/**
 * CyberSec Course — Unified Design System & Theme Stylesheet
 * Standardized for all 39 course modules and index dashboard.
 */

:root {
    /* Base Backgrounds */
    --bg-dark: #0a0e1a;
    --bg-deep: #060913;
    --bg-card: #111827;
    --bg-card-hover: #1e293b;
    --bg-glass: rgba(17, 24, 39, 0.75);
    --bg-glass-strong: rgba(17, 24, 39, 0.92);
    --bg-glass-light: rgba(30, 41, 59, 0.5);

    /* Borders */
    --border-glass: rgba(6, 182, 212, 0.2);
    --border-glass-hover: rgba(6, 182, 212, 0.45);
    --border-subtle: rgba(255, 255, 255, 0.08);

    /* Text Colors */
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --text-accent: #38bdf8;

    /* Category & Accent Palette */
    --cyber-cyan: #06b6d4;
    --cyber-blue: #3b82f6;
    --cyber-purple: #8b5cf6;
    --cyber-green: #10b981;
    --cyber-amber: #f59e0b;
    --cyber-red: #ef4444;
    --cyber-pink: #ec4899;
    --cyber-indigo: #6366f1;
    --cyber-orange: #f97316;

    /* Glows & Shadows */
    --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    --shadow-glow-cyan: 0 0 25px rgba(6, 182, 212, 0.25);
    --shadow-glow-purple: 0 0 25px rgba(139, 92, 246, 0.25);
    --shadow-glow-green: 0 0 25px rgba(16, 185, 129, 0.25);
    --shadow-glow-red: 0 0 25px rgba(239, 68, 68, 0.25);
    --shadow-glow-amber: 0 0 25px rgba(245, 158, 11, 0.25);
}

/* ==========================================================================
   Base & Typography
   ========================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    color-scheme: dark;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Fira Sans', system-ui, sans-serif;
    letter-spacing: -0.01em;
    font-weight: 700;
}

code, pre, kbd, samp, .font-mono {
    font-family: 'JetBrains Mono', monospace;
}

/* Inline code style */
:not(pre) > code {
    background: rgba(6, 182, 212, 0.1);
    color: #38bdf8;
    border: 1px solid rgba(6, 182, 212, 0.2);
    padding: 0.15em 0.4em;
    border-radius: 0.375rem;
    font-size: 0.875em;
}

/* ==========================================================================
   Unified Ambient Background & Grid
   ========================================================================== */

.cyber-ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background:
        radial-gradient(ellipse at 15% 15%, rgba(6, 182, 212, 0.12) 0%, transparent 45%),
        radial-gradient(ellipse at 85% 80%, rgba(139, 92, 246, 0.12) 0%, transparent 45%),
        radial-gradient(ellipse at 50% 50%, rgba(16, 185, 129, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

.cyber-grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image:
        linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

/* ==========================================================================
   Unified Header & Navigation
   ========================================================================== */

.cyber-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--bg-glass-strong);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-glass);
    padding: 0.875rem 1.5rem;
    transition: all 0.3s ease;
}

.cyber-nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.cyber-nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.cyber-nav-home-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: 0.625rem;
    color: #e0f2fe;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.cyber-nav-home-btn:hover {
    background: rgba(6, 182, 212, 0.25);
    border-color: var(--cyber-cyan);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
    transform: translateY(-1px);
    color: #fff;
}

.cyber-nav-breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.cyber-nav-separator {
    color: var(--text-muted);
}

.cyber-nav-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.cyber-nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.cyber-nav-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    padding: 0.25rem 0.625rem;
    border-radius: 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.cyber-nav-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 9999px;
    background-color: #10b981;
    box-shadow: 0 0 8px #10b981;
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@media (max-width: 640px) {
    .cyber-nav-right {
        display: none;
    }
}

/* ==========================================================================
   Badges
   ========================================================================== */

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1;
}

.badge-beginner, .badge.beginner {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-intermediate, .badge.intermediate {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-advanced, .badge.advanced {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-expert, .badge.expert {
    background: rgba(139, 92, 246, 0.15);
    color: #a78bfa;
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-cyan {
    background: rgba(6, 182, 212, 0.15);
    color: #38bdf8;
    border: 1px solid rgba(6, 182, 212, 0.3);
}

.badge-purple {
    background: rgba(139, 92, 246, 0.15);
    color: #c084fc;
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-pink {
    background: rgba(236, 72, 153, 0.15);
    color: #f472b6;
    border: 1px solid rgba(236, 72, 153, 0.3);
}

/* ==========================================================================
   Cards & Glass Surfaces
   ========================================================================== */

.cyber-card, .glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.cyber-card:hover, .glass-card:hover {
    border-color: var(--border-glass-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card), var(--shadow-glow-cyan);
}

.cyber-card.purple:hover {
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: var(--shadow-card), var(--shadow-glow-purple);
}

.cyber-card.green:hover {
    border-color: rgba(16, 185, 129, 0.5);
    box-shadow: var(--shadow-card), var(--shadow-glow-green);
}

.cyber-card.red:hover {
    border-color: rgba(239, 68, 68, 0.5);
    box-shadow: var(--shadow-card), var(--shadow-glow-red);
}

.cyber-card.amber:hover {
    border-color: rgba(245, 158, 11, 0.5);
    box-shadow: var(--shadow-card), var(--shadow-glow-amber);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn-cyber-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: #ffffff;
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: 0.625rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

.btn-cyber-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.5);
    filter: brightness(1.1);
}

.btn-cyber-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: rgba(30, 41, 59, 0.8);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.12);
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: 0.625rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.25s ease;
}

.btn-cyber-secondary:hover {
    background: rgba(51, 65, 85, 0.9);
    border-color: var(--cyber-cyan);
    color: #fff;
    transform: translateY(-2px);
}

/* ==========================================================================
   Callouts & Alerts
   ========================================================================== */

.cyber-alert {
    padding: 1rem 1.25rem;
    border-radius: 0.75rem;
    margin: 1rem 0;
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    border-left: 4px solid;
    background: rgba(17, 24, 39, 0.8);
}

.cyber-alert-info {
    border-color: var(--cyber-cyan);
    background: rgba(6, 182, 212, 0.08);
}

.cyber-alert-warning {
    border-color: var(--cyber-amber);
    background: rgba(245, 158, 11, 0.08);
}

.cyber-alert-danger {
    border-color: var(--cyber-red);
    background: rgba(239, 68, 68, 0.08);
}

.cyber-alert-success {
    border-color: var(--cyber-green);
    background: rgba(16, 185, 129, 0.08);
}

/* ==========================================================================
   Unified Footer
   ========================================================================== */

.cyber-footer {
    margin-top: 4rem;
    padding: 2.5rem 1rem;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.cyber-footer a {
    color: var(--cyber-cyan);
    text-decoration: none;
    transition: color 0.2s ease;
}

.cyber-footer a:hover {
    color: #38bdf8;
    text-decoration: underline;
}

.cyber-footer-sub {
    font-size: 0.75rem;
    color: #4b5563;
    margin-top: 0.35rem;
}

/* ==========================================================================
   Scrollbar
   ========================================================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: rgba(6, 182, 212, 0.35);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--cyber-cyan);
}