/* ============================================================
   Parth Patel — Portfolio
   Palette: Ink #070B14 · Paper #F5F6FA · Signal Amber #FFB238
            AI Violet #8C7BFF · Slate #98A2B8 · Line #1C2540
   Type: Space Grotesk (display) / IBM Plex Sans (body) / IBM Plex Mono (data)
   ============================================================ */

:root {
  --ink: #070b14;
  --ink-raised: #0e1526;
  --paper: #f5f6fa;
  --paper-dim: #c9cbd6;
  --amber: #ffb238;
  --amber-glow: rgba(255, 178, 56, 0.35);
  --violet: #8c7bff;
  --violet-glow: rgba(140, 123, 255, 0.35);
  --claude-orange: #d97757;
  --claude-orange-glow: rgba(217, 119, 87, 0.35);
  --slate: #98a2b8;
  --line: #1c2540;
  --line-soft: rgba(28, 37, 64, 0.6);
  --green: #3ecf8e;
  --glass-bg: rgba(255, 255, 255, 0.035);
  --glass-border: rgba(255, 255, 255, 0.09);
  --heading: #ffffff;
  --grain-opacity: 0.035;
  --header-bg: rgba(7, 11, 20, 0.82);

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;

  --col-max: 1200px;
  --col-read: 720px;
}

:root[data-theme="light"] {
  --ink: #f4f5f9;
  --ink-raised: #ffffff;
  --paper: #12131a;
  --paper-dim: #3c4152;
  --slate: #5b6478;
  --line: #d7dbe6;
  --line-soft: rgba(18, 19, 26, 0.12);
  --glass-bg: rgba(18, 19, 26, 0.03);
  --glass-border: rgba(18, 19, 26, 0.1);
  --heading: #0b0c11;
  --grain-opacity: 0.025;
  --header-bg: rgba(244, 245, 249, 0.82);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .hero-orb, .marquee-track, .nav-mark::before, .claude-mark { animation: none !important; }
  .cursor-dot, .cursor-ring { display: none !important; }
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; margin: 0; color: var(--heading); }
p { margin: 0; color: var(--slate); }
a { color: inherit; text-decoration: none; }
code { font-family: var(--font-mono); font-size: 0.82rem; }

.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 1; opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============ SKIP LINK ============ */
.skip-link {
  position: fixed; top: -60px; left: 12px; z-index: 200;
  background: var(--amber); color: #14100a; padding: 10px 18px; border-radius: 4px;
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

/* ============ SCROLL PROGRESS ============ */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0%;
  background: linear-gradient(90deg, var(--amber), var(--violet));
  z-index: 100;
  transition: width 0.1s linear;
}

/* ============ CURSOR GLOW ============ */
.cursor-glow {
  position: fixed; top: 0; left: 0; width: 480px; height: 480px;
  border-radius: 50%; pointer-events: none; z-index: 0;
  background: radial-gradient(circle, rgba(255, 178, 56, 0.06) 0%, rgba(140, 123, 255, 0.04) 45%, transparent 70%);
  transform: translate(-50%, -50%);
  opacity: 0; transition: opacity 0.4s ease;
  will-change: transform;
}
.cursor-glow.active { opacity: 1; }
@media (pointer: coarse) { .cursor-glow { display: none; } }

/* ============ CUSTOM CURSOR (dot + trailing ring) ============ */
.cursor-dot, .cursor-ring {
  position: fixed; top: 0; left: 0; border-radius: 50%; pointer-events: none;
  opacity: 0; transform: translate(-50%, -50%); will-change: transform;
}
.cursor-dot {
  width: 6px; height: 6px; background: var(--amber); z-index: 101;
  transition: opacity 0.3s ease, background 0.2s ease, width 0.2s ease, height 0.2s ease;
}
.cursor-ring {
  width: 34px; height: 34px; border: 1.5px solid var(--violet-glow); z-index: 100;
  transition: opacity 0.3s ease, width 0.25s ease, height 0.25s ease, border-color 0.25s ease;
}
.cursor-dot.active, .cursor-ring.active { opacity: 1; }
.cursor-ring.hover { width: 56px; height: 56px; border-color: var(--amber); }
.cursor-dot.hover { width: 0; height: 0; }
@media (pointer: coarse) { .cursor-dot, .cursor-ring { display: none; } }

/* ============ HERO ORBS ============ */
.hero-orb {
  position: absolute; border-radius: 50%; filter: blur(90px);
  pointer-events: none; z-index: 0;
}
.hero-orb-amber { width: 420px; height: 420px; background: var(--amber-glow); top: -120px; right: -80px; animation: drift-a 16s ease-in-out infinite; }
.hero-orb-violet { width: 380px; height: 380px; background: var(--violet-glow); bottom: -140px; left: -100px; animation: drift-b 20s ease-in-out infinite; }
.hero-orb-ai { width: 320px; height: 320px; top: 20%; right: -60px; opacity: 0.7; }
.hero-orb-contact { width: 340px; height: 340px; bottom: -100px; right: 10%; opacity: 0.6; }

@keyframes drift-a {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 30px) scale(1.08); }
}
@keyframes drift-b {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -20px) scale(1.05); }
}

/* ============ SCROLL REVEAL ============ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ============ NAV ============ */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.nav { max-width: var(--col-max); margin: 0 auto; padding: 18px 32px; display: flex; align-items: center; gap: 32px; }

.nav-mark {
  position: relative; display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 10px;
  isolation: isolate; transition: transform 0.25s ease;
}
.nav-mark::before {
  content: ""; position: absolute; inset: -1.5px; border-radius: 11px; z-index: -2;
  background: conic-gradient(from 0deg, var(--amber), var(--violet), var(--green), var(--amber));
  animation: spin-badge 5s linear infinite;
}
.nav-mark::after {
  content: ""; position: absolute; inset: 1.5px; border-radius: 9px; z-index: -1;
  background: var(--ink);
}
.nav-mark span {
  font-family: var(--font-display); font-weight: 700; font-size: 0.82rem;
  letter-spacing: 0.02em; color: var(--paper);
}
.nav-mark:hover { transform: scale(1.06); }
@keyframes spin-badge { to { transform: rotate(360deg); } }

.nav-links { display: flex; gap: 24px; flex: 1; }
.nav-links a { color: var(--slate); font-size: 0.92rem; padding: 4px 0; border-bottom: 1px solid transparent; white-space: nowrap; transition: color 0.15s ease, border-color 0.15s ease; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--paper); border-color: var(--amber); }

.nav-status { font-size: 0.82rem; color: var(--slate); display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 3px rgba(62, 207, 142, 0.18); animation: pulse-dot 2.4s ease-in-out infinite; }
@keyframes pulse-dot { 0%, 100% { box-shadow: 0 0 0 3px rgba(62, 207, 142, 0.18); } 50% { box-shadow: 0 0 0 6px rgba(62, 207, 142, 0.1); } }

.nav-resume-btn {
  flex-shrink: 0; font-family: var(--font-mono); font-size: 0.8rem; font-weight: 500;
  color: var(--ink); background: var(--amber); border: 1px solid var(--amber);
  border-radius: 6px; padding: 8px 14px; white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.nav-resume-btn:hover, .nav-resume-btn:focus-visible { transform: translateY(-1px); box-shadow: 0 6px 18px var(--amber-glow); }
:root[data-theme="light"] .nav-resume-btn { color: #14100a; }

.theme-toggle {
  flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 8px; background: none; cursor: pointer;
  border: 1px solid var(--glass-border); color: var(--paper-dim); padding: 0;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover, .theme-toggle:focus-visible { color: var(--amber); border-color: var(--amber); }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.nav-toggle { display: none; flex-direction: column; align-items: center; justify-content: center; gap: 5px; width: 44px; height: 44px; background: none; border: none; cursor: pointer; margin-left: auto; padding: 0; }
.nav-toggle span { display: block; width: 20px; height: 1.5px; background: var(--paper); transition: transform 0.2s ease, opacity 0.2s ease; }
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.25px) rotate(-45deg); }

@media (max-width: 920px) {
  .nav { padding: 16px 20px; flex-wrap: wrap; }
  .nav-toggle { display: flex; order: 4; }
  .nav-status { display: none; }
  .nav-resume-btn { padding: 8px 11px; }
  .nav-links { order: 5; flex: 0 0 100%; flex-direction: column; gap: 4px; max-height: 0; overflow: hidden; transition: max-height 0.25s ease; }
  .nav-links.open { max-height: 320px; margin-top: 14px; }
  .nav-links a { padding: 10px 0; border-bottom: 1px solid var(--line-soft); }
}

/* ============ LAYOUT HELPERS ============ */
.section { max-width: var(--col-max); margin: 0 auto; padding: 96px 32px; position: relative; z-index: 2; }
.section-alt { background: var(--ink-raised); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); max-width: none; }
.section-alt > * { max-width: var(--col-max); margin-left: auto; margin-right: auto; }
.section-head { max-width: var(--col-read); margin-bottom: 56px; }
.section-head h2 { font-size: clamp(1.6rem, 2.4vw, 2rem); margin-bottom: 10px; }
.section-head p { font-size: 1rem; }

/* ============ HERO ============ */
.hero {
  max-width: var(--col-max); margin: 0 auto; padding: 110px 32px 64px;
  position: relative; z-index: 2; overflow: hidden;
}

.hero-grid { display: grid; grid-template-columns: 1fr; gap: 40px; align-items: start; }

.hero-text { max-width: 680px; }

.hero-kicker { font-family: var(--font-mono); font-size: 0.85rem; color: var(--amber); margin-bottom: 22px; }
.hero-title { font-size: clamp(2.4rem, 5.6vw, 3.8rem); line-height: 1.14; color: var(--heading); }
.hero-subhead { margin-top: 20px; font-size: 1.05rem; line-height: 1.65; max-width: 56ch; }

.hero-cycle {
  margin-top: 18px; display: flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 0.88rem; color: var(--paper-dim);
}
.hero-cycle-caret { color: var(--green); font-weight: 600; }
.hero-cycle-text { position: relative; }
.hero-cycle-text::after {
  content: ""; display: inline-block; width: 2px; height: 1em; margin-left: 2px;
  background: var(--amber); vertical-align: -0.15em; animation: blink 1s step-end infinite;
}

.hero-actions { margin-top: 40px; display: flex; gap: 14px; flex-wrap: wrap; }

/* ---- hero load-in stagger ---- */
.hero-text > * { opacity: 0; transform: translateY(18px); transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1); }
.hero-text > *:nth-child(1) { transition-delay: 0.05s; }
.hero-text > *:nth-child(2) { transition-delay: 0.14s; }
.hero-text > *:nth-child(3) { transition-delay: 0.23s; }
.hero-text > *:nth-child(4) { transition-delay: 0.32s; }
.hero-text > *:nth-child(5) { transition-delay: 0.41s; }
.hero-panel { opacity: 0; transform: translateY(18px); transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.5s, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.5s; }
body.hero-loaded .hero-text > *, body.hero-loaded .hero-panel { opacity: 1; transform: none; }

/* ---- scroll cue ---- */
.scroll-cue {
  display: flex; align-items: center; gap: 8px; margin-top: 56px;
  font-family: var(--font-mono); font-size: 0.76rem; color: var(--slate);
  opacity: 0; transition: opacity 0.8s ease 0.9s, color 0.2s ease; width: fit-content;
}
.scroll-cue:hover, .scroll-cue:focus-visible { color: var(--amber); }
body.hero-loaded .scroll-cue { opacity: 1; }
.scroll-cue-arrow { display: inline-block; animation: bob 1.8s ease-in-out infinite; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(5px); } }
@media (max-width: 640px) { .scroll-cue { display: none; } }

.btn { position: relative; display: inline-block; padding: 13px 24px; border-radius: 3px; font-size: 0.95rem; font-weight: 500; transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease; }
.btn span { position: relative; z-index: 1; }
.btn-primary { background: var(--amber); color: #14100a; }
.btn-primary:hover { box-shadow: 0 8px 28px var(--amber-glow); }
.btn-ghost { border: 1px solid var(--line); color: var(--paper); }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); box-shadow: 0 8px 24px rgba(255, 178, 56, 0.12); }
.btn:focus-visible, a:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }

/* magnetic hover (JS sets --mx/--my translate) */
.magnetic { transform: translate(var(--mx, 0), var(--my, 0)); }

/* ---- hero side panel ---- */
.hero-panel {
  background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 10px;
  padding: 28px 26px; backdrop-filter: blur(6px);
}
.hero-panel-divider { height: 1px; background: var(--line-soft); margin: 26px 0 20px; }
.hero-panel-label { font-family: var(--font-mono); font-size: 0.76rem; color: var(--slate); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 14px; }
.hero-panel-list { display: flex; flex-direction: column; gap: 12px; }
.hero-panel-list li { font-size: 0.92rem; color: var(--paper-dim); }
.hero-panel-list li a { display: flex; align-items: center; gap: 10px; transition: color 0.2s ease; }
.hero-panel-list li a:hover, .hero-panel-list li a:focus-visible { color: var(--amber); }
.dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.dot-violet { background: var(--violet); box-shadow: 0 0 10px var(--violet-glow); }
.dot-amber { background: var(--amber); box-shadow: 0 0 10px var(--amber-glow); }

/* ---- stat row ---- */
.stat-row { display: flex; gap: 28px 32px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; flex: 1 1 110px; min-width: 110px; transition: transform 0.2s ease; }
.stat:hover, .stat:focus-visible { transform: translateY(-2px); }
.stat:hover .stat-label, .stat:focus-visible .stat-label { color: var(--amber); }
.stat-number { font-family: var(--font-display); font-size: 2.1rem; font-weight: 700; color: var(--amber); line-height: 1; }
.stat-label { margin-top: 8px; font-size: 0.8rem; color: var(--slate); max-width: 16ch; transition: color 0.2s ease; }

@media (min-width: 980px) {
  .hero-grid { grid-template-columns: 1.2fr 0.85fr; gap: 56px; }
  .hero-panel { margin-top: 8px; }
}

/* ============ MARQUEE ============ */
.marquee {
  position: relative; overflow: hidden; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft);
  background: var(--ink-raised); padding: 18px 0; z-index: 2;
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee-track { display: flex; width: max-content; animation: scroll-left 32s linear infinite; }
.marquee-track span {
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--slate);
  padding: 0 28px; white-space: nowrap; border-right: 1px solid var(--line-soft);
}
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes scroll-left { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ============ ABOUT ============ */
.about-grid { display: grid; grid-template-columns: 1fr; gap: 40px; align-items: start; }
.about-text { display: flex; flex-direction: column; gap: 18px; max-width: var(--col-read); }
.about-text p { font-size: 1rem; }

.about-panel {
  background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 10px;
  padding: 26px; display: flex; flex-direction: column; gap: 18px;
}
.about-fact { display: flex; flex-direction: column; gap: 5px; padding-bottom: 16px; border-bottom: 1px solid var(--line-soft); }
.about-fact:last-child { border-bottom: none; padding-bottom: 0; }
.about-fact-label { font-family: var(--font-mono); font-size: 0.74rem; color: var(--slate); text-transform: uppercase; letter-spacing: 0.04em; }
.about-fact-value { font-size: 0.95rem; color: var(--paper-dim); }
.about-status { display: flex; align-items: center; gap: 8px; }

.about-github { padding-top: 4px; }
.about-github-label { font-family: var(--font-mono); font-size: 0.74rem; color: var(--slate); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 12px; }
.about-github img { display: block; width: 100%; height: auto; border-radius: 6px; }
.about-github img[hidden] { display: none; }
.about-github-fallback {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  border: 1px solid var(--line); border-radius: 6px; padding: 13px 15px;
  font-size: 0.9rem; color: var(--paper-dim); transition: border-color 0.2s ease, color 0.2s ease;
}
.about-github-fallback[hidden] { display: none; }
.about-github-fallback:hover, .about-github-fallback:focus-visible { border-color: var(--amber); color: var(--amber); }

@media (min-width: 900px) {
  .about-grid { grid-template-columns: 1.4fr 0.8fr; gap: 56px; }
}

/* ============ TILT (mouse-tracking 3D hover) ============ */
.tilt { transform-style: preserve-3d; transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1); will-change: transform; }

/* ============ WORK SUBHEADS ============ */
.work-subhead {
  display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--paper-dim); margin: 0 0 24px;
}
.work-subhead:not(:first-child) { margin-top: 64px; }
.work-subhead-note { text-transform: none; letter-spacing: normal; font-size: 0.8rem; color: var(--slate); font-style: italic; }

/* ============ FEATURED PROJECT CARDS ============ */
.featured-grid { display: grid; grid-template-columns: 1fr; gap: 28px; }
@media (min-width: 720px) { .featured-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1160px) { .featured-grid { grid-template-columns: repeat(3, 1fr); } }

.feature-card {
  --accent: var(--amber); --accent-glow: var(--amber-glow);
  display: flex; flex-direction: column; border-radius: 12px; overflow: hidden;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.feature-card:hover { border-color: var(--accent); box-shadow: 0 20px 48px -20px var(--accent-glow); }

.feature-visual { position: relative; padding: 12px; background: var(--ink); }
.section-alt .feature-visual { background: var(--ink-raised); }
.feature-visual-bar { display: flex; gap: 5px; padding: 4px 4px 12px; }
.feature-visual-bar span { width: 7px; height: 7px; border-radius: 50%; background: var(--line); }
.feature-visual-body {
  border-radius: 6px; padding: 16px; display: flex; flex-direction: column; gap: 10px;
  background: linear-gradient(155deg, color-mix(in srgb, var(--accent) 16%, transparent), transparent 60%),
              var(--ink-raised);
}
.section-alt .feature-visual-body { background: linear-gradient(155deg, color-mix(in srgb, var(--accent) 16%, transparent), transparent 60%), var(--ink); }
.fv-row { height: 9px; border-radius: 3px; background: color-mix(in srgb, var(--accent) 28%, var(--line)); width: 40%; }
.fv-row-wide { width: 72%; height: 12px; background: color-mix(in srgb, var(--accent) 42%, var(--line)); }
.fv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 4px; }
.fv-grid div { aspect-ratio: 1.3; border-radius: 5px; background: color-mix(in srgb, var(--accent) 20%, var(--line-soft)); }
.fv-grid div:nth-child(2) { background: color-mix(in srgb, var(--accent) 34%, var(--line-soft)); }

.feature-content { padding: 22px 22px 24px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.feature-top { display: flex; align-items: center; gap: 10px; font-size: 0.8rem; }
.feature-date { font-family: var(--font-mono); color: var(--accent); }
.feature-org { color: var(--slate); }
.feature-content h3 { font-size: 1.08rem; line-height: 1.3; }
.feature-content p { font-size: 0.9rem; line-height: 1.55; }
.feature-content .tag-row { margin-top: 2px; }
.feature-content .tag-row a code:hover { border-color: var(--accent); color: var(--accent); }
.feature-content .project-links { margin-top: auto; padding-top: 6px; }
.feature-content .project-link { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }

/* ============ PROJECTS (enterprise list) ============ */
.project-list { display: flex; flex-direction: column; }
.project-row {
  display: grid; grid-template-columns: 160px 1fr; gap: 32px; padding: 32px 0;
  border-top: 1px solid var(--line-soft); transition: padding-left 0.3s ease, border-color 0.3s ease;
}
.project-row:last-of-type { border-bottom: 1px solid var(--line-soft); }
.project-row:hover { padding-left: 12px; border-color: var(--line); }
.project-meta { display: flex; flex-direction: column; gap: 4px; }
.project-date { font-family: var(--font-mono); color: var(--amber); font-size: 0.85rem; }
.project-org { font-size: 0.85rem; color: var(--slate); }
.project-body h3 { font-size: 1.2rem; margin-bottom: 10px; max-width: 34ch; }
.project-body p { max-width: var(--col-read); font-size: 0.98rem; }
.tag-row { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }
.tag-row code { background: var(--ink-raised); border: 1px solid var(--line); color: var(--paper-dim); padding: 4px 9px; border-radius: 3px; transition: border-color 0.2s ease, color 0.2s ease; }
.tag-row a code:hover { border-color: var(--amber); color: var(--amber); }
.section-alt .tag-row code { background: var(--ink); }
.tag-row-ai code { border-color: rgba(140, 123, 255, 0.35); color: #cfc8ff; }
.tag-row-ai a code:hover { border-color: var(--violet); color: var(--violet); }
.project-footnote { padding-top: 24px; font-size: 0.88rem; color: var(--slate); }
.project-access { margin-top: 14px; font-size: 0.82rem; font-style: italic; color: var(--slate); }
.access-badge {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 14px;
  font-family: var(--font-mono); font-size: 0.76rem; color: var(--slate);
  border: 1px solid var(--line); border-radius: 20px; padding: 4px 11px; width: fit-content;
}
.access-badge::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--slate); flex-shrink: 0; }
.project-links { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 14px; }
.project-link {
  display: inline-block; font-family: var(--font-mono); font-size: 0.85rem;
  color: var(--amber); border-bottom: 1px solid rgba(255, 178, 56, 0.35);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.project-link:hover { color: var(--paper); border-color: var(--paper); }

@media (max-width: 640px) {
  .project-row { grid-template-columns: 1fr; gap: 8px; }
  .project-row:hover { padding-left: 0; }
}

/* ============ SERVICES ============ */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); }
.service-card { background: var(--ink); padding: 30px 26px; transition: background 0.25s ease; }
.section-alt .service-card { background: var(--ink-raised); }
.service-card:hover { background: var(--ink-raised); }
.section-alt .service-card:hover { background: var(--ink); }
.service-index { font-family: var(--font-mono); font-size: 0.85rem; color: var(--amber); }
.service-card.ai .service-index { color: var(--violet); }
.service-card h3 { font-size: 1.05rem; margin: 14px 0 10px; }
.service-card p { font-size: 0.92rem; }

/* ============ STACK ============ */
.stack-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); gap: 40px 32px; }
.stack-group h3 { font-size: 0.95rem; color: var(--paper-dim); font-weight: 500; margin-bottom: 14px; font-family: var(--font-body); }
@media (min-width: 1160px) {
  .stack-grid { grid-template-columns: repeat(5, 1fr); }
}
.stack-footnote { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line-soft); font-size: 0.82rem; color: var(--slate); }

/* ============ AI SECTION ============ */
.ai-section { overflow: hidden; }
.ai-layout { display: grid; grid-template-columns: 1fr; gap: 48px; }
@media (min-width: 920px) { .ai-layout { grid-template-columns: 1.1fr 1fr; align-items: stretch; } }

.ai-grid { display: flex; flex-direction: column; gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); }
.ai-item { background: var(--ink); padding: 28px 24px; transition: background 0.25s ease; }
.ai-item:hover { background: var(--ink-raised); }
.ai-time { font-family: var(--font-mono); color: var(--violet); font-size: 0.95rem; }
.ai-item h3 { font-size: 1.02rem; margin: 14px 0 10px; }
.ai-item p { font-size: 0.9rem; }

/* ---- terminal ---- */
.terminal {
  background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 8px;
  backdrop-filter: blur(6px); overflow: hidden; display: flex; flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}
.terminal-bar { display: flex; align-items: center; flex-wrap: wrap; row-gap: 6px; gap: 10px; padding: 12px 14px; background: rgba(217, 119, 87, 0.05); border-bottom: 1px solid var(--glass-border); }
.claude-mark {
  color: var(--claude-orange); font-size: 1.05rem; line-height: 1;
  animation: claude-spin 5s linear infinite; transform-origin: center;
}
@keyframes claude-spin { to { transform: rotate(360deg); } }
.terminal-title { font-family: var(--font-display); font-weight: 600; font-size: 0.86rem; color: var(--paper); }
.terminal-badge {
  margin-left: auto; font-family: var(--font-mono); font-size: 0.72rem; color: var(--claude-orange);
  border: 1px solid rgba(217, 119, 87, 0.35); border-radius: 20px; padding: 3px 10px;
}
@media (max-width: 380px) {
  .terminal-badge { margin-left: 34px; }
}
.terminal-body {
  padding: 20px 18px; font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.7;
  color: var(--paper-dim); min-height: 300px; white-space: pre-wrap; flex: 1;
}
.terminal-body .prompt { color: var(--paper); font-weight: 500; }
.terminal-body .tool { color: var(--claude-orange); }
.terminal-body .detail { color: var(--slate); }
.terminal-body .detail-ok { color: var(--green); }
.terminal-body .out { color: var(--slate); }
.terminal-body .ok { color: var(--claude-orange); font-weight: 500; }
.terminal-caret { display: inline-block; width: 7px; height: 1em; background: var(--claude-orange); vertical-align: text-bottom; animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.terminal-input-bar {
  margin: 0 18px 16px; padding: 10px 14px; display: flex; align-items: center; gap: 10px;
  border: 1px solid var(--glass-border); border-radius: 8px; background: rgba(255, 255, 255, 0.02);
}
.input-caret { color: var(--claude-orange); font-family: var(--font-mono); font-size: 0.95rem; }
.input-placeholder { font-family: var(--font-mono); font-size: 0.82rem; color: var(--slate); opacity: 0.7; }
.terminal-caption { padding: 4px 18px 16px; font-size: 0.76rem; color: var(--slate); border-top: 1px solid var(--glass-border); padding-top: 14px; }

/* ---- certifications ---- */
.cert-row { margin-top: 48px; display: flex; gap: 20px; flex-wrap: wrap; }
.cert-card {
  display: flex; align-items: center; gap: 14px; padding: 18px 20px;
  background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 6px;
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
  cursor: pointer; flex: 1 1 300px; max-width: 380px;
}
.cert-card:hover { border-color: var(--violet); transform: translateY(-2px); background: rgba(140, 123, 255, 0.06); }
.cert-icon {
  flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%;
  background: rgba(62, 207, 142, 0.15); color: var(--green);
  display: flex; align-items: center; justify-content: center; font-size: 0.8rem;
}
.cert-info { flex: 1; min-width: 0; }
.cert-card h4 { font-size: 0.95rem; margin-bottom: 4px; }
.cert-card p { font-size: 0.82rem; }
.cert-download {
  flex-shrink: 0; font-family: var(--font-mono); font-size: 0.76rem; color: var(--violet);
  border: 1px solid rgba(140, 123, 255, 0.35); border-radius: 4px; padding: 5px 9px;
  transition: background 0.2s ease, color 0.2s ease;
}
.cert-card:hover .cert-download { background: var(--violet); color: #14100a; }

.cert-group {
  flex: 1 1 300px; max-width: 380px;
  background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 6px;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.cert-group:hover { border-color: var(--violet); }
.cert-group[open].tilt { transform: none !important; }
.cert-group summary {
  display: flex; align-items: center; gap: 14px; padding: 18px 20px;
  cursor: pointer; list-style: none;
}
.cert-group summary::-webkit-details-marker { display: none; }
.cert-group-arrow { flex-shrink: 0; font-family: var(--font-mono); font-size: 1.1rem; color: var(--violet); transition: transform 0.25s ease; }
.cert-group[open] .cert-group-arrow { transform: rotate(45deg); }
.cert-group-list { display: flex; flex-direction: column; padding: 0 20px 16px; }
.cert-group-list a {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 9px 0; font-size: 0.85rem; color: var(--paper-dim);
  border-top: 1px solid var(--line-soft); transition: color 0.15s ease;
}
.cert-group-list a:hover { color: var(--violet); }
.cert-group-list a span { flex-shrink: 0; font-family: var(--font-mono); font-size: 0.76rem; color: var(--slate); }

/* ============ EXPERIENCE ============ */
.now-note {
  display: flex; align-items: flex-start; gap: 12px; margin-bottom: 40px;
  padding: 16px 18px; background: rgba(140, 123, 255, 0.06); border: 1px solid rgba(140, 123, 255, 0.25);
  border-radius: 8px; max-width: var(--col-read);
}
.now-dot { flex-shrink: 0; margin-top: 7px; width: 7px; height: 7px; border-radius: 50%; background: var(--violet); box-shadow: 0 0 0 3px rgba(140, 123, 255, 0.18); animation: pulse-dot 2.4s ease-in-out infinite; }
.now-note p { font-size: 0.95rem; color: var(--paper-dim); }
.now-note strong { color: var(--paper); }
.now-note a { color: var(--violet); border-bottom: 1px solid rgba(140, 123, 255, 0.35); transition: color 0.15s ease, border-color 0.15s ease; }
.now-note a:hover { color: var(--paper); border-color: var(--paper); }

.timeline { position: relative; display: flex; flex-direction: column; }
.timeline-rail { position: absolute; left: 0; top: 0; bottom: 0; width: 1px; background: var(--line-soft); display: none; }
.timeline-rail-fill { position: absolute; top: 0; left: 0; width: 100%; height: 0%; background: linear-gradient(180deg, var(--amber), var(--violet)); transition: height 0.15s linear; }

@media (min-width: 561px) {
  .timeline { padding-left: 22px; }
  .timeline-rail { left: -22px; }
}

.timeline-item { display: grid; grid-template-columns: 120px 1fr; gap: 32px; padding: 28px 0; border-top: 1px solid var(--line-soft); }
.timeline-item:last-child { border-bottom: 1px solid var(--line-soft); }
.timeline-date { font-family: var(--font-mono); font-size: 0.85rem; color: var(--amber); line-height: 1.5; }
.timeline-body h3 { font-size: 1.1rem; margin-bottom: 4px; }
.timeline-org { color: var(--paper-dim); font-size: 0.92rem; margin-bottom: 10px; }
.timeline-body p:last-child { max-width: var(--col-read); font-size: 0.95rem; }

@media (max-width: 560px) { .timeline-item { grid-template-columns: 1fr; gap: 6px; } }

.edu-grid { margin-top: 56px; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); gap: 24px; padding-top: 40px; border-top: 1px solid var(--line-soft); }
.edu-item h3 { font-size: 1rem; margin-bottom: 6px; }
.edu-item p { font-size: 0.88rem; }

/* ============ CONTACT ============ */
.contact { text-align: left; padding-bottom: 120px; overflow: hidden; }
.contact-inner { max-width: var(--col-read); position: relative; z-index: 2; }
.contact h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); line-height: 1.2; margin-bottom: 16px; }
.contact-lead { font-size: 1rem; max-width: 54ch; margin-bottom: 40px; }
.contact-links { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 20px; font-family: var(--font-mono); font-size: 0.98rem; }
.contact-links a { display: inline-block; padding: 10px 0; border-bottom: 1px solid var(--line); transition: border-color 0.15s ease, color 0.15s ease; }
.contact-links a:hover { border-color: var(--amber); color: var(--amber); }

.copy-email-btn {
  font-family: var(--font-mono); font-size: 0.76rem; color: var(--slate); background: none; cursor: pointer;
  border: 1px solid var(--line); border-radius: 4px; padding: 6px 10px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.copy-email-btn:hover, .copy-email-btn:focus-visible { color: var(--amber); border-color: var(--amber); }
.copy-email-btn.copied { color: var(--green); border-color: var(--green); }
.contact-location { color: var(--slate); }
.contact-social { margin-top: 16px; display: flex; gap: 20px; }
.social-link { display: inline-block; padding: 9px 2px; font-size: 0.9rem; color: var(--paper-dim); border-bottom: 1px solid var(--line); transition: color 0.15s ease, border-color 0.15s ease; }
.social-link:hover { color: var(--amber); border-color: var(--amber); }
.social-placeholder { display: inline-block; padding: 9px 2px; font-size: 0.9rem; color: var(--slate); border-bottom: 1px solid transparent; }
.social-placeholder:hover { color: var(--paper); border-color: var(--line); }

/* ============ FOOTER ============ */
.site-footer { border-top: 1px solid var(--line-soft); padding: 28px 32px; text-align: center; font-size: 0.82rem; color: var(--slate); position: relative; z-index: 2; }
.site-footer a { display: inline-block; padding: 8px 2px; color: var(--slate); border-bottom: 1px solid var(--line); transition: color 0.15s ease, border-color 0.15s ease; }
.site-footer a:hover { color: var(--amber); border-color: var(--amber); }

/* ============ BACK TO TOP ============ */
.back-to-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: var(--amber); border: none; color: #14100a; cursor: pointer;
  opacity: 0; transform: translateY(8px); pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, box-shadow 0.2s ease;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover, .back-to-top:focus-visible { box-shadow: 0 8px 28px var(--amber-glow); }

/* ============ DOT NAV (section progress) ============ */
.dot-nav {
  position: fixed; right: 26px; top: 50%; transform: translateY(-50%); z-index: 90;
  display: none; flex-direction: column; gap: 16px;
}
.dot-nav a {
  position: relative; width: 9px; height: 9px; border-radius: 50%;
  background: var(--line); border: 1px solid transparent;
  transition: background 0.25s ease, transform 0.25s ease;
}
.dot-nav a:hover, .dot-nav a:focus-visible { background: var(--paper-dim); transform: scale(1.3); }
.dot-nav a.active { background: var(--amber); transform: scale(1.35); box-shadow: 0 0 0 3px var(--amber-glow); }
.dot-nav a::after {
  content: attr(data-label); position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); font-size: 0.74rem; color: var(--paper);
  background: var(--ink-raised); border: 1px solid var(--glass-border); border-radius: 4px;
  padding: 5px 10px; white-space: nowrap; opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.dot-nav a:hover::after, .dot-nav a:focus-visible::after { opacity: 1; transform: translateY(-50%) translateX(-4px); }
@media (min-width: 1240px) and (min-height: 620px) { .dot-nav { display: flex; } }