@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500&display=swap');

body { 
    font-family: 'Sarabun', sans-serif; 
    background: #0a0a0a;
    color: #e0e0e0;
}

.gradient-bg { 
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    position: relative;
    overflow: hidden;
}

.gradient-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23ffffff" stroke-width="0.1" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.card-hover { 
    transition: all 0.3s ease; 
    background: rgba(20, 20, 30, 0.8);
    border: 1px solid rgba(100, 255, 218, 0.1);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.card-hover:hover { 
    transform: translateY(-5px); 
    box-shadow: 0 20px 40px rgba(100, 255, 218, 0.1);
    border-color: rgba(100, 255, 218, 0.3);
    background: rgba(20, 20, 30, 0.9);
}

.code-block { 
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%); 
    border-radius: 8px; 
    overflow-x: auto;
    border: 1px solid #30363d;
    font-family: 'Fira Code', monospace;
}

.difficulty-easy { background: linear-gradient(45deg, #00ff88, #00cc6a); }
.difficulty-medium { background: linear-gradient(45deg, #ffaa00, #ff8800); }
.difficulty-hard { background: linear-gradient(45deg, #ff0066, #cc0044); }

.matrix-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.05;
}

.glitch-text {
    position: relative;
    animation: glitch 2s infinite;
}

@keyframes glitch {
    0%, 100% { transform: translate(0); }
    20% { transform: translate(-2px, 2px); }
    40% { transform: translate(-2px, -2px); }
    60% { transform: translate(2px, 2px); }
    80% { transform: translate(2px, -2px); }
}

.secret-hover {
    cursor: pointer;
    transition: all 0.3s ease;
}

.secret-hover:hover {
    color: #00ff88 !important;
    text-shadow: 0 0 10px #00ff88;
}

.easter-egg {
    opacity: 0;
    transition: opacity 0.5s ease;
}

.easter-egg.revealed {
    opacity: 1;
}

.hacker-cursor {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.neon-glow {
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
    border: 1px solid rgba(100, 255, 218, 0.5);
}

.terminal-green { color: #00ff88; }
.terminal-red { color: #ff0066; }
.terminal-yellow { color: #ffaa00; }
.terminal-blue { color: #0099ff; }
.terminal-purple { color: #cc66ff; }

/* Fallback positioning for the background canvas and modal z-index.
    This ensures the canvas stays behind content even if Tailwind doesn't load. */
#matrix-canvas { position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: -1; pointer-events: none; }
#lab-modal { z-index: 50; }

/* Enhanced mobile-first responsive design */
@media (max-width: 768px) {
    .grid-cols-1 { grid-template-columns: 1fr !important; }
    .md\:grid-cols-2 { grid-template-columns: 1fr !important; }
    
    /* Mobile-friendly buttons */
    button, .start-btn {
        min-height: 44px !important;
        font-size: 16px !important;
        padding: 12px 16px !important;
    }
    
    /* Touch-friendly spacing */
    .gap-4 { gap: 1.5rem !important; }
    .p-4 { padding: 1.5rem !important; }
    
    /* Readable text sizes */
    .text-sm { font-size: 16px !important; }
    body { font-size: 16px !important; }
    
    /* Modal improvements */
    #lab-modal .bg-gray-900 {
        width: 95vw !important;
        max-height: 90vh !important;
        overflow-y: auto !important;
    }
}

/* Minimal fallback utility classes used by the page so content remains visible
    if Tailwind CDN fails to load on mobile. Keep these lightweight. */
.hidden { display: none !important; }
.flex { display: flex !important; }
.items-center { align-items: center !important; }
.justify-between { justify-content: space-between !important; }
.space-x-2 > * + * { margin-left: 0.5rem !important; }
.p-4 { padding: 1rem !important; }
.text-2xl { font-size: 1.5rem !important; }
.text-xl { font-size: 1.25rem !important; }
.text-lg { font-size: 1.125rem !important; }
.font-bold { font-weight: 700 !important; }
.font-semibold { font-weight: 600 !important; }
.grid { display: grid !important; }
.grid-cols-1 { grid-template-columns: 1fr !important; }
.md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr) !important; }
.gap-4 { gap: 1rem !important; }
.rounded { border-radius: 8px !important; }
.fixed { position: fixed !important; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.list-none { list-style: none; padding: 0; margin: 0; }
.bg-gray-900 { background-color: #111827 !important; }
.bg-gray-800 { background-color: #1f2937 !important; }
.bg-blue-600 { background-color: #2563eb !important; }
.bg-yellow-500 { background-color: #eab308 !important; }
.bg-red-600 { background-color: #dc2626 !important; }
.text-white { color: #ffffff !important; }
.text-black { color: #000000 !important; }
.border { border-width: 1px !important; }
.border-gray-700 { border-color: #374151 !important; }
.w-11\/12 { width: 91.666667% !important; }
.max-w-3xl { max-width: 48rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 0.75rem !important; }
.mt-6 { margin-top: 1.5rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.px-2 { padding-left: 0.5rem !important; padding-right: 0.5rem !important; }
.px-3 { padding-left: 0.75rem !important; padding-right: 0.75rem !important; }
.py-1 { padding-top: 0.25rem !important; padding-bottom: 0.25rem !important; }
.cursor-pointer { cursor: pointer !important; }

/* Error/banner used when JS fails */
.error-banner { background: #ffdde0; color: #660000; padding: 10px 12px; border-radius: 6px; margin: 8px 0; font-weight: 600; }
.error-banner.hidden { display: none; }