/* ==========================================================================
   Questionnaire App - Global Styles
   ========================================================================== */

/* CSS Custom Properties */
:root {
    /* Colors - Calm, soothing palette */
    --color-primary: #667eea;
    --color-primary-dark: #5a6fd6;
    --color-secondary: #764ba2;
    --color-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Neutral colors */
    --color-bg: #f5f5f7;
    --color-white: #ffffff;
    --color-text-primary: #2C3E50;
    --color-text-secondary: #7F8C8D;
    --color-text-muted: #95a5a6;
    --color-border: #e0e0e0;
    --color-border-light: #f0f0f0;
    
    /* Feedback colors */
    --color-success: #27AE60;
    --color-error: #E74C3C;
    --color-error-bg: #fef2f2;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 40px;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--color-gradient);
    min-height: 100vh;
    color: var(--color-text-primary);
    line-height: 1.6;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
}

.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg) 0;
}

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    z-index: 100;
}

.lang-dropdown {
    position: relative;
}

.lang-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border: 2px solid rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.lang-dropdown-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

.lang-dropdown.open .lang-dropdown-toggle {
    background: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-white);
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.lang-flag {
    font-size: 18px;
    line-height: 1;
}

.lang-code {
    font-weight: 700;
}

.lang-arrow {
    transition: transform var(--transition-base);
}

.lang-dropdown.open .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 160px;
    background: var(--color-white);
    border: 2px solid var(--color-white);
    border-top: none;
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    overflow: hidden;
}

.lang-dropdown.open .lang-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: background var(--transition-fast);
}

.lang-dropdown-item:hover {
    background: var(--color-bg);
}

.lang-dropdown-item.active {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--color-primary);
}

.lang-name {
    flex: 1;
}

.lang-check {
    color: var(--color-primary);
}

/* Footer */
.app-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    padding: var(--space-lg) 0;
    color: rgba(255, 255, 255, 0.9);
}

.footer-logo {
    height: 40px;
    width: auto;
}

.footer-text {
    font-size: var(--font-size-sm);
}

.footer-text strong {
    font-weight: 700;
    display: block;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.welcome-card,
.question-card,
.email-card,
.loading-card,
.letter-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2xl);
    width: 100%;
    max-width: 560px;
    margin: 0 auto;
}

/* ==========================================================================
   Welcome Page
   ========================================================================== */

.welcome-container {
    width: 100%;
    padding: var(--space-md);
}

.welcome-icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.welcome-icon svg {
    color: var(--color-primary);
}

.welcome-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.welcome-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.welcome-benefits {
    margin-bottom: var(--space-xl);
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-base);
}

.benefit-icon {
    color: var(--color-success);
    flex-shrink: 0;
}

.welcome-note {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-lg);
}

/* ==========================================================================
   Progress Bar
   ========================================================================== */

.progress-wrapper {
    margin-bottom: var(--space-xl);
    width: 100%;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.progress-fill {
    height: 100%;
    background: var(--color-white);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-text {
    text-align: center;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.9);
    margin-top: var(--space-sm);
    font-weight: 500;
}

/* ==========================================================================
   Question Page
   ========================================================================== */

.question-container {
    width: 100%;
    padding: var(--space-md);
}

.question-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
    line-height: 1.4;
}

.question-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

/* Radio Options */
.options-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.option-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.option-item:hover {
    background: #f0f0f5;
    border-color: var(--color-border);
}

.option-item.selected {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-color: var(--color-primary);
}

.option-item input[type="radio"],
.option-item input[type="checkbox"] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Checkbox variant */
.option-indicator--checkbox {
    border-radius: 4px;
}

.option-item--checkbox.selected .option-indicator--checkbox::after {
    width: 5px;
    height: 9px;
    background: transparent;
    border-radius: 0;
    border-right: 2px solid white;
    border-bottom: 2px solid white;
    transform: translate(-50%, -65%) rotate(45deg);
}

.option-indicator {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    transition: all var(--transition-base);
}

.option-item.selected .option-indicator {
    border-color: var(--color-primary);
    background: var(--color-primary);
}

.option-item.selected .option-indicator::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

.option-text {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
}

/* Select Input */
.select-wrapper {
    position: relative;
    margin-bottom: var(--space-xl);
}

.select-input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    padding-right: var(--space-2xl);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-text-primary);
    cursor: pointer;
    appearance: none;
    transition: border-color var(--transition-base);
}

.select-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.select-icon {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
    pointer-events: none;
}

/* Text Input */
.text-input-wrapper {
    margin-bottom: var(--space-xl);
}

.text-input {
    width: 100%;
    padding: var(--space-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    resize: vertical;
    min-height: 120px;
    transition: border-color var(--transition-base);
}

.text-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

/* ─── Custom Time Picker (reuses .dp-wrapper / .dp-trigger / .dp-panel from the date picker below) ─── */
.tp-panel {
    width: 240px;
}

.tp-columns {
    display: flex;
    align-items: stretch;
    gap: var(--space-sm);
    padding: var(--space-md);
}

.tp-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.tp-column-label {
    text-align: center;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding-bottom: var(--space-xs);
}

.tp-column-sep {
    align-self: center;
    margin-top: var(--space-lg);
    font-weight: 700;
    color: var(--color-text-muted);
}

.tp-list {
    height: 200px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
    scroll-behavior: smooth;
}

.tp-item {
    flex-shrink: 0;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    padding: var(--space-sm) 0;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.tp-item:hover {
    background: rgba(102, 126, 234, 0.12);
    color: var(--color-primary);
}

.tp-item--selected {
    background: var(--color-gradient);
    color: white;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.tp-confirm {
    width: calc(100% - var(--space-md) * 2);
    margin: 0 var(--space-md) var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 700;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.tp-confirm:hover {
    opacity: 0.9;
}

/* ─── Custom Calendar Date Picker ─── */
.dp-wrapper {
    position: relative;
    margin-bottom: var(--space-xl);
}

/* Trigger button */
.dp-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    cursor: pointer;
    text-align: left;
    transition: border-color var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
}

.dp-trigger:hover {
    border-color: var(--color-primary);
}

.dp-trigger--has-value {
    color: var(--color-text-primary);
    border-color: var(--color-primary);
}

.dp-trigger__icon {
    flex-shrink: 0;
    color: var(--color-text-muted);
}

.dp-trigger--has-value .dp-trigger__icon {
    color: var(--color-primary);
}

.dp-trigger__text {
    flex: 1;
}

.dp-trigger__chevron {
    flex-shrink: 0;
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
}

.dp-trigger[aria-expanded="true"] .dp-trigger__chevron {
    transform: rotate(180deg);
}

/* Calendar panel */
.dp-panel {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 100;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px) scale(0.98);
    pointer-events: none;
    transition: opacity 180ms ease, transform 180ms ease;
}

.dp-panel--open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

/* Panel header */
.dp-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-md);
    background: var(--color-gradient);
}

.dp-month-year {
    font-weight: 700;
    font-size: var(--font-size-base);
    color: white;
    letter-spacing: 0.02em;
}

.dp-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.2);
    color: white;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.dp-nav:hover {
    background: rgba(255,255,255,0.35);
}

/* Weekday headers */
.dp-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    padding: var(--space-sm) var(--space-sm) 0;
    gap: 2px;
}

.dp-weekday {
    text-align: center;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.06em;
    padding: var(--space-xs) 0;
}

/* Day grid */
.dp-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    padding: var(--space-xs) var(--space-sm) var(--space-md);
}

.dp-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.dp-day--empty {
    pointer-events: none;
}

.dp-day:not(.dp-day--empty):not(.dp-day--past):hover {
    background: rgba(102, 126, 234, 0.12);
    color: var(--color-primary);
}

.dp-day--past {
    color: var(--color-text-muted);
    opacity: 0.45;
    cursor: default;
}

.dp-day--today {
    font-weight: 700;
    box-shadow: inset 0 0 0 2px var(--color-primary);
    color: var(--color-primary);
}

.dp-day--selected {
    background: var(--color-gradient) !important;
    color: white !important;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.char-counter {
    text-align: left;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.cta-button,
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    background: var(--color-gradient);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    width: 100%;
}

.cta-button:hover,
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.cta-button:disabled,
.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: transparent;
    color: var(--color-text-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
}

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

/* ==========================================================================
   Email Page (also used for User Info page)
   ========================================================================== */

.email-container {
    width: 100%;
    padding: var(--space-md);
}

.email-icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.email-icon svg {
    color: var(--color-primary);
}

.email-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-sm);
}

.email-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--space-xl);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.form-input {
    width: 100%;
    padding: var(--space-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-input.error {
    border-color: var(--color-error);
}

/* Consent Section */
.consent-section {
    margin-bottom: var(--space-xl);
}

.consent-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    cursor: pointer;
    position: relative;
}

.consent-item input[type="checkbox"] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.consent-checkbox {
    width: 22px;
    height: 22px;
    border: 2px solid var(--color-border);
    border-radius: 6px;
    flex-shrink: 0;
    position: relative;
    transition: all var(--transition-base);
    margin-top: 2px;
}

.consent-item input:checked + .consent-checkbox {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.consent-item input:checked + .consent-checkbox::after {
    content: '';
    position: absolute;
    top: 4px;
    left: 7px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.consent-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.required-star {
    color: var(--color-error);
}

.privacy-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-lg);
}

/* Options list inside email form (for user-info page) */
.email-form .options-list {
    margin-bottom: var(--space-lg);
}

/* ==========================================================================
   Loading Page
   ========================================================================== */

.loading-container {
    width: 100%;
    padding: var(--space-md);
}

.loading-card {
    text-align: center;
    padding: var(--space-3xl) var(--space-2xl);
}

.magic-animation {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto var(--space-xl);
}

.magic-circle {
    position: absolute;
    inset: 0;
    border: 3px solid transparent;
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1.5s linear infinite;
}

.magic-circle::before {
    content: '';
    position: absolute;
    inset: 6px;
    border: 3px solid transparent;
    border-top-color: var(--color-secondary);
    border-radius: 50%;
    animation: spin 2s linear infinite reverse;
}

.magic-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-primary);
    animation: pulse 2s ease-in-out infinite;
}

.magic-sparkles span {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: sparkle 2s ease-in-out infinite;
}

.magic-sparkles span:nth-child(1) { top: 0; left: 50%; animation-delay: 0s; }
.magic-sparkles span:nth-child(2) { top: 20%; right: 10%; animation-delay: 0.3s; }
.magic-sparkles span:nth-child(3) { bottom: 20%; right: 10%; animation-delay: 0.6s; }
.magic-sparkles span:nth-child(4) { bottom: 0; left: 50%; animation-delay: 0.9s; }
.magic-sparkles span:nth-child(5) { bottom: 20%; left: 10%; animation-delay: 1.2s; }
.magic-sparkles span:nth-child(6) { top: 20%; left: 10%; animation-delay: 1.5s; }

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

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.1); }
}

@keyframes sparkle {
    0%, 100% { opacity: 0; transform: scale(0); }
    50% { opacity: 1; transform: scale(1); }
}

.loading-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
}

.loading-messages {
    height: 48px;
    margin-bottom: var(--space-lg);
}

.loading-message {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    opacity: 0;
    transition: opacity var(--transition-slow);
    position: absolute;
    left: 0;
    right: 0;
}

.loading-message.active {
    opacity: 1;
    position: relative;
}

.loading-dots {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
}

.loading-dots span {
    width: 10px;
    height: 10px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.16s; }
.loading-dots span:nth-child(3) { animation-delay: 0.32s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* Error State */
.error-state {
    text-align: center;
}

.error-state svg {
    color: var(--color-error);
    margin-bottom: var(--space-lg);
}

.error-state h2 {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    margin-bottom: var(--space-xl);
}

/* ==========================================================================
   Letter Page
   ========================================================================== */

.letter-container {
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-md);
}

.letter-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.success-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(39, 174, 96, 0.1);
    color: var(--color-success);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.letter-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--space-sm);
}

.letter-intro {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.9);
}

.letter-card {
    max-width: 100%;
    padding: var(--space-2xl);
}

.letter-content {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-text-primary);
    white-space: pre-wrap;
}

.letter-actions {
    text-align: center;
    margin-top: var(--space-xl);
}

.email-sent-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-lg);
}

.email-sent-note svg {
    color: var(--color-success);
}

.letter-actions .cta-button {
    width: auto;
    padding: var(--space-md) var(--space-2xl);
}

.cta-subtext {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--space-md);
}

/* ==========================================================================
   Error Messages
   ========================================================================== */

.error-message {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 640px) {
    :root {
        --space-2xl: 32px;
        --space-3xl: 48px;
    }
    
    .welcome-card,
    .question-card,
    .email-card,
    .loading-card,
    .letter-card {
        padding: var(--space-lg);
        border-radius: var(--radius-lg);
    }
    
    .welcome-title {
        font-size: var(--font-size-2xl);
    }
    
    .question-title {
        font-size: var(--font-size-xl);
    }
    
    .letter-title {
        font-size: var(--font-size-2xl);
    }
    
    .form-actions {
        flex-direction: column-reverse;
        gap: var(--space-md);
    }
    
    .form-actions .btn-secondary,
    .form-actions .btn-primary {
        width: 100%;
        justify-content: center;
    }
    
    .language-switcher {
        top: var(--space-sm);
        right: var(--space-sm);
    }
    
    .lang-dropdown-toggle {
        padding: var(--space-xs) var(--space-sm);
        font-size: 13px;
    }
    
    .lang-flag {
        font-size: 16px;
    }
    
    .lang-dropdown-menu {
        min-width: 140px;
    }
    
    .lang-dropdown-item {
        padding: var(--space-xs) var(--space-sm);
        font-size: 13px;
    }
    
    .letter-content {
        font-size: var(--font-size-base);
    }
}

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

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}