/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #374151;
}

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

.bg-gradient {
    background: linear-gradient(135deg, #faf5ff 0%, #eff6ff 50%, #fdf2f8 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header-title-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.icon-container {
    padding: 0.75rem;
    background: linear-gradient(135deg, #8b5cf6, #3b82f6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon {
    width: 2rem;
    height: 2rem;
    color: white;
}

.main-title {
    font-size: 2.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, #7c3aed, #2563eb);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.subtitle {
    color: #6b7280;
    font-size: 1.125rem;
    max-width: 32rem;
    margin: 0 auto;
    line-height: 1.75;
}

.subtitle-small {
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.inline-icon {
    width: 1rem;
    height: 1rem;
}

.mission-badge {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
}

.mission-badge span {
    background: linear-gradient(135deg, #e5d9ff, #dbeafe);
    border-radius: 50px;
    padding: 0.5rem 1.5rem;
    border: 1px solid #d4b5ff;
    color: #7c3aed;
    font-weight: 500;
}

/* Main content */
.main-content {
    display: flex;
    justify-content: center;
}

/* Challenge Card */
.challenge-card {
    width: 100%;
    max-width: 42rem;
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    border-radius: 0.75rem;
    overflow: hidden;
    position: relative;
}

.card-gradient-border {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0.5rem;
    background: linear-gradient(135deg, #8b5cf6, #3b82f6, #ec4899);
}

.card-header {
    padding: 1.5rem 1.5rem 1rem;
}

.badges-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.category-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid;
}

.difficulty-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: white;
    border: none;
}

/* Category colors */
.category-algorithms { background-color: #dbeafe; color: #1e40af; border-color: #bfdbfe; }
.category-data-structures { background-color: #ede9fe; color: #6b21a8; border-color: #c4b5fd; }
.category-logic-puzzles { background-color: #dcfce7; color: #166534; border-color: #bbf7d0; }
.category-real-world { background-color: #fed7aa; color: #c2410c; border-color: #fdba74; }
.category-math { background-color: #fce7f3; color: #be185d; border-color: #f9a8d4; }

/* Difficulty colors */
.difficulty-easy { background-color: #10b981; }
.difficulty-easy:hover { background-color: #059669; }
.difficulty-medium { background-color: #f59e0b; }
.difficulty-medium:hover { background-color: #d97706; }
.difficulty-hard { background-color: #ef4444; }
.difficulty-hard:hover { background-color: #dc2626; }

.challenge-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #111827;
    line-height: 1.375;
    margin-bottom: 0.5rem;
}

.challenge-description {
    color: #6b7280;
    font-size: 1rem;
    line-height: 1.75;
    margin-bottom: 0.5rem;
}

.challenge-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.875rem;
    color: #6b7280;
    margin-top: 0.5rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.meta-icon {
    width: 1rem;
    height: 1rem;
}

/* Card content */
.card-content {
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Example section */
.example-section {
    background-color: #f9fafb;
    border-radius: 0.5rem;
    padding: 1rem;
    border: 1px solid #e5e7eb;
}

.example-title {
    font-weight: 600;
    color: #374151;
    margin-bottom: 0.5rem;
}

.example-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.875rem;
}

.example-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.example-label {
    color: #6b7280;
}

.example-code {
    background-color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    color: #374151;
    font-family: 'Courier New', monospace;
}

/* Timer section */
.timer-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, #eff6ff, #faf5ff);
    border-radius: 0.5rem;
    padding: 1rem;
    border: 1px solid #dbeafe;
}

.timer-display {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.timer-time {
    font-size: 1.5rem;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    color: #374151;
}

.timer-label {
    font-size: 0.875rem;
    color: #6b7280;
}

.timer-controls {
    display: flex;
    gap: 0.5rem;
}

/* Hints section */
.hints-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.hints-content {
    background-color: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: 0.5rem;
    padding: 1rem;
}

.hints-title {
    font-weight: 600;
    color: #92400e;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.hints-icon {
    width: 1rem;
    height: 1rem;
}

.hints-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.875rem;
    color: #a16207;
}

.hints-list li {
    display: flex;
    gap: 0.5rem;
}

.hint-number {
    color: #f59e0b;
    font-weight: 700;
}

/* Card footer */
.card-footer {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    border: 1px solid transparent;
    text-decoration: none;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.btn:hover {
    transform: scale(1.02);
}

.btn-icon {
    width: 1rem;
    height: 1rem;
}

.btn-primary {
    background-color: #374151;
    color: white;
}

.btn-primary:hover {
    background-color: #111827;
}

.btn-destructive {
    background-color: #ef4444;
    color: white;
}

.btn-destructive:hover {
    background-color: #dc2626;
}

.btn-outline {
    background-color: transparent;
    color: #374151;
    border: 1px solid #d1d5db;
}

.btn-outline:hover {
    background-color: #f9fafb;
    border-color: #9ca3af;
}

.btn-gradient {
    background: linear-gradient(135deg, #8b5cf6, #3b82f6);
    color: white;
    font-weight: 600;
    padding: 0.75rem 1rem;
}

.btn-gradient:hover {
    background: linear-gradient(135deg, #7c3aed, #2563eb);
    transform: scale(1.05);
}

.btn-full-width {
    width: 100%;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 3rem;
    color: #6b7280;
    font-size: 0.875rem;
}

.footer p {
    margin-bottom: 0.25rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .main-title {
        font-size: 1.875rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .challenge-card {
        margin: 0 0.5rem;
    }
    
    .timer-section {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .timer-controls {
        justify-content: center;
    }
}