/* ==========================================
   ZERONETWORKING - MAIN STYLESHEET
   ========================================== */
/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Backgrounds - Pure Black */
    --bg-primary:    #000000;
    --bg-secondary:  #0a0a0a;
    --bg-card:       #1a1a1a;
    --bg-card-hover: #242424;

    /* Accent Colors - Whites/Grays only, no neon */
    --accent-primary:   #ffffff;
    --accent-secondary: #cccccc;

    /* Text */
    --text-primary:   #ffffff;
    --text-secondary: #cccccc;
    --text-muted:     #808080;

    /* Borders */
    --border-primary:   #333333;
    --border-secondary: #666666;
    --border-accent:    #ffffff;
    --border-subtle:    #1a1a1a;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;

    /* Transitions - Faster for retro feel */
    --transition-fast:   0.1s ease;
    --transition-normal: 0.2s ease;
}

body {
    font-family: 'Courier New', 'Consolas', monospace;
    background: #000000;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
}

/* Matrix rain canvas
   Injected by rain.js always fixed, full-screen, behind all content */
#rain-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

a {
    color: var(--accent-secondary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

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

/* === HEADER & NAVIGATION === */
header {
    background: rgba(0, 0, 0, 0.92);
    border-bottom: 1px solid var(--border-accent);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    font-family: 'Courier New', 'Consolas', monospace;
    font-size: 1rem;
    font-weight: bold;
    color: var(--accent-primary);
    text-decoration: none;
    letter-spacing: 2px;
    border: 1px solid var(--border-accent);
    padding: 0.3rem 0.8rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 0;
}

nav a {
    color: var(--text-primary);
    font-weight: normal;
    padding: 0.5rem 1rem;
    transition: all var(--transition-fast);
    border-right: 1px solid var(--border-primary);
    font-size: 0.85rem;
    letter-spacing: 1px;
}

nav ul li:last-child a { border-right: none; }

nav a:hover,
nav a.active {
    color: var(--bg-primary);
    background: var(--text-primary);
}

/* === LANGUAGE TOGGLE === */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: transparent;
    border: 1px solid var(--border-secondary);
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    letter-spacing: 1px;
    padding: 0.3rem 0.7rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    white-space: nowrap;
    flex-shrink: 0;
}

.lang-toggle:hover {
    border-color: var(--border-accent);
    color: var(--text-primary);
    background: var(--bg-card);
}

.flag-icon {
    font-size: 1rem;
    line-height: 1;
}

.lang-label {
    font-size: 0.7rem;
    letter-spacing: 2px;
}

/* === CONTAINER & LAYOUT === */
.element{
    overflow: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.hero {
    max-width: 1200px;
    margin: auto;
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    border-bottom: 1px solid var(--border-primary);
    background: rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 1;
}

.hero h1 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: bold;
    letter-spacing: 3px;
}

.hero p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* === PROFILE AVATAR === */
.profile-avatar {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 1rem;
}

.profile-avatar img {
    clip-path: circle(75% at center);
}

/* === CARDS === */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: 0;
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
    position: relative;
}

.card::before { display: none; }

.card:hover {
    transform: none;
    border-color: var(--border-accent);
    box-shadow: none;
    background: var(--bg-card-hover);
}

.card-icon { display: none; }

.card h3 {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 1px;
    font-size: 1rem;
    border-bottom: 1px solid var(--border-primary);
    padding-bottom: 0.5rem;
}

.card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* === GRID LAYOUTS === */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--spacing-md); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: var(--spacing-md); }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: var(--spacing-md); }

/* === SECTIONS === */
.section { margin-bottom: var(--spacing-lg); }

.section-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-primary);
    border: 1px solid var(--border-secondary);
    border-left: 3px solid var(--border-accent);
    padding: 0.5rem 1rem;
    letter-spacing: 2px;
    background: var(--bg-card);
}

/* === BUTTONS === */
.btn {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border: 1px solid var(--border-accent);
    border-radius: 0;
    color: var(--text-primary);
    background: var(--bg-card);
    font-weight: normal;
    cursor: pointer;
    transition: all var(--transition-fast);
    letter-spacing: 1px;
    font-size: 0.85rem;
    font-family: 'Courier New', monospace;
}

.btn:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    border-color: var(--border-secondary);
    color: var(--text-secondary);
}

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

/* === BADGES === */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 0;
    font-size: 0.75rem;
    font-weight: normal;
    letter-spacing: 1px;
    border: 1px solid;
}

.badge-primary   { color: var(--text-primary);   border-color: var(--text-primary); }
.badge-secondary { color: var(--text-secondary); border-color: var(--text-secondary); }
.badge-muted     { color: var(--text-muted);     border-color: var(--text-muted); }

/* === CODE BLOCKS === */
code {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 0.2rem 0.5rem;
    border-radius: 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    border: 1px solid var(--border-primary);
}

pre {
    background: #000000;
    border: 1px solid var(--border-secondary);
    border-left: 3px solid var(--border-accent);
    padding: 1rem;
    border-radius: 0;
    overflow-x: auto;
    margin: 0; /* header sits directly above, no gap */
}

pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    border: none;
}

/* ── Code block header (language label + copy button) ────────────────
   Injected by CopyCode class in main.js */
.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-left: 3px solid var(--border-accent);
    border-bottom: none;
    padding: 0.35rem 0.8rem;
    margin-top: var(--spacing-sm);
}

.code-language {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
}

.copy-button {
    background: transparent;
    border: 1px solid var(--border-primary);
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
    font-size: 0.7rem;
    letter-spacing: 1px;
    padding: 0.15rem 0.6rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-button:hover {
    border-color: var(--border-accent);
    color: var(--text-primary);
}

.copy-button.copied {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* === READING PROGRESS BAR ───────────────────────────────────────────
   Injected by ReadingProgressBar class in main.js on article pages */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--bg-card);
    z-index: 2000;
    pointer-events: none;
}

.reading-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--text-primary);
    transition: width 0.1s linear;
}

/* === BACK-TO-TOP BUTTON ─────────────────────────────────────────────
   Injected by BackToTop class in main.js */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    width: 2.2rem;
    height: 2.2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    color: var(--text-secondary);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    display: flex;
    align-items: center;
    justify-content: center;

    /* Hidden by default — shown via .visible */
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal), border-color var(--transition-fast), color var(--transition-fast);
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    border-color: var(--border-accent);
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

/* === FOOTER === */
footer {
    background: rgba(0, 0, 0, 0.92);
    border-top: 1px solid var(--border-accent);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-muted);
    margin-top: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-top: var(--spacing-sm);
}

.social-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
    transition: color var(--transition-fast);
    padding: 0.5rem 1rem;
    border-right: 1px solid var(--border-primary);
    letter-spacing: 1px;
    text-decoration: none;
}

.social-links a:last-child { border-right: none; }

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

/* === UTILITIES === */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
    :root { font-size: 14px; }

    nav {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-sm);
    }

    .hero h1 { font-size: 2rem; }

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

    .back-to-top {
        bottom: 1rem;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .container,
    .hero { padding: var(--spacing-sm); }
}