/* ===========================================
   TOKENS
   =========================================== */
:root {
  --bg:          #0b0b10;
  --bg-card:     #111118;
  --bg-card-h:   #16161f;
  --bg-surface:  #0e0e14;
  --border:      #1c1c28;
  --border-h:    #2a2a38;
  --text:        #d8d8e4;
  --text-mid:    #8c8ca2;
  --text-dim:    #4e4e62;
  --accent:      #4d8bff;
  --accent-h:    #6da1ff;
  --accent-dim:  rgba(77,139,255,0.08);
  --purple:      #7b5cff;
  --green:       #2dd4a8;
  --orange:      #f59e42;
  --red:         #ef4444;
  --font:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:        'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --max-w:       1080px;
  --px:          24px;
  --radius:      8px;
  --radius-lg:   14px;
}

/* ===========================================
   RESET
   =========================================== */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-font-smoothing:antialiased; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }
a { color:inherit; text-decoration:none; }
ul { list-style:none; }
img { max-width:100%; display:block; }
::selection { background:rgba(77,139,255,0.2); color:#fff; }

/* ===========================================
   LAYOUT
   =========================================== */
.container { max-width:var(--max-w); margin:0 auto; padding:0 var(--px); }

/* ===========================================
   NAV
   =========================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,11,16,0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--px);
  display: flex;
  align-items: center;
  height: 60px;
}
.nav-logo {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-right: auto;
}
.nav-logo span { color: var(--accent); }
.nav-links { display:flex; gap:6px; }
.nav-links a {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 6px;
  transition: color 150ms, background 150ms;
}
.nav-links a:hover { color: var(--text-mid); }
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-dim);
}
.nav-toggle {
  display: none;
  background:none; border:none; cursor:pointer;
  padding:6px; flex-direction:column; gap:5px;
}
.nav-toggle span {
  display:block; width:20px; height:1.5px;
  background:var(--text); border-radius:1px;
  transition: all 200ms;
}
.nav-toggle.open span:first-child { transform:rotate(45deg) translate(2.5px,2.5px); }
.nav-toggle.open span:last-child  { transform:rotate(-45deg) translate(2.5px,-2.5px); }

/* ===========================================
   BUTTONS
   =========================================== */
.btn {
  display:inline-flex; align-items:center; gap:6px;
  padding:11px 22px; border-radius:var(--radius);
  font-family:var(--font); font-size:0.85rem; font-weight:600;
  cursor:pointer; border:none;
  transition: all 180ms ease;
}
.btn-primary { background:var(--accent); color:#fff; }
.btn-primary:hover { background:var(--accent-h); transform:translateY(-1px); }
.btn-outline {
  background:transparent; color:var(--text-mid);
  border:1px solid var(--border);
}
.btn-outline:hover { border-color:var(--border-h); color:var(--text); }

/* ===========================================
   PAGE HEADER (used on subpages)
   =========================================== */
.page-header {
  padding: 80px 0 40px;
  border-bottom: 1px solid var(--border);
}
.page-header .label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  display: block;
  margin-bottom: 10px;
}
.page-header h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.page-header p {
  color: var(--text-mid);
  margin-top: 12px;
  max-width: 560px;
  font-size: 0.95rem;
}

/* ===========================================
   HERO (index only)
   =========================================== */
.hero {
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}
.hero-grid-bg {
  position:absolute; inset:0; pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 50% 50% at 50% 30%, black) ;
}
.hero-glow {
  position:absolute; width:420px; height:420px;
  top:-15%; right:-8%; border-radius:50%;
  background: radial-gradient(circle, rgba(77,139,255,0.06), transparent 70%);
  pointer-events:none;
}
.hero-content {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}
.hero-title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 18px;
}
.hero-desc {
  color: var(--text-mid);
  font-size: 0.95rem;
  max-width: 460px;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-actions { display:flex; gap:10px; }

/* Terminal block */
.terminal {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  background: #08080c;
}
.terminal-bar {
  display:flex; align-items:center; gap:6px;
  padding:11px 16px;
  background: #111118;
  border-bottom: 1px solid var(--border);
}
.terminal-dot { width:9px;height:9px;border-radius:50%;background:#2a2a38; }
.terminal-dot:nth-child(1) { background:#ef4444; }
.terminal-dot:nth-child(2) { background:#eab308; }
.terminal-dot:nth-child(3) { background:#22c55e; }
.terminal-title {
  font-family:var(--mono); font-size:0.65rem;
  color:var(--text-dim); margin-left:8px;
}
.terminal-body {
  padding:18px 20px;
  font-family:var(--mono);
  font-size:0.76rem;
  line-height: 2;
}
.t-prompt { color:var(--green); }
.t-cmd    { color:var(--text); }
.t-out    { color:var(--text-dim); }
.t-ok     { color:var(--green); }
.t-cursor {
  display:inline-block; width:7px; height:13px;
  background:var(--accent); vertical-align:text-bottom;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity:0; } }

/* ===========================================
   SECTION
   =========================================== */
.section {
  padding: 80px 0;
}
.section + .section {
  border-top: 1px solid var(--border);
}
.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  display: block;
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.5rem, 2.5vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}
.section-desc {
  color: var(--text-mid);
  font-size: 0.92rem;
  max-width: 520px;
  margin-bottom: 36px;
}

/* ===========================================
   CARDS (generic)
   =========================================== */
.card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 180ms;
}
.card:hover { border-color: var(--border-h); }
.card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.card p, .card li {
  font-size: 0.85rem;
  color: var(--text-mid);
  line-height: 1.75;
}
.card ul { display:flex; flex-direction:column; gap:6px; }
.card li {
  padding-left: 14px;
  position: relative;
}
.card li::before {
  content:'';
  position:absolute; left:0; top:10px;
  width:4px; height:4px; border-radius:50%;
  background: var(--text-dim);
}

/* ===========================================
   HIGHLIGHT CARDS (index page)
   =========================================== */
.highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.highlight {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: border-color 180ms;
}
.highlight:hover { border-color: var(--border-h); }
.highlight-icon {
  font-size: 1.4rem;
  margin-bottom: 10px;
  display: block;
  color: var(--accent);
}
.highlight h3 {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.highlight p {
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* ===========================================
   GRID LAYOUTS
   =========================================== */
.grid-2 { display:grid; grid-template-columns:repeat(2,1fr); gap:16px; }
.grid-3 { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }

/* ===========================================
   SKILLS (skills.html)
   =========================================== */
.skill-card { position:relative; overflow:hidden; }
.skill-card .card-accent {
  position:absolute; top:0; left:0;
  width:3px; height:100%; border-radius:0 2px 2px 0;
}

/* ===========================================
   PROJECTS (projects.html)
   =========================================== */
.tier-label {
  display: inline-flex; align-items:center; gap:10px;
  margin-bottom: 18px;
  font-weight: 600;
  color: var(--text-mid);
  font-size: 0.9rem;
}
.tier-badge {
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.tier-badge-1 { background:var(--accent-dim); color:var(--accent); }
.tier-badge-2 { background:rgba(123,92,255,0.08); color:var(--purple); }
.tier-badge-3 { background:rgba(245,158,66,0.08); color:var(--orange); }
.project-status {
  display:inline-block;
  padding:3px 10px; border-radius:4px;
  font-size:0.68rem; font-weight:600;
  text-transform:uppercase; letter-spacing:0.5px;
}
.status-progress { background:rgba(45,212,168,0.08); color:var(--green); }
.status-planned  { background:rgba(77,139,255,0.08); color:var(--accent); }
.project-tags { display:flex; flex-wrap:wrap; gap:6px; margin-top:14px; }
.project-tags span {
  padding:3px 9px; border-radius:4px;
  font-size:0.68rem; color:var(--text-dim);
  background:rgba(255,255,255,0.025);
  border:1px solid var(--border);
}
.pipeline-flow {
  display:flex; align-items:center; gap:8px;
  margin-top:16px; padding:14px;
  background:rgba(0,0,0,0.25);
  border-radius:var(--radius);
  flex-wrap: wrap;
}
.pipeline-flow .step {
  padding:5px 14px; border-radius:4px;
  font-size:0.75rem; font-weight:600;
  background:var(--accent-dim); color:var(--accent);
  border:1px solid rgba(77,139,255,0.12);
}
.pipeline-flow .arrow { color:var(--text-dim); font-size:0.8rem; }

/* ===========================================
   LEARNING (learning.html)
   =========================================== */
.book-card {
  display: flex;
  gap: 0;
  overflow: hidden;
}
.book-spine {
  width: 5px;
  flex-shrink: 0;
}
.book-spine-1 { background: var(--red); }
.book-spine-2 { background: var(--accent); }
.book-spine-3 { background: var(--purple); }
.book-body { padding: 28px; }
.book-body h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.book-body h4 {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  margin: 14px 0 6px;
}
.book-body p {
  font-size: 0.85rem;
  color: var(--text-mid);
  line-height: 1.75;
}

/* ===========================================
   CALLOUT
   =========================================== */
.callout {
  padding: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  position: relative;
}
.callout p {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.7;
  color: var(--text-mid);
}
.callout strong {
  color: var(--text);
}
.callout-accent {
  position:absolute; top:0; left:0;
  width:100%; height:2px;
  background: linear-gradient(90deg, var(--accent), var(--purple));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* ===========================================
   REALITY / DIRECTION
   =========================================== */
.reality-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.reality-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.reality-check {
  flex-shrink:0; width:36px; height:36px;
  border-radius:6px;
  display:flex; align-items:center; justify-content:center;
  font-weight:800; font-size:0.85rem;
}
.check-done { background:rgba(45,212,168,0.08); color:var(--green); }
.check-next { background:var(--accent-dim); color:var(--accent); }
.reality-item h4 { font-size:0.9rem; font-weight:700; margin-bottom:3px; }
.reality-item p  { font-size:0.82rem; color:var(--text-mid); }

/* ===========================================
   CONTACT
   =========================================== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.contact-text p {
  color: var(--text-mid);
  font-size: 0.92rem;
  line-height: 1.8;
  margin-bottom: 24px;
}
.contact-link {
  display:inline-flex; align-items:center; gap:10px;
  padding:14px 18px;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  font-size:0.85rem; color:var(--text-mid);
  transition: border-color 180ms, color 180ms;
}
.contact-link:hover { border-color:var(--border-h); color:var(--text); }
.form { display:flex; flex-direction:column; gap:14px; }
.form-field { display:flex; flex-direction:column; gap:5px; }
.form-field label {
  font-size:0.72rem; font-weight:600; color:var(--text-dim);
  text-transform:uppercase; letter-spacing:1px;
}
.form-field input,
.form-field textarea {
  padding:11px 14px;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  color:var(--text); font-family:var(--font);
  font-size:0.85rem; outline:none;
  transition: border-color 180ms;
  resize: vertical;
}
.form-field input:focus,
.form-field textarea:focus { border-color:var(--accent); }
.form-field input::placeholder,
.form-field textarea::placeholder { color:var(--text-dim); }

/* ===========================================
   FOOTER
   =========================================== */
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-name { font-size:0.85rem; font-weight:700; }
.footer-name span { color:var(--accent); }
.footer-right { font-size:0.72rem; color:var(--text-dim); }

/* ===========================================
   REVEAL
   =========================================== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 500ms ease, transform 500ms ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ===========================================
   RESPONSIVE
   =========================================== */
@media (max-width: 900px) {
  .hero-content { grid-template-columns:1fr; gap:36px; }
  .highlights { grid-template-columns:repeat(2,1fr); }
  .grid-3 { grid-template-columns:1fr; }
  .grid-2 { grid-template-columns:1fr; }
  .contact-layout { grid-template-columns:1fr; gap:36px; }
}

@media (max-width: 640px) {
  :root { --px:18px; }
  .section { padding:56px 0; }
  .page-header { padding:60px 0 28px; }
  .hero { padding:72px 0 56px; }
  .hero-title { font-size:1.8rem; letter-spacing:-0.5px; }
  .hero-actions { flex-direction:column; }
  .hero-actions .btn { justify-content:center; }
  .highlights { grid-template-columns:1fr 1fr; }
  .nav-links {
    position:fixed; inset:0;
    background:rgba(11,11,16,0.97);
    backdrop-filter:blur(14px);
    flex-direction:column;
    align-items:center; justify-content:center;
    gap:12px;
    opacity:0; visibility:hidden;
    transition:all 200ms; z-index:100;
  }
  .nav-links.open { opacity:1; visibility:visible; }
  .nav-links a { font-size:1rem; }
  .nav-toggle { display:flex; }
  .footer-inner { flex-direction:column; gap:6px; text-align:center; }
  .terminal-body { font-size:0.68rem; }
  .pipeline-flow { flex-direction:column; align-items:flex-start; }
}