/* Simon Britton - Personal Website & BMS Fundamentals Resource Site */

/* Custom Fonts */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Rajdhani:wght@300;400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

/* CSS Variables */
:root {
    /* Primary Colors - Cyan/Teal Tech Palette */
    --primary: #00d4ff;
    --primary-dark: #00a8cc;
    --primary-glow: rgba(0, 212, 255, 0.3);
    
    /* Accent Colors */
    --accent: #ff006e;
    --accent-secondary: #8338ec;
    --success: #00f5a0;
    --warning: #ffd60a;
    --error: #ff4757;
    
    /* Dark Theme Base */
    --bg-dark: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a25;
    --bg-elevated: #16161f;
    --bg-input: #1e1e2a;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    
    /* Borders & Lines */
    --border: #2a2a3a;
    --border-glow: rgba(0, 212, 255, 0.5);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #00a8cc 100%);
    --gradient-accent: linear-gradient(135deg, #ff006e 0%, #8338ec 100%);
    --gradient-dark: linear-gradient(180deg, #12121a 0%, #0a0a0f 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(131, 56, 236, 0.1) 100%);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--primary-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-dark);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Background Grid Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: -1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    letter-spacing: 0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--text-primary);
}

code, pre {
    font-family: 'Space Mono', monospace;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
}

code {
    padding: 0.2em 0.4em;
    font-size: 0.9em;
}

pre {
    padding: var(--space-lg);
    overflow-x: auto;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-wide {
    max-width: 1400px;
}

.container-narrow {
    max-width: 800px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    box-shadow: var(--shadow-glow);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--space-sm) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    opacity: 0.3;
    pointer-events: none;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--space-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.4rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: 'Rajdhani', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--bg-dark);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--primary-glow);
    color: var(--bg-dark);
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: var(--bg-dark);
}

.btn-accent {
    background: var(--gradient-accent);
    color: var(--text-primary);
}

.btn-sm {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.1rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-normal);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.card-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.card-excerpt {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-xl);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Section Styling */
.section {
    padding: var(--space-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-title {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Book Feature Section */
.book-feature {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-3xl);
    align-items: center;
    padding: var(--space-3xl);
    background: var(--gradient-glow);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
}

.book-cover {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

.book-cover:hover {
    transform: scale(1.02) rotate(-1deg);
}

.book-info h2 {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.book-info p {
    font-size: 1.1rem;
    margin-bottom: var(--space-xl);
}

/* Resource Cards */
.resource-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.resource-card:hover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
}

.resource-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.resource-icon svg {
    width: 24px;
    height: 24px;
    color: var(--bg-dark);
}

.resource-info h4 {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.resource-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Footer */
.footer {
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand p {
    margin-top: var(--space-md);
    font-size: 0.95rem;
}

.footer-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-lg);
    color: var(--primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--bg-dark);
}

/* Forms */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-md);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

/* Tags */
.tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
}

/* Alerts */
.alert {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    border: 1px solid;
}

.alert-success {
    background: rgba(0, 245, 160, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.alert-error {
    background: rgba(255, 71, 87, 0.1);
    border-color: var(--error);
    color: var(--error);
}

.alert-warning {
    background: rgba(255, 214, 10, 0.1);
    border-color: var(--warning);
    color: var(--warning);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-2xl);
}

.pagination a,
.pagination span {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

.pagination a:hover,
.pagination .current {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--bg-dark);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.hidden { display: none; }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px var(--primary-glow); }
    50% { box-shadow: 0 0 40px var(--primary-glow); }
}

.animate-fade { animation: fadeIn 0.5s ease; }
.animate-slide { animation: slideUp 0.5s ease; }
.animate-glow { animation: glow 2s infinite; }

/* Responsive */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .book-feature { grid-template-columns: 1fr; text-align: center; }
}

@media (max-width: 768px) {
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1.1rem; }
    
    .menu-toggle { display: flex; }
    
    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-dark);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        border-bottom: 1px solid var(--border);
        display: none;
    }
    
    .nav.active { display: flex; }
    
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: var(--space-xl); }
    .footer-bottom { flex-direction: column; gap: var(--space-md); text-align: center; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .section { padding: var(--space-2xl) 0; }
    .hero { padding: 120px 0 80px; }
}

/* Print Styles */
@media print {
    .header, .footer, .btn { display: none; }
    body { background: white; color: black; }
}