/* === style_index.css === */
/* Modern styling for the course selection page */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

/* Light mode variables (default) */
:root {
    --primary-color: #3a86ff;
    --primary-hover: #2667cc;
    --secondary-color: #ff006e;
    --success-color: #38b000;
    --warning-color: #ff9500a6;
    --danger-color: #ff5e5b;
    --dark-color: #2b2d42;
    --text-color: #2b2d42;
    --text-muted: #64748b;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out, background-color 0.3s ease-in-out, color 0.3s ease-in-out, border-color 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
    --transition-fast: transform 0.2s ease-in-out, opacity 0.2s ease-in-out, background-color 0.2s ease-in-out, color 0.2s ease-in-out, border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    --body-bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #e4efe9 100%);
    --body-dot-pattern: rgba(0,0,0,0.05);
    --modal-overlay-bg: rgba(0, 0, 0, 0.6);
    --course-code-bg: linear-gradient(135deg, var(--light-bg) 0%, rgba(248, 250, 252, 0.8) 100%);
}

/* Dark mode variables */
[data-theme="dark"] {
    --primary-color: #3a86ff; /* Same as light mode */
    --primary-hover: #2667cc; /* Same as light mode */
    --secondary-color: #ff006e; /* Same as light mode */
    --success-color: #38b000; /* Same as light mode */
    --warning-color: #ff9500a6; /* Same as light mode */
    --danger-color: #ff5e5b; /* Same as light mode */
    --dark-color: #ffffff; /* Keep white for contrast */
    --text-color: #e0e0e0; /* Light grey for body text */
    --text-muted: #a0a0a0; /* Medium grey for muted text */
    --light-bg: #1a1a1a; /* Very dark grey background */
    --card-bg: #252525; /* Slightly lighter dark grey for cards */
    --border-color: #404040; /* Darker grey border */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.5);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.6), 0 2px 4px -1px rgba(0,0,0,0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.6), 0 4px 6px -2px rgba(0,0,0,0.5);
    --body-bg-gradient: linear-gradient(135deg, #101010 0%, #181818 100%);
    --body-dot-pattern: rgba(255,255,255,0.05);
    --modal-overlay-bg: rgba(0, 0, 0, 0.85);
    --course-code-bg: linear-gradient(135deg, rgba(55, 55, 55, 0.5) 0%, rgba(55, 55, 55, 0.3) 100%);
    /* Keep radii and transitions */
}

/* Background Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 1px 1px, var(--body-dot-pattern) 1px, transparent 0);
    background-size: 20px 20px;
    pointer-events: none;
    z-index: -2;
}

/* Visitor Counter Styles */
.visitor-counter {
    background: linear-gradient(135deg, rgba(58, 134, 255, 0.1) 0%, rgba(58, 134, 255, 0.05) 100%);
    border-radius: var(--border-radius-sm);
    padding: 12px 24px;
    display: inline-block;
    margin-bottom: 15px;
    border-left: 4px solid var(--primary-color);
    backdrop-filter: blur(5px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.visitor-counter:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.visitor-counter p {
    margin: 0;
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

#visitor-count {
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Consolas', Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    background: rgba(58, 134, 255, 0.1);
    padding: 2px 8px;
    border-radius: 6px;
}

/* General Body and Container Styles */
body {
    font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--body-bg-gradient);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 40px 20px;
    margin: 0;
    box-sizing: border-box;
    line-height: 1.6;
    position: relative;
}

.container {
    background-color: var(--card-bg);
    padding: 40px 45px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 1100px;
    text-align: center;
    position: relative;
    z-index: 1;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

/* Decorative Elements */
.container::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    opacity: 0.1;
    border-radius: 50%;
    z-index: -1;
    animation: float 6s ease-in-out infinite;
}

.container::after {
    content: '';
    position: absolute;
    bottom: -30px;
    left: -30px;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    opacity: 0.1;
    border-radius: 50%;
    z-index: -1;
    animation: float 8s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate3d(0, 0, 0); }
    50% { transform: translate3d(0, -10px, 0); }
}

h1 {
    color: var(--dark-color);
    margin-bottom: 10px;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1::after {
    content: '';
    position: absolute;
    width: 60%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.container > p {
    margin-bottom: 40px;
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 25px;
    line-height: 1.8;
}

/* Course Grid Layout */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 30px;
    margin-bottom: 40px;
}

/* Individual Course Item Styling */
.course-item {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 28px 24px;
    text-align: center;
    background-color: var(--card-bg);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    box-sizing: border-box;
    position: relative;
    overflow: hidden;
    will-change: transform;
    -webkit-tap-highlight-color: transparent;
    backdrop-filter: blur(5px);
}

.course-item h2 {
    margin: 0 0 15px 0;
    font-size: 1.25rem;
    color: var(--dark-color);
    font-weight: 600;
    line-height: 1.4;
    flex-grow: 1;
}

.course-item .course-code {
    margin: 0 0 15px 0;
    font-size: 0.95rem;
    color: var(--text-muted);
    font-family: 'Consolas', Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    background: var(--course-code-bg);
    padding: 6px 12px;
    border-radius: 20px;
    display: inline-block;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

/* Styling for AVAILABLE Course Items */
.course-item.available {
    border-left: 5px solid var(--success-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.course-item.available::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(56, 176, 0, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: 0;
    opacity: 0;
    transition: var(--transition);
}

.course-item.available span {
    font-weight: 600;
    color: var(--success-color);
    font-size: 1rem;
    padding: 10px 0;
    background: linear-gradient(135deg, rgba(56, 176, 0, 0.1) 0%, rgba(56, 176, 0, 0.05) 100%);
    border-radius: 8px;
    width: 100%;
    display: inline-block;
    position: relative;
    transition: var(--transition);
    z-index: 1;
    border: 1px solid rgba(56, 176, 0, 0.1);
    box-sizing: border-box;
}

.course-item.available:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: rgba(56, 176, 0, 0.3);
}

.course-item.available:hover::before {
    opacity: 1;
}

.course-item.available:hover span {
    background: linear-gradient(135deg, var(--success-color) 0%, #2d9a00 100%);
    color: white;
    border-color: transparent;
}

/* Styling for UNAVAILABLE Course Items */
.course-item.unavailable {
    background-color: var(--light-bg);
    border-left: 5px solid var(--warning-color);
    cursor: not-allowed;
    opacity: 0.8;
}

.course-item.unavailable h2,
.course-item.unavailable .course-code,
.course-item.unavailable span {
    color: var(--warning-color);
    font-weight: 500;
    font-size: 0.9rem;
}

.course-item.unavailable .course-code { 
    background-color: rgba(100, 116, 139, 0.1);
}

.course-item.unavailable span { 
    font-style: italic;
    font-size: 0.9rem;
    margin-top: auto;
    padding: 8px 0;
    background-color: rgba(100, 116, 139, 0.08);
    border-radius: 4px;
    width: 100%;
    display: inline-block;
}

/* --- MODAL STYLES --- */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-overlay-bg);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
}

.modal-overlay.active {
    opacity: 1;
}

.modal-content {
    background: var(--card-bg);
    padding: 35px 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 400px;
    position: relative;
    transform: translateY(-20px);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin: 15px;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
    line-height: 1;
    padding: 5px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.05);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close-btn:hover {
    color: var(--danger-color);
    background: rgba(255, 94, 91, 0.1);
    transform: rotate(90deg);
}

.modal-content h2 {
    color: var(--dark-color);
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.8rem;
    font-weight: 600;
}

.modal-content p {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 25px;
    line-height: 1.6;
}

#modal-player-name {
    width: 100%;
    padding: 14px 18px;
    margin-bottom: 5px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    box-sizing: border-box;
    background-color: var(--light-bg);
    color: var(--text-color);
    transition: var(--transition-fast);
}

#modal-player-name:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 20%, transparent);
}

#modal-player-name.error {
    border-color: var(--danger-color);
    background-color: color-mix(in srgb, var(--danger-color) 5%, var(--light-bg));
}

.modal-error-message {
    color: var(--danger-color);
    font-size: 0.9rem;
    margin: 5px 0 10px;
    min-height: 20px;
}

#modal-start-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--success-color) 0%, #2d9a00 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

#modal-start-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

#modal-start-btn:disabled {
    background-color: var(--text-muted);
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

#modal-target-url {
    display: none;
}

/* Loading Dots Animation */
.loading-dots {
    display: inline-block;
    position: relative;
}

.loading-dots::after {
    content: '...';
    position: absolute;
    animation: loading-dots 1.4s infinite;
}

@keyframes loading-dots {
    0% { content: '.'; }
    33% { content: '..'; }
    66% { content: '...'; }
}

/* Course Item Click Animation */
.course-item.clicked {
    transform: scale(0.98);
    transition: transform 0.2s ease;
}

/* Accessibility Improvements */
.course-link {
    outline: none;
}

.course-link:focus-visible {
    box-shadow: 0 0 0 3px var(--primary-color);
    border-radius: var(--border-radius-sm);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .container {
        padding: 30px 25px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .container > p {
        font-size: 1rem;
        margin-bottom: 30px;
    }
    
    .course-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }
    
    .course-item {
        padding: 24px 20px;
    }
    
    .theme-toggle {
        top: 15px;
        right: 15px;
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    /* Optimize animations for mobile */
    :root {
        /* Simplify transitions for mobile for potentially smoother performance */
        --transition: transform 0.2s ease-in-out, opacity 0.2s ease-in-out, background-color 0.2s ease-in-out, color 0.2s ease-in-out, border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
        --transition-fast: transform 0.15s ease-in-out, opacity 0.15s ease-in-out, background-color 0.15s ease-in-out, color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    }
    
    body {
        padding: 20px 10px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h1::after {
        height: 3px;
        bottom: -8px;
    }
    
    .container {
        padding: 25px 15px;
        border-radius: 12px;
    }
    
    .container > p {
        font-size: 0.95rem;
        margin-bottom: 25px;
        margin-top: 20px;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .modal-content {
        padding: 25px 20px;
        width: 90%;
    }
    
    .modal-content h2 {
        font-size: 1.5rem;
    }
    
    .modal-content p {
        font-size: 0.9rem;
    }
    
    .course-item {
        padding: 20px 15px;
    }
    
    .course-item h2 {
        font-size: 1.1rem;
    }
    
    .course-item.available:hover {
        transform: none;
        box-shadow: var(--shadow);
    }
    
    .course-item.available:active {
        transform: scale(0.98);
    }
    
    .course-item.available span {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
    
    .course-item.available:active span {
        background: var(--primary-hover);
    }
    
    #modal-start-btn:hover {
        transform: none;
    }
    
    #modal-start-btn:active {
        transform: scale(0.98);
        background-color: var(--primary-hover);
    }
    
    #modal-player-name {
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    
    #modal-start-btn {
        padding: 12px 20px;
        font-size: 0.95rem;
    }
    
    .modal-close-btn {
        top: 10px;
        right: 10px;
        width: 30px;
        height: 30px;
        font-size: 1.5rem;
        line-height: 30px;
    }
    
    .theme-toggle {
        top: 10px;
        right: 10px;
        padding: 7px 10px;
        font-size: 0.75rem;
    }
    
    .container::before,
    .container::after {
        animation: none !important;
    }
}

/* Add hardware acceleration for smoother animations */
.course-item,
.modal-content,
#modal-start-btn {
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Apply theme transition to relevant elements */
/* Apply theme transition to relevant elements */
body, .container, .course-item, .modal-content, #modal-player-name, #modal-start-btn, .visitor-counter {
    /* Apply transitions for properties that change with theme */
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* Ensure other animated properties use the defined transitions */
.course-item, .visitor-counter, .theme-toggle {
    transition: var(--transition); /* Use the full transition variable */
}

.modal-overlay, .modal-content {
     /* Specific transitions for modal show/hide */
    transition: opacity 0.3s ease, transform 0.3s ease;
    will-change: opacity, transform; /* Add will-change for performance hint */
}

.modal-close-btn {
    transition: var(--transition-fast), transform 0.3s ease; /* Add transform transition */
}

#modal-player-name:focus {
    transition: var(--transition-fast), box-shadow 0.3s ease; /* Add box-shadow transition */
}

#modal-start-btn {
    transition: var(--transition); /* Use the full transition variable */
}

/* Optional: Add preference for system setting */
/* @media (prefers-color-scheme: dark) { */
/*    Add styles here if you want automatic detection without JS toggle */
/*    Example: */
/*    :root { */
        /* Apply dark mode variables directly */
/*        --primary-color: #4a9eff; */
        /* ... etc ... */
/*    } */
/* } */

/* --- Top Buttons Row for Portfolio & Theme Toggle --- */
.top-buttons-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 100%;
    margin-bottom: 18px;
    gap: 10px;
}

/* Remove absolute positioning for both buttons */
.theme-toggle, .portfolio-btn {
    position: static;
    margin: 0;
    top: unset;
    left: unset;
    right: unset;
    z-index: 1;
}

/* Keep button look */
.theme-toggle, .portfolio-btn {
    background-color: color-mix(in srgb, var(--card-bg) 80%, transparent);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-fast);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 120px;
    height: 40px;
    box-sizing: border-box;
}

.theme-toggle .theme-icon {
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover, .portfolio-btn:hover {
    background-color: color-mix(in srgb, var(--card-bg) 100%, transparent);
    color: var(--text-color);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.theme-toggle:focus, .portfolio-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 20%, transparent);
}

@media (max-width: 768px) {
    .theme-toggle, .portfolio-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    .top-buttons-row {
        margin-bottom: 12px;
    }
}

@media (max-width: 480px) {
    .theme-toggle, .portfolio-btn {
        padding: 7px 10px;
        font-size: 0.75rem;
    }
    .top-buttons-row {
        margin-bottom: 8px;
    }
}

.theme-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  transition: color 0.3s;
}
.theme-icon svg {
  width: 24px;
  height: 24px;
  display: block;
}
.theme-icon-animate {
  animation: theme-icon-rotate 0.5s cubic-bezier(0.4,0,0.2,1);
}
@keyframes theme-icon-rotate {
  0% { transform: rotate(-180deg); opacity: 0; }
  60% { opacity: 1; }
  100% { transform: rotate(0deg); opacity: 1; }
}