/* =========================================
   Plain English, Please - Design System
   A calm, accessible CSS foundation
   ========================================= */

/* =========================================
   CSS Variables / Design Tokens
   ========================================= */
:root {
    /* Colors - Calm, neutral palette */
    --color-bg-primary: #f8f9fa;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #e9ecef;
    --color-bg-card: #ffffff;
    
    --color-text-primary: #2d3748;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    --color-text-inverse: #ffffff;
    
    --color-accent: #5a7894;
    --color-accent-hover: #4a6578;
    --color-accent-soft: #e8eff5;
    
    --color-success: #48bb78;
    --color-warning: #ed8936;
    --color-error: #e53e3e;
    
    --color-border: #e2e8f0;
    --color-border-focus: #5a7894;
    
    /* Warm variation colors for response cards */
    --color-card-short: #f0f7ff;
    --color-card-neutral: #f5f5f5;
    --color-card-warm: #fff8f0;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --line-height-tight: 1.25;
    --line-height-normal: 1.6;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    
    /* Min touch target */
    --min-touch-target: 48px;
}

/* High Contrast Mode */
[data-theme="high-contrast"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f0f0f0;
    --color-bg-card: #ffffff;
    
    --color-text-primary: #000000;
    --color-text-secondary: #1a1a1a;
    --color-text-muted: #333333;
    
    --color-accent: #0055cc;
    --color-accent-hover: #003d99;
    --color-accent-soft: #e6f0ff;
    
    --color-border: #000000;
    --color-border-focus: #0055cc;
    
    --shadow-sm: 0 0 0 1px #000000;
    --shadow-md: 0 0 0 2px #000000;
}

/* =========================================
   Reset & Base Styles
   ========================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =========================================
   Typography
   ========================================= */
h1, h2, h3, h4 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-sm);
}

h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-md);
}

h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
}

p {
    margin-bottom: var(--space-md);
}

.text-muted {
    color: var(--color-text-muted);
}

.text-secondary {
    color: var(--color-text-secondary);
}

/* =========================================
   Layout
   ========================================= */
.container {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    padding: var(--space-lg);
}

.screen {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================================
   Header
   ========================================= */
.app-header {
    text-align: center;
    padding: var(--space-xl) 0 var(--space-lg);
}

.app-title {
    font-size: var(--font-size-2xl);
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.app-tagline {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    font-weight: var(--font-weight-normal);
}

/* =========================================
   Form Elements
   ========================================= */
.form-section {
    margin-bottom: var(--space-xl);
}

.form-label {
    display: block;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.form-helper {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.textarea-wrapper {
    position: relative;
}

textarea {
    width: 100%;
    min-height: 180px;
    padding: var(--space-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    resize: vertical;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

textarea:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}

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

/* =========================================
   Buttons
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    gap: var(--space-sm);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

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

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

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

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

.btn-ghost:hover:not(:disabled) {
    background-color: var(--color-bg-tertiary);
}

.btn-full {
    width: 100%;
}

.btn-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn-group-vertical {
    flex-direction: column;
}

/* =========================================
   Selection Buttons (Intent & Context)
   ========================================= */
.selection-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.selection-btn {
    min-height: var(--min-touch-target);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.selection-btn:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-text-muted);
}

.selection-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.selection-btn.selected {
    color: var(--color-accent);
    background-color: var(--color-accent-soft);
    border-color: var(--color-accent);
}

/* =========================================
   Response Cards
   ========================================= */
.response-cards {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.response-card {
    background-color: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast);
}

.response-card:hover {
    box-shadow: var(--shadow-md);
}

.response-card--short {
    background-color: var(--color-card-short);
    border-color: #c3d9f0;
}

.response-card--neutral {
    background-color: var(--color-card-neutral);
    border-color: #d4d4d4;
}

.response-card--warm {
    background-color: var(--color-card-warm);
    border-color: #f0d9c3;
}

.response-card__label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.response-card__text {
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.response-card__clarifier {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-sm);
    display: none;
}

.response-card__clarifier.visible {
    display: block;
}

.response-card__actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.response-card__actions .btn {
    min-height: 40px;
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
}

/* =========================================
   Toggle Switch
   ========================================= */
.toggle-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
}

.toggle {
    position: relative;
    width: 52px;
    height: 28px;
    flex-shrink: 0;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle__slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-fast);
}

.toggle__slider::before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: transform var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.toggle input:checked + .toggle__slider {
    background-color: var(--color-accent);
}

.toggle input:checked + .toggle__slider::before {
    transform: translateX(24px);
}

.toggle input:focus + .toggle__slider {
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.toggle__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* =========================================
   Saved Responses List
   ========================================= */
.saved-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.saved-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.saved-item__text {
    flex: 1;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
}

.saved-item__actions {
    display: flex;
    gap: var(--space-xs);
    flex-shrink: 0;
}

.saved-item__actions .btn {
    min-height: 36px;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-sm);
}

.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-muted);
}

/* =========================================
   Modal
   ========================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 420px;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal__title {
    font-size: var(--font-size-xl);
    text-align: center;
    margin-bottom: var(--space-md);
}

.modal__text {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.modal__actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* =========================================
   Privacy Notice
   ========================================= */
.privacy-notice {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md);
    background-color: var(--color-accent-soft);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.privacy-notice__icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

/* =========================================
   Usage Counter
   ========================================= */
.usage-counter {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-md);
}

.usage-counter--warning {
    color: var(--color-warning);
}

/* =========================================
   Settings Bar
   ========================================= */
.settings-bar {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    margin-bottom: var(--space-md);
}

.settings-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.settings-btn:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.settings-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}

/* =========================================
   Toast Notifications
   ========================================= */
.toast {
    position: fixed;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* =========================================
   Utility Classes
   ========================================= */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

/* =========================================
   Footer Links
   ========================================= */
.footer-links {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.footer-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-accent);
}

/* =========================================
   Pro Badge
   ========================================= */
.pro-badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    background-color: var(--color-accent-soft);
    border-radius: var(--radius-full);
    margin-left: var(--space-sm);
}

.pro-feature-locked {
    opacity: 0.5;
    pointer-events: none;
}

/* =========================================
   Responsive Adjustments
   ========================================= */
@media (max-width: 480px) {
    :root {
        --font-size-base: 1rem;
        --font-size-lg: 1.125rem;
        --font-size-xl: 1.25rem;
        --font-size-2xl: 1.5rem;
    }
    
    .container {
        padding: var(--space-md);
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .response-card__actions {
        flex-wrap: wrap;
    }
}