1 {
        font-size: 16px;
    }
    
    .text-content {
        font-size: 15px;
    }
    
    .mode-title {
        font-size: 15px;
    }
    
    .record-btn {
        padding: 10px 6px;
    }
    
    .record-icon {
        width: 38px;
        height: 38px;
    }
    
    .record-icon svg {
        width: 20px;
        height: 20px;
    }
    
    .record-title {
        font-size: 13px;
    }
    
    .record-subtitle {
        font-size: 10px;
    }
    
    .record-flag {
        font-size: 16px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --ios-gray-light: #000000;
        --ios-separator: rgba(84, 84, 88, 0.65);
    }
    
    body {
        background: #000000;
        color: #FFFFFF;
    }
    
    .container {
        background: #000000;
    }
    
    header {
        background: rgba(28, 28, 30, 0.72);
        border-bottom-color: var(--ios-separator);
    }
    
    header h1 {
        color: #FFFFFF;
    }
    
    .text-box {
        background: #1C1C1E;
    }
    
    .text-content {
        color: #FFFFFF;
    }
    
    .has-placeholder {
        color: #636366;
    }
    
    .target-box {
        background: linear-gradient(135deg, #1C3D1F 0%, #1C2D1E 100%);
    }
    
    .auto-mode-container {
        background: transparent;
    }
    
    .mode-btn {
        background: #1C1C1E;
    }
    
    .mode-btn:active {
        background: #2C2C2E;
    }
    
    .mode-btn.active {
        background: #1A2A3A;
    }
    
    .mode-title {
        color: #FFFFFF;
    }
    
    .mode-status {
        background: #3A3A3C;
        color: #EBEBF5;
    }
    
    footer {
        background: #1C1C1E;
        border-top-color: var(--ios-separator);
    }
    
    .status.listening {
        background: #3D3000;
        color: #FFB74D;
    }
    
    .status.translating {
        background: #0D2B4A;
        color: #64B5F6;
    }
    
    .status.error {
        background: #4A1515;
        color: #EF9A9A;
    }
    
    .status.success {
        background: #1B3D1B;
        color: #81C784;
    }
    
    .status.speaking {
        background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
        color: #9FA8DA;
    }
}

/* Prevent zoom on input focus for iOS */
@supports (-webkit-touch-callout: none) {
    select, input, textarea {
        font-size: 16px !important;
    }
}