/**
 * ENROLLMENT WIZARD STYLESHEET
 * ===========================================================================
 * Mobile-first responsive design for student enrollment wizard
 * Minimalist black & white theme matching admin dashboard
 *
 * Design Philosophy:
 * - Mobile-first: All base styles optimized for small screens
 * - Progressive enhancement: Desktop features added via media queries
 * - High contrast: Black/white with strategic gray accents
 * - Smooth interactions: Subtle animations enhance UX without distraction
 * - Accessibility: WCAG 2.1 AA compliant with focus indicators
 *
 * Color Palette (Professional Workspace Theme):
 * - Primary Teal: hsl(185 85% 35%) (main brand color)
 * - Primary Glow: hsl(185 85% 45%) (hover effects)
 * - Accent Golden: hsl(45 93% 58%) (highlights, CTAs)
 * - Secondary Gray: hsl(210 40% 94%) (secondary elements)
 * - Success Green: hsl(142 70% 45%) (success states)
 * - Warning Orange: hsl(38 92% 50%) (warnings)
 * - Destructive Red: hsl(0 84% 60%) (errors)
 * - Background: hsl(210 20% 98%) (main background)
 * - Foreground: hsl(215 25% 12%) (main text)
 * - Card: hsl(0 0% 100%) (card backgrounds)
 * - Border: hsl(210 40% 90%) (borders)
 * ===========================================================================
 */

/* ============================================================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ============================================================================ */
:root {
    /* Professional Workspace Color Schema */
    --primary: hsl(185 85% 35%);
    --primary-glow: hsl(185 85% 45%);
    --accent: hsl(45 93% 58%);
    --secondary: hsl(210 40% 94%);
    --success: hsl(142 70% 45%);
    --warning: hsl(38 92% 50%);
    --destructive: hsl(0 84% 60%);
    --background: hsl(210 20% 98%);
    --foreground: hsl(215 25% 12%);
    --card: hsl(0 0% 100%);
    --border: hsl(210 40% 90%);
    --muted: hsl(210 40% 96%);
    --muted-foreground: hsl(215 15% 46%);
 

    /* Spacing Scale */
    --spacing-1: 0.25rem;  /* 4px */
    --spacing-2: 0.5rem;   /* 8px */
    --spacing-3: 0.75rem;  /* 12px */
    --spacing-4: 1rem;     /* 16px */
    --spacing-5: 1.25rem;  /* 20px */
    --spacing-6: 1.5rem;   /* 24px */
    --spacing-8: 2rem;     /* 32px */
    --spacing-10: 2.5rem;  /* 40px */
    --spacing-12: 3rem;    /* 48px */
    --spacing-16: 4rem;    /* 64px */

    /* Border Radius */
    --radius-sm: 0.25rem;  /* 4px */
    --radius-md: 0.5rem;   /* 8px */
    --radius-lg: 0.75rem;  /* 12px */
    --radius-xl: 1rem;     /* 16px */
    --radius-2xl: 1.5rem;  /* 24px */
    --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, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 500ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --transition-elastic: 800ms cubic-bezier(0.175, 0.885, 0.32, 1.275);

    /* Layout */
    --max-width-sm: 640px;
    --max-width-md: 768px;
    --max-width-lg: 1024px;
    --max-width-wizard: 720px;

    /* Z-index Scale */
    --z-base: 1;
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-modal-backdrop: 50;
    --z-modal: 60;
    --z-toast: 70;
}

/* ============================================================================
   RESET & BASE STYLES
   ============================================================================ */

/* Apply border-box globally for predictable sizing */
*, *::before, *::after {
    box-sizing: border-box;
}

/* Skip links for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-black);
    color: var(--color-white);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
    font-weight: var(--font-weight-semibold);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

.skip-link:hover {
    background: var(--color-gray-900);
}

/* Reset margins and paddings for consistent spacing */
.enrollment-page {
    margin: 0;
    padding: 0;
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-gray-900);
    background: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================================================
   HERO SECTION
   ============================================================================ */

/**
 * Hero Section Design Rationale:
 * - Black background creates strong visual hierarchy
 * - White text ensures high contrast (WCAG AAA)
 * - Minimal padding on mobile, increased on desktop
 * - Centered content for focus and balance
 */
.hero-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-secondary) 100%);
    color: var(--color-white);
    padding: var(--spacing-12) var(--spacing-4);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Enhanced gradient overlay with animated particles */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 50%, transparent 100%);
    pointer-events: none;
    animation: heroShimmer 8s ease-in-out infinite;
}

/* Animated background particles */
.hero-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.1) 1px, transparent 1px),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        radial-gradient(circle at 40% 60%, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 50px 50px, 80px 80px, 60px 60px;
    animation: heroParticles 20s linear infinite;
    pointer-events: none;
    opacity: 0.3;
}

@keyframes heroShimmer {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

@keyframes heroParticles {
    0% { transform: translateY(0) translateX(0); }
    100% { transform: translateY(-100px) translateX(50px); }
}

.hero-content {
    max-width: var(--max-width-md);
    margin: 0 auto;
    position: relative;
    z-index: var(--z-base);
}

/**
 * Typography Hierarchy:
 * - Hero title is largest, establishing primary focus
 * - Responsive sizing ensures readability across devices
 */
.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin: 0 0 var(--spacing-4);
    letter-spacing: -0.025em;
    animation: heroTitleSlide 1s ease-out;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes heroTitleSlide {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    margin: 0 0 var(--spacing-8);
    color: var(--color-gray-300);
}

/* Tablet and up: Increase hero typography */
@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-xl);
    }
}

/* ============================================================================
   WIZARD CONTAINER
   ============================================================================ */

/**
 * Wizard Container Design Rationale:
 * - White background with subtle shadow for card elevation
 * - Max-width constraint improves readability and focus
 * - Generous padding creates breathing room
 * - Negative margin pulls card up over hero for visual interest
 */
.wizard-container {
    max-width: var(--max-width-wizard);
    margin: -4rem auto 4rem;
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: 
        0 20px 25px -5px rgba(0, 0, 0, 0.1), 
        0 10px 10px -5px rgba(0, 0, 0, 0.04),
        0 0 0 1px rgba(0, 0, 0, 0.05);
    position: relative;
    z-index: var(--z-base);
    animation: wizardSlideUp 0.8s ease-out;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

@keyframes wizardSlideUp {
    0% {
        opacity: 0;
        transform: translateY(50px) scale(0.95);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Enhanced Alert Styles */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    border: 1px solid;
    position: relative;
    animation: alertSlideIn 0.3s ease-out;
}

.alert-error {
    background-color: var(--color-error-light);
    border-color: var(--color-error);
    color: var(--color-error-dark);
}

.alert-success {
    background-color: var(--color-success-light);
    border-color: var(--color-success);
    color: var(--color-success-dark);
}

.alert-warning {
    background-color: var(--color-warning-light);
    border-color: var(--color-warning);
    color: var(--color-warning-dark);
}

.alert-info {
    background-color: var(--muted);
    border-color: var(--primary);
    color: var(--foreground);
}

.alert-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.alert-content {
    flex: 1;
    min-width: 0;
}

.alert-message {
    font-weight: 500;
    line-height: 1.5;
}

.alert-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

.alert-actions .btn {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
}

.btn-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.btn-close:hover {
    opacity: 1;
}

.btn-close:focus {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}

/* Help content styling */
.help-content h3 {
    margin: 0 0 0.75rem 0;
    font-size: 1.125rem;
    font-weight: 600;
}

.help-content p {
    margin: 0 0 0.75rem 0;
    line-height: 1.5;
}

.help-content ul {
    margin: 0 0 0.75rem 0;
    padding-left: 1.25rem;
}

.help-content li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.help-content strong {
    font-weight: 600;
}

/* Alert animations */
@keyframes alertSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile: Reduce negative margin for smaller screens */
@media (max-width: 767px) {
    .wizard-container {
        margin: -2rem var(--spacing-4) var(--spacing-8);
        border-radius: var(--radius-xl);
        /* Enhanced mobile touch targets */
        touch-action: manipulation;
    }

    /* Improved mobile typography */
    .hero-title {
        font-size: var(--font-size-2xl);
        line-height: 1.3;
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
        line-height: 1.5;
    }

    /* Better mobile form spacing */
    .form-group {
        margin-bottom: var(--spacing-5);
    }

    .form-input,
    .form-select,
    .form-textarea {
        font-size: 16px; /* Prevent zoom on iOS */
        padding: var(--spacing-4);
        min-height: 52px; /* Larger touch target */
    }

    /* Enhanced mobile buttons */
    .btn {
        min-height: 52px;
        font-size: var(--font-size-base);
        padding: var(--spacing-4) var(--spacing-6);
    }

    /* Mobile-optimized group cards */
    .group-card {
        padding: var(--spacing-6);
        margin-bottom: var(--spacing-4);
        /* Better touch feedback */
        -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
    }

    .group-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }

    /* Mobile progress indicator */
    .progress-step {
        min-width: 60px;
    }

    .step-circle {
        width: 2.5rem;
        height: 2.5rem;
        font-size: var(--font-size-sm);
    }

    .step-label {
        font-size: 0.625rem;
        margin-top: var(--spacing-1);
    }

    /* Mobile navigation improvements */
    .wizard-actions {
        gap: var(--spacing-3);
        padding-top: var(--spacing-5);
    }

    /* Mobile social login */
    .btn-social {
        min-height: 52px;
        font-size: var(--font-size-base);
    }

    /* Mobile confirmation layout */
    .confirmation-data {
        grid-template-columns: 1fr;
        gap: var(--spacing-3);
    }

    .data-item {
        padding: var(--spacing-3);
        background: var(--color-white);
        border-radius: var(--radius-md);
        border: 1px solid var(--color-gray-200);
    }

    /* Touch feedback for mobile */
    .touch-active {
        transform: scale(0.98);
        opacity: 0.8;
        transition: all 0.1s ease;
    }

    /* Mobile-specific animations */
    .wizard-step.slide-in {
        animation: slideInRightMobile var(--transition-base);
    }

    .wizard-step.slide-out {
        animation: slideOutLeftMobile var(--transition-base);
    }

    @keyframes slideInRightMobile {
        from {
            opacity: 0;
            transform: translateX(30px) translateZ(0);
        }
        to {
            opacity: 1;
            transform: translateX(0) translateZ(0);
        }
    }

    @keyframes slideOutLeftMobile {
        from {
            opacity: 1;
            transform: translateX(0) translateZ(0);
        }
        to {
            opacity: 0;
            transform: translateX(-30px) translateZ(0);
        }
    }

    /* Enhanced mobile alerts */
    .alert {
        padding: 0.875rem;
        margin-bottom: 0.875rem;
        border-radius: 0.375rem;
    }

    .alert-actions {
        margin-top: 0.625rem;
        gap: 0.375rem;
    }

    .alert-actions .btn {
        font-size: 0.8125rem;
        padding: 0.3125rem 0.625rem;
        flex: 1;
        min-width: 0;
    }

    .btn-close {
        top: 0.625rem;
        right: 0.625rem;
        font-size: 1.125rem;
    }

    .help-content {
        font-size: 0.875rem;
    }

    .help-content h3 {
        font-size: 1rem;
    }

    .help-content ul {
        padding-left: 1rem;
    }
}

.wizard-inner {
    padding: var(--spacing-6);
}

/* Desktop: Increase padding for more breathing room */
@media (min-width: 768px) {
    .wizard-inner {
        padding: var(--spacing-10);
    }
}

/* ============================================================================
   PROGRESS INDICATOR
   ============================================================================ */

/**
 * Progress Indicator Design Rationale:
 * - Visual feedback of wizard position reduces cognitive load
 * - Step circles clearly show completed, current, and upcoming steps
 * - Connecting lines show progression flow
 * - Mobile: Horizontal scroll if needed, touch-friendly targets
 */
.progress-indicator {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-8);
    position: relative;
    padding: 0 var(--spacing-2);
}

/* Connecting line between steps */
.progress-line {
    position: absolute;
    top: 1.5rem;
    left: 2rem;
    right: 2rem;
    height: 2px;
    background: var(--color-gray-300);
    z-index: 0;
}

/* Active progress line fills as user advances */
.progress-line-active {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--color-black) 0%, var(--color-gray-800) 100%);
    transition: width var(--transition-smooth);
    border-radius: var(--radius-full);
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.3);
    animation: progressPulse 2s ease-in-out infinite;
}

@keyframes progressPulse {
    0%, 100% { box-shadow: 0 0 8px rgba(0, 0, 0, 0.3); }
    50% { box-shadow: 0 0 12px rgba(0, 0, 0, 0.5); }
}

/* Individual step in progress indicator */
.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: var(--z-base);
    flex: 1;
    min-width: 0; /* Allows text to truncate */
}

/**
 * Step Circle Design:
 * - Large touch target (48px minimum per WCAG)
 * - Clear visual states: pending, active, completed
 * - Smooth transitions between states
 */
.step-circle {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-2);
    position: relative;
}

/* Pending step: Gray outline, white fill */
.step-circle.step-pending {
    background: var(--color-white);
    border: 2px solid var(--color-gray-300);
    color: var(--color-gray-500);
}

/* Active step: Black fill, white text */
.step-circle.step-active {
    background: var(--color-black);
    border: 2px solid var(--color-black);
    color: var(--color-white);
    box-shadow: 
        0 0 0 4px rgba(0, 0, 0, 0.1),
        0 4px 12px rgba(0, 0, 0, 0.15);
    animation: stepActivePulse 1.5s ease-in-out infinite;
    transform: scale(1.05);
}

@keyframes stepActivePulse {
    0%, 100% { 
        box-shadow: 
            0 0 0 4px rgba(0, 0, 0, 0.1),
            0 4px 12px rgba(0, 0, 0, 0.15);
    }
    50% { 
        box-shadow: 
            0 0 0 6px rgba(0, 0, 0, 0.15),
            0 6px 16px rgba(0, 0, 0, 0.2);
    }
}

/* Completed step: Black fill with checkmark */
.step-circle.step-completed {
    background: var(--color-black);
    border: 2px solid var(--color-black);
    color: var(--color-white);
}

/* Checkmark icon for completed steps */
.step-circle.step-completed::after {
    content: '✓';
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    animation: checkmarkAppear 0.5s ease-out;
    color: var(--color-success);
}

@keyframes checkmarkAppear {
    0% {
        opacity: 0;
        transform: scale(0) rotate(-45deg);
    }
    50% {
        opacity: 1;
        transform: scale(1.2) rotate(0deg);
    }
    100% {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

/* Step labels below circles */
.step-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-500);
    text-align: center;
    transition: color var(--transition-base);
    word-break: break-word;
}

.step-active .step-label {
    color: var(--color-black);
    font-weight: var(--font-weight-semibold);
}

.step-completed .step-label {
    color: var(--color-gray-700);
}

/* Mobile: Smaller step circles for space efficiency */
@media (max-width: 640px) {
    .step-circle {
        width: 2.5rem;
        height: 2.5rem;
        font-size: var(--font-size-xs);
    }

    .step-label {
        font-size: 0.625rem;
    }

    .progress-line {
        top: 1.25rem;
        left: 1.5rem;
        right: 1.5rem;
    }
}

/* ============================================================================
   WIZARD FORM STEPS
   ============================================================================ */

/**
 * Step Container Design Rationale:
 * - Only one step visible at a time (single-column focus)
 * - Smooth slide transitions between steps
 * - Hidden steps removed from layout and screen readers
 */
.wizard-step {
    display: none;
    opacity: 0;
    transform: translateX(20px);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

/* Active step is visible and accessible */
.wizard-step.active {
    display: block;
    opacity: 1;
    transform: translateX(0);
}

/* Slide animation classes for smooth transitions */
.wizard-step.slide-in {
    animation: slideInRight var(--transition-base);
}

.wizard-step.slide-out {
    animation: slideOutLeft var(--transition-base);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutLeft {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(-20px);
    }
}

/* Step header with title and description */
.step-header {
    margin-bottom: var(--spacing-8);
    text-align: center;
}

.step-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin: 0 0 var(--spacing-3);
    line-height: 1.3;
}

.step-description {
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
    margin: 0;
    line-height: 1.6;
}

/* ============================================================================
   FORM ELEMENTS
   ============================================================================ */

/**
 * Form Design Rationale:
 * - Large, touch-friendly inputs (minimum 44px height per WCAG)
 * - Clear labels with proper association via 'for' attribute
 * - Inline validation feedback for immediate user response
 * - High contrast borders and focus states for visibility
 */
.form-group {
    margin-bottom: var(--spacing-6);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

/* Required field indicator */
.form-label .required {
    color: var(--color-error);
    margin-left: var(--spacing-1);
}

/**
 * Input Field Design:
 * - Consistent 48px height for touch accessibility
 * - 1px border provides subtle definition
 * - Focus state with bold border and subtle shadow
 * - Transitions smooth for polished feel
 */
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    font-family: var(--font-family-primary);
    color: var(--color-gray-900);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    min-height: 48px;
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.6;
}

/* Focus state: Bold black border with subtle shadow */
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-black);
    box-shadow: 
        0 0 0 3px rgba(0, 0, 0, 0.05),
        0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
    transition: all var(--transition-base);
}

/* Enhanced hover state */
.form-input:hover:not(:focus):not(:disabled),
.form-select:hover:not(:focus):not(:disabled),
.form-textarea:hover:not(:focus):not(:disabled) {
    border-color: var(--color-gray-500);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-fast);
}

/* Placeholder styling */
.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-gray-500);
}

/* Disabled state */
.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background: var(--color-gray-100);
    color: var(--color-gray-500);
    cursor: not-allowed;
}

/* ============================================================================
   VALIDATION STATES
   ============================================================================ */

/**
 * Validation Design Rationale:
 * - Immediate visual feedback on field validity
 * - Color-coded borders (red = error, green = success)
 * - Helper text provides context and guidance
 * - Icons reinforce state for non-color-blind users
 */

/* Error state: Red border and background tint */
.form-input.is-invalid,
.form-select.is-invalid,
.form-textarea.is-invalid {
    border-color: var(--color-error);
    background: rgba(239, 68, 68, 0.02);
}

.form-input.is-invalid:focus,
.form-select.is-invalid:focus,
.form-textarea.is-invalid:focus {
    border-color: var(--color-error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* Success state: Green border */
.form-input.is-valid,
.form-select.is-valid,
.form-textarea.is-valid {
    border-color: var(--color-success);
}

.form-input.is-valid:focus,
.form-select.is-valid:focus,
.form-textarea.is-valid:focus {
    border-color: var(--color-success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Error message text */
.form-error {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-error);
}

/* Helper text for guidance */
.form-help {
    display: block;
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* Error suggestions */
.error-suggestions {
    margin-top: var(--spacing-1);
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
    font-style: italic;
}

/* Success message */
.form-success {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-success);
    animation: successSlide 0.3s ease-out;
}

@keyframes successSlide {
    0% {
        opacity: 0;
        transform: translateY(-10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================================
   GROUP SELECTION CARDS - PERFECTED UI/UX
   ============================================================================ */

/* Single Group Container */
.single-group-container {
    margin-bottom: var(--spacing-8);
}

.single-group-card {
    position: relative;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: 
        0 8px 40px rgba(0, 0, 0, 0.08),
        0 2px 8px rgba(0, 0, 0, 0.06);
    transition: all var(--transition-base);
}

.single-group-card:hover {
    transform: translateY(-4px);
    box-shadow: 
        0 16px 60px rgba(0, 0, 0, 0.12),
        0 4px 16px rgba(0, 0, 0, 0.1);
    border-color: var(--color-primary);
}

.group-card-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success), var(--color-primary-dark));
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.group-card-content {
    padding: var(--spacing-4);
    position: relative;
    z-index: 1;
}

/* Group Header */
.group-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-3);
}

.group-header-left {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    flex: 1;
}

.group-header-right {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.group-icon-container {
    position: relative;
    flex-shrink: 0;
}

.group-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.1),
        0 2px 6px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
}

.group-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
    border-radius: var(--radius-md);
}

/* Enhanced Group Checkbox Styles */
.group-checkbox {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 28px;
    height: 28px;
    border: 2.5px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background-color: var(--color-white);
    cursor: pointer;
    position: relative;
    transition: all var(--transition-base);
    flex-shrink: 0;
    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.05),
        inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* Hover state */
.group-checkbox:hover {
    border-color: var(--color-primary);
    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.1),
        0 0 0 4px rgba(0, 0, 0, 0.03);
    transform: scale(1.05);
}

/* Checked state */
.group-checkbox:checked {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-color: var(--color-primary);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.15),
        0 0 0 4px rgba(0, 0, 0, 0.05),
        inset 0 1px 3px rgba(255, 255, 255, 0.3);
}

/* Checkmark icon */
.group-checkbox:checked::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 14px;
    height: 14px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    animation: checkmarkPop 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

@keyframes checkmarkPop {
    0% {
        transform: translate(-50%, -50%) scale(0) rotate(-45deg);
        opacity: 0;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2) rotate(0deg);
    }
    100% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
        opacity: 1;
    }
}

/* Focus state for accessibility */
.group-checkbox:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
    border-color: var(--color-primary);
}

/* Disabled state */
.group-checkbox:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-300);
}

.group-checkbox:disabled:hover {
    transform: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Active/pressed state */
.group-checkbox:active:not(:disabled) {
    transform: scale(0.95);
    box-shadow:
        0 1px 2px rgba(0, 0, 0, 0.1),
        inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Enhance card when checkbox is checked */
.group-card:has(.group-checkbox:checked) {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    box-shadow:
        0 0 0 4px rgba(0, 0, 0, 0.05),
        0 12px 40px rgba(0, 0, 0, 0.15);
    transform: translateY(-4px) scale(1.02);
}

.group-card:has(.group-checkbox:checked)::before {
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    height: 6px;
}

.group-status-indicator {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--color-white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.group-status-indicator.available {
    background: var(--color-success);
    color: var(--color-white);
}

.group-status-indicator.full {
    background: var(--color-error);
    color: var(--color-white);
}

.group-info {
    flex: 1;
    min-width: 0;
}

.group-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin: 0;
    line-height: 1.2;
}

.group-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.group-badge.available {
    background: linear-gradient(135deg, var(--color-success-light), var(--color-success));
    color: var(--color-white);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.group-badge.full {
    background: linear-gradient(135deg, var(--color-error-light), var(--color-error));
    color: var(--color-white);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* Group Description */
.group-description {
    margin-bottom: var(--spacing-3);
}

.group-description p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    line-height: 1.5;
    margin: 0;
}

/* Group Features */
.group-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-200);
}

.feature-item:hover {
    background: var(--color-white);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.feature-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
}

.feature-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.feature-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.feature-value {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-800);
}

/* Enrollment Status */
.enrollment-status {
    margin-bottom: var(--spacing-4);
}

.enrollment-progress {
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--color-gray-200);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-3);
}

.progress-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-700);
}

.progress-percentage {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-3);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-success), var(--color-success-dark));
    border-radius: var(--radius-full);
    transition: width 0.8s ease;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: progressShimmer 2s infinite;
}

@keyframes progressShimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.spots-remaining {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
}

.enrollment-status-text {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-success);
}

/* Group CTA */
.group-cta {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    color: var(--color-white);
}

.cta-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cta-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.cta-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
}

.cta-subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.cta-indicator {
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Multiple Groups Selection */
.group-selection-container {
    margin-bottom: var(--spacing-8);
}

.group-filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-6);
    padding: var(--spacing-4);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
}

.filter-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.filter-label {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-black);
}

.filter-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.filter-actions {
    display: flex;
    gap: var(--spacing-2);
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    cursor: pointer;
    transition: all var(--transition-base);
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* Group Grid */
.group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-3);
}

.group-card {
    position: relative;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--color-white);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.group-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-gray-200);
    transition: all var(--transition-base);
}

.group-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-6px);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.12),
        0 4px 16px rgba(0, 0, 0, 0.08);
}

.group-card:hover::before {
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
    height: 6px;
}

/* Selected state */
.group-card.selected {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    box-shadow: 
        0 0 0 4px rgba(0, 0, 0, 0.05),
        0 12px 40px rgba(0, 0, 0, 0.15);
    transform: translateY(-4px) scale(1.02);
    animation: cardSelected 0.5s ease-out;
}

.group-card.selected::before {
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    height: 6px;
}

@keyframes cardSelected {
    0% {
        transform: translateY(-4px) scale(1.02);
        box-shadow: 
            0 0 0 4px rgba(0, 0, 0, 0.05),
            0 12px 40px rgba(0, 0, 0, 0.15);
    }
    50% {
        transform: translateY(-8px) scale(1.04);
        box-shadow: 
            0 0 0 6px rgba(0, 0, 0, 0.1),
            0 16px 60px rgba(0, 0, 0, 0.2);
    }
    100% {
        transform: translateY(-4px) scale(1.02);
        box-shadow: 
            0 0 0 4px rgba(0, 0, 0, 0.05),
            0 12px 40px rgba(0, 0, 0, 0.15);
    }
}

/* Disabled state */
.group-card.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--color-gray-100);
    border-color: var(--color-gray-300);
}

.group-card.disabled:hover {
    transform: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.group-card.disabled::before {
    background: var(--color-gray-300);
}

/* Hidden radio input */
.group-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

/* Card Inner Content */
.group-card-inner {
    position: relative;
}

.group-card-content {
    padding: var(--spacing-4);
    position: relative;
    z-index: 1;
}

.group-card-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin: 0 0 var(--spacing-2) 0;
    line-height: 1.3;
}

.group-card-description {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
    margin: 0 0 var(--spacing-3) 0;
    line-height: 1.4;
}

/* Group Footer */
.group-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-5);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--color-gray-200);
}

.group-price {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.price-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-success);
    background: var(--color-success-light);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-md);
}

.select-indicator {
    width: 32px;
    height: 32px;
    border: 2px solid var(--color-gray-300);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-400);
    transition: all var(--transition-base);
}

.group-card.selected .select-indicator {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.1);
}

/* Focus states for accessibility */
.group-card:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

.group-card:focus-visible::before {
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
}

/**
 * Group Card Design:
 * - Clickable card with radio button
 * - Clear hover and selected states
 * - Shows availability status
 * - Mobile-optimized spacing
 */
.group-card {
    position: relative;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--color-white);
}

.group-card:hover {
    border-color: var(--color-gray-500);
    box-shadow: 
        0 8px 25px rgba(0, 0, 0, 0.1),
        0 4px 12px rgba(0, 0, 0, 0.05);
    transform: translateY(-4px) scale(1.02);
    transition: all var(--transition-base);
}

/* Selected state: Bold black border */
.group-card.selected {
    border-color: var(--color-black);
    background: var(--color-gray-50);
    box-shadow: 
        0 0 0 3px rgba(0, 0, 0, 0.05),
        0 8px 25px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px) scale(1.01);
    animation: cardSelected 0.3s ease-out;
}

@keyframes cardSelected {
    0% {
        transform: translateY(-2px) scale(1.01);
        box-shadow: 
            0 0 0 3px rgba(0, 0, 0, 0.05),
            0 8px 25px rgba(0, 0, 0, 0.15);
    }
    50% {
        transform: translateY(-4px) scale(1.03);
        box-shadow: 
            0 0 0 5px rgba(0, 0, 0, 0.1),
            0 12px 30px rgba(0, 0, 0, 0.2);
    }
    100% {
        transform: translateY(-2px) scale(1.01);
        box-shadow: 
            0 0 0 3px rgba(0, 0, 0, 0.05),
            0 8px 25px rgba(0, 0, 0, 0.15);
    }
}

/* Disabled/full group state */
.group-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--color-gray-100);
}

.group-card.disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Hidden radio input (visual state handled by card) */
.group-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.group-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--spacing-3);
}

.group-card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-black);
    margin: 0;
}

/* Availability badge */
.group-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.group-badge.available {
    background: var(--color-success-light);
    color: var(--color-success);
}

.group-badge.full {
    background: var(--color-error-light);
    color: var(--color-error);
}

.group-card-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin: 0 0 var(--spacing-3);
    line-height: 1.6;
}

/* Group metadata (dates, sessions, etc.) */
.group-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
}

.group-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* ============================================================================
   CONFIRMATION/REVIEW STEP
   ============================================================================ */

/**
 * Confirmation Step Design Rationale:
 * - Shows all entered data for user review
 * - Editable links allow quick corrections
 * - Clear visual separation between sections
 * - Prominent submit button
 */
.confirmation-section {
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin-bottom: var(--spacing-6);
}

.confirmation-section:last-child {
    margin-bottom: 0;
}

.confirmation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-3);
    border-bottom: 1px solid var(--color-gray-300);
}

.confirmation-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-black);
    margin: 0;
}

/* Edit link to return to step */
.edit-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    text-decoration: underline;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.edit-link:hover {
    color: var(--color-black);
}

/* Data display grid */
.confirmation-data {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
}

@media (min-width: 640px) {
    .confirmation-data {
        grid-template-columns: repeat(2, 1fr);
    }
}

.data-item {
    display: flex;
    flex-direction: column;
}

.data-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-1);
}

.data-value {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-900);
}

/* ============================================================================
   NAVIGATION BUTTONS
   ============================================================================ */

/**
 * Button Design Rationale:
 * - Large, touch-friendly targets (min 48px height)
 * - Clear visual hierarchy (primary vs. secondary)
 * - Smooth hover and active states
 * - Loading states for async operations
 */
.wizard-actions {
    display: flex;
    gap: var(--spacing-4);
    margin-top: var(--spacing-8);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--color-gray-200);
}

/* Mobile: Stack buttons vertically for easier tapping */
@media (max-width: 640px) {
    .wizard-actions {
        flex-direction: column-reverse;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family-primary);
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 48px;
    white-space: nowrap;
}

/* Primary button: Black background, white text */
.btn-primary {
    background: var(--color-black);
    color: var(--color-white);
    border-color: var(--color-black);
}

.btn-primary:hover {
    background: var(--color-gray-900);
    border-color: var(--color-gray-900);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 
        0 8px 25px rgba(0, 0, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-base);
}

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

/* Secondary button: White background, black border */
.btn-secondary {
    background: var(--color-white);
    color: var(--color-gray-900);
    border-color: var(--color-gray-300);
}

.btn-secondary:hover {
    border-color: var(--color-black);
    background: var(--color-gray-50);
}

/* Disabled button state */
.btn:disabled,
.btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Loading state */
.btn-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Enhanced loading spinner with gradient */
.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1.25rem;
    height: 1.25rem;
    margin: -0.625rem 0 0 -0.625rem;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-right-color: currentColor;
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
    filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.1));
}

/* Full-width button on mobile */
.btn-block {
    width: 100%;
}

@media (min-width: 641px) {
    .btn-block {
        width: auto;
    }
}

/* ============================================================================
   SUCCESS MESSAGE
   ============================================================================ */

/**
 * Success Message Design Rationale:
 * - Celebratory yet professional design
 * - Clear confirmation of successful enrollment
 * - Next steps guidance
 */
.success-message {
    text-align: center;
    padding: var(--spacing-8) var(--spacing-4);
}

.success-icon {
    width: 4rem;
    height: 4rem;
    margin: 0 auto var(--spacing-6);
    background: var(--color-success);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    animation: scaleIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.success-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin: 0 0 var(--spacing-4);
}

.success-text {
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
    margin: 0 0 var(--spacing-8);
    line-height: 1.6;
}

.success-details {
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin-bottom: var(--spacing-8);
    text-align: left;
}

/* ============================================================================
   ERROR & ALERT MESSAGES
   ============================================================================ */

/**
 * Alert Design Rationale:
 * - Color-coded for quick recognition
 * - Clear, concise messaging
 * - Dismissible for user control
 */
.alert {
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-6);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
}

.alert-error {
    background: var(--color-error-light);
    border: 1px solid var(--color-error);
    color: var(--color-error);
}

.alert-success {
    background: var(--color-success-light);
    border: 1px solid var(--color-success);
    color: var(--color-success);
}

.alert-info {
    background: var(--color-info-light);
    border: 1px solid var(--color-info);
    color: var(--color-info);
}

.alert-icon {
    flex-shrink: 0;
    font-size: var(--font-size-lg);
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--spacing-1);
}

.alert-message {
    margin: 0;
    font-size: var(--font-size-sm);
}

/* ============================================================================
   LOADING STATES
   ============================================================================ */

/**
 * Loading State Design Rationale:
 * - Skeleton screens prevent layout shift
 * - Subtle animation indicates loading
 * - Maintains visual structure during data fetch
 */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 25%,
        var(--color-gray-300) 50%,
        var(--color-gray-200) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 1rem;
    margin-bottom: var(--spacing-2);
}

.skeleton-button {
    height: 3rem;
    width: 100%;
}

/* ============================================================================
   ENHANCED FORM INTERACTIONS
   ============================================================================ */

/* Social Login Section */
.social-login-section {
    margin: var(--spacing-6) 0;
}

.divider {
    position: relative;
    text-align: center;
    margin: var(--spacing-6) 0;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-gray-300);
}

.divider span {
    background: var(--color-white);
    padding: 0 var(--spacing-4);
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

/* Social Login Buttons */
.btn-social {
    width: 100%;
    background: var(--color-white);
    border: 2px solid var(--color-gray-300);
    color: var(--color-gray-900);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    transition: all var(--transition-base);
}

.btn-social:hover {
    border-color: var(--color-gray-500);
    background: var(--color-gray-50);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-google:hover {
    border-color: var(--primary);
    background: rgba(66, 133, 244, 0.05);
}

.btn-social svg {
    flex-shrink: 0;
}

/* Floating label effect */
.form-group.floating-label {
    position: relative;
}

.form-group.floating-label .form-label {
    position: absolute;
    top: 50%;
    left: var(--spacing-4);
    transform: translateY(-50%);
    transition: all var(--transition-base);
    pointer-events: none;
    background: var(--color-white);
    padding: 0 var(--spacing-2);
    color: var(--color-gray-500);
}

.form-group.floating-label .form-input:focus + .form-label,
.form-group.floating-label .form-input:not(:placeholder-shown) + .form-label {
    top: 0;
    left: var(--spacing-3);
    font-size: var(--font-size-xs);
    color: var(--color-black);
    transform: translateY(-50%);
}

/* Input with icon */
.form-input-with-icon {
    position: relative;
}

.form-input-with-icon .form-input {
    padding-left: 3rem;
}

.form-input-with-icon .input-icon {
    position: absolute;
    left: var(--spacing-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-500);
    transition: color var(--transition-fast);
    pointer-events: none;
}

.form-input-with-icon .form-input:focus + .input-icon {
    color: var(--color-black);
}

/* Success checkmark for valid fields */
.form-input.is-valid::after {
    content: '✓';
    position: absolute;
    right: var(--spacing-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-success);
    font-weight: var(--font-weight-bold);
    animation: checkmarkSlide 0.3s ease-out;
}

@keyframes checkmarkSlide {
    0% {
        opacity: 0;
        transform: translateY(-50%) scale(0);
    }
    100% {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }
}

/* ============================================================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================================================ */

/**
 * Accessibility Design Rationale:
 * - Focus indicators for keyboard navigation
 * - Screen reader only content for context
 * - Reduced motion for users with vestibular disorders
 */

/* Visible focus indicator for keyboard navigation */
.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible,
.btn:focus-visible,
.group-card:focus-visible {
    outline: 2px solid var(--color-black);
    outline-offset: 2px;
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

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

/* ============================================================================
   PERFORMANCE OPTIMIZATIONS
   ============================================================================ */

/* Enable hardware acceleration for animations */
.wizard-container,
.step-circle,
.group-card,
.btn,
.form-input {
    will-change: transform;
    transform: translateZ(0);
}

/* Optimize animations to use transform and opacity only */
.wizard-step.active {
    transform: translateX(0) translateZ(0);
}

.wizard-step.slide-in {
    animation: slideInRight var(--transition-base);
    transform: translateZ(0);
}

.wizard-step.slide-out {
    animation: slideOutLeft var(--transition-base);
    transform: translateZ(0);
}

/* Reduce repaints with contain property */
.wizard-container {
    contain: layout style paint;
}

.progress-indicator {
    contain: layout;
}

.group-card {
    contain: layout style;
}

/* Optimize font loading */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400 800;
    font-display: swap;
    src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiJ-Ek-_EeA.woff2') format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+21D2, U+21D4, U+FEFF, U+FFFD;
}

/* Critical CSS for above-the-fold content */
.hero-section,
.wizard-container {
    content-visibility: auto;
}

/* ============================================================================
   RESPONSIVE UTILITIES
   ============================================================================ */

/* Hide on mobile */
@media (max-width: 767px) {
    .hide-mobile {
        display: none;
    }
}

/* Hide on desktop */
@media (min-width: 768px) {
    .hide-desktop {
        display: none;
    }
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.enrollment-footer {
    background: var(--color-black);
    color: var(--color-white);
    padding: var(--spacing-8) var(--spacing-4);
    text-align: center;
    margin-top: var(--spacing-16);
}

.enrollment-footer p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
}

.enrollment-footer a {
    color: var(--color-white);
    text-decoration: underline;
    transition: opacity var(--transition-fast);
}

.enrollment-footer a:hover {
    opacity: 0.8;
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */

@media print {
    .hero-section,
    .wizard-actions,
    .progress-indicator,
    .btn,
    .enrollment-footer {
        display: none !important;
    }

    .wizard-container {
        box-shadow: none;
        margin: 0;
    }

    .wizard-step {
        display: block !important;
        page-break-after: always;
    }
}