/* =========================================
   RESET & VARIABLES
   ========================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #04040f;
  --bg2:       #080820;
  --accent:    #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.12);
  --text:      #e2e8f0;
  --text-mid:  #94a3b8;
  --text-dim:  #4a5a6e;
  --border:    rgba(0, 212, 255, 0.12);
  --border2:   rgba(255, 255, 255, 0.05);
  --font:      'Space Grotesk', sans-serif;
  --mono:      'JetBrains Mono', monospace;
  --r:         8px;
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  overflow-x: hidden;
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }

/* =========================================
   LOADING
   ========================================= */
#loading {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999;
  transition: opacity .6s, visibility .6s;
}
#loading.hidden { opacity: 0; visibility: hidden; }

.loading-inner { text-align: center; width: 260px; }
.loading-label {
  font-family: var(--mono); font-size: .68rem;
  letter-spacing: .3em; color: var(--accent); margin-bottom: 1.5rem;
}
.loading-bar {
  width: 100%; height: 1px;
  background: rgba(0,212,255,.15); margin-bottom: 1rem; overflow: hidden;
}
.loading-fill {
  height: 100%; width: 0%;
  background: var(--accent); transition: width .1s linear;
  box-shadow: 0 0 10px var(--accent);
}
.loading-sub {
  font-family: var(--mono); font-size: .64rem;
  color: var(--text-dim); letter-spacing: .1em;
}

/* =========================================
   GRID BACKGROUND
   ========================================= */
.grid-bg {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,.022) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none; z-index: 0;
}

/* =========================================
   NAV
   ========================================= */
#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 1.2rem 5rem;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(4,4,15,.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: padding .3s;
}
.nav-logo {
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -.01em;
}
.accent { color: var(--accent); }

.nav-links { display: flex; list-style: none; gap: 2.5rem; }
.nav-links a {
  font-size: .85rem; color: var(--text-dim);
  letter-spacing: .04em; transition: color .2s; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -3px; left: 0;
  width: 0; height: 1px; background: var(--accent); transition: width .2s;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { width: 100%; }

.nav-status { display: flex; align-items: center; gap: .5rem; }
.status-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #22c55e; box-shadow: 0 0 8px #22c55e;
  animation: pdot 2s infinite;
}
@keyframes pdot { 0%,100%{opacity:1} 50%{opacity:.35} }
.status-text {
  font-family: var(--mono); font-size: .68rem;
  color: var(--text-dim); letter-spacing: .08em;
}

/* =========================================
   HERO
   ========================================= */
#hero {
  min-height: 100vh;
  display: grid; grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 7rem 5rem 4rem;
  gap: 3rem; position: relative; z-index: 1;
}

.hero-tag {
  font-family: var(--mono); font-size: .7rem;
  color: var(--accent); letter-spacing: .3em; text-transform: uppercase;
  margin-bottom: 1.75rem;
  display: flex; align-items: center; gap: .75rem;
}
.hero-tag::before {
  content: ''; width: 2rem; height: 1px; background: var(--accent); flex-shrink: 0;
}
.hero-title {
  font-size: clamp(3.5rem, 6vw, 5.5rem);
  font-weight: 700; line-height: 1.0;
  margin-bottom: 1rem; letter-spacing: -.02em;
}
.name-line { display: block; }
.accent-line {
  background: linear-gradient(90deg, var(--accent) 0%, #a78bfa 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-role {
  font-family: var(--mono); font-size: .95rem;
  color: var(--text-dim); margin-bottom: 1.75rem; min-height: 1.5em;
}
.role-prefix { color: var(--accent); opacity: .55; }
.role-cursor { animation: blink 1s step-end infinite; color: var(--accent); }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

.hero-desc {
  font-size: 1.05rem; color: var(--text-mid);
  line-height: 1.8; margin-bottom: 2.5rem; max-width: 480px;
}
.hero-cta { display: flex; gap: 1rem; }

.btn {
  display: inline-block; padding: .8rem 1.75rem;
  border-radius: var(--r); font-family: var(--mono);
  font-size: .82rem; letter-spacing: .06em;
  cursor: pointer; transition: all .25s; border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent); color: var(--bg); font-weight: 600;
}
.btn-primary:hover {
  background: #33ddff;
  box-shadow: 0 0 28px rgba(0,212,255,.4); transform: translateY(-2px);
}
.btn-outline { background: transparent; color: var(--text-mid); border-color: var(--border2); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

#robot-container {
  position: relative; width: 100%; height: 80vh;
  display: flex; align-items: center; justify-content: center; cursor: grab;
}
#robot-container:active { cursor: grabbing; }
#robot-canvas { display: block; width: 100% !important; height: 100% !important; }
.robot-glow {
  position: absolute; width: 55%; height: 55%;
  background: radial-gradient(circle, rgba(0,212,255,.07) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.robot-hint {
  position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: .5rem;
  font-family: var(--mono); font-size: .63rem; color: var(--text-dim);
  letter-spacing: .1em; background: rgba(0,212,255,.06);
  border: 1px solid var(--border); padding: .38rem .9rem;
  border-radius: 20px; pointer-events: none; white-space: nowrap;
  transition: opacity .5s;
}
.robot-hint.hidden { opacity: 0; }

.scroll-cue {
  position: absolute; bottom: 2.5rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .6rem;
  font-family: var(--mono); font-size: .58rem; color: var(--text-dim);
  letter-spacing: .3em; animation: sfloat 2.5s ease-in-out infinite;
}
.scroll-arrow { width: 1px; height: 2rem; background: linear-gradient(to bottom, var(--accent), transparent); }
@keyframes sfloat {
  0%,100%{ transform: translateX(-50%) translateY(0); }
  50%{ transform: translateX(-50%) translateY(6px); }
}

/* =========================================
   SHARED SECTION CHROME
   ========================================= */
section { padding: 7rem 5rem; position: relative; z-index: 1; }
section + section { border-top: 1px solid var(--border2); }

.section-header { margin-bottom: 3.5rem; }
.section-tag {
  font-family: var(--mono); font-size: .68rem;
  color: var(--accent); letter-spacing: .3em; text-transform: uppercase;
  margin-bottom: .85rem;
  display: flex; align-items: center; gap: .75rem;
}
.section-tag::before {
  content: ''; width: 1.75rem; height: 1px; background: var(--accent); flex-shrink: 0;
}
.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 700; letter-spacing: -.02em;
}
.text-link {
  font-family: var(--mono); font-size: .82rem;
  color: var(--accent); letter-spacing: .04em; transition: opacity .2s;
}
.text-link:hover { opacity: .65; }

/* =========================================
   ABOUT — brief bio strip
   ========================================= */
#about { padding: 4.5rem 5rem; }
.bio-grid {
  display: grid; grid-template-columns: 1.4fr 1fr;
  gap: 5rem; align-items: center;
}
.bio-left .section-tag { margin-bottom: 1.25rem; }
.bio-text {
  font-size: 1.05rem; color: var(--text-mid);
  line-height: 1.8; margin-bottom: 1.75rem;
}
.bio-text strong { color: var(--text); font-weight: 600; }
.bio-links { display: flex; gap: 2rem; }

.bio-stats {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1px; background: var(--border2); border: 1px solid var(--border2);
  border-radius: var(--r); overflow: hidden;
}
.bstat {
  background: var(--bg2); padding: 1.5rem;
  display: flex; flex-direction: column; gap: .3rem;
  transition: background .2s;
}
.bstat:hover { background: rgba(0,212,255,.04); }
.bstat-n {
  font-family: var(--mono); font-size: 1.6rem;
  font-weight: 700; color: var(--accent); line-height: 1;
}
.bstat-l { font-size: .78rem; color: var(--text-dim); letter-spacing: .04em; }

/* =========================================
   EXPERIENCE — vertical timeline
   ========================================= */
.timeline {
  position: relative;
  padding-left: 2rem;
  display: flex; flex-direction: column; gap: 0;
}
.timeline::before {
  content: '';
  position: absolute; left: 0; top: .35rem; bottom: 2rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent) 0%, transparent 100%);
  opacity: .35;
}

.tl-item {
  position: relative;
  padding-bottom: 3.5rem;
}
.tl-item:last-child { padding-bottom: 0; }

.tl-dot {
  position: absolute; left: -2.4rem; top: .32rem;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 1.5px solid var(--accent);
  box-shadow: 0 0 10px rgba(0,212,255,.5);
  transition: background .25s;
}
.tl-item:hover .tl-dot { background: var(--accent); }

.tl-content {
  padding: 1.75rem 2rem;
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--r);
  transition: border-color .25s;
}
.tl-item:hover .tl-content { border-color: var(--border); }

.tl-meta {
  display: flex; justify-content: space-between;
  align-items: baseline; flex-wrap: wrap; gap: .5rem 1.5rem;
  margin-bottom: .3rem;
}
.tl-company { font-size: 1.1rem; font-weight: 600; }
.tl-period {
  font-family: var(--mono); font-size: .7rem;
  color: var(--text-dim); white-space: nowrap;
}
.tl-role {
  font-family: var(--mono); font-size: .78rem;
  color: var(--accent); margin-bottom: 1rem; letter-spacing: .04em;
}
.tl-desc {
  font-size: .92rem; color: var(--text-mid); line-height: 1.75;
  margin-bottom: 1.25rem;
}
.tl-tags {
  display: flex; flex-wrap: wrap; gap: .4rem;
}
.tl-tags span {
  font-family: var(--mono); font-size: .72rem;
  color: var(--text-dim);
  border: 1px solid rgba(100,116,139,.22);
  padding: .2rem .6rem; border-radius: 3px;
}

/* =========================================
   PROJECTS
   ========================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 1.25rem;
}
.project-card {
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--r); padding: 2.25rem;
  position: relative; overflow: hidden;
  transition: border-color .25s, transform .25s;
}
.project-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s;
}
.project-card:hover { border-color: var(--border); transform: translateY(-4px); }
.project-card:hover::before { transform: scaleX(1); }

.pcard-top {
  display: flex; justify-content: space-between;
  align-items: center; margin-bottom: 1rem; flex-wrap: wrap; gap: .5rem;
}
.pcard-type {
  font-family: var(--mono); font-size: .65rem;
  color: var(--accent); letter-spacing: .18em; text-transform: uppercase;
}
.pcard-date {
  font-family: var(--mono); font-size: .68rem; color: var(--text-dim);
}
.pcard-title {
  font-size: 1.3rem; font-weight: 600;
  letter-spacing: -.01em; margin-bottom: 1rem; line-height: 1.3;
}
.pcard-desc {
  font-size: .9rem; color: var(--text-mid);
  line-height: 1.75; margin-bottom: 1.5rem;
}
.pcard-tech {
  display: flex; flex-wrap: wrap; gap: .4rem;
}
.pcard-tech span {
  font-family: var(--mono); font-size: .72rem;
  color: var(--text-dim);
  border: 1px solid rgba(100,116,139,.22);
  padding: .2rem .6rem; border-radius: 3px;
}

/* =========================================
   SKILLS — flat board
   ========================================= */
.skills-board {
  display: flex; flex-direction: column; gap: 1.75rem;
}
.skill-group {
  display: grid; grid-template-columns: 160px 1fr;
  gap: 1rem; align-items: start;
}
.skill-group-label {
  font-family: var(--mono); font-size: .72rem;
  color: var(--text-dim); letter-spacing: .12em;
  text-transform: uppercase; padding-top: .3rem;
}
.skill-group-tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.skill-group-tags span {
  font-size: .85rem; color: var(--text-mid);
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border2);
  padding: .32rem .85rem; border-radius: 4px;
  transition: border-color .2s, color .2s;
}
.skill-group-tags span:hover { border-color: var(--border); color: var(--text); }

/* =========================================
   CONTACT
   ========================================= */
#contact { text-align: center; }
.contact-wrap { max-width: 520px; margin: 0 auto; }
#contact .section-tag { justify-content: center; }
#contact .section-tag::before { display: none; }
.contact-heading {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700; letter-spacing: -.03em;
  margin-bottom: 1.25rem; line-height: 1.1;
}
.contact-sub {
  font-size: 1rem; color: var(--text-mid);
  line-height: 1.7; margin-bottom: 2.5rem;
}
.contact-email {
  display: inline-block; font-family: var(--mono);
  font-size: 1.05rem; color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: .2rem; margin-bottom: 2.5rem;
  transition: border-color .25s, opacity .25s;
}
.contact-email:hover { border-color: var(--accent); opacity: .75; }
.social-links { display: flex; justify-content: center; gap: 2.5rem; }
.social-link {
  font-family: var(--mono); font-size: .78rem;
  color: var(--text-dim); letter-spacing: .12em; text-transform: uppercase;
  transition: color .2s;
}
.social-link:hover { color: var(--accent); }

/* =========================================
   FOOTER
   ========================================= */
footer {
  border-top: 1px solid var(--border2);
  padding: 1.75rem 5rem;
  display: flex; justify-content: space-between; align-items: center;
  z-index: 1; position: relative;
}
.footer-copy {
  font-family: var(--mono); font-size: .72rem;
  color: var(--text-dim); letter-spacing: .08em;
}

/* =========================================
   SCROLL REVEAL
   ========================================= */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 1100px) {
  #hero { grid-template-columns: 1fr; padding: 8rem 3rem 4rem; text-align: center; }
  .hero-text { order: 2; }
  #robot-container { order: 1; height: 55vh; width: 80%; margin: 0 auto; }
  .hero-tag { justify-content: center; }
  .hero-cta { justify-content: center; }
  .hero-desc { max-width: 100%; }
  .scroll-cue { display: none; }
  .bio-grid { grid-template-columns: 1fr; gap: 3rem; }
}

@media (max-width: 768px) {
  #nav { padding: 1rem 1.5rem; }
  .nav-status { display: none; }
  .nav-links { gap: 1.5rem; }
  section { padding: 5rem 1.5rem; }
  #about { padding: 3.5rem 1.5rem; }
  footer { padding: 1.5rem; }
  .timeline { padding-left: 1.5rem; }
  .tl-dot { left: -1.9rem; }
  .tl-content { padding: 1.25rem 1.5rem; }
  .skill-group { grid-template-columns: 1fr; gap: .5rem; }
  .projects-grid { grid-template-columns: 1fr; }
}