/* ==========================================================================
   1. Theme Variables
   ========================================================================== */

:root {
    /* Dark theme (default) */
    --bg-primary: #0b0e17;
    --bg-surface: #111827;
    --bg-elevated: #1a2235;
    --bg-inset: #080b12;
    --border: #1e2a3f;
    --border-hover: #2a3a55;

    --text-primary: #c8d0e0;
    --text-secondary: #6a7a95;
    --text-muted: #3a4a65;

    --accent: #00d4ff;
    --accent-glow: rgba(0, 212, 255, 0.15);
    --accent-glow-strong: rgba(0, 212, 255, 0.3);
    --accent-secondary: #00ff9f;
    --accent-secondary-glow: rgba(0, 255, 159, 0.15);
    --accent-warm: #ffb000;
    --accent-danger: #ff4455;

    --grid-dot: rgba(0, 212, 255, 0.04);
    --scanline-alpha: 0.025;
    --selection-bg: #00d4ff;
    --selection-text: #0b0e17;

    --font-display: 'Orbitron', sans-serif;
    --font-body: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
    --bg-primary: #e4e8ec;
    --bg-surface: #edf0f4;
    --bg-elevated: #f8f9fb;
    --bg-inset: #d8dce2;
    --border: #bcc4d0;
    --border-hover: #a0aab8;

    --text-primary: #0f1724;
    --text-secondary: #4a5568;
    --text-muted: #8a95a5;

    --accent: #0088b0;
    --accent-glow: rgba(0, 136, 176, 0.1);
    --accent-glow-strong: rgba(0, 136, 176, 0.2);
    --accent-secondary: #008855;
    --accent-secondary-glow: rgba(0, 136, 85, 0.1);
    --accent-warm: #b07800;
    --accent-danger: #cc2233;

    --grid-dot: rgba(0, 0, 0, 0.03);
    --scanline-alpha: 0;
    --selection-bg: #0088b0;
    --selection-text: #ffffff;
}

/* ==========================================================================
   2. Base
   ========================================================================== */

::selection {
    background: var(--selection-bg);
    color: var(--selection-text);
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-hover) var(--bg-primary);
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-hover); }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

body {
    background-color: var(--bg-primary);
    background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
    background-size: 28px 28px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   3. CRT Scanlines
   ========================================================================== */

body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 10000;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 1px,
        rgba(0, 0, 0, var(--scanline-alpha)) 1px,
        rgba(0, 0, 0, var(--scanline-alpha)) 2px
    );
}

/* ==========================================================================
   4. Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.label {
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.glow {
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent-glow-strong);
}

.glow-green {
    color: var(--accent-secondary);
    text-shadow: 0 0 10px var(--accent-secondary-glow);
}

/* ==========================================================================
   5. Navigation
   ========================================================================== */

.site-nav {
    position: relative;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 60ms, text-shadow 60ms;
}

.nav-brand:hover {
    color: var(--accent);
    text-shadow: 0 0 12px var(--accent-glow-strong);
}

.nav-link {
    position: relative;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    text-decoration: none;
    padding-bottom: 2px;
    transition: color 60ms;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    box-shadow: 0 0 6px var(--accent-glow-strong);
    transition: width 80ms linear;
}

.nav-link:hover {
    color: var(--accent);
}

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

.nav-disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

/* Mobile menu */
.mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    z-index: 40;
    overflow: hidden;
    max-height: 0;
    transition: max-height 150ms ease-out;
}

.mobile-menu.mobile-menu-open {
    max-height: 16rem;
}

.mobile-nav-link {
    display: block;
    padding: 0.6rem 0;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 60ms;
}

.mobile-nav-link::before {
    content: '> ';
    color: var(--text-muted);
    transition: color 60ms;
}

.mobile-nav-link:hover {
    color: var(--accent);
}

.mobile-nav-link:hover::before {
    color: var(--accent);
}

/* ==========================================================================
   6. Buttons
   ========================================================================== */

.btn {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    padding: 0.65rem 1.5rem;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 60ms, color 60ms, background 60ms, box-shadow 60ms, transform 50ms linear;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.btn:active {
    transform: scale(0.97);
    background: color-mix(in srgb, var(--bg-elevated) 85%, var(--accent));
}

.btn-primary {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-primary:hover {
    background: color-mix(in srgb, var(--bg-elevated) 80%, var(--accent));
    box-shadow: 0 0 18px var(--accent-glow);
}

/* ==========================================================================
   7. Cards
   ========================================================================== */

.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 60ms, box-shadow 60ms;
}

.card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow), inset 0 0 20px rgba(0, 212, 255, 0.02);
}

.card a {
    text-decoration: none;
    color: inherit;
}

.card-body {
    padding: 1.25rem;
}

.card-title {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.card-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.card-img {
    width: 100%;
    height: 12rem;
    object-fit: cover;
    display: block;
    border-bottom: 1px solid var(--border);
}

/* ==========================================================================
   8. Terminal Panel
   ========================================================================== */

.panel {
    background: var(--bg-surface);
    border: 1px solid var(--border);
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.panel-header::before {
    content: '///';
    color: var(--accent);
    opacity: 0.5;
}

.panel-body {
    padding: 1.5rem;
}

/* ==========================================================================
   9. Forms
   ========================================================================== */

.terminal-form label {
    display: block;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.terminal-form input[type="text"],
.terminal-form input[type="email"],
.terminal-form input[type="url"],
.terminal-form input[type="password"],
.terminal-form textarea,
.terminal-form select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--text-primary);
    background: var(--bg-inset);
    border: 1px solid var(--border);
    outline: none;
    transition: border-color 60ms, box-shadow 60ms;
}

.terminal-form input:focus,
.terminal-form textarea:focus,
.terminal-form select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.terminal-form input::placeholder,
.terminal-form textarea::placeholder {
    color: var(--text-muted);
}

.terminal-form .error-text {
    font-size: 0.75rem;
    color: var(--accent-danger);
    margin-top: 0.3rem;
}

/* ==========================================================================
   10. Tags & Badges
   ========================================================================== */

.tag {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.2rem 0.55rem;
    border: 1px solid var(--border);
    color: var(--accent);
    background: transparent;
    text-decoration: none;
    transition: border-color 60ms, background 60ms, box-shadow 60ms;
}

.tag:hover {
    border-color: var(--accent);
    background: color-mix(in srgb, transparent 85%, var(--accent));
    box-shadow: 0 0 8px var(--accent-glow);
}

.tag-solid {
    background: color-mix(in srgb, var(--bg-elevated) 80%, var(--accent));
    border-color: color-mix(in srgb, var(--border) 60%, var(--accent));
    color: var(--accent);
}

/* ==========================================================================
   11. Content Body (rich text for blog/project)
   ========================================================================== */

.content-body {
    font-size: 0.95rem;
    line-height: 1.85;
    color: var(--text-secondary);
}

.content-body p {
    margin-bottom: 1.5em;
}

.content-body h2 {
    font-size: 1.4rem;
    margin: 2.5em 0 0.8em;
    color: var(--text-primary);
}

.content-body h3 {
    font-size: 1.15rem;
    margin: 2em 0 0.6em;
    color: var(--text-primary);
}

.content-body a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: text-shadow 60ms;
}

.content-body a:hover {
    text-shadow: 0 0 8px var(--accent-glow-strong);
}

.content-body ul,
.content-body ol {
    margin-bottom: 1.5em;
    padding-left: 1.5em;
}

.content-body li {
    margin-bottom: 0.4em;
}

.content-body blockquote {
    border-left: 2px solid var(--accent);
    padding-left: 1em;
    margin: 1.5em 0;
    color: var(--text-muted);
    font-style: italic;
}

.content-body code {
    font-family: var(--font-body);
    font-size: 0.85em;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    padding: 0.15em 0.4em;
}

.content-body pre {
    background: var(--bg-inset);
    border: 1px solid var(--border);
    padding: 1.25em;
    overflow-x: auto;
    margin: 1.5em 0;
}

.content-body pre code {
    background: none;
    border: none;
    padding: 0;
}

.content-body img {
    max-width: 100%;
    border: 1px solid var(--border);
    margin: 1.5em 0;
    display: block;
}

.content-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2em 0;
}

/* ==========================================================================
   12. Hero
   ========================================================================== */

.hero {
    border-bottom: 1px solid var(--border);
}

.hero-heading {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-primary);
    animation: crtFlicker 0.5s ease-out;
}

.hero-sub {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 38rem;
}

.cursor-blink {
    display: inline-block;
    width: 0.55em;
    height: 1.15em;
    background: var(--accent);
    vertical-align: text-bottom;
    margin-left: 0.15em;
    animation: blink 1s steps(1) infinite;
}

/* ==========================================================================
   13. Section Dividers
   ========================================================================== */

.section-heading {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.section-heading span {
    color: var(--accent);
    margin-right: 0.5em;
    opacity: 0.6;
}

/* ==========================================================================
   14. Footer
   ========================================================================== */

.site-footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
}

.site-footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 60ms;
}

.site-footer a:hover {
    color: var(--accent);
}

/* ==========================================================================
   15. Messages (Django messages framework)
   ========================================================================== */

.msg {
    font-size: 0.8rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.msg::before {
    font-weight: 700;
    margin-right: 0.5em;
    letter-spacing: 0.06em;
}

.msg-success {
    border-color: var(--accent-secondary);
    color: var(--accent-secondary);
}
.msg-success::before { content: '[OK]'; }

.msg-error {
    border-color: var(--accent-danger);
    color: var(--accent-danger);
}
.msg-error::before { content: '[ERR]'; }

.msg-info {
    border-color: var(--accent);
    color: var(--accent);
}
.msg-info::before { content: '[SYS]'; }

/* ==========================================================================
   16. Theme Toggle
   ========================================================================== */

.theme-toggle {
    font-family: var(--font-body);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.35rem 0.65rem;
    color: var(--text-muted);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color 60ms, color 60ms, transform 50ms linear;
}

.theme-toggle:hover {
    border-color: var(--accent-warm);
    color: var(--accent-warm);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* ==========================================================================
   17. Pagination
   ========================================================================== */

.page-link {
    display: inline-block;
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    font-family: var(--font-body);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    background: var(--bg-surface);
    text-decoration: none;
    transition: border-color 60ms, color 60ms, transform 50ms linear;
}

.page-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.page-link:active {
    transform: scale(0.95);
}

.page-link-active {
    border-color: var(--accent);
    color: var(--accent);
    background: color-mix(in srgb, var(--bg-surface) 80%, var(--accent));
}

/* ==========================================================================
   18. Certification Cards
   ========================================================================== */

.cert-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    transition: border-color 60ms;
}

.cert-card:hover {
    border-color: var(--accent-warm);
}

.cert-badge {
    width: 3.5rem;
    height: 3.5rem;
    object-fit: contain;
    flex-shrink: 0;
}

.cert-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.cert-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.cert-link {
    font-size: 0.7rem;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: text-shadow 60ms;
}

.cert-link:hover {
    text-shadow: 0 0 6px var(--accent-glow-strong);
}

/* ==========================================================================
   19. Quote Ticker
   ========================================================================== */

.ticker-section {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg-surface);
    overflow: hidden;
}

.ticker-track {
    position: relative;
    padding: 0.85rem 0;
    mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
}

.ticker-content {
    display: flex;
    gap: 0;
    width: max-content;
    animation: tickerScroll 40s linear infinite;
}

.ticker-content:hover {
    animation-play-state: paused;
}

.ticker-item {
    display: flex;
    align-items: center;
    gap: 0.6em;
    white-space: nowrap;
    padding: 0 2rem;
    flex-shrink: 0;
}

.ticker-divider {
    color: var(--accent);
    opacity: 0.4;
    font-weight: 700;
    font-size: 0.75rem;
}

.ticker-text {
    font-size: 0.8rem;
    font-style: italic;
    color: var(--text-secondary);
}

.ticker-author {
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
}

@keyframes tickerScroll {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ==========================================================================
   20. Quote Box
   ========================================================================== */

.quote-anchor {
    position: relative;
    min-height: 12rem;
}

.quote-box {
    position: absolute;
    top: 0;
    left: 1rem;
    right: 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
}

.quote-stage {
    position: relative;
}

.quote-slide {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    opacity: 0;
    transition: opacity 150ms linear;
    pointer-events: none;
}

.quote-slide.quote-active {
    position: relative;
}

.quote-slide.quote-active {
    opacity: 1;
    pointer-events: auto;
}

.quote-text {
    font-size: 0.85rem;
    font-style: italic;
    color: var(--text-primary);
    text-align: center;
    line-height: 1.5;
}

@media (min-width: 768px) {
    .quote-slide {
        padding: 2.5rem;
    }
    .quote-text {
        font-size: 1rem;
        line-height: 1.7;
    }
}

.quote-author {
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-top: 0.75rem;
}

.quote-pips {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 0 2rem 1.25rem;
}

.quote-pip {
    width: 6px;
    height: 6px;
    border: 1px solid var(--border-hover);
    background: transparent;
    cursor: pointer;
    padding: 0;
    transition: background 60ms, border-color 60ms;
}

.quote-pip:hover {
    border-color: var(--accent);
}

.quote-pip-active {
    background: var(--accent);
    border-color: var(--accent);
}

/* ==========================================================================
   21. Animations
   ========================================================================== */

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes crtFlicker {
    0%   { opacity: 0; filter: brightness(0.3); }
    15%  { opacity: 1; filter: brightness(1.6); }
    20%  { opacity: 0.7; filter: brightness(0.9); }
    30%  { opacity: 1; filter: brightness(1.2); }
    100% { opacity: 1; filter: brightness(1); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.animate-in {
    animation: fadeIn 0.3s ease-out both;
}

.delay-1 { animation-delay: 0.06s; }
.delay-2 { animation-delay: 0.12s; }
.delay-3 { animation-delay: 0.18s; }
.delay-4 { animation-delay: 0.24s; }
.delay-5 { animation-delay: 0.30s; }

/* ==========================================================================
   20. Utilities
   ========================================================================== */

.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.border-accent { border-color: var(--accent); }
.bg-surface { background: var(--bg-surface); }
.bg-elevated { background: var(--bg-elevated); }

.back-link {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-decoration: none;
    letter-spacing: 0.04em;
    transition: color 60ms;
}

.back-link:hover {
    color: var(--accent);
}

.back-link::before {
    content: '\2190\00a0';
}

/* Hamburger icon */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 6px;
    background: none;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color 60ms;
}

.hamburger:hover { border-color: var(--accent); }
.hamburger:active { transform: scale(0.93); }

.hamburger span {
    display: block;
    width: 16px;
    height: 1.5px;
    background: var(--text-secondary);
    transition: background 60ms, transform 120ms ease-out, opacity 80ms ease-out;
    transform-origin: center;
}

.hamburger:hover span { background: var(--accent); }

.hamburger-open span:nth-child(1) {
    transform: translateY(5.5px) rotate(45deg);
}

.hamburger-open span:nth-child(2) {
    opacity: 0;
}

.hamburger-open span:nth-child(3) {
    transform: translateY(-5.5px) rotate(-45deg);
}