/* Maths Tutor Design System - Educational UI */

/* CSS Variables for design system */
:root {
    /* Main backgrounds */
    --background: 244 47% 96%;
    --foreground: 222.2 84% 4.9%;

    /* Card system */
    --card: 0 0% 100%;
    --card-foreground: 222.2 84% 4.9%;

    /* Brand colors - Educational theme */
    --primary: 220 90% 56%;
    --primary-foreground: 0 0% 100%;
    --primary-glow: 220 90% 70%;

    /* Student gamification colors */
    --student-primary: 280 100% 60%;
    --student-secondary: 340 100% 65%;
    --student-accent: 45 100% 60%;
    --student-success: 142 70% 50%;
    --student-bg: 244 55% 98%;

    /* Parent professional colors */
    --parent-primary: 220 90% 40%;
    --parent-secondary: 215 30% 60%;
    --parent-accent: 195 100% 45%;
    --parent-bg: 0 0% 98%;

    /* Difficulty level colors */
    --easy: 142 70% 50%;
    --medium: 45 100% 60%;
    --hard: 15 100% 60%;
    --elite: 280 100% 60%;

    /* Key Stage colors - Updated from successful Index.razor implementation */
    --ks1: 300 70% 65%; /* Pink theme */
    --ks1-bg: 327 73% 97%;
    --ks1-text: 330 81% 60%;

    --ks2: 220 90% 60%; /* Blue theme */
    --ks2-bg: 214 100% 97%;
    --ks2-text: 224 76% 48%;

    --ks3: 45 100% 55%; /* Yellow theme */
    --ks3-bg: 48 100% 96%;
    --ks3-text: 45 92% 47%;

    --ks4: 15 90% 55%; /* Orange theme */
    --ks4-bg: 220 14% 96%;
    --ks4-text: 215 25% 27%;

    /* Secondary system */
    --secondary: 220 15% 95%;
    --secondary-foreground: 222.2 47.4% 11.2%;
    --muted: 220 15% 95%;
    --muted-foreground: 215.4 16.3% 46.9%;
    --accent: 220 15% 92%;
    --accent-foreground: 222.2 47.4% 11.2%;

    /* Status colors */
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 210 40% 98%;
    --success: 142 70% 50%;
    --success-foreground: 0 0% 100%;
    --warning: 45 100% 60%;
    --warning-foreground: 222.2 84% 4.9%;

    /* Form elements */
    --border: 220 13% 91%;
    --input: 220 13% 91%;
    --ring: 220 90% 56%;

    /* Gradients - Enhanced with Key Stage themes */
    --gradient-student: linear-gradient(135deg, hsl(var(--student-primary)), hsl(var(--student-secondary)));
    --gradient-parent: linear-gradient(135deg, hsl(var(--parent-primary)), hsl(var(--parent-accent)));
    --gradient-success: linear-gradient(135deg, hsl(var(--success)), hsl(142 70% 65%));
    --gradient-celebration: linear-gradient(135deg, hsl(280 30% 94%), hsl(340 35% 91%));
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-main-bg: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
    --gradient-ks1: linear-gradient(135deg, #FCE7F3 0%, #FDF2F8 100%);
    --gradient-ks2: linear-gradient(135deg, #DBEAFE 0%, #EFF6FF 100%);
    --gradient-ks3: linear-gradient(135deg, #FEF3C7 0%, #FFFBEB 100%);
    --gradient-ks4: linear-gradient(135deg, #F3F4F6 0%, #F9FAFB 100%);

    /* Shadows - Enhanced elevation system */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 2px 0 hsl(220 13% 69% / 0.2);
    --shadow-md: 0 4px 6px -1px hsl(220 13% 69% / 0.3);
    --shadow-lg: 0 10px 15px -3px hsl(220 13% 69% / 0.4);
    --shadow-xl: 0 20px 25px -5px hsl(220 13% 69% / 0.4);
    --shadow-2xl: 0 25px 50px -12px hsl(220 13% 69% / 0.5);
    --shadow-glow: 0 0 20px hsl(var(--primary) / 0.3);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.1);
    --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.12);

    /* Radius system - Flexible scaling */
    --radius-xs: 0.25rem;
    --radius-sm: 0.5rem;
    --radius: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-3xl: 3rem;
    --radius-full: 9999px;

    /* Spacing system - 8px grid */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Typography scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    /* Line heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
}

/* Dark mode variables */
[data-theme="dark"] {
    /* Main backgrounds */
    --background: 222.2 84% 4.9%;
    --foreground: 210 40% 98%;

    /* Card system */
    --card: 222.2 47.4% 11.2%;
    --card-foreground: 210 40% 98%;

    /* Brand colors - Dark mode */
    --primary: 217.2 91.2% 59.8%;
    --primary-foreground: 222.2 84% 4.9%;
    --primary-glow: 217.2 91.2% 70%;

    /* Student colors - Dark adjusted */
    --student-primary: 280 100% 70%;
    --student-secondary: 340 100% 75%;
    --student-accent: 45 100% 70%;
    --student-success: 142 70% 60%;
    --student-bg: 222.2 47.4% 11.2%;

    /* Parent colors - Dark adjusted */
    --parent-primary: 220 90% 60%;
    --parent-secondary: 215 30% 70%;
    --parent-accent: 195 100% 65%;
    --parent-bg: 222.2 47.4% 11.2%;

    /* Secondary system */
    --secondary: 215 27.9% 16.9%;
    --secondary-foreground: 210 40% 98%;
    --muted: 215 27.9% 16.9%;
    --muted-foreground: 217.9 10.6% 64.9%;
    --accent: 215 27.9% 16.9%;
    --accent-foreground: 210 40% 98%;

    /* Form elements */
    --border: 215 27.9% 16.9%;
    --input: 215 27.9% 16.9%;
    --ring: 217.2 91.2% 59.8%;

    /* Gradients - Dark mode */
    --gradient-hero: linear-gradient(135deg, #4c1d95 0%, #581c87 100%);
    --gradient-main-bg: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --gradient-ks1: linear-gradient(135deg, #451a03 0%, #7c2d12 100%);
    --gradient-ks2: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);
    --gradient-ks3: linear-gradient(135deg, #451a03 0%, #92400e 100%);
    --gradient-ks4: linear-gradient(135deg, #374151 0%, #4b5563 100%);

    /* Shadows - Dark mode */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 20px hsl(var(--primary) / 0.5);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.4);
}

/* Enhanced Navigation Icon System with Color Preservation - Cache bust: v2025-09-01-icons-fix */
.nav-icon {
    position: relative;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(0, 0, 0, 0.8);
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    padding: 8px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-icon:hover {
    text-shadow: 0 3px 6px rgba(0, 0, 0, 0.6), 0 1px 3px rgba(0, 0, 0, 0.9);
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.1);
    border: 1px solid rgba(255, 255, 255, 0.4);
}

/* Key Stage specific icon colors and backgrounds with enhanced visibility - Cache bust: v2025-09-01-icons-fix */
.nav-icon-ks1 {
    color: #ff69b4 !important; /* Bright hot pink - highly visible against purple */
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.25), rgba(236, 72, 153, 0.1)) !important;
    border: 1px solid rgba(236, 72, 153, 0.5);
}

.nav-icon-ks1:hover {
    color: #ff1493 !important; /* Deep pink on hover */
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.4), rgba(236, 72, 153, 0.2)) !important;
    border: 1px solid rgba(236, 72, 153, 0.7);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.5);
}

.nav-icon-ks2 {
    color: #4a9eff !important; /* Bright sky blue - highly visible against purple */
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.25), rgba(74, 158, 255, 0.1)) !important;
    border: 1px solid rgba(74, 158, 255, 0.5);
}

.nav-icon-ks2:hover {
    color: #1e90ff !important; /* Dodger blue on hover */
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.4), rgba(74, 158, 255, 0.2)) !important;
    border: 1px solid rgba(74, 158, 255, 0.7);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.5);
}

.nav-icon-ks3 {
    color: #ffd700 !important; /* Bright gold - highly visible against purple */
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.25), rgba(255, 215, 0, 0.1)) !important;
    border: 1px solid rgba(255, 215, 0, 0.5);
}

.nav-icon-ks3:hover {
    color: #ffb347 !important; /* Peach on hover for warmth */
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.4), rgba(255, 215, 0, 0.2)) !important;
    border: 1px solid rgba(255, 215, 0, 0.7);
    box-shadow: 0 4px 12px rgba(255, 215, 0, 0.5);
}

.nav-icon-ks4 {
    color: #d3d3d3 !important; /* Light gray - visible against purple */
    background: linear-gradient(135deg, rgba(211, 211, 211, 0.25), rgba(211, 211, 211, 0.1)) !important;
    border: 1px solid rgba(211, 211, 211, 0.5);
}

.nav-icon-ks4:hover {
    color: #f0f0f0 !important; /* Almost white on hover */
    background: linear-gradient(135deg, rgba(211, 211, 211, 0.4), rgba(211, 211, 211, 0.2)) !important;
    border: 1px solid rgba(211, 211, 211, 0.7);
    box-shadow: 0 4px 12px rgba(211, 211, 211, 0.5);
}

/* Color Utility Classes for Navigation Icons - Legacy Support */
.text-pink-600 { color: #ec4899 !important; }
.text-blue-600 { color: #2563eb !important; }
.text-yellow-600 { color: #ca8a04 !important; }
.text-gray-600 { color: #4b5563 !important; }
.text-orange-600 { color: #ea580c !important; }
.text-purple-600 { color: #9333ea !important; }

/* Student Theme Colors */
.text-student-primary { color: hsl(var(--student-primary)) !important; }

/* Base styles */
body {
    background: hsl(var(--background));
    color: hsl(var(--foreground));
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   COMPONENT SYSTEM - BASED ON INDEX.RAZOR SUCCESS
   ======================================== */

/* Hero Section Components */
.hero-section {
    background: var(--gradient-hero);
    color: white;
    padding: var(--space-6) 0;
    margin-bottom: var(--space-6);
}

.hero-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
    line-height: var(--leading-tight);
}

.hero-subtitle {
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
    opacity: 0.9;
    line-height: var(--leading-normal);
}

.hero-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* Progress page specific hero compact styles */
.progress-hero-compact .hero-section {
    padding: var(--space-4) 0;
    margin-bottom: var(--space-4);
}

.progress-hero-compact .hero-title {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-1);
}

.progress-hero-compact .hero-subtitle {
    font-size: var(--text-base);
    margin-bottom: var(--space-3);
}

.progress-hero-compact .hero-features {
    gap: var(--space-2);
}

.progress-hero-compact .progress-motivation {
    margin-top: var(--space-2);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-lg);
}

.feature-item i {
    font-size: var(--text-2xl);
}

/* Key Stage Selection System */
.key-stage-selection-section {
    padding: var(--space-16) 0;
    background: var(--gradient-main-bg);
}

.key-stage-main-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: hsl(var(--foreground));
    margin-bottom: var(--space-4);
    text-align: center;
    line-height: 1.4;
    overflow: visible;
    padding-bottom: 0.2em;
}

.key-stage-subtitle {
    font-size: var(--text-base);
    color: hsl(var(--muted-foreground));
    max-width: 600px;
    margin: 0 auto var(--space-12);
    line-height: var(--leading-relaxed);
    text-align: center;
}

.key-stage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
    max-width: 1200px;
    margin: 0 auto;
}

/* Key Stage Cards - Core Design System */
.key-stage-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-3) var(--space-4);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.key-stage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

/* Theme-specific card backgrounds */
.ks1-card {
    background: var(--gradient-ks1);
}

.ks2-card {
    background: var(--gradient-ks2);
}

.ks3-card {
    background: var(--gradient-ks3);
}

.ks4-card {
    background: var(--gradient-ks4);
}

/* Card Content Structure */
.card-icon {
    text-align: center;
    margin-bottom: var(--space-2);
}

.card-icon i {
    font-size: 28px;
    color: hsl(var(--foreground));
}

.key-stage-card .card-title {
    font-size: var(--text-lg);
    font-weight: 700;
    color: hsl(var(--foreground));
    text-align: center;
    margin-bottom: var(--space-1);
}

.key-stage-card .card-subtitle {
    font-size: var(--text-sm);
    color: hsl(var(--muted-foreground));
    text-align: center;
    margin-bottom: var(--space-2);
}

/* Age Badge System */
.age-badge {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: 600;
    text-align: center;
    margin: 0 auto var(--space-2);
    background: rgba(255, 255, 255, 0.8);
}

.ks1-badge { color: hsl(var(--ks1-text)); }
.ks2-badge { color: hsl(var(--ks2-text)); }
.ks3-badge { color: hsl(var(--ks3-text)); }
.ks4-badge { color: hsl(var(--ks4-text)); }

/* Card Description */
.key-stage-card .card-description {
    font-size: var(--text-sm);
    color: hsl(var(--foreground) / 0.8);
    text-align: center;
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-2);
}

/* Topics Section */
.topics-section {
    flex-grow: 0;
    margin-bottom: var(--space-2);
}

/* Progress Stats Cards - Compact Version */
.progress-stats-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 140px;
    max-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.progress-stats-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.progress-stats-card .card-icon {
    margin-bottom: var(--space-2);
    font-size: var(--text-2xl);
}

.progress-stats-card .card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: hsl(var(--foreground));
    text-align: center;
    margin-bottom: var(--space-1);
}

.progress-stats-card .card-subtitle {
    font-size: var(--text-xs);
    color: hsl(var(--muted-foreground));
    text-align: center;
    margin-bottom: var(--space-2);
}

.progress-stats-card .card-description {
    font-size: var(--text-xs);
    color: hsl(var(--foreground) / 0.8);
    text-align: center;
    line-height: var(--leading-normal);
    margin-bottom: var(--space-1);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Compact age badges */
.progress-stats-card .age-badge {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    margin-bottom: var(--space-2);
}

.topics-header {
    font-size: var(--text-xs);
    font-weight: 600;
    color: hsl(var(--muted-foreground));
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
    text-transform: uppercase;
}

.topics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2);
    align-items: center;
}

.topic-tag {
    font-size: var(--text-xs);
    color: hsl(var(--foreground) / 0.9);
    font-weight: 500;
}

.more-link {
    font-size: var(--text-xs);
    color: hsl(var(--muted-foreground));
    justify-self: end;
    grid-column: 2;
}

/* Action Buttons */
.start-learning-btn {
    background: #E879F9;
    color: white;
    border: none;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: all 0.2s ease;
    margin-top: auto;
    cursor: pointer;
}

.start-learning-btn:hover {
    background: #D946EF;
    transform: translateY(-1px);
}

/* Assessment Section */
.assessment-section {
    margin-top: var(--space-16);
    text-align: center;
}

.assessment-card {
    background: white;
    padding: var(--space-10);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    margin: 0 auto;
}

.assessment-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: hsl(var(--foreground));
    margin-bottom: var(--space-3);
}

.assessment-subtitle {
    font-size: var(--text-base);
    color: hsl(var(--muted-foreground));
    margin-bottom: var(--space-6);
    line-height: var(--leading-relaxed);
}

.assessment-btn {
    background: white;
    color: #3B82F6;
    border: 2px solid #3B82F6;
    padding: var(--space-3) var(--space-8);
    border-radius: var(--radius-full);
    font-size: var(--text-base);
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
}

.assessment-btn:hover {
    background: #3B82F6;
    color: white;
}

/* Component Base Classes */
.card {
    background: hsl(var(--card));
    color: hsl(var(--card-foreground));
    border-radius: var(--radius);
    border: 1px solid hsl(var(--border));
    box-shadow: var(--shadow-sm);
}

.card-header {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1;
}

.card-description {
    font-size: 0.875rem;
    color: hsl(var(--muted-foreground));
}

.card-content {
    padding: 1.5rem;
    padding-top: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    padding: 0.5rem 1rem;
    text-decoration: none;
}

.btn:hover {
    transform: scale(1.05);
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background: hsl(var(--primary));
    color: hsl(var(--primary-foreground));
}

.btn-primary:hover {
    background: hsl(var(--primary) / 0.9);
}

.btn-playful {
    background: var(--gradient-student);
    color: white;
    animation: pulse-gentle 2s infinite;
}

.btn-rounded {
    border-radius: var(--radius-full);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.btn-xs {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
}

.btn-success {
    background: hsl(var(--success));
    color: hsl(var(--success-foreground));
}

.btn-magic {
    background: linear-gradient(135deg, hsl(var(--student-primary)), hsl(var(--student-secondary)));
    color: white;
    transition: all 0.3s;
}

.btn-magic:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px) scale(1.05);
    animation: wiggle 0.5s ease-in-out;
}

.input {
    display: flex;
    height: 2.5rem;
    width: 100%;
    border-radius: var(--radius);
    border: 1px solid hsl(var(--input));
    background: transparent;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.input:focus {
    outline: none;
    border-color: hsl(var(--ring));
    box-shadow: 0 0 0 2px hsl(var(--ring) / 0.2);
}

.badge {
    display: inline-flex;
    align-items: center;
    border-radius: calc(var(--radius) - 2px);
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.2s;
}

.badge-default {
    background: hsl(var(--secondary));
    color: hsl(var(--secondary-foreground));
}

.badge-success {
    background: hsl(var(--success));
    color: hsl(var(--success-foreground));
}

/* ========================================
   UTILITY CLASSES - EXTRACTED FROM SUCCESS
   ======================================== */

/* Hover Effects */
.hover-lift:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    transition: all 0.2s;
}

.hover-lift-sm:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease;
}

.hover-lift-lg:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hover-glow:hover {
    box-shadow: var(--shadow-glow);
    transition: all 0.3s;
}

.hover-scale:hover {
    transform: scale(1.02);
    transition: all 0.2s ease;
}

/* Background Utilities */
.bg-main {
    background: var(--gradient-main-bg);
}

.bg-hero {
    background: var(--gradient-hero);
}

.bg-ks1 {
    background: var(--gradient-ks1);
}

.bg-ks2 {
    background: var(--gradient-ks2);
}

.bg-ks3 {
    background: var(--gradient-ks3);
}

.bg-ks4 {
    background: var(--gradient-ks4);
}

.bg-glass {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Border Radius Utilities */
.rounded-xs { border-radius: var(--radius-xs); }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-3xl { border-radius: var(--radius-3xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadow Utilities */
.shadow-xs { box-shadow: var(--shadow-xs); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-md); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-2xl { box-shadow: var(--shadow-2xl); }
.shadow-glow { box-shadow: var(--shadow-glow); }
.shadow-hover { box-shadow: var(--shadow-hover); }

/* Typography Utilities */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }

.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }

.leading-tight { line-height: var(--leading-tight); }
.leading-snug { line-height: var(--leading-snug); }
.leading-normal { line-height: var(--leading-normal); }
.leading-relaxed { line-height: var(--leading-relaxed); }
.leading-loose { line-height: var(--leading-loose); }

/* Spacing Utilities */
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-10 { padding: var(--space-10); }
.p-12 { padding: var(--space-12); }
.p-16 { padding: var(--space-16); }

.py-1 { padding-top: var(--space-1); padding-bottom: var(--space-1); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }

.px-1 { padding-left: var(--space-1); padding-right: var(--space-1); }
.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }

.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-16 { margin-top: var(--space-16); }

/* Gap Utilities */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.text-gradient-student {
    background: var(--gradient-student);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-student {
    background: var(--gradient-student);
}

.bg-gradient-parent {
    background: var(--gradient-parent);
}

.celebration-bg {
    background: var(--gradient-celebration);
}

.glassmorphism {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Layout Classes */
.min-h-screen {
    min-height: 100vh;
}

.flex {
    display: flex;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

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

.w-full {
    width: 100%;
}

.max-w-md {
    max-width: 28rem;
}

.p-4 {
    padding: 1rem;
}

.p-6 {
    padding: 1.5rem;
}

.mb-3 {
    margin-bottom: 0.75rem;
}

.space-y-4 > * + * {
    margin-top: 1rem;
}

.space-y-8 > * + * {
    margin-top: 2rem;
}

.grid {
    display: grid;
}

.grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.gap-4 {
    gap: 1rem;
}

/* Animations */
@keyframes bounce-gentle {
    0%, 100% {
        transform: translateY(0);
        animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
    }
    50% {
        transform: translateY(-4px);
        animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
    }
}

@keyframes pulse-gentle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

@keyframes wiggle {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-1deg); }
    75% { transform: rotate(1deg); }
}

@keyframes scale-in {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Enhanced Achievement Celebration Animations */
@keyframes achievement-entrance {
    0% {
        transform: scale(0.1) rotate(180deg);
        opacity: 0;
    }
    40% {
        transform: scale(1.15) rotate(15deg);
        opacity: 0.9;
    }
    70% {
        transform: scale(0.95) rotate(-5deg);
        opacity: 1;
    }
    100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
}

@keyframes particle-burst {
    0% {
        transform: scale(0) rotate(0deg) translateX(0);
        opacity: 1;
    }
    50% {
        transform: scale(1.2) rotate(180deg) translateX(var(--burst-distance));
        opacity: 0.8;
    }
    100% {
        transform: scale(0.8) rotate(360deg) translateX(var(--burst-distance-final));
        opacity: 0;
    }
}

@keyframes sparkle-float {
    0% {
        transform: translateY(0) rotate(0deg) scale(0);
        opacity: 0;
    }
    20% {
        transform: translateY(-10px) rotate(90deg) scale(1);
        opacity: 1;
    }
    80% {
        transform: translateY(-50px) rotate(270deg) scale(1);
        opacity: 0.8;
    }
    100% {
        transform: translateY(-80px) rotate(360deg) scale(0);
        opacity: 0;
    }
}

@keyframes confetti-fall {
    0% {
        transform: translateY(-100px) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(400px) rotate(720deg);
        opacity: 0;
    }
}

@keyframes shimmer-sweep {
    0% {
        transform: translateX(-100%);
        opacity: 0;
    }
    50% {
        opacity: 0.6;
    }
    100% {
        transform: translateX(100%);
        opacity: 0;
    }
}

@keyframes achievement-glow-pulse {
    0%, 100% {
        box-shadow: 0 0 20px hsl(var(--warning) / 0.4), 0 0 40px hsl(var(--student-primary) / 0.3);
    }
    50% {
        box-shadow: 0 0 40px hsl(var(--warning) / 0.8), 0 0 80px hsl(var(--student-primary) / 0.6);
    }
}

@keyframes achievement-icon-celebration {
    0% {
        transform: scale(1) rotate(0deg);
    }
    25% {
        transform: scale(1.3) rotate(15deg);
    }
    50% {
        transform: scale(1.1) rotate(-10deg);
    }
    75% {
        transform: scale(1.2) rotate(5deg);
    }
    100% {
        transform: scale(1) rotate(0deg);
    }
}

.animate-bounce-gentle {
    animation: bounce-gentle 2s infinite;
}

.animate-pulse-gentle {
    animation: pulse-gentle 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.animate-wiggle {
    animation: wiggle 0.5s ease-in-out;
}

.animate-scale-in {
    animation: scale-in 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Enhanced Achievement Celebration Classes */
.animate-achievement-entrance {
    animation: achievement-entrance 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity;
    transform-style: preserve-3d;
}

.animate-particle-burst {
    animation: particle-burst 1.5s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity;
    transform-style: preserve-3d;
    backface-visibility: hidden;
}

.animate-sparkle-float {
    animation: sparkle-float 2s cubic-bezier(0.16, 1, 0.3, 1) infinite;
    will-change: transform, opacity;
    transform-style: preserve-3d;
    backface-visibility: hidden;
}

.animate-confetti-fall {
    animation: confetti-fall 3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: transform, opacity;
    transform-style: preserve-3d;
    backface-visibility: hidden;
}

.animate-shimmer-sweep {
    animation: shimmer-sweep 1.5s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity;
}

.animate-achievement-glow-pulse {
    animation: achievement-glow-pulse 2s ease-in-out infinite;
    will-change: box-shadow;
}

.animate-achievement-icon-celebration {
    animation: achievement-icon-celebration 1s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform;
    transform-style: preserve-3d;
}

/* Bulletproof Modal Overlay with Enhanced Cache-Resistant Centering */
.modal-overlay-bulletproof {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 99999 !important;
    /* Primary centering method: Flexbox */
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    background-color: rgba(0, 0, 0, 0.6) !important;
    backdrop-filter: blur(2px);
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
    /* Ensure proper viewport units work on mobile */
    min-height: 100vh !important;
    min-width: 100vw !important;
    /* Fallback for older browsers or cache issues */
    text-align: center !important;
}

/* Ensure centering works even with partial CSS loading */
.modal-overlay-bulletproof::before {
    content: '' !important;
    display: inline-block !important;
    vertical-align: middle !important;
    height: 100vh !important;
    width: 0 !important;
}

.modal-content-bulletproof {
    position: relative !important;
    z-index: 100000 !important;
    max-width: 90vw !important;
    max-height: 90vh !important;
    /* Primary centering: Auto margins in flex container */
    margin: auto !important;
    display: inline-block !important;
    vertical-align: middle !important;
    text-align: left !important;
    box-sizing: border-box !important;
    /* Ensure visibility */
    opacity: 1 !important;
    visibility: visible !important;
}

/* Auto-dismiss countdown indicator */
.countdown-indicator {
    position: absolute;
    bottom: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    padding: 8px 12px;
    font-size: 12px;
    font-weight: 600;
    color: #374151;
    display: flex;
    align-items: center;
    gap: 6px;
    backdrop-filter: blur(4px);
    animation: countdown-pulse 1s ease-in-out infinite;
}

@keyframes countdown-pulse {
    0%, 100% { opacity: 0.8; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.05); }
}

.countdown-bar {
    width: 40px;
    height: 4px;
    background: #e5e7eb;
    border-radius: 2px;
    overflow: hidden;
}

.countdown-progress {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #f59e0b 50%, #ef4444 100%);
    border-radius: 2px;
    transition: width 0.1s linear;
}

/* ========================================
   NAVIGATION SYSTEM
   ======================================== */

/* Page Layout */
.page {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main {
    flex: 1;
}

.content {
    padding-top: 4.6rem; /* 3.5rem for fixed header height + 1.1rem original padding */
}

/* Sidebar Navigation */
.sidebar {
    background: var(--gradient-student);
    width: 280px;
    min-height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    overflow-y: auto;
    transition: width 0.3s ease, transform 0.3s ease;
    box-sizing: border-box;
}

/* Collapsed Sidebar State */
.sidebar.collapsed {
    width: 72px !important;
    transition: width 0.3s ease;
}

/* Collapsed sidebar navigation styling */
.sidebar.collapsed .nav-link {
    justify-content: center !important;
    padding: 0.75rem !important;
    min-height: 48px;
    width: 48px;
    margin: 0 auto 0.5rem;
    border-radius: 0.5rem;
}

.sidebar.collapsed .nav-link i {
    font-size: 1.2rem;
}

/* Enhanced collapsed sidebar icon styling - Cache bust: v2025-09-01-icons-fix */
.sidebar.collapsed .nav-icon {
    width: 36px !important;
    height: 36px !important;
    padding: 10px !important;
    font-size: 1.2rem !important;
}

.sidebar.collapsed .nav-icon-ks1,
.sidebar.collapsed .nav-icon-ks2,
.sidebar.collapsed .nav-icon-ks3,
.sidebar.collapsed .nav-icon-ks4 {
    border-width: 2px;
}

.sidebar.collapsed .nav-icon-ks1:hover,
.sidebar.collapsed .nav-icon-ks2:hover,
.sidebar.collapsed .nav-icon-ks3:hover,
.sidebar.collapsed .nav-icon-ks4:hover {
    transform: scale(1.15);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

/* Hide text content in collapsed state */
.sidebar.collapsed .nav-link span {
    display: none;
}

.sidebar.collapsed .badge {
    display: none;
}

/* Hide section headers in collapsed state */
.sidebar.collapsed h6 {
    display: none;
}

/* Hide horizontal rules in collapsed state */
.sidebar.collapsed hr {
    display: none;
}

/* Adjust navigation padding in collapsed state */
.sidebar.collapsed .flex-column {
    padding: 0.75rem 0.5rem;
}

/* Tooltip styling for collapsed navigation */
.sidebar.collapsed .nav-link[title]:hover::after {
    content: attr(title);
    position: absolute;
    left: calc(100% + 10px);
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    white-space: nowrap;
    z-index: 1001;
    pointer-events: none;
    opacity: 0;
    animation: tooltip-fade-in 0.2s ease-out forwards;
}

.sidebar.collapsed .nav-link[title]:hover::before {
    content: '';
    position: absolute;
    left: calc(100% + 5px);
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 5px 5px 5px 0;
    border-color: transparent rgba(0, 0, 0, 0.9) transparent transparent;
    z-index: 1001;
    pointer-events: none;
    opacity: 0;
    animation: tooltip-fade-in 0.2s ease-out forwards;
}

@keyframes tooltip-fade-in {
    0% {
        opacity: 0;
        transform: translateY(-50%) translateX(-5px);
    }
    100% {
        opacity: 1;
        transform: translateY(-50%) translateX(0);
    }
}

/* Navigation Menu Styles */
.top-row {
    height: 3.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

/* Optimized collapsed sidebar header layout - Cache bust: v2024-08-31-v2 */
.sidebar .top-row .container-fluid {
    min-height: 3.5rem;
    flex-wrap: nowrap !important;
}

.sidebar .navbar-brand {
    white-space: nowrap;
    overflow: hidden;
    transition: all 0.3s ease;
}

/* Collapsed state specific styling */
.sidebar.collapsed .top-row {
    padding-left: 0.25rem !important;
    padding-right: 0.25rem !important;
}

.sidebar.collapsed .container-fluid {
    padding: 0 !important;
    justify-content: center !important;
}

/* Ensure buttons in collapsed state are properly sized */
.sidebar.collapsed .btn {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

.navbar-brand {
    font-size: var(--text-xl);
    font-weight: 700;
    text-decoration: none !important;
}

.navbar-brand:hover {
    transform: scale(1.02);
    transition: transform 0.2s ease;
}

/* Navigation Links */
.nav-scrollable {
    height: calc(100vh - 3.5rem);
    overflow-y: auto;
}

.nav-link {
    color: white !important;
    text-decoration: none;
    border-radius: var(--radius);
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
    border-color: rgba(255, 255, 255, 0.2);
}

.nav-link.active {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-md);
}

.nav-link i {
    font-size: 1.1rem;
    opacity: 0.9;
}

.nav-link:hover i {
    opacity: 1;
}

/* Navigation Sections */
.nav-item {
    margin-bottom: 0;
}

.nav-scrollable hr {
    border-color: rgba(255, 255, 255, 0.2);
    margin: var(--space-4) 0;
}

.nav-scrollable h6 {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* Badge Styles in Navigation */
.nav-link .badge {
    font-size: 0.65rem;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
}

/* Mobile Navigation */
.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler-icon {
    background-image: none;
    width: 1.2rem;
    height: 1.2rem;
    position: relative;
}

.navbar-toggler-icon::before {
    content: "☰";
    color: white;
    font-size: 1.2rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Main Content Area Adjustment */
main {
    margin-left: 280px;
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

/* Adjust main content when sidebar is collapsed - Removed as we handle this via JavaScript */
/* The JavaScript now directly sets main.style.marginLeft for smoother transitions */

/* Top Navigation Bar in Main Content - Cache bust: v2024-08-31 */
main .top-row {
    height: 3.5rem;
    background: var(--gradient-hero);
    color: white;
    padding: 0 var(--space-4);
    box-shadow: var(--shadow-sm);
    border: none;
    /* Fixed positioning to keep the top bar visible during scroll
       on all pages. This ensures it stays at the top of the viewport. */
    position: fixed;
    top: 0;
    left: 280px;
    right: 0;
    z-index: 1020; /* above content/cards, below modals */
    transition: left 0.3s ease;
}

main .top-row a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

main .top-row a:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

/* Responsive Navigation */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 100%;
    }

    .sidebar.show {
        transform: translateX(0);
    }

    main {
        margin-left: 0;
    }

    /* Mobile top bar positioning - full width when sidebar is hidden */
    main .top-row {
        left: 0 !important;
        right: 0;
    }
}

.nav-scrollable.collapse:not(.show) {
    display: none;
}

.nav-scrollable:not(.collapse) {
    display: block;
}
}

@media (min-width: 769px) {
    .navbar-toggler {
        display: none;
    }

    .nav-scrollable {
        display: block !important;
    }
}

/* Color Utilities for Navigation Icons */
.text-pink-600 { color: #E879F9; }
.text-blue-600 { color: #3B82F6; }
.text-yellow-600 { color: #EAB308; }
.text-gray-600 { color: #6B7280; }

/* Original Blazor styles for compatibility */

#blazor-error-ui {
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: 0.75rem;
    top: 0.5rem;
}

/* ========================================
   MOBILE HORIZONTAL OVERFLOW FIX - Cache bust: v2025-09-01-overflow-fix
   ======================================== */

/* Prevent any horizontal overflow on all screen sizes */
body, html {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

/* Fix container-fluid on mobile to prevent overflow */
@media (max-width: 768px) {
    .container-fluid {
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
        max-width: 100vw !important;
        overflow-x: hidden !important;
    }

    /* Prevent Bootstrap rows from causing horizontal overflow */
    .row {
        margin-left: 0 !important;
        margin-right: 0 !important;
        max-width: 100% !important;
    }

    .row > * {
        padding-left: 0.375rem !important;
        padding-right: 0.375rem !important;
    }

    /* Ensure all content containers respect viewport width */
    .content {
        max-width: 100vw !important;
        overflow-x: hidden !important;
        box-sizing: border-box !important;
    }

    /* Fix any cards or components that might overflow */
    .hero-section,
    .key-stage-card,
    .assessment-card,
    .mobile-card {
        max-width: 100% !important;
        box-sizing: border-box !important;
    }

    /* Prevent fixed width elements from causing overflow */
    * {
        max-width: 100% !important;
        box-sizing: border-box !important;
    }

    /* Exception for very small elements */
    i,
    .btn,
    .badge,
    .nav-icon,
    input[type="button"],
    button {
        max-width: none !important;
    }
}

/* Fix main layout overflow on mobile */
@media (max-width: 768px) {
    main {
        width: 100vw !important;
        max-width: 100vw !important;
        margin-left: 0 !important;
        overflow-x: hidden !important;
        padding: 0 !important;
    }

    /* Fix top row to prevent overflow */
    main .top-row {
        width: 100% !important;
        max-width: 100vw !important;
        left: 0 !important;
        right: 0 !important;
        margin: 0 !important;
        padding-left: 0.5rem !important;
        padding-right: 0.5rem !important;
        box-sizing: border-box !important;
    }

    /* Sidebar completely hidden on mobile */
    .sidebar {
        transform: translateX(-100%) !important;
        width: 100vw !important;
        z-index: 9999 !important;
    }

    .sidebar.show {
        transform: translateX(0) !important;
    }
}

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

/* Key Stage Grid Responsiveness */
@media (max-width: 1024px) {
    .key-stage-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
}

@media (max-width: 640px) {
    .key-stage-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .key-stage-main-title {
        font-size: var(--text-3xl);
    }

    .key-stage-card {
        min-height: auto;
        padding: var(--space-3) var(--space-3);
    }

    .assessment-card {
        padding: var(--space-6) var(--space-5);
    }

    .hero-title {
        font-size: var(--text-4xl);
    }

    .hero-features {
        margin-top: var(--space-8);
    }

    .feature-item {
        justify-content: center;
    }
}

/* Standard responsive utilities */
@media (min-width: 768px) {
    .md\\:flex-row {
        flex-direction: row;
    }

    .md\\:items-center {
        align-items: center;
    }

    .md\\:p-8 {
        padding: 2rem;
    }

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

    .md\\:grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .lg\\:col-span-2 {
        grid-column: span 2 / span 2;
    }

    .lg\\:grid-cols-3 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .lg\\:grid-cols-4 {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .lg\\:p-8 {
        padding: var(--space-8);
    }
}

/* ========================================
   DESIGN SYSTEM DOCUMENTATION
   ======================================== */

/*
  MATHS TUTOR DESIGN SYSTEM
  Based on successful Index.razor Key Stage selection implementation
  
  COLOR SYSTEM:
  - Key Stage themes with background gradients
  - Consistent shadow and hover effects
  - Professional yet playful educational aesthetic
  
  COMPONENT PATTERNS:
  1. Hero sections with gradient backgrounds
  2. Card grids with theme-specific styling
  3. Hover effects with subtle transforms
  4. Button system with multiple variants
  5. Responsive grid layouts
  
  USAGE EXAMPLES:
  
  Hero Section:
  <div class="hero-section">
    <h1 class="hero-title">Page Title</h1>
    <p class="hero-subtitle">Description text</p>
  </div>
  
  Key Stage Cards:
  <div class="key-stage-grid">
    <div class="key-stage-card ks1-card hover-lift-lg">
      <div class="card-icon"><i class="bi bi-book"></i></div>
      <h3 class="card-title">Title</h3>
      <p class="card-subtitle">Subtitle</p>
      <div class="age-badge ks1-badge">Ages 5-7</div>
      <p class="card-description">Description text</p>
      <button class="start-learning-btn">Action</button>
    </div>
  </div>
  
  Assessment Cards:
  <div class="assessment-section">
    <div class="assessment-card">
      <h4 class="assessment-title">Title</h4>
      <p class="assessment-subtitle">Description</p>
      <button class="assessment-btn">Action</button>
    </div>
  </div>
  
  SPACING SYSTEM:
  Uses 8px base unit - space-1 (4px), space-2 (8px), space-4 (16px), etc.
  
  TYPOGRAPHY SCALE:
  text-xs to text-5xl with corresponding line-heights
  
  RESPONSIVE BREAKPOINTS:
  - Mobile first approach
  - 640px: Mobile to tablet
  - 768px: Tablet to desktop
  - 1024px: Desktop to large screens
  
  ANIMATION PRINCIPLES:
  - Subtle hover effects (2-4px transforms)
  - Smooth transitions (0.2-0.3s)
  - Cubic-bezier easing for natural feel
  - Never overwhelm the educational content
*/

/* ========================================
   ENHANCED PROGRESS CARD STYLES - Cache bust: v2025-09-01
   ======================================== */

/* Enhanced Assessment Cards with beautiful styling */
.assessment-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: var(--space-10);
    border-radius: 24px;
    box-shadow:
            0 4px 6px -1px rgba(0, 0, 0, 0.1),
            0 2px 4px -1px rgba(0, 0, 0, 0.06),
            0 0 0 1px rgba(0, 0, 0, 0.02);
    max-width: 100%;
    margin: 0 auto var(--space-6) auto;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}


.assessment-card:hover {
    transform: translateY(-2px);
    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(59, 130, 246, 0.2);
}

/* Enhanced Key Stage Cards with modern glassmorphism */
.key-stage-card.bg-ks1,
.key-stage-card.bg-ks2,
.key-stage-card.bg-ks3,
.key-stage-card.bg-ks4 {
    background: white;
    position: relative;
    overflow: hidden;
    border: 1px solid transparent;
    backdrop-filter: blur(10px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.key-stage-card.bg-ks1::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
    opacity: 1;
    transition: opacity 0.3s ease;
}

.key-stage-card.bg-ks2::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(99, 102, 241, 0.1) 100%);
    opacity: 1;
    transition: opacity 0.3s ease;
}

.key-stage-card.bg-ks3::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(251, 146, 60, 0.1) 0%, rgba(245, 158, 11, 0.1) 100%);
    opacity: 1;
    transition: opacity 0.3s ease;
}

.key-stage-card.bg-ks4::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(107, 114, 128, 0.1) 0%, rgba(156, 163, 175, 0.1) 100%);
    opacity: 1;
    transition: opacity 0.3s ease;
}

.key-stage-card:hover::before {
    opacity: 0.2;
}

.key-stage-card > * {
    position: relative;
    z-index: 1;
}

/* Elevated hover effect for cards */
.key-stage-card.hover-lift-lg:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow:
            0 25px 50px -12px rgba(0, 0, 0, 0.25),
            0 0 0 1px rgba(59, 130, 246, 0.1);
}

/* Beautiful gradient borders on hover */
.key-stage-card.bg-ks1:hover {
    border-image: linear-gradient(135deg, #ec4899, #a855f7) 1;
}

.key-stage-card.bg-ks2:hover {
    border-image: linear-gradient(135deg, #3b82f6, #6366f1) 1;
}

.key-stage-card.bg-ks3:hover {
    border-image: linear-gradient(135deg, #fb923c, #f59e0b) 1;
}

.key-stage-card.bg-ks4:hover {
    border-image: linear-gradient(135deg, #6b7280, #9ca3af) 1;
}

/* Enhanced card icons with animation */
.key-stage-card .card-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.5) 100%);
    backdrop-filter: blur(10px);
    box-shadow:
            0 4px 6px -1px rgba(0, 0, 0, 0.1),
            inset 0 0 0 1px rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.key-stage-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow:
            0 10px 15px -3px rgba(0, 0, 0, 0.1),
            inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

.key-stage-card .card-icon i {
    font-size: 28px;
    transition: transform 0.3s ease;
}

.key-stage-card:hover .card-icon i {
    transform: scale(1.1);
}

/* Enhanced badges with glassmorphism */
.age-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.025em;
    margin: var(--space-3) 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 100%);
    backdrop-filter: blur(10px);
    box-shadow:
            0 2px 4px -1px rgba(0, 0, 0, 0.1),
            inset 0 0 0 1px rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.age-badge.ks1-badge {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.2) 0%, rgba(168, 85, 247, 0.2) 100%);
    color: #a855f7;
}

.age-badge.ks2-badge {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(99, 102, 241, 0.2) 100%);
    color: #3b82f6;
}

.age-badge.ks3-badge {
    background: linear-gradient(135deg, rgba(251, 146, 60, 0.2) 0%, rgba(245, 158, 11, 0.2) 100%);
    color: #f59e0b;
}

.age-badge.ks4-badge {
    background: linear-gradient(135deg, rgba(107, 114, 128, 0.2) 0%, rgba(156, 163, 175, 0.2) 100%);
    color: #6b7280;
}

/* Animated shimmer effect */
@keyframes shimmer {
    0% {
        background-position: -100% 0;
    }
    100% {
        background-position: 100% 0;
    }
}

/* Enhanced progress stats cards */
.progress-stat {
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    transition: all 0.3s ease;
}

.progress-stat:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
}

/* Card content animations */
.card-title {
    animation: fadeInUp 0.6s ease-out;
}

.card-subtitle {
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.card-description {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Enhanced button within cards */
.key-stage-card .start-learning-btn {
    margin-top: auto;
    background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    box-shadow:
            0 4px 6px -1px rgba(59, 130, 246, 0.3),
            inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.key-stage-card .start-learning-btn:hover {
    transform: translateY(-2px);
    box-shadow:
            0 10px 15px -3px rgba(59, 130, 246, 0.4),
            inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* Pulse animation for important stats */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.level-trophy-glow {
    animation: pulse 2s ease-in-out infinite;
}

.lessons-book-flip {
    animation: pulse 2.5s ease-in-out infinite;
}

.streak-fire-dance {
    animation: pulse 1.5s ease-in-out infinite;
}

.score-graph-rise {
    animation: pulse 3s ease-in-out infinite;
}

/* Recently completed section enhancement */
.assessment-card h4 {
    position: relative;
    padding-bottom: var(--space-3);
    margin-bottom: var(--space-4);
}

.assessment-card h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #a855f7);
    border-radius: 2px;
}

/* Glass morphism for recent activity items */
.assessment-card .d-flex.hover-lift-sm {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.5) 0%, rgba(255, 255, 255, 0.3) 100%);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.assessment-card .d-flex.hover-lift-sm:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0.5) 100%);
    transform: translateX(4px);
}

/* Align back buttons with hero container */
.hero-back-container {
    display: flex;
    justify-content: flex-start;
}

.hero-back-container .btn {
    margin: 0;
}

/* Mobile Top Bar Optimization - Cache bust: v2025-09-01-mobile-topbar */
@media (max-width: 480px) {
    /* Extra small screens - icon-only navigation */
    .top-row {
        padding-left: 0.5rem !important;
        padding-right: 0.5rem !important;
        height: 3rem !important; /* Slightly reduce height on very small screens */
    }

    .top-row .fs-5 {
        font-size: 0.9rem !important;
    }

    .top-row .fs-6 {
        font-size: 0.85rem !important;
    }

    /* Tighter spacing for very small screens */
    .top-row .gap-1 {
        gap: 0.125rem !important;
    }

    /* Ensure navigation links have minimal padding */
    .top-row a {
        padding: 0.25rem 0.4rem !important;
        font-size: 0.85rem;
    }

    /* Make brand text slightly smaller */
    .top-row .fw-semibold {
        font-weight: 500 !important;
    }
}

@media (min-width: 481px) and (max-width: 576px) {
    /* Small screens - show text but keep compact */
    .top-row {
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
    }

    .top-row a {
        padding: 0.4rem 0.6rem !important;
        font-size: 0.9rem;
    }
}

/* Ultra-Mobile Top Bar Optimization - Cache bust: v2025-09-01-ultra-mobile */
@media (max-width: 375px) {
    /* Ultra-compact top bar for smallest devices (iPhone SE, small Android) */
    .top-row {
        padding-left: 0.25rem !important;
        padding-right: 0.25rem !important;
        height: 2.5rem !important; /* Reduce height for more content space */
    }

    /* Eliminate ALL gaps between elements */
    .top-row .gap-1 {
        gap: 0 !important;
    }

    /* Ultra-compact navigation links */
    .top-row a {
        padding: 0.2rem 0.3rem !important;
        font-size: 0.75rem !important;
        margin: 0 !important;
    }

    /* Smaller icons for ultra-small screens */
    .top-row .bi {
        font-size: 0.875rem !important;
        margin-right: 0 !important;
    }

    /* Compress brand section significantly */
    .top-row .fs-5 {
        font-size: 0.8rem !important;
    }
    .top-row .fs-6 {
        font-size: 0.75rem !important;
    }

    /* Ensure brand and nav sections fit within viewport */
    .top-row .d-flex {
        min-width: 0;
        flex-shrink: 1;
    }

    /* Force viewport compliance */
    .page, main, .top-row {
        max-width: 100vw !important;
        overflow-x: hidden !important;
    }

    /* Ultimate safety net - nothing can exceed viewport */
    .top-row * {
        max-width: 100vw !important;
        white-space: nowrap;
    }
}

@media (min-width: 376px) and (max-width: 480px) {
    /* Enhanced mobile breakpoint for slightly larger small screens */
    .top-row {
        padding-left: 0.375rem !important;
        padding-right: 0.375rem !important;
        height: 2.75rem !important;
    }

    .top-row a {
        padding: 0.25rem 0.35rem !important;
        font-size: 0.8rem !important;
    }

    .top-row .bi {
        font-size: 0.9rem !important;
    }
}

/* Enhanced Bootstrap responsive utilities for top bar */
@media (min-width: 768px) {
    /* Restore full spacing on medium screens and up */
    .fs-md-4 { font-size: 1.5rem !important; }
    .fs-md-5 { font-size: 1.25rem !important; }
    .gap-md-2 { gap: 0.5rem !important; }
    .gap-md-3 { gap: 1rem !important; }
}

/* CRITICAL: Additional overflow prevention for all viewport sizes */
* {
    box-sizing: border-box;
}

.page {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
}

/* Ensure Bootstrap container-fluid doesn't cause overflow */
.container-fluid {
    width: 100%;
    max-width: 100%;
    padding-left: 15px;
    padding-right: 15px;
}

/* Prevent any elements from exceeding viewport width */
@media (max-width: 768px) {
    .d-flex {
        flex-wrap: wrap;
    }

    /* Specific fixes for navigation elements that might overflow */
    .top-row .d-flex {
        flex-wrap: nowrap !important;
    }

    .top-row a {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}