/* 
   Kipinä Technologies — Multi-Theme Agentic AI Layout 
   Inspired by: Geometric Gecko, Cyber-Industrial Forge, Abstract Serpent
*/

:root {
    /* Default Fallback (Forge Core) */
    --bg-main: #060b11;
    --bg-alt: #0c1622;
    --bg-card: #121e2d;
    --bg-terminal: #030609;
    
    --text-primary: #e0f2fe;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    
    --accent-primary: #f0854a; /* Pehmeä oranssi */
    --accent-secondary: #00e5ff; /* Cyan Core */
    --accent-glow: rgba(240, 133, 74, 0.4);
    
    --border-color: rgba(0, 229, 255, 0.15);
    --border-hover: rgba(0, 229, 255, 0.4);
    --glass-bg: rgba(6, 11, 17, 0.8);

    /* Typography */
    --font-sans: 'DM Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition-normal: 0.3s ease;
}

/* Theme 1: Geometric Circuitry Gecko (Gold/Orange Fire) */
[data-theme="gecko"] {
    --bg-main: #0a0500;
    --bg-alt: #140a00;
    --bg-card: #1f1000;
    --bg-terminal: #050200;
    
    --text-primary: #fff5e6;
    --text-secondary: #ffbba1;
    --text-muted: #8c5a42;
    
    --accent-primary: #ff7b00;
    --accent-secondary: #ffae00;
    --accent-glow: rgba(255, 123, 0, 0.4);
    
    --border-color: rgba(255, 174, 0, 0.15);
    --border-hover: rgba(255, 174, 0, 0.4);
    --glass-bg: rgba(10, 5, 0, 0.8);
}

/* Theme 2: Cyber-Industrial Forge-Core (Industrial Blue/Cyan + Orange Fire) */
[data-theme="forge"] {
    --bg-main: #060b11;
    --bg-alt: #0c1622;
    --bg-card: #121e2d;
    --bg-terminal: #030609;
    
    --text-primary: #e0f2fe;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    
    --accent-primary: #00e5ff; /* Cyan as primary text */
    --accent-secondary: #ff5e3a; /* Orange as secondary "spark" */
    --accent-glow: rgba(0, 229, 255, 0.4);
    
    --border-color: rgba(0, 229, 255, 0.15);
    --border-hover: rgba(0, 229, 255, 0.4);
    --glass-bg: rgba(6, 11, 17, 0.8);
}

/* Theme 3: Abstract Data-Stream Serpent (Neon Cyan/Teal, Deep Black) */
[data-theme="serpent"] {
    --bg-main: #000808;
    --bg-alt: #001212;
    --bg-card: #001e1e;
    --bg-terminal: #000000;
    
    --text-primary: #ccffff;
    --text-secondary: #66cccc;
    --text-muted: #226666;
    
    --accent-primary: #00ffff;
    --accent-secondary: #00ffaa;
    --accent-glow: rgba(0, 255, 255, 0.4);
    
    --border-color: rgba(0, 255, 255, 0.15);
    --border-hover: rgba(0, 255, 255, 0.4);
    --glass-bg: rgba(0, 8, 8, 0.8);
}

/* Base Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; overflow-x: hidden; width: 100%; }
body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
    transition: background-color 0.5s ease, color 0.5s ease;
}

a { color: var(--text-primary); text-decoration: none; transition: color var(--transition-normal); }
a:hover { color: var(--accent-primary); }
ul { list-style: none; }

h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; margin-bottom: 1rem; letter-spacing: -0.02em; }
p { margin-bottom: 1.5rem; color: var(--text-secondary); }

.text-gradient {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.text-green { color: var(--accent-secondary); }
.text-blue { color: var(--accent-primary); }
.text-gray { color: var(--text-muted); }

/* Layout & Containers */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 2rem; position: relative; }
.section-padding { padding: 6rem 0; }
.bg-alt { background-color: var(--bg-alt); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }

/* Grid Background Effect (Circuitry vibe) */
.bg-gradient {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-size: 40px 40px;
    background-image: 
        linear-gradient(to right, var(--border-color) 1px, transparent 1px),
        linear-gradient(to bottom, var(--border-color) 1px, transparent 1px);
    opacity: 0.15;
    z-index: -2;
    pointer-events: none;
}

/* Navigation */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; height: 80px;
    background: var(--glass-bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-content { display: flex; justify-content: space-between; align-items: center; height: 100%; }

.nav-actions { display: flex; align-items: center; gap: 0.75rem; }
.theme-cycle-btn {
    background: var(--bg-card); border: 1px solid var(--border-color);
    font-size: 0.9rem; cursor: pointer; padding: 0.4rem 0.5rem;
    border-radius: 8px; transition: all var(--transition-normal);
    line-height: 1;
}
.theme-cycle-btn:hover { border-color: var(--accent-primary); box-shadow: 0 0 8px var(--accent-glow); }
.logo {
    font-family: var(--font-mono); font-size: 1.5rem; font-weight: 700;
    display: flex; align-items: center; gap: 0.5rem;
    text-shadow: 0 0 10px var(--accent-glow);
}
.logo-accent { color: var(--accent-primary); }
.logo-sub { font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; text-shadow: none; letter-spacing: 0.08em; text-transform: uppercase; }

.desktop-nav ul { display: flex; gap: 2rem; }
.desktop-nav a { font-size: 0.95rem; font-weight: 500; position: relative; }
.desktop-nav a::after {
    content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
    background-color: var(--accent-primary); transition: width var(--transition-normal);
}
.desktop-nav a:hover::after, .desktop-nav a.active::after { width: 100%; box-shadow: 0 0 8px var(--accent-primary); }

/* Auth Status */
.auth-status { display: flex; align-items: center; gap: 0.75rem; }
.auth-status .nav-cta { padding: 0.4rem 1rem; font-size: 0.8rem; }
.auth-user {
    display: flex; align-items: center; gap: 0.5rem;
    font-size: 0.85rem; color: var(--text-secondary);
}
.auth-user .user-email { font-family: var(--font-mono); color: var(--accent-primary); font-size: 0.8rem; }
.auth-user .logout-btn {
    background: transparent; border: 1px solid var(--border-color); border-radius: 4px;
    color: var(--text-secondary); padding: 0.3rem 0.6rem; font-size: 0.75rem;
    cursor: pointer; font-family: var(--font-sans); transition: all 0.2s;
}
.auth-user .logout-btn:hover { border-color: var(--accent-primary); color: var(--accent-primary); }

/* Mobile Navigation Toggle */
.mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; width: 30px; height: 20px; position: relative; z-index: 1001; }
.mobile-menu-btn span { display: block; width: 100%; height: 2px; background-color: var(--text-primary); position: absolute; transition: all var(--transition-normal); }
.mobile-menu-btn span:nth-child(1) { top: 0; }
.mobile-menu-btn span:nth-child(2) { top: 9px; }
.mobile-menu-btn span:nth-child(3) { top: 18px; }

.mobile-nav-overlay {
    display: none;
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    background: var(--glass-bg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    z-index: 999;
    flex-direction: column; align-items: center; justify-content: center; gap: 2rem;
    opacity: 0; transition: opacity 0.3s ease;
}
.mobile-nav-overlay.active { display: flex; opacity: 1; }
.mobile-nav-overlay a {
    font-size: 1.4rem; font-weight: 600; color: var(--text-primary);
    padding: 0.8rem 2rem; transition: color var(--transition-normal);
}
.mobile-nav-overlay a:hover { color: var(--accent-primary); }
.mobile-nav-overlay .mobile-theme-switcher {
    display: flex; gap: 0.75rem; margin-top: 1rem;
}
.mobile-menu-btn.open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.mobile-menu-btn.open span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0.75rem 1.5rem; border-radius: 4px; font-weight: 600; font-size: 0.95rem;
    cursor: pointer; transition: all var(--transition-normal);
    font-family: var(--font-sans); border: none; text-transform: uppercase; letter-spacing: 1px;
}
.btn-primary {
    background-color: var(--accent-primary); color: var(--bg-main);
    box-shadow: 0 0 15px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px var(--accent-glow);
    background-color: var(--text-primary);
}
.btn-secondary { background-color: transparent; color: var(--accent-primary); border: 1px solid var(--accent-primary); }
.btn-secondary:hover { background-color: var(--accent-glow); }
.btn-large { padding: 1rem 2rem; font-size: 1.1rem; }

/* Sections */
.hero { min-height: 100vh; display: flex; align-items: center; padding-top: 100px; }
.hero-container { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.hero-title { font-size: clamp(2.2rem, 5vw, 4rem); line-height: 1.1; margin-bottom: 1.5rem; text-shadow: 0 0 20px rgba(0,0,0,0.5); }
.hero-desc { font-size: 1.15rem; margin-bottom: 1rem; max-width: 90%; }
.hero-notice {
    font-size: 0.95rem; color: var(--accent-secondary); font-weight: 500;
    margin-bottom: 2.5rem; max-width: 90%; opacity: 0.85;
    border-left: 2px solid var(--accent-secondary); padding-left: 0.75rem;
}
.hero-actions { display: flex; gap: 1rem; margin-bottom: 3rem; }

.badge {
    display: inline-block; padding: 0.4rem 0.8rem;
    background-color: var(--accent-glow); color: var(--accent-primary);
    border: 1px solid var(--accent-primary); border-radius: 4px;
    font-size: 0.85rem; font-weight: 600; margin-bottom: 1.5rem; font-family: var(--font-mono);
    text-shadow: 0 0 5px var(--accent-primary);
}

.hero-stats { display: flex; flex-wrap: wrap; gap: 2.5rem; border-top: 1px solid var(--border-color); padding-top: 2rem; }
.stat-item { display: flex; flex-direction: column; }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--accent-primary); text-shadow: 0 0 10px var(--accent-glow); }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; }

.hero-visual { position: relative; }
.theme-img-wrapper {
    position: absolute;
    top: -120px;
    right: -10px;
    width: 450px;
    height: 450px;
    opacity: 0.8;
    z-index: 1;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 0 60px var(--accent-glow);
    transition: all var(--transition-normal);
    animation: float 6s ease-in-out infinite;
}
.theme-img-wrapper img { width: 100%; height: 100%; object-fit: cover; mix-blend-mode: screen; transition: opacity 0.3s ease; }

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-15px) rotate(2deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

.terminal-window {
    background-color: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-radius: 4px; border: 1px solid var(--border-hover);
    box-shadow: 0 0 30px var(--accent-glow); overflow: hidden; font-family: var(--font-mono); font-size: 0.9rem;
    position: relative; z-index: 2;
}
.terminal-window::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 2px, 3px 100%; pointer-events: none; z-index: 10;
}
.terminal-header {
    background-color: var(--bg-card); padding: 10px 15px; display: flex; align-items: center;
    border-bottom: 1px solid var(--border-hover);
}
.term-btn { width: 12px; height: 12px; border-radius: 50%; margin-right: 8px; }
.term-btn.close { background-color: #ff5f56; }
.term-btn.minimize { background-color: #ffbd2e; }
.term-btn.expand { background-color: #27c93f; }
.term-title { margin-left: auto; margin-right: auto; color: var(--accent-primary); font-size: 0.8rem; }
.terminal-body { padding: 1.5rem; min-height: 200px; max-height: 300px; overflow-y: auto; color: var(--text-primary); }
.prompt { color: var(--accent-secondary); margin-right: 10px; font-weight: bold; }
.mt-2 { margin-top: 1.5rem; }
.typing-effect {
    display: inline-block; overflow: hidden; white-space: nowrap; border-right: 2px solid var(--accent-primary);
    animation: typing 3s steps(30, end), blink-caret .75s step-end infinite; color: var(--text-primary);
}

.section-header { max-width: 600px; margin-bottom: 4rem; }
.section-header.text-center { margin-left: auto; margin-right: auto; }
.text-center { text-align: center; }
.section-subtitle { font-family: var(--font-mono); color: var(--accent-primary); font-size: 0.9rem; display: block; margin-bottom: 1rem; }
.section-title { font-size: clamp(1.8rem, 4vw, 2.5rem); }

/* Learning Path */
.learning-path { display: flex; align-items: flex-start; justify-content: center; gap: 1.5rem; flex-wrap: wrap; }
.path-step { flex: 1; min-width: 220px; max-width: 320px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 2rem 1.5rem; text-align: center; transition: var(--transition-normal); }
.path-step:hover { border-color: var(--border-hover); transform: translateY(-4px); }
.path-icon { font-size: 2.5rem; margin-bottom: 1rem; font-family: var(--font-mono); }
.path-title { font-size: 1.3rem; margin-bottom: 0.75rem; color: var(--text-primary); }
.path-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 1rem; }
.path-level { font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent-primary); background: rgba(240, 133, 74, 0.1); padding: 0.25rem 0.75rem; border-radius: 20px; }
.path-arrow { font-size: 2rem; color: var(--text-muted); align-self: center; padding-top: 1rem; }
@media (max-width: 768px) { .path-arrow { display: none; } .learning-path { flex-direction: column; align-items: center; } .path-step { max-width: 100%; } }

.modules-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); gap: 2rem; }
.module-card {
    background-color: var(--bg-card); border: 1px solid var(--border-color); border-radius: 4px;
    padding: 2.5rem; transition: all var(--transition-normal); position: relative; overflow: hidden;
    cursor: pointer;
}
.module-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 2px; height: 0;
    background-color: var(--accent-primary); transition: height var(--transition-normal);
    box-shadow: 0 0 10px var(--accent-primary);
}
.module-card:hover { transform: translateY(-5px); border-color: var(--accent-primary); box-shadow: 0 10px 30px var(--accent-glow); }
.module-card:hover::before { height: 100%; }
.module-number { font-family: var(--font-mono); font-size: 1.5rem; color: var(--accent-secondary); margin-bottom: 1.5rem; text-shadow: 0 0 5px var(--accent-glow); }
.module-card h3 { font-size: 1.4rem; margin-bottom: 1rem; color: var(--text-primary); }
.module-tech { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.module-tech li {
    font-size: 0.8rem; font-family: var(--font-mono); padding: 0.2rem 0.6rem;
    background-color: var(--bg-main); border: 1px solid var(--border-color); color: var(--text-primary);
}

/* Course Catalog */
.course-catalog {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
    gap: 2rem;
}
.course-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 2rem 2.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--accent-glow);
}
.course-card--inactive {
    opacity: 0.55;
    cursor: default;
}
.course-card--inactive:hover {
    transform: none;
    box-shadow: none;
}
.course-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
    flex-wrap: nowrap;
}
.course-card__title {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 0;
    white-space: nowrap;
}
.course-card__level {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.2rem 0.7rem;
    border: 1px solid;
    border-radius: 3px;
    white-space: nowrap;
    flex-shrink: 0;
}
.course-card__subtitle {
    font-size: 1rem;
    color: var(--accent-primary);
    font-weight: 500;
    margin-bottom: 1rem;
}
.course-card__desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    flex-grow: 1;
}
.course-card__target {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}
.course-card__target-label {
    font-weight: 600;
    color: var(--text-secondary);
}
.course-card__version { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted); background: rgba(255,255,255,0.05); padding: 0.15rem 0.5rem; border-radius: 8px; cursor: default; }
.course-card__price { font-size: 1.5rem; font-weight: 700; color: var(--text-primary); margin-top: auto; padding-top: 1rem; }
.course-card__price-vat { font-size: 0.75rem; font-weight: 400; color: var(--text-muted); }
.course-card__footer {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.course-card__btn {
    font-size: 0.9rem;
    padding: 0.5rem 1.5rem;
}
.course-card__coming {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    padding: 0.4rem 1rem;
    border-radius: 3px;
}
.course-card__module-count {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(250px, 100%), 1fr)); gap: 1.5rem; }
.tool-item {
    display: flex; flex-direction: column; padding: 1.5rem; background-color: var(--bg-main);
    border: 1px solid var(--border-color); border-left: 2px solid var(--border-color);
    transition: all var(--transition-normal);
}
.tool-item:hover { border-left-color: var(--accent-primary); background-color: var(--bg-card); box-shadow: -5px 0 15px var(--accent-glow); }
.tool-name { font-family: var(--font-mono); font-weight: 700; font-size: 1.1rem; color: var(--text-primary); margin-bottom: 0.5rem; }
.tool-role { font-size: 0.9rem; color: var(--text-secondary); }

.cta-title { font-size: clamp(1.8rem, 4vw, 3rem); margin-bottom: 1.5rem; }
.cta-desc { font-size: 1.2rem; max-width: 600px; margin: 0 auto 2.5rem; }

.footer { background-color: var(--bg-alt); border-top: 1px solid var(--border-color); padding: 4rem 0 2rem; }
.footer-container { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 4rem; }
.footer-desc { margin-top: 1.5rem; max-width: 300px; font-size: 0.95rem; }
.footer-heading { font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.9rem; color: var(--accent-primary); margin-bottom: 1.5rem; }
.footer-links ul li { margin-bottom: 0.8rem; }
.footer-links a { color: var(--text-secondary); font-size: 0.95rem; }
.footer-links a:hover { color: var(--accent-primary); text-shadow: 0 0 5px var(--accent-glow); }
.copyright { border-top: 1px solid var(--border-color); padding-top: 2rem; color: var(--text-muted); font-size: 0.9rem; }

/* Course Environment Overlay */
.course-env {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    background-color: var(--glass-bg); z-index: 2000;
    backdrop-filter: blur(35px); -webkit-backdrop-filter: blur(35px);
    display: none; flex-direction: row;
    transform: translateY(20px); opacity: 0;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}
.course-env.active { opacity: 1; transform: translateY(0); }
.course-sidebar {
    width: 320px; background-color: var(--bg-card);
    border-right: 1px solid var(--border-color); padding: 2.5rem 1.5rem;
    overflow-y: auto; flex-shrink: 0;
}
.close-course-btn {
    background: transparent; border: none; color: var(--text-secondary);
    cursor: pointer; display: flex; align-items: center; gap: 0.5rem;
    margin-bottom: 2.5rem; font-family: var(--font-sans); font-size: 1rem;
    transition: color var(--transition-normal);
}
.close-course-btn:hover { color: var(--accent-primary); text-shadow: 0 0 8px var(--accent-glow); }
.sidebar-title { font-family: var(--font-mono); color: var(--accent-secondary); font-size: 1.1rem; margin-bottom: 1.5rem; text-transform: uppercase; }
.module-nav li { margin-bottom: 0.5rem; }
.module-nav a {
    display: block; padding: 0.8rem 1rem; border-radius: 6px;
    color: var(--text-primary); font-size: 0.95rem; border: 1px solid transparent;
}
.module-nav a:hover, .module-nav a.active {
    background-color: var(--glass-bg); border-color: var(--accent-primary);
    color: var(--accent-primary); box-shadow: inset 2px 0 0 var(--accent-primary);
}
.course-content-area {
    flex: 1; padding: 4rem 5%; overflow-y: auto;
    background-color: rgba(0, 0, 0, 0.45); /* Tummennus varmistamaan luettavuus */
    background-image: radial-gradient(circle at center, var(--accent-glow) 0%, transparent 70%);
    background-size: 100vw 100vh; background-attachment: fixed; background-position: center;
}

/* Markdown Render Styles */
.markdown-body { max-width: 960px; margin: 0 auto; line-height: 1.7; font-size: 1.1rem; }
.markdown-body h1 { color: var(--accent-primary); font-size: 2.8rem; margin-bottom: 0.5rem; text-shadow: 0 0 15px var(--accent-glow); }
.markdown-body h2 { color: var(--text-primary); font-size: 1.8rem; margin-top: 3rem; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border-color); }
.markdown-body h3 { color: var(--accent-secondary); font-size: 1.4rem; margin-top: 2rem; margin-bottom: 1rem; }
.markdown-body p { margin-bottom: 1.5rem; color: var(--text-secondary); }
.markdown-body ul, .markdown-body ol { margin-bottom: 1.5rem; padding-left: 2rem; color: var(--text-secondary); }
.markdown-body li { margin-bottom: 0.5rem; }
.markdown-body strong { color: var(--text-primary); font-weight: 700; }
.markdown-body code {
    background-color: var(--bg-terminal); padding: 0.2rem 0.4rem;
    border-radius: 4px; border: 1px solid var(--border-color);
    font-family: var(--font-mono); font-size: 0.9em;
    color: var(--accent-secondary);
}
.markdown-body pre {
    border-radius: 8px; border: 1px solid var(--border-color);
    overflow-x: auto; margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.markdown-body pre code {
    font-size: 0.95em; line-height: 1.5; padding: 1.5rem;
    font-family: var(--font-mono); display: block; white-space: pre-wrap; word-break: break-word;
}

/* Content Lock Overlay */
.content-lock-overlay {
    position: relative;
    margin-top: -6rem;
    padding-top: 8rem;
    padding-bottom: 4rem;
    text-align: center;
    background: linear-gradient(to bottom, transparent 0%, var(--bg-main) 30%);
}
.lock-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: grayscale(1) brightness(1.5);
}
.content-lock-overlay h3 {
    color: var(--text-primary);
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
}
.content-lock-overlay p {
    color: var(--text-secondary);
    max-width: 480px;
    margin: 0 auto 1.5rem;
    line-height: 1.6;
}
.lock-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}
.lock-cta {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-main);
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.lock-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}
.lock-cta-secondary {
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
}
.lock-cta-secondary:hover {
    background-color: var(--accent-primary);
    color: var(--bg-main);
}

/* Code Copy Button */
.code-copy-btn {
    position: absolute; top: 0.5rem; right: 0.5rem;
    background-color: var(--bg-card); border: 1px solid var(--border-color);
    color: var(--text-secondary); font-family: var(--font-mono); font-size: 0.7rem;
    padding: 0.25rem 0.6rem; border-radius: 4px; cursor: pointer;
    opacity: 0; transition: opacity var(--transition-normal), background-color var(--transition-normal);
    text-transform: uppercase; letter-spacing: 0.05em;
}
pre:hover .code-copy-btn { opacity: 1; }
.code-copy-btn:hover { background-color: var(--accent-primary); color: var(--bg-main); border-color: var(--accent-primary); }
.code-copy-btn.copied { background-color: var(--accent-secondary); color: var(--bg-main); border-color: var(--accent-secondary); opacity: 1; }

/* Markdown Tables */
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    font-size: 0.95rem;
}
.markdown-body th, .markdown-body td {
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    text-align: left;
}
.markdown-body th {
    background-color: var(--bg-alt);
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.markdown-body tr:nth-child(even) {
    background-color: rgba(255, 255, 255, 0.02);
}
.markdown-body tr:hover {
    background-color: var(--accent-glow);
}

/* --- Blog Styles --- */

.markdown-body.blog-view h1 {
    font-size: 2.4rem;
    margin-bottom: 0.3rem;
}
.markdown-body.blog-view h1::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    margin-top: 0.8rem;
    border-radius: 2px;
}
.blog-intro {
    font-size: 1.15rem;
    color: var(--text-secondary);
    font-style: italic;
    border-left: 3px solid var(--accent-primary);
    padding-left: 1rem;
    margin-bottom: 2.5rem;
}
.markdown-body.blog-view hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), var(--accent-primary), var(--border-color), transparent);
    margin: 3rem 0;
}
.blog-post-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.2rem;
}
.blog-date {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-main);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    letter-spacing: 0.03em;
    white-space: nowrap;
    flex-shrink: 0;
}
.blog-time {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
    white-space: nowrap;
}
.markdown-body.blog-view h2 {
    font-size: 1.6rem;
    border-bottom: none;
    margin-top: 0;
    padding-bottom: 0;
    color: var(--text-primary);
}
.blog-post-body {
    border-left: 2px solid var(--border-color);
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    transition: border-color var(--transition-normal);
}
.blog-post-body:hover {
    border-left-color: var(--accent-primary);
}
.blog-post-body ol {
    counter-reset: blog-step;
    list-style: none;
    padding-left: 0;
}
.blog-post-body ol > li {
    counter-increment: blog-step;
    position: relative;
    padding-left: 2.5rem;
    margin-bottom: 1.2rem;
}
.blog-post-body ol > li::before {
    content: counter(blog-step);
    position: absolute;
    left: 0;
    top: 0.1em;
    width: 1.6rem;
    height: 1.6rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
}
.blog-tag {
    display: inline-block;
    background-color: var(--glass-bg);
    border: 1px solid var(--border-color);
    color: var(--accent-secondary);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    margin-right: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --- Media Queries (MUST BE LAST) --- */

@media (max-width: 992px) {
    .hero-container { grid-template-columns: 1fr; padding-top: 4rem; text-align: center; }
    .hero-actions, .hero-stats { justify-content: center; }
    .terminal-window { max-width: 600px; margin: 0 auto; text-align: left; }
    .footer-container { grid-template-columns: 1fr 1fr; }
    .theme-img-wrapper {
        position: relative; top: auto; right: auto;
        width: 250px; height: 250px; margin: 0 auto 2rem;
    }
}

@media (max-width: 768px) {
    .desktop-nav, .nav-cta { display: none; }
    .mobile-menu-btn { display: block; }
    
    /* Layout stacking */
    .course-env { 
        flex-direction: column !important; 
    }
    .course-sidebar { 
        width: 100% !important; 
        max-width: 100% !important;
        border-right: none !important; 
        border-bottom: 1px solid var(--border-color) !important; 
        padding: 1.5rem !important; 
        max-height: 35vh !important; 
        overflow-y: auto !important; 
        flex: none !important;
    }
    .course-content-area { 
        width: 100% !important;
        padding: 2rem 1rem !important; 
        flex: 1 !important;
    }
    
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn { width: 100%; max-width: 300px; }
    .cta-desc { font-size: 1rem; }
    .theme-img-wrapper { width: 180px; height: 180px; }
    
    .footer-container { grid-template-columns: 1fr; text-align: center; }
    .footer-desc { margin-left: auto; margin-right: auto; }
}

@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .section-padding { padding: 3.5rem 0; }
    .hero { padding-top: 80px; }
    .hero-stats { gap: 1.5rem; }
    .stat-value { font-size: 1.5rem; }
    .module-card { padding: 1.5rem; }
    .terminal-window { font-size: 0.75rem; }
    .terminal-body { padding: 1rem; min-height: 150px; }
    .theme-img-wrapper { width: 140px; height: 140px; }
}