:root {
  --black: #000000;
  --white: #ffffff;
  --gray-900: #0a0a0a;
  --gray-800: #111111;
  --gray-700: #1a1a1a;
  --gray-600: #222222;
  --gray-400: #555555;
  --gray-300: #888888;
  --gray-200: #aaaaaa;
  --gray-100: #cccccc;
  --accent: #ffffff;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--white);
  font-family: 'JetBrains Mono', monospace;
  overflow-x: hidden;
  cursor: none;
}

/* Custom cursor */
.cursor {
  position: fixed;
  width: 12px; height: 12px;
  background: white;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.1s, width 0.2s, height 0.2s, background 0.2s;
  mix-blend-mode: difference;
}
.cursor-ring {
  position: fixed;
  width: 36px; height: 36px;
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: transform 0.15s ease, width 0.3s, height 0.3s;
}

/* Scrollbar */
::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: #000; }
::-webkit-scrollbar-thumb { background: #fff; }

/* ─── NAV ─── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.5rem 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(12px);
}
.nav-logo {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.6rem;
  letter-spacing: 0.15em;
  color: white;
  text-decoration: none;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  color: var(--gray-300);
  text-decoration: none;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.nav-links a:hover { color: white; }
.nav-status {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.65rem; color: var(--gray-300); letter-spacing: 0.1em;
}
.status-dot {
  width: 6px; height: 6px;
  border-radius: 50%; background: #00ff88;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot { 0%,100%{opacity:1} 50%{opacity:0.3} }

/* ─── HERO ─── */
#hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 10rem 3rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.hero-grid-bg::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 50%, transparent 40%, black 100%);
}

.hero-eyebrow {
  font-size: 0.65rem; letter-spacing: 0.4em; text-transform: uppercase;
  color: var(--gray-300); margin-bottom: 2rem;
  display: flex; align-items: center; gap: 1rem;
}
.hero-eyebrow::before {
  content: ''; display: block;
  width: 40px; height: 1px; background: var(--gray-400);
}

.hero-name {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(5rem, 14vw, 14rem);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: white;
  position: relative;
  z-index: 1;
}
.hero-name span {
  display: block;
  -webkit-text-stroke: 1px white;
  color: transparent;
}

.hero-tagline {
  margin-top: 3rem;
  font-size: 0.8rem;
  color: var(--gray-200);
  letter-spacing: 0.08em;
  max-width: 500px;
  line-height: 1.8;
  position: relative; z-index: 1;
}
.hero-tagline .typed-cursor {
  display: inline-block;
  width: 2px; height: 1em;
  background: white;
  margin-left: 2px;
  animation: blink 1s infinite;
  vertical-align: text-bottom;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

.hero-socials {
  margin-top: 4rem;
  display: flex; gap: 1.5rem; flex-wrap: wrap;
  position: relative; z-index: 1;
}
.social-link {
  display: flex; align-items: center; gap: 0.5rem;
  color: var(--gray-300); text-decoration: none;
  font-size: 0.65rem; letter-spacing: 0.2em; text-transform: uppercase;
  border: 1px solid var(--gray-600);
  padding: 0.6rem 1rem;
  transition: all 0.2s;
}
.social-link:hover { color: white; border-color: white; }
.social-link svg { width: 14px; height: 14px; }

.hero-scroll {
  position: absolute; bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  font-size: 0.6rem; letter-spacing: 0.3em; color: var(--gray-400); text-transform: uppercase;
}
.scroll-line {
  width: 1px; height: 50px;
  background: linear-gradient(to bottom, white, transparent);
  animation: scroll-anim 2s infinite;
}
@keyframes scroll-anim { 0%{transform:scaleY(0);transform-origin:top} 50%{transform:scaleY(1);transform-origin:top} 51%{transform-origin:bottom} 100%{transform:scaleY(0);transform-origin:bottom} }

/* ─── SECTION BASE ─── */
section { padding: 8rem 3rem; }
.section-header {
  display: flex; align-items: baseline; gap: 1.5rem;
  margin-bottom: 5rem;
}
.section-num {
  font-size: 0.6rem; color: var(--gray-400);
  letter-spacing: 0.3em;
}
.section-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(3rem, 6vw, 6rem);
  letter-spacing: 0.05em;
  line-height: 1;
}
.section-line {
  flex: 1; height: 1px; background: var(--gray-700); max-width: 200px;
}

/* ─── DAG SECTION ─── */
#dag {
  background: var(--gray-900);
  border-top: 1px solid var(--gray-700);
  border-bottom: 1px solid var(--gray-700);
}

.dag-container {
  width: 100%; overflow-x: auto;
  padding: 2rem 0;
}

#dag-canvas {
  width: 100%; min-height: 320px;
}

.dag-legend {
  display: flex; gap: 2rem; margin-top: 2rem;
  flex-wrap: wrap;
}
.dag-legend-item {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.6rem; color: var(--gray-300); letter-spacing: 0.15em;
}
.dag-dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.dag-dot.source { background: var(--gray-200); }
.dag-dot.transform { background: var(--gray-400); border: 1px solid white; }
.dag-dot.sink { background: transparent; border: 1px solid var(--gray-200); }

/* ─── SQL QUERY SECTION ─── */
#skills {
  background: var(--black);
}

.sql-terminal {
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: 2px;
  overflow: hidden;
  max-width: 900px;
  margin: 0 auto;
}
.sql-terminal-bar {
  background: var(--gray-700);
  padding: 0.8rem 1rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #febc2e; }
.terminal-dot.green { background: #28c840; }
.terminal-title { margin-left: auto; font-size: 0.6rem; color: var(--gray-400); letter-spacing: 0.2em; }

.sql-body { padding: 2rem; }
.sql-line { display: flex; gap: 1rem; margin-bottom: 0.4rem; }
.sql-prompt { color: var(--gray-400); user-select: none; }
.sql-kw { color: #ffffff; font-weight: 700; }
.sql-str { color: var(--gray-200); }
.sql-comment { color: var(--gray-400); font-style: italic; }
.sql-fn { color: #cccccc; text-decoration: underline; text-underline-offset: 3px; }

.sql-select-row {
  display: flex; gap: 1rem;
  margin-bottom: 0.4rem;
  padding-left: 2rem;
}

.query-options {
  margin-top: 2rem;
  display: flex; gap: 1rem; flex-wrap: wrap;
}
.query-option {
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-600);
  background: transparent;
  color: var(--gray-200);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem; letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.2s;
}
.query-option:hover, .query-option.active {
  background: white; color: black; border-color: white;
}

.run-btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  margin-top: 1.5rem;
  padding: 0.8rem 1.5rem;
  background: white; color: black;
  border: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.2em;
  cursor: pointer;
  transition: all 0.2s;
}
.run-btn:hover { background: var(--gray-200); }
.run-btn svg { width: 14px; height: 14px; }

/* Results table */
.results-container {
  margin-top: 2rem;
  border: 1px solid var(--gray-700);
  overflow: hidden;
  display: none;
}
.results-container.visible { display: block; }
.results-header {
  background: var(--gray-700);
  display: grid;
  font-size: 0.6rem; letter-spacing: 0.2em;
  color: var(--gray-300); padding: 0.7rem 1rem;
  text-transform: uppercase;
}
.results-body { }
.result-row {
  display: grid;
  font-size: 0.65rem; padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--gray-800);
  transition: background 0.15s;
  animation: row-in 0.3s ease both;
}
@keyframes row-in { from{opacity:0;transform:translateY(4px)} to{opacity:1;transform:none} }
.result-row:hover { background: var(--gray-800); }
.skill-bar {
  height: 2px; background: var(--gray-700); position: relative; margin-top: 4px;
}
.skill-bar-fill {
  position: absolute; top: 0; left: 0; height: 100%;
  background: white;
  transition: width 0.8s ease;
}
.skill-rating { font-size: 0.6rem; color: var(--gray-400); }

/* Skills grid columns */
.grid-skills { grid-template-columns: 2fr 1fr 3fr; gap: 1rem; }
.grid-edu { grid-template-columns: 3fr 2fr 1fr; gap: 1rem; }
.grid-proj { grid-template-columns: 3fr 4fr; gap: 1rem; }
.grid-cert { grid-template-columns: 3fr 2fr; gap: 1rem; }

/* ─── DDL/DML ABOUT ─── */
#about {
  background: var(--gray-900);
  border-top: 1px solid var(--gray-700);
}

.ddl-block {
  font-size: 0.75rem;
  line-height: 2;
  max-width: 800px;
}
.ddl-kw { color: white; font-weight: 700; }
.ddl-type { color: var(--gray-300); }
.ddl-comment { color: var(--gray-500); }
.ddl-val { color: var(--gray-200); }
.ddl-bracket { color: var(--gray-300); }

/* ─── PROJECTS ─── */
#projects { background: var(--black); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1px;
  background: var(--gray-700);
  border: 1px solid var(--gray-700);
}
.project-card {
  background: var(--black);
  padding: 2rem;
  transition: background 0.2s;
  position: relative;
  overflow: hidden;
}
.project-card:hover { background: var(--gray-800); }

.project-img {
  width: 100%; height: 160px;
  object-fit: cover;
  margin-bottom: 1.5rem;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: opacity 0.3s;
  background: var(--gray-700);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.6rem; color: var(--gray-400);
  letter-spacing: 0.2em;
}
.project-card:hover .project-img { opacity: 1; }

.project-cover-container {
  width: 100%;
  height: 160px;
  overflow: hidden;
  background: var(--gray-900);
  margin-bottom: 1.5rem;
  border: 1px solid var(--gray-800);
}
.project-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.project-card:hover .project-cover-img {
  transform: scale(1.05);
}
.project-tag {
  display: inline-block;
  font-size: 0.55rem; letter-spacing: 0.25em; text-transform: uppercase;
  color: var(--gray-400); margin-bottom: 0.8rem;
}
.project-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: white;
}
.project-desc {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--gray-400);
  margin-bottom: 1.2rem;
  flex-grow: 1;
}
.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.tech-tag {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  background: var(--gray-800);
  color: var(--gray-300);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--gray-700);
}
.project-link {
  font-size: 0.75rem;
  color: white;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255,255,255,0.2);
  padding-bottom: 2px;
  transition: all 0.2s;
}
.project-link:hover {
  border-bottom-color: white;
  padding-left: 5px;
}
/* AI project images legacy styles removed */

/* ─── STACK MARQUEE ─── */
#stack {
  background: var(--gray-900);
  border-top: 1px solid var(--gray-700);
  border-bottom: 1px solid var(--gray-700);
  padding: 4rem 0;
  overflow: hidden;
}
.marquee-track {
  display: flex; gap: 3rem;
  width: max-content;
  animation: marquee 25s linear infinite;
}
@keyframes marquee { from{transform:translateX(0)} to{transform:translateX(-50%)} }
.marquee-item {
  font-size: 0.65rem; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--gray-400); white-space: nowrap;
  display: flex; align-items: center; gap: 1rem;
}
.marquee-sep { color: var(--gray-600); }

/* ─── CONTACT ─── */
#contact {
  background: var(--black);
  border-top: 1px solid var(--gray-700);
  text-align: center;
  padding: 10rem 3rem;
}
.contact-big {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(3rem, 10vw, 10rem);
  -webkit-text-stroke: 1px rgba(255,255,255,0.2);
  color: transparent;
  letter-spacing: 0.05em;
  margin-bottom: 3rem;
  transition: all 0.3s;
}
.contact-big:hover { color: white; -webkit-text-stroke: 0; }

.contact-links {
  display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap;
  margin-top: 3rem;
}
.contact-link {
  font-size: 0.65rem; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--gray-300); text-decoration: none;
  transition: color 0.2s;
}
.contact-link:hover { color: white; }

/* ─── FOOTER ─── */
footer {
  border-top: 1px solid var(--gray-800);
  padding: 2rem 3rem;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.6rem; color: var(--gray-500); letter-spacing: 0.2em;
}

/* ─── SCROLL REVEAL ─── */
.reveal {
  opacity: 1; /* Ensure visible even if observer is slow */
  transform: translateY(20px);
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}
.reveal.visible {
  transform: translateY(0);
}
/* No-JS Fallback */
.no-js .reveal {
  opacity: 1;
  transform: none;
}

/* responsive */
@media (max-width: 768px) {
  nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; }
  section { padding: 5rem 1.5rem; }
  #hero { padding: 8rem 1.5rem 4rem; }
  footer { flex-direction: column; gap: 1rem; }
}