/* iOS Design Variables */
:root {
    /* Colors - iOS Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f2f2f7;
    --bg-tertiary: #ffffff;
    --bg-grouped: #f2f2f7;
    --bg-system: #ffffff;
    
    --text-primary: #000000;
    --text-secondary: #3c3c43;
    --text-tertiary: #3c3c4399;
    --text-quaternary: #3c3c434d;
    
    --accent-blue: #007aff;
    --accent-blue-hover: #0056cc;
    --accent-green: #34c759;
    --accent-orange: #ff9500;
    --accent-red: #ff3b30;
    --accent-purple: #af52de;
    
    --border-color: #3c3c434a;
    --separator-color: #3c3c434a;
    --fill-primary: #787880;
    --fill-secondary: #78788033;
    --fill-tertiary: #7878801f;
    --fill-quaternary: #78788014;
    
    /* Shadows */
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* Border Radius */
    --radius-small: 6px;
    --radius-medium: 10px;
    --radius-large: 16px;
    --radius-xlarge: 20px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Typography */
    --font-system: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', system-ui, sans-serif;
    --font-mono: 'SF Mono', 'JetBrains Mono', 'Menlo', 'Monaco', 'Cascadia Code', monospace;
    
    /* iOS specific measurements */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --header-height: 44px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #1c1c1e;
    --bg-tertiary: #2c2c2e;
    --bg-grouped: #000000;
    --bg-system: #1c1c1e;
    
    --text-primary: #ffffff;
    --text-secondary: #ebebf5;
    --text-tertiary: #ebebf599;
    --text-quaternary: #ebebf54d;
    
    --accent-blue: #0a84ff;
    --accent-blue-hover: #409cff;
    --accent-green: #30d158;
    --accent-orange: #ff9f0a;
    --accent-red: #ff453a;
    --accent-purple: #bf5af2;
    
    --border-color: #38383a;
    --separator-color: #38383a;
    --fill-primary: #7c7c80;
    --fill-secondary: #7c7c8033;
    --fill-tertiary: #7c7c801f;
    --fill-quaternary: #7c7c8014;
    
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.6);
}

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

html {
    height: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-system);
    background-color: var(--bg-grouped);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: var(--safe-area-top);
    padding-bottom: var(--safe-area-bottom);
}

/* Header - iOS Style */
.header {
    background-color: var(--bg-primary);
    border-bottom: 0.5px solid var(--separator-color);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-md);
    max-width: 430px;
    margin: 0 auto;
}

.header-left {
    flex: 1;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 20px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border-radius: var(--radius-small);
    color: white;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    flex: 0 0 auto;
}

.theme-btn {
    width: 32px;
    height: 32px;
    border-radius: 16px;
    border: none;
    background-color: var(--fill-tertiary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.theme-btn:hover {
    background-color: var(--fill-secondary);
    transform: scale(1.05);
}

.theme-btn:active {
    transform: scale(0.95);
}

/* Main Content */
.main {
    flex: 1;
    padding: var(--spacing-md);
    max-width: 430px;
    margin: 0 auto;
    width: 100%;
}

.container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Status Card */
.status-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-large);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-light);
    border: 0.5px solid var(--separator-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--fill-primary);
    transition: background-color 0.3s ease;
}

.status-dot.connected {
    background-color: var(--accent-green);
    box-shadow: 0 0 8px var(--accent-green);
}

.status-dot.error {
    background-color: var(--accent-red);
    box-shadow: 0 0 8px var(--accent-red);
}

.status-text {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
}

.connect-btn {
    background-color: var(--accent-blue);
    color: white;
    border: none;
    border-radius: var(--radius-medium);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.connect-btn:hover {
    background-color: var(--accent-blue-hover);
    transform: translateY(-1px);
}

.connect-btn:active {
    transform: translateY(0) scale(0.98);
}

/* Cards */
.card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    border: 0.5px solid var(--separator-color);
}

.card-header {
    padding: var(--spacing-md) var(--spacing-md) 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-badge {
    background-color: var(--fill-tertiary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-small);
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-content {
    padding: var(--spacing-md);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--separator-color);
    border-radius: var(--radius-medium);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 16px;
    transition: all 0.2s ease;
    -webkit-appearance: none;
    appearance: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    background-color: var(--bg-primary);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.form-textarea {
    resize: vertical;
    font-family: var(--font-mono);
    min-height: 100px;
}

.input-container {
    position: relative;
    display: flex;
    align-items: center;
}

.input-action-btn {
    position: absolute;
    right: var(--spacing-sm);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-small);
    transition: all 0.2s ease;
}

.input-action-btn:hover {
    background-color: var(--fill-tertiary);
}

/* Segmented Control - iOS Style */
.segmented-control {
    display: flex;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-medium);
    padding: 2px;
    position: relative;
}

.segmented-control input[type="radio"] {
    display: none;
}

.segment-label {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: calc(var(--radius-medium) - 2px);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 1;
    position: relative;
}

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

.segmented-control input[type="radio"]:checked + .segment-label {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-light);
}

/* Sliders */
.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.form-slider {
    flex: 1;
    height: 4px;
    border-radius: 2px;
    background-color: var(--fill-tertiary);
    outline: none;
    appearance: none;
    -webkit-appearance: none;
}

.form-slider::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: white;
    border: 2px solid var(--accent-blue);
    cursor: pointer;
    box-shadow: var(--shadow-light);
    transition: all 0.2s ease;
}

.form-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.form-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: white;
    border: 2px solid var(--accent-blue);
    cursor: pointer;
    box-shadow: var(--shadow-light);
}

.form-input-small {
    width: 80px;
    padding: var(--spacing-sm);
    text-align: center;
}

/* Size Options */
.size-options {
    display: flex;
    gap: var(--spacing-sm);
}

.size-options input[type="radio"] {
    display: none;
}

.size-option {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border: 1px solid var(--separator-color);
    border-radius: var(--radius-medium);
    background-color: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.size-option:hover {
    border-color: var(--accent-blue);
    background-color: var(--bg-primary);
}

.size-options input[type="radio"]:checked + .size-option {
    border-color: var(--accent-blue);
    background-color: var(--accent-blue);
    color: white;
}

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

.size-desc {
    font-size: 12px;
    opacity: 0.7;
}

/* Form Row */
.form-row {
    display: flex;
    gap: var(--spacing-md);
}

.form-row .form-group {
    flex: 1;
}

/* Textarea Container */
.textarea-container {
    position: relative;
}

.textarea-footer {
    display: flex;
    justify-content: flex-end;
    padding-top: var(--spacing-xs);
}

.char-count {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* Buttons */
.btn-primary, .btn-secondary, .action-btn {
    border: none;
    border-radius: var(--radius-medium);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--separator-color);
    padding: var(--spacing-md) var(--spacing-lg);
}

.btn-secondary:hover {
    background-color: var(--fill-tertiary);
}

.action-btn {
    background-color: var(--fill-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 14px;
    min-height: 36px;
}

.action-btn:hover {
    background-color: var(--fill-secondary);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.action-buttons .btn-primary,
.action-buttons .btn-secondary {
    flex: 1;
}

.response-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Loading State */
.loading-state {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xxl);
    color: var(--text-secondary);
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--fill-tertiary);
    border-top: 2px solid var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: 16px;
    font-weight: 500;
}

/* Response */
.response-container {
    min-height: 100px;
}

.response-text {
    background-color: var(--bg-secondary);
    border: 1px solid var(--separator-color);
    border-radius: var(--radius-medium);
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 13px;
    white-space: pre-wrap;
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
    color: var(--text-primary);
}

/* Image Response */
.image-response {
    text-align: center;
}

.image-container {
    position: relative;
    border-radius: var(--radius-large);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    background-color: var(--bg-secondary);
    display: inline-block;
    max-width: 100%;
}

.generated-image {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-large);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: var(--spacing-md);
}

.image-container:hover .image-overlay {
    opacity: 1;
}

.image-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.image-action-btn {
    width: 40px;
    height: 40px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.image-action-btn:hover {
    background: white;
    transform: scale(1.05);
}

.image-info {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-tertiary);
    padding: 0 var(--spacing-sm);
}

/* Fullscreen Modal */
.fullscreen-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.modal-close {
    position: absolute;
    top: -50px;
    right: 0;
    width: 40px;
    height: 40px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.fullscreen-image {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-large);
}

/* Footer */
.footer {
    background-color: var(--bg-primary);
    border-top: 0.5px solid var(--separator-color);
    padding: var(--spacing-md);
    text-align: center;
}

.footer-text {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1100;
    pointer-events: none;
}

.toast {
    background-color: var(--bg-primary);
    border: 0.5px solid var(--separator-color);
    border-radius: var(--radius-large);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-medium);
    backdrop-filter: blur(20px);
    animation: slideIn 0.3s ease;
    pointer-events: auto;
    font-size: 15px;
    font-weight: 500;
}

.toast.success {
    border-left: 4px solid var(--accent-green);
}

.toast.error {
    border-left: 4px solid var(--accent-red);
}

.toast.warning {
    border-left: 4px solid var(--accent-orange);
}

@keyframes slideIn {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* JSON Syntax Highlighting */
.json-key { color: var(--accent-purple); }
.json-string { color: var(--accent-blue); }
.json-number { color: var(--accent-orange); }
.json-boolean { color: var(--accent-red); }
.json-null { color: var(--text-tertiary); }

/* Mobile Optimizations */
@media (max-width: 480px) {
    .main {
        padding: var(--spacing-sm);
    }
    
    .form-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .size-options {
        flex-direction: column;
    }
    
    .slider-container {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }
    
    .form-input-small {
        width: 100%;
    }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --separator-color: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --separator-color: #ffffff;
    }
}