/* ============================================================================
   ENHANCED REGISTER STYLES - MODERN DESIGN WITH GLASSMORPHISM
   Fully CSP Compliant | WCAG AA+ Accessible | Responsive Design
   ============================================================================ */

/* ============================================================================
   CSS VARIABLES - COMPLETE THEME SYSTEM
   ============================================================================ */

:root {
    /* Light Theme - Default */
    --theme-bg: #ffffff;
    --theme-bg-secondary: #f8fafc;
    --theme-card-bg: rgba(255, 255, 255, 0.85);
    --theme-card-secondary: rgba(248, 250, 252, 0.9);
    --theme-border: rgba(226, 232, 240, 0.6);
    --theme-border-light: rgba(226, 232, 240, 0.3);
    --theme-text: #1e293b;
    --theme-text-secondary: #64748b;
    --theme-text-muted: #94a3b8;
    --theme-heading: #0f172a;
    --theme-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --theme-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Brand Colors - Light Theme */
    --theme-primary: #dc2626;
    --theme-primary-rgb: 220, 38, 38;
    --theme-primary-light: rgba(220, 38, 38, 0.1);
    --theme-success: #059669;
    --theme-success-rgb: 5, 150, 105;
    --theme-success-light: rgba(5, 150, 105, 0.1);
    --theme-warning: #d97706;
    --theme-warning-rgb: 217, 119, 6;
    --theme-warning-light: rgba(217, 119, 6, 0.1);
    --theme-danger: #dc2626;
    --theme-danger-rgb: 220, 38, 38;
    --theme-danger-light: rgba(220, 38, 38, 0.1);
    --theme-info: #2563eb;
    --theme-info-rgb: 37, 99, 235;
    --theme-info-light: rgba(37, 99, 235, 0.1);

    /* Gradients - Light Theme */
    --primary-gradient: linear-gradient(135deg, #dc2626 0%, #7c3aed 100%);
    --success-gradient: linear-gradient(135deg, #059669 0%, #10b981 100%);
    --warning-gradient: linear-gradient(135deg, #d97706 0%, #f59e0b 100%);
    --danger-gradient: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
    --info-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);

    /* Glass Effects */
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.25);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --glass-blur: blur(20px);
    --glass-blur-sm: blur(10px);
    --glass-blur-xs: blur(5px);

    /* Strength Colors */
    --strength-very-weak: #dc2626;
    --strength-weak: #ef4444;
    --strength-fair: #f59e0b;
    --strength-good: #3b82f6;
    --strength-strong: #10b981;
    --strength-very-strong: #059669;

    /* Animation */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --animation-fast: 0.2s;
    --animation-medium: 0.4s;
    --animation-slow: 0.6s;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
}

[data-theme="dark"] {
    /* Dark Theme Variables */
    --theme-bg: #0f172a;
    --theme-bg-secondary: #1e293b;
    --theme-card-bg: rgba(30, 41, 59, 0.75);
    --theme-card-secondary: rgba(30, 41, 59, 0.9);
    --theme-border: rgba(71, 85, 105, 0.4);
    --theme-border-light: rgba(71, 85, 105, 0.2);
    --theme-text: #f1f5f9;
    --theme-text-secondary: #cbd5e1;
    --theme-text-muted: #94a3b8;
    --theme-heading: #f8fafc;
    --theme-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.25), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --theme-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.35), 0 10px 10px -5px rgba(0, 0, 0, 0.2);

    /* Brand Colors - Dark Theme */
    --theme-primary: #ef4444;
    --theme-primary-rgb: 239, 68, 68;
    --theme-primary-light: rgba(239, 68, 68, 0.15);
    --theme-success: #10b981;
    --theme-success-rgb: 16, 185, 129;
    --theme-success-light: rgba(16, 185, 129, 0.15);
    --theme-warning: #f59e0b;
    --theme-warning-rgb: 245, 158, 11;
    --theme-warning-light: rgba(245, 158, 11, 0.15);
    --theme-danger: #ef4444;
    --theme-danger-rgb: 239, 68, 68;
    --theme-danger-light: rgba(239, 68, 68, 0.15);
    --theme-info: #60a5fa;
    --theme-info-rgb: 96, 165, 250;
    --theme-info-light: rgba(96, 165, 250, 0.15);

    /* Gradients - Dark Theme */
    --primary-gradient: linear-gradient(135deg, #ef4444 0%, #8b5cf6 100%);
    --success-gradient: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --warning-gradient: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
    --danger-gradient: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
    --info-gradient: linear-gradient(135deg, #60a5fa 0%, #93c5fd 100%);

    /* Glass Effects - Dark Theme */
    --glass-bg: rgba(15, 23, 42, 0.75);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

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

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    background-color: var(--theme-bg);
    color: var(--theme-text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    transition: background-color var(--animation-medium), color var(--animation-medium);
    overflow-x: hidden;
    min-height: 100vh;
}

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

.register-hero {
    position: relative;
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    background: linear-gradient(135deg, 
        rgba(var(--theme-primary-rgb), 0.05) 0%,
        transparent 50%,
        rgba(var(--theme-success-rgb), 0.05) 100%);
    overflow: hidden;
    margin-top: 0;
}

.register-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, 
            rgba(var(--theme-primary-rgb), 0.08) 0%, 
            transparent 50%),
        radial-gradient(circle at 80% 20%, 
            rgba(var(--theme-success-rgb), 0.08) 0%, 
            transparent 50%);
    z-index: -1;
}

.register-hero-content {
    position: relative;
    z-index: 2;
    animation: slideInUp 0.8s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================================
   LAYOUT & CONTAINERS
   ============================================================================ */

.section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--spacing-sm) * -0.5);
}

.col-lg-8, .col-lg-10, .col-lg-6,
.col-md-4, .col-md-6 {
    padding: 0 calc(var(--spacing-sm) * 0.5);
}

.col-lg-8 { width: 66.6667%; }
.col-lg-10 { width: 83.3333%; }
.col-lg-6 { width: 50%; }
.col-md-4 { width: 33.3333%; }
.col-md-6 { width: 50%; }

.text-center { text-align: center; }
.position-relative { position: relative; }
.z-1 { z-index: 1; }
.z-2 { z-index: 2; }
.z-3 { z-index: 3; }

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

.display-1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.02em;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.display-2 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.display-3 {
    font-size: clamp(1.75rem, 3.5vw, 3rem);
    font-weight: 700;
    line-height: 1.3;
}

.display-4 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    line-height: 1.4;
}

.display-6 {
    font-size: clamp(1.25rem, 2.5vw, 2rem);
    font-weight: 600;
    line-height: 1.4;
}

.fw-black { font-weight: 900; }
.fw-bold { font-weight: 700; }
.fw-medium { font-weight: 600; }
.fw-normal { font-weight: 400; }

.lead {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    font-weight: 400;
    line-height: 1.6;
    color: var(--theme-text-secondary);
}

.fs-3 { font-size: 1.25rem; }
.fs-4 { font-size: 1.125rem; }
.fs-5 { font-size: 1rem; }
.fs-6 { font-size: 0.875rem; }

.small {
    font-size: 0.875rem;
    line-height: 1.5;
}

.opacity-75 { opacity: 0.75; }
.opacity-50 { opacity: 0.5; }
.opacity-25 { opacity: 0.25; }

/* Gradient Text */
.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    position: relative;
}

/* ============================================================================
   GLASSMORPHISM COMPONENTS
   ============================================================================ */

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    box-shadow: var(--glass-shadow);
    padding: var(--spacing-lg);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(var(--theme-primary-rgb), 0.3) 50%,
        transparent 100%);
}

.glass-card-secondary {
    background: var(--theme-card-secondary);
    backdrop-filter: var(--glass-blur-sm);
    -webkit-backdrop-filter: var(--glass-blur-sm);
    border: 1px solid var(--theme-border-light);
    border-radius: 1rem;
    box-shadow: var(--theme-shadow);
}

.hover-lift {
    transition: transform var(--transition-bounce), box-shadow var(--transition-bounce);
}

.hover-lift:hover,
.hover-lift:focus-within {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.hover-lift:active {
    transform: translateY(-4px);
}

/* ============================================================================
   BUTTONS - ENHANCED GLASS BUTTONS
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.5;
    border-radius: 0.75rem;
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    background: transparent;
    color: var(--theme-text);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.btn:hover::before,
.btn:focus::before {
    left: 100%;
}

.btn-xl {
    padding: 1.25rem 2.5rem;
    font-size: 1.25rem;
}

.glass-button-primary {
    background: rgba(var(--theme-primary-rgb), 0.1);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
    border: 1px solid rgba(var(--theme-primary-rgb), 0.2);
    color: var(--theme-primary);
}

.glass-button-primary:hover,
.glass-button-primary:focus {
    background: rgba(var(--theme-primary-rgb), 0.2);
    border-color: rgba(var(--theme-primary-rgb), 0.3);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(var(--theme-primary-rgb), 0.15);
}

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

.glass-button-secondary {
    background: rgba(var(--theme-info-rgb), 0.1);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
    border: 1px solid rgba(var(--theme-info-rgb), 0.2);
    color: var(--theme-info);
}

.glass-button-secondary:hover,
.glass-button-secondary:focus {
    background: rgba(var(--theme-info-rgb), 0.2);
    border-color: rgba(var(--theme-info-rgb), 0.3);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(var(--theme-info-rgb), 0.15);
}

.glass-button-success {
    background: rgba(var(--theme-success-rgb), 0.1);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
    border: 1px solid rgba(var(--theme-success-rgb), 0.2);
    color: var(--theme-success);
}

.glass-button-success:hover,
.glass-button-success:focus {
    background: rgba(var(--theme-success-rgb), 0.2);
    border-color: rgba(var(--theme-success-rgb), 0.3);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(var(--theme-success-rgb), 0.15);
}

/* ============================================================================
   BADGES
   ============================================================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 0.5rem;
    gap: 0.5rem;
    transition: var(--transition-smooth);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
}

.steps-badge {
    background: rgba(var(--theme-info-rgb), 0.1);
    border: 1px solid rgba(var(--theme-info-rgb), 0.3);
    color: var(--theme-info);
}

.security-badge {
    background: rgba(var(--theme-success-rgb), 0.1);
    border: 1px solid rgba(var(--theme-success-rgb), 0.3);
    color: var(--theme-success);
}

/* ============================================================================
   ICONS
   ============================================================================ */

.icon-large {
    font-size: 4rem;
    color: var(--theme-primary);
    transition: var(--transition-smooth);
}

.icon-xlarge {
    font-size: 5rem;
    color: var(--theme-primary);
    transition: var(--transition-smooth);
}

.icon-2xlarge {
    font-size: 6rem;
    color: var(--theme-primary);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ============================================================================
   REGISTER SECTION
   ============================================================================ */

.register-section {
    position: relative;
    padding-top: 0;
}

.register-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--theme-border) 50%,
        transparent 100%);
    opacity: 0.5;
}

/* Register Card */
.register-card {
    position: relative;
    z-index: 2;
    animation: scaleIn 0.6s ease-out;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.register-header {
    margin-bottom: var(--spacing-xl);
}

.register-icon {
    font-size: 5rem;
    color: var(--theme-primary);
    margin-bottom: var(--spacing-md);
}

/* Security Warning */
.security-warning {
    border-left: 4px solid var(--theme-success);
    background: rgba(var(--theme-success-rgb), 0.05);
}

/* Registration Columns */
.register-column {
    height: 100%;
}

.column-header {
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--theme-border-light);
    margin-bottom: var(--spacing-lg);
}

.column-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    font-size: 2rem;
    background: rgba(var(--theme-primary-rgb), 0.1);
    color: var(--theme-primary);
    border: 1px solid rgba(var(--theme-primary-rgb), 0.2);
    border-radius: 1rem;
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
}

.column-icon-success {
    background: rgba(var(--theme-success-rgb), 0.1);
    color: var(--theme-success);
    border: 1px solid rgba(var(--theme-success-rgb), 0.2);
}

/* ============================================================================
   FORM CONTROLS - ENHANCED GLASS INPUTS
   ============================================================================ */

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--theme-text);
    font-size: 0.95rem;
}

.glass-input-group {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    transition: var(--transition-smooth);
    overflow: hidden;
}

.glass-input-group:focus-within {
    border-color: var(--theme-primary);
    box-shadow: 0 0 0 3px rgba(var(--theme-primary-rgb), 0.1);
    transform: translateY(-1px);
}

.input-group-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-md);
    color: var(--theme-text-muted);
    font-size: 1.25rem;
    min-width: 3rem;
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .input-group-icon {
    background: rgba(255, 255, 255, 0.05);
}

.glass-form-control {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--theme-text);
    padding: 0.875rem var(--spacing-md);
    font-size: 1rem;
    line-height: 1.5;
    outline: none;
    min-width: 0;
    width: 100%;
    font-family: inherit;
}

.glass-form-control::placeholder {
    color: var(--theme-text-muted);
    opacity: 0.7;
}

.glass-form-control:focus {
    outline: none;
    box-shadow: none;
}

.input-group-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-md);
    background: none;
    border: none;
    color: var(--theme-text-muted);
    cursor: pointer;
    font-size: 1.25rem;
    transition: var(--transition-smooth);
    min-width: 3rem;
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .input-group-btn {
    background: rgba(255, 255, 255, 0.05);
}

.input-group-btn:hover,
.input-group-btn:focus {
    color: var(--theme-primary);
    background: rgba(var(--theme-primary-rgb), 0.05);
}

.input-group-btn:focus-visible {
    outline: 2px solid var(--theme-primary);
    outline-offset: -2px;
}

/* Help Text & Security Notice */
.help-text,
.security-notice {
    border-left: 3px solid var(--theme-info);
    background: rgba(var(--theme-info-rgb), 0.05);
    padding: var(--spacing-sm);
    border-radius: 0 0.5rem 0.5rem 0;
    margin-top: var(--spacing-xs);
}

.security-notice {
    border-left-color: var(--theme-success);
    background: rgba(var(--theme-success-rgb), 0.05);
}

/* Enhanced Password Requirements */
.password-requirements {
    background: var(--theme-card-secondary);
    border: 1px solid var(--theme-border-light);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
}

.requirements-grid {
    display: grid;
    gap: 0.75rem;
}

.requirement-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: 0.5rem;
    transition: var(--transition-smooth);
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .requirement-item {
    background: rgba(255, 255, 255, 0.05);
}

.requirement-item:hover {
    background: rgba(var(--theme-primary-rgb), 0.05);
}

.requirement-item.requirement-met {
    background: rgba(var(--theme-success-rgb), 0.1);
    border: 1px solid rgba(var(--theme-success-rgb), 0.2);
}

.requirement-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    flex-shrink: 0;
    font-size: 0.875rem;
}

.requirement-text {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.requirement-status {
    font-size: 0.875rem;
    font-weight: 600;
    min-width: 1.5rem;
    text-align: center;
}

/* Password Strength Meter */
.password-strength-meter {
    margin: var(--spacing-md) 0;
}

.strength-label {
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.strength-bar {
    height: 6px;
    background: var(--theme-border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.25rem;
}

.strength-progress {
    height: 100%;
    width: 0%;
    border-radius: 3px;
    transition: width 0.4s ease, background-color 0.4s ease;
}

.strength-progress.strength-very-weak {
    background: var(--strength-very-weak);
    width: 20%;
}

.strength-progress.strength-weak {
    background: var(--strength-weak);
    width: 40%;
}

.strength-progress.strength-fair {
    background: var(--strength-fair);
    width: 60%;
}

.strength-progress.strength-good {
    background: var(--strength-good);
    width: 80%;
}

.strength-progress.strength-strong,
.strength-progress.strength-very-strong {
    background: var(--strength-strong);
    width: 100%;
}

.strength-levels {
    font-size: 0.75rem;
    display: flex;
    justify-content: space-between;
    margin-top: 0.25rem;
}

/* Password Match Status */
.match-status {
    min-height: 1.5rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

/* Password Tips */
.password-tips {
    padding-top: 0.75rem;
    border-top: 1px solid var(--theme-border-light);
    font-size: 0.875rem;
    color: var(--theme-text-secondary);
}

/* Form Validation */
.is-valid {
    border-color: var(--theme-success) !important;
}

.is-valid:focus-within {
    border-color: var(--theme-success) !important;
    box-shadow: 0 0 0 3px rgba(var(--theme-success-rgb), 0.1) !important;
}

.is-invalid {
    border-color: var(--theme-danger) !important;
}

.is-invalid:focus-within {
    border-color: var(--theme-danger) !important;
    box-shadow: 0 0 0 3px rgba(var(--theme-danger-rgb), 0.1) !important;
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--theme-danger);
    line-height: 1.4;
    padding-left: 0.5rem;
}

.was-validated .glass-form-control:invalid ~ .invalid-feedback,
.glass-form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

.field-error {
    animation: shake 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}

/* Account Type Grid */
.account-type-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.account-type-card {
    position: relative;
    cursor: pointer;
}

.account-type-radio {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.account-type-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    transition: var(--transition-smooth);
    cursor: pointer;
    text-align: center;
    height: 100%;
    min-height: 140px;
}

.account-type-card.active .account-type-label,
.account-type-card:hover .account-type-label,
.account-type-card:focus-within .account-type-label {
    border-color: var(--theme-primary);
    background: rgba(var(--theme-primary-rgb), 0.1);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(var(--theme-primary-rgb), 0.1);
}

.account-type-radio:checked + .account-type-label {
    border-color: var(--theme-primary);
    background: rgba(var(--theme-primary-rgb), 0.15);
    box-shadow: 0 8px 20px rgba(var(--theme-primary-rgb), 0.15);
}

.account-type-icon {
    font-size: 2.5rem;
    color: var(--theme-primary);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-smooth);
}

.account-type-card:hover .account-type-icon {
    transform: scale(1.1);
}

.account-type-content {
    flex: 1;
}

/* Terms Agreement */
.terms-agreement {
    background: rgba(var(--theme-primary-rgb), 0.05);
    border: 1px solid rgba(var(--theme-primary-rgb), 0.1);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
}

.form-check {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    margin-top: 0.15rem;
    background-color: var(--theme-card-bg);
    border: 1px solid var(--theme-border);
    border-radius: 0.25rem;
    cursor: pointer;
    flex-shrink: 0;
    transition: var(--transition-smooth);
    appearance: none;
    -webkit-appearance: none;
    position: relative;
}

.form-check-input:checked {
    background-color: var(--theme-primary);
    border-color: var(--theme-primary);
}

.form-check-input:checked::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0.75rem;
    height: 0.75rem;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10l3 3l6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: center;
}

.form-check-input:focus {
    border-color: var(--theme-primary);
    box-shadow: 0 0 0 3px rgba(var(--theme-primary-rgb), 0.25);
}

.form-check-label {
    cursor: pointer;
    line-height: 1.5;
    flex: 1;
    font-size: 0.95rem;
}

.form-check-label a {
    color: var(--theme-primary);
    text-decoration: none;
    font-weight: 600;
}

.form-check-label a:hover {
    text-decoration: underline;
}

/* Loading Indicator */
.loading-indicator {
    min-height: 20px;
}

.spinner-border {
    color: var(--theme-primary);
}

/* Enhanced Security Notice */
.security-notice.enhanced {
    margin-top: var(--spacing-xl);
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.security-card {
    text-align: center;
    transition: var(--transition-smooth);
}

.security-card:hover {
    transform: translateY(-8px);
    border-color: rgba(var(--theme-primary-rgb), 0.3);
}

.security-icon {
    font-size: 2.5rem;
    color: var(--theme-primary);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-smooth);
}

.security-card:hover .security-icon {
    transform: scale(1.1);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ============================================================================
   STEPS SECTION
   ============================================================================ */

.steps-section {
    background: linear-gradient(135deg, var(--theme-bg-secondary) 0%, var(--theme-bg) 100%);
    position: relative;
    overflow: hidden;
}

.steps-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--theme-border) 50%,
        transparent 100%);
    opacity: 0.5;
}

.step-card {
    transition: var(--transition-smooth);
    height: 100%;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.step-card:hover::before,
.step-card:focus-within::before {
    opacity: 0.05;
}

.step-card:hover,
.step-card:focus-within {
    transform: translateY(-12px);
    border-color: rgba(var(--theme-primary-rgb), 0.3);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.step-number {
    font-size: 2rem;
    color: var(--theme-primary);
    opacity: 0.5;
    transition: var(--transition-smooth);
    font-weight: 800;
    position: relative;
    z-index: 1;
}

.step-card:hover .step-number {
    opacity: 1;
    transform: scale(1.2);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.step-icon {
    font-size: 3.5rem;
    color: var(--theme-primary);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-smooth);
    position: relative;
    z-index: 1;
}

.step-card:hover .step-icon {
    transform: scale(1.15);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.progress-container {
    position: relative;
    margin: var(--spacing-xl) 0;
    padding: 0 var(--spacing-md);
}

.progress-line {
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 100px);
    height: 2px;
    background: var(--theme-border);
    z-index: 1;
}

.progress-line-fill {
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    height: 2px;
    background: var(--primary-gradient);
    z-index: 2;
    transition: width 0.6s ease;
    width: 0%;
}

.progress-step {
    position: relative;
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 15px;
}

.step-indicator {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--theme-card-bg);
    border: 2px solid var(--theme-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--theme-text);
    margin-bottom: 10px;
    transition: var(--transition-smooth);
    backdrop-filter: var(--glass-blur-xs);
    -webkit-backdrop-filter: var(--glass-blur-xs);
}

.step-indicator.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(var(--theme-primary-rgb), 0.3);
}

.step-indicator.completed {
    background: var(--success-gradient);
    border-color: transparent;
    color: white;
}

.step-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--theme-text-secondary);
    text-align: center;
    max-width: 100px;
    transition: var(--transition-smooth);
}

.step-indicator.active ~ .step-label {
    color: var(--theme-primary);
    font-weight: 700;
}

/* ============================================================================
   ACCESSIBILITY & INTERACTION
   ============================================================================ */

/* Focus Styles */
:focus-visible {
    outline: 3px solid var(--theme-primary);
    outline-offset: 2px;
    border-radius: 0.25rem;
}

/* Keyboard Navigation */
.keyboard-navigation .register-card:focus,
.keyboard-navigation .step-card:focus,
.keyboard-navigation .account-type-card:focus {
    outline: 3px solid var(--theme-primary);
    outline-offset: 4px;
}

.keyboard-navigation .glass-button-primary:focus,
.keyboard-navigation .glass-button-secondary:focus {
    outline: 3px solid var(--theme-primary);
    outline-offset: 2px;
}

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

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

    .hover-lift:hover,
    .step-card:hover,
    .security-card:hover,
    .account-type-card:hover .account-type-label {
        transform: none !important;
    }

    .gradient-orb {
        animation: none !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .glass-card {
        background: var(--theme-card-bg);
        border: 2px solid var(--theme-border);
    }

    .badge {
        border: 2px solid currentColor;
    }

    .glass-input-group {
        border: 2px solid var(--theme-border);
    }

    .account-type-label {
        border: 2px solid var(--theme-border);
    }

    .security-card {
        border: 2px solid var(--theme-border);
    }

    .step-card {
        border: 2px solid var(--theme-border);
    }

    :focus-visible {
        outline: 4px solid var(--theme-primary);
        outline-offset: 1px;
    }
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

/* Large Desktops (1200px+) */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

/* Tablets and Small Desktops (1024px) */
@media (max-width: 1024px) {
    .section {
        padding: var(--spacing-xl) 0;
    }

    .register-hero {
        padding: var(--spacing-xl) 0 var(--spacing-lg);
    }

    .display-2 { font-size: clamp(1.75rem, 3.5vw, 3rem); }
    .display-3 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
    .display-4 { font-size: clamp(1.25rem, 2.5vw, 2rem); }

    .glass-card {
        padding: var(--spacing-lg);
    }

    .register-header {
        margin-bottom: var(--spacing-lg);
    }

    .account-type-grid {
        grid-template-columns: 1fr;
    }

    .security-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .progress-container {
        margin: var(--spacing-lg) 0;
    }
}

/* Tablets (768px) */
@media (max-width: 768px) {
    .section {
        padding: var(--spacing-lg) 0;
    }

    .register-hero {
        padding: var(--spacing-lg) 0 var(--spacing-md);
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .section-header {
        margin-bottom: var(--spacing-lg);
    }

    .lead {
        font-size: 1.125rem;
    }

    .btn-xl {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1.125rem;
    }

    .register-column {
        margin-bottom: var(--spacing-lg);
    }

    .column-header {
        text-align: center;
    }

    .account-type-grid {
        grid-template-columns: 1fr;
    }

    .security-grid {
        grid-template-columns: 1fr;
    }

    .row {
        flex-direction: column;
    }

    .col-lg-6,
    .col-lg-8,
    .col-lg-10,
    .col-md-4,
    .col-md-6 {
        width: 100%;
    }

    .progress-line {
        width: calc(100% - 60px);
    }

    .step-indicator {
        width: 40px;
        height: 40px;
        font-size: 0.875rem;
    }

    .step-label {
        font-size: 0.75rem;
        max-width: 80px;
    }
}

/* Mobile Devices (480px) */
@media (max-width: 480px) {
    .section {
        padding: var(--spacing-md) 0;
    }

    .register-hero {
        padding: var(--spacing-lg) 0 var(--spacing-sm);
    }

    .display-2 { font-size: 1.5rem; }
    .display-3 { font-size: 1.25rem; }
    .display-4 { font-size: 1.125rem; }

    .glass-card {
        padding: var(--spacing-md);
        border-radius: 1rem;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .register-header {
        margin-bottom: var(--spacing-md);
    }

    .glass-input-group {
        flex-direction: column;
        align-items: stretch;
    }

    .input-group-icon {
        padding: var(--spacing-sm) var(--spacing-md);
        border-bottom: 1px solid var(--glass-border);
        justify-content: flex-start;
    }

    .glass-form-control {
        padding: var(--spacing-sm);
    }

    .input-group-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        border-top: 1px solid var(--glass-border);
        justify-content: flex-start;
    }

    .requirements-grid {
        grid-template-columns: 1fr;
    }

    .progress-line {
        width: calc(100% - 40px);
    }

    .step-indicator {
        width: 36px;
        height: 36px;
        font-size: 0.75rem;
    }

    .step-label {
        font-size: 0.7rem;
        max-width: 70px;
    }
}

/* Very Small Mobile Devices (320px) */
@media (max-width: 320px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .btn {
        padding: 0.875rem 1rem;
        font-size: 1rem;
    }

    .step-card,
    .security-card {
        padding: 1.5rem 1rem;
    }

    .progress-line {
        width: calc(100% - 30px);
    }

    .step-indicator {
        width: 32px;
        height: 32px;
        font-size: 0.7rem;
    }

    .step-label {
        font-size: 0.65rem;
        max-width: 60px;
    }
}

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

@media print {
    .gradient-orbs,
    .glass-card::before,
    .hover-lift:hover,
    .btn,
    .alert,
    .progress-container,
    .theme-toggle-wrapper {
        display: none !important;
    }

    .glass-card {
        background: white !important;
        border: 1px solid #ddd !important;
        box-shadow: none !important;
        break-inside: avoid;
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
    }

    .gradient-text {
        background: none !important;
        color: black !important;
        -webkit-text-fill-color: black !important;
    }

    form {
        page-break-inside: avoid;
    }

    .section {
        padding: 1rem 0 !important;
    }

    body {
        background: white !important;
        color: black !important;
        padding-top: 0 !important;
    }
}

/* ============================================================================
   SCROLLBAR STYLING
   ============================================================================ */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--theme-bg-secondary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: var(--theme-border);
    border-radius: 5px;
    border: 2px solid var(--theme-bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--theme-text-muted);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--theme-border) var(--theme-bg-secondary);
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }
.mt-6 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }
.mb-6 { margin-bottom: 3rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 2rem; }

.rounded-3 { border-radius: 0.5rem; }
.rounded-4 { border-radius: 0.75rem; }
.rounded-5 { border-radius: 1rem; }

.shadow-sm { box-shadow: var(--theme-shadow); }
.shadow-lg { box-shadow: var(--theme-shadow-lg); }

.text-primary { color: var(--theme-primary); }
.text-success { color: var(--theme-success); }
.text-danger { color: var(--theme-danger); }
.text-warning { color: var(--theme-warning); }
.text-info { color: var(--theme-info); }
.text-muted { color: var(--theme-text-muted); }

.bg-primary-light { background: var(--theme-primary-light); }
.bg-success-light { background: var(--theme-success-light); }
.bg-danger-light { background: var(--theme-danger-light); }
.bg-warning-light { background: var(--theme-warning-light); }
.bg-info-light { background: var(--theme-info-light); }

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(var(--theme-bg-rgb, 15, 23, 42), 0.9);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid var(--theme-border);
    border-top-color: var(--theme-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    margin-top: var(--spacing-md);
    color: var(--theme-text);
    font-weight: 500;
}

/* Success Animation */
.success-animation {
    display: none;
    text-align: center;
    animation: scaleIn 0.6s ease-out;
}

.success-animation.show {
    display: block;
}

.success-checkmark {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    position: relative;
}

.success-checkmark::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(var(--theme-success-rgb), 0.1);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.7;
    }
}

.success-checkmark i {
    font-size: 3rem;
    color: var(--theme-success);
    position: relative;
    z-index: 1;
}

/* Error Message */
.error-message {
    background: rgba(var(--theme-danger-rgb), 0.1);
    border: 1px solid rgba(var(--theme-danger-rgb), 0.2);
    color: var(--theme-danger);
    padding: var(--spacing-md);
    border-radius: 0.75rem;
    margin-bottom: var(--spacing-md);
    animation: slideInUp 0.4s ease-out;
}

/* Info Message */
.info-message {
    background: rgba(var(--theme-info-rgb), 0.1);
    border: 1px solid rgba(var(--theme-info-rgb), 0.2);
    color: var(--theme-info);
    padding: var(--spacing-md);
    border-radius: 0.75rem;
    margin-bottom: var(--spacing-md);
    animation: slideInUp 0.4s ease-out;
}

/* Warning Message */
.warning-message {
    background: rgba(var(--theme-warning-rgb), 0.1);
    border: 1px solid rgba(var(--theme-warning-rgb), 0.2);
    color: var(--theme-warning);
    padding: var(--spacing-md);
    border-radius: 0.75rem;
    margin-bottom: var(--spacing-md);
    animation: slideInUp 0.4s ease-out;
}