:root {
    /* Apple Design System Colors */
    --ios-color-primary: #007AFF;
    --ios-color-primary-dark: #0056b3;
    --ios-color-success: #34C759;
    --ios-color-danger: #FF3B30;
    --ios-color-warning: #FF9500;
    
    --ios-color-background: #F5F5F7;
    --ios-color-surface: #FFFFFF;
    --ios-color-surface-secondary: #E5E5EA; /* For inputs/chips */
    
    --ios-color-text-primary: #1D1D1F;
    --ios-color-text-secondary: #86868B;
    
    --ios-color-border: #D2D2D7;
    --ios-color-separator: #C6C6C8;
    
    --ios-shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
    --ios-shadow-dropdown: 0 4px 16px rgba(0, 0, 0, 0.12);
    
    --ios-radius-card: 18px;
    --ios-radius-input: 10px;
    --ios-radius-button: 980px; /* Pill shape */
    
    --ios-font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Mapping old MD vars to new system to maintain compatibility with minimal JS changes */
    --md-sys-color-primary: var(--ios-color-primary);
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-surface: var(--ios-color-surface);
    --md-sys-color-on-surface: var(--ios-color-text-primary);
    --md-sys-color-on-surface-variant: var(--ios-color-text-secondary);
    --md-sys-color-outline: var(--ios-color-border);
    --md-sys-color-outline-variant: var(--ios-color-separator);
    --md-sys-color-error: var(--ios-color-danger);
}

[data-theme="dark"] {
    --ios-color-background: #000000;
    --ios-color-surface: #1C1C1E;
    --ios-color-surface-secondary: #2C2C2E;
    
    --ios-color-text-primary: #FFFFFF;
    --ios-color-text-secondary: #98989D;
    
    --ios-color-border: #38383A;
    --ios-color-separator: #38383A;
    
    --ios-shadow-card: 0 2px 12px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: var(--ios-font-family);
    background-color: var(--ios-color-background);
    color: var(--ios-color-text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.app-bar {
    background-color: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.1);
    color: var(--ios-color-text-primary);
    padding: 0 24px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1000;
}

[data-theme="dark"] .app-bar {
    background-color: rgba(28, 28, 30, 0.72);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.app-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -0.022em;
}

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

.main-container {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 24px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.left-panel, .right-panel {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Mobile Layout */
@media (max-width: 900px) {
    .main-container {
        grid-template-columns: 1fr;
        padding: 16px;
    }
}

/* Apple Card */
.md-card {
    background-color: var(--ios-color-surface);
    border-radius: var(--ios-radius-card);
    padding: 24px;
    box-shadow: var(--ios-shadow-card);
    border: 1px solid rgba(0,0,0,0.05); /* Very subtle border */
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

[data-theme="dark"] .md-card {
    border: 1px solid rgba(255,255,255,0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.card-title {
    font-size: 20px;
    color: var(--ios-color-text-primary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.01em;
}

/* Form Grid */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px 24px;
}

.full-width {
    grid-column: 1 / -1;
}

/* iOS Inputs */
.md-text-field {
    position: relative;
    margin-bottom: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.md-text-field label {
    font-size: 13px;
    color: var(--ios-color-text-secondary);
    font-weight: 500;
    margin-left: 2px;
    position: static; /* Remove floating logic visually, keep structure */
    pointer-events: none;
    order: -1; /* Move label above input */
}

.md-text-field input,
.md-text-field select,
.md-text-field textarea {
    background: var(--ios-color-surface);
    border: 1px solid var(--ios-color-border);
    border-radius: var(--ios-radius-input);
    padding: 10px 12px;
    font-size: 15px;
    color: var(--ios-color-text-primary);
    outline: none;
    transition: all 0.2s;
    height: 40px; /* Smaller height than MD */
    width: 100%;
    font-family: inherit;
    appearance: none;
    -webkit-appearance: none;
}

[data-theme="dark"] .md-text-field input,
[data-theme="dark"] .md-text-field select,
[data-theme="dark"] .md-text-field textarea {
    background: var(--ios-color-surface-secondary);
    border-color: transparent;
}

.md-text-field textarea {
    height: auto;
    min-height: 120px;
    padding: 12px;
    line-height: 1.4;
}

.md-text-field input:focus,
.md-text-field select:focus,
.md-text-field textarea:focus {
    border-color: var(--ios-color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

/* Hide the floating label classes effects */
.md-text-field.focused label,
.md-text-field.has-value label {
    /* Reset to default static position style */
    top: auto;
    left: auto;
    font-size: 13px;
    color: var(--ios-color-text-secondary);
}

.input-group {
    display: flex;
    gap: 12px;
}

/* iOS Button */
.md-btn {
    position: relative;
    overflow: hidden;
    height: 36px;
    padding: 0 16px;
    border-radius: var(--ios-radius-button);
    border: none;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all 0.2s;
    text-decoration: none;
}

.md-btn:active {
    transform: scale(0.96);
    opacity: 0.9;
}

.md-btn.filled {
    background-color: var(--ios-color-primary);
    color: white;
}

.md-btn.filled:hover {
    background-color: var(--ios-color-primary-dark);
    box-shadow: none;
}

.md-btn.tonal {
    background-color: var(--ios-color-surface-secondary);
    color: var(--ios-color-primary);
}

.md-btn.tonal:hover {
    background-color: rgba(0, 122, 255, 0.15);
}

.md-btn.outlined {
    background-color: transparent;
    border: 1px solid var(--ios-color-primary);
    color: var(--ios-color-primary);
}

.md-btn.icon-only {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: 50%;
    color: var(--ios-color-text-primary);
    background: transparent;
}

.md-btn.icon-only:hover {
    background-color: var(--ios-color-surface-secondary);
}

/* iOS Switch */
.md-switch-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 0;
}

.md-switch {
    position: relative;
    display: inline-block;
    width: 51px;
    height: 31px;
}

.md-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #E9E9EA;
    transition: .4s;
    border-radius: 31px;
}

[data-theme="dark"] .slider {
    background-color: #39393D;
}

.slider:before {
    position: absolute;
    content: "";
    height: 27px;
    width: 27px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    box-shadow: 0 3px 8px rgba(0,0,0,0.15), 0 3px 1px rgba(0,0,0,0.06);
}

input:checked + .slider {
    background-color: var(--ios-color-success);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

/* Chips */
.tags-input-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 40px;
    border: 1px solid var(--ios-color-border);
    border-radius: var(--ios-radius-input);
    padding: 6px;
    align-items: center;
    background: var(--ios-color-surface);
}

[data-theme="dark"] .tags-input-container {
    background: var(--ios-color-surface-secondary);
    border-color: transparent;
}

.md-chip {
    display: inline-flex;
    align-items: center;
    height: 28px;
    padding: 0 10px;
    border-radius: 6px;
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--ios-color-primary);
    font-size: 13px;
    gap: 6px;
    cursor: default;
    font-weight: 500;
}

.md-chip i {
    font-size: 14px;
    cursor: pointer;
    opacity: 0.7;
}

.md-chip i:hover {
    opacity: 1;
}

.tag-input {
    border: none;
    outline: none;
    background: transparent;
    color: var(--ios-color-text-primary);
    flex: 1;
    min-width: 100px;
    font-size: 14px;
}

/* Code Panel */
.code-textarea {
    width: 100%;
    height: 400px;
    background-color: var(--ios-color-surface-secondary);
    color: var(--ios-color-text-primary);
    border: none;
    border-radius: 12px;
    padding: 16px;
    font-family: 'SF Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    resize: none;
    outline: none;
    line-height: 1.5;
}

/* Toast */
.md-snackbar {
    visibility: hidden;
    min-width: 250px;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--ios-color-text-primary);
    text-align: center;
    border-radius: 24px;
    padding: 12px 24px;
    position: fixed;
    z-index: 1000;
    left: 50%;
    top: 80px; /* Top toast in iOS style */
    bottom: auto;
    transform: translateX(-50%);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    opacity: 0;
    transition: opacity 0.3s, top 0.3s;
    font-weight: 500;
    font-size: 14px;
}

[data-theme="dark"] .md-snackbar {
    background-color: rgba(28, 28, 30, 0.8);
}

.md-snackbar.show {
    visibility: visible;
    opacity: 1;
    top: 100px;
}

/* Modal */
.md-dialog-overlay {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
}

.md-dialog-overlay.show {
    display: flex;
}

.md-dialog {
    background-color: var(--ios-color-surface);
    border-radius: 20px;
    padding: 24px;
    width: 80%;
    max-width: 320px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    gap: 16px;
    text-align: center;
}

.dialog-icon {
    font-size: 32px;
    color: var(--ios-color-warning);
    margin: 0 auto;
}

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

.dialog-content {
    color: var(--ios-color-text-secondary);
    font-size: 14px;
    line-height: 1.4;
}

.dialog-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 8px;
}

.dialog-actions button {
    flex: 1;
}

/* Helpers */
.hidden { display: none !important; }
.disabled-section { 
    opacity: 0.5; 
    pointer-events: none; 
}

.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    font-size: 20px;
    vertical-align: middle;
}

footer {
    text-align: center;
    padding: 32px;
    color: var(--ios-color-text-secondary);
    font-size: 12px;
    margin-top: auto;
}

footer a {
    color: var(--ios-color-primary);
    text-decoration: none;
}

/* New Segmented Control Nav */
.nav-segmented {
    background-color: rgba(118, 118, 128, 0.12);
    border-radius: 9px;
    padding: 2px;
    display: inline-flex;
    position: relative;
    height: 32px;
}

.nav-item {
    position: relative;
    z-index: 1;
    padding: 0 12px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 500;
    color: var(--ios-color-text-primary);
    text-decoration: none;
    border-radius: 7px;
    transition: all 0.2s ease;
    min-width: 60px;
    cursor: pointer;
}

.nav-item.active {
    background-color: var(--ios-color-surface);
    box-shadow: 0 3px 8px rgba(0,0,0,0.12), 0 3px 1px rgba(0,0,0,0.04);
    font-weight: 600;
}

[data-theme="dark"] .nav-item.active {
    background-color: #636366;
    color: white;
}