/* ==========================================================
   FOUNDRY-DERIVED DESIGN SYSTEM — Pinayur Sridhar Vedant
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&family=Inter:wght@400;500;600&family=Archivo+Black&display=swap');

:root {
  /* --- Foundry tokens --- */
  --color-ember-orange: #ff4d00;
  --color-foundry-black: #121212;
  --color-chalk-white: #e2e8f0;
  --color-bone-white: #efefef;
  --color-soot: #3a3a3a;
  --color-ash: #747474;

  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-body: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-display: 'Archivo Black', 'Arial Black', ui-sans-serif, sans-serif;

  --radius-sm: 2.8px;
  --radius-lg: 8px;

  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-20: 20px;
  --space-24: 24px;
  --space-100: 100px;

  --page-max-width: 1440px;
  --sidebar-width: 220px;
  --section-gap: 64px;

  /* --- theme (dark default) --- */
  --canvas: var(--color-foundry-black);
  --canvas-raised: #171717;
  --text-primary: var(--color-bone-white);
  --text-muted: var(--color-ash);
  --border-hairline: var(--color-chalk-white);
  --border-soft: var(--color-soot);
  --accent: var(--color-ember-orange);
  --invert-fill: var(--color-bone-white);
  --invert-text: var(--color-foundry-black);
  --border-hairline-op: rgba(226, 232, 240, 0.16);

  color-scheme: dark;
}

html[data-theme="light"] {
  --canvas: #f1efe9;
  --canvas-raised: #e8e5dd;
  --text-primary: #17140f;
  --text-muted: #6b665c;
  --border-hairline: #17140f;
  --border-soft: #c9c3b6;
  --invert-fill: #17140f;
  --invert-text: #f1efe9;
  --border-hairline-op: rgba(23, 20, 15, 0.14);
  color-scheme: light;
}

* { 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;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

::selection { background: var(--accent); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.hairline-top { border-top: 1px solid var(--border-hairline-op); }

/* ==========================================================
   TICKER
   ========================================================== */
.ticker {
  position: sticky;
  top: 0;
  z-index: 60;
  width: 100%;
  height: 34px;
  background: var(--canvas);
  border-bottom: 1px solid var(--border-hairline-op);
  overflow: hidden;
  display: flex;
  align-items: center;
}
.ticker__track {
  display: flex;
  white-space: nowrap;
  animation: ticker-scroll 32s linear infinite;
  will-change: transform;
}
.ticker__item {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  padding: 0 var(--space-20);
  display: inline-flex;
  align-items: center;
  gap: var(--space-20);
}
.ticker__sep { color: var(--accent); font-size: 10px; }
@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ==========================================================
   LAYOUT SHELL
   ========================================================== */
.shell {
  display: flex;
  max-width: var(--page-max-width);
  margin: 0 auto;
}

.main {
  flex: 1;
  min-width: 0;
  padding-left: var(--sidebar-width);
}

/* ==========================================================
   SIDEBAR
   ========================================================== */
.sidebar {
  position: fixed;
  top: 34px;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  border-right: 1px solid var(--border-hairline-op);
  padding: var(--space-24) var(--space-20);
  display: flex;
  flex-direction: column;
  z-index: 50;
  background: var(--canvas);
}

.logo {
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.05;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin-bottom: var(--space-100);
}
.logo span { display: block; }
.logo .dot { color: var(--accent); }

.nav-group { margin-bottom: var(--space-24); }
.nav-group__header {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: var(--space-12);
}
.nav-group__header .bracket { color: var(--text-primary); font-weight: 400; }

.nav-tags { display: flex; flex-direction: column; gap: var(--space-8); align-items: flex-start; }

.nav-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  color: var(--text-primary);
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  width: 100%;
}
.nav-tag:hover { border-color: var(--border-hairline-op); }
.nav-tag.is-active {
  background: var(--invert-fill);
  color: var(--invert-text);
}

.nav-tag--ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border-hairline-op);
}
.nav-tag--ghost:hover { border-color: var(--accent); color: var(--accent); }

.sidebar__footer {
  margin-top: auto;
  padding-top: var(--space-20);
  border-top: 1px solid var(--border-hairline-op);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.sidebar__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

/* --- bulb toggle --- */
.bulb-toggle {
  position: relative;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-hairline-op);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.bulb-toggle svg { width: 18px; height: 18px; overflow: visible; }
.bulb-filament { transition: opacity 0.3s ease; opacity: 0; }
.bulb-glow {
  transition: opacity 0.4s ease, transform 0.4s ease;
  opacity: 0;
  transform: scale(0.6);
}
html[data-theme="light"] .bulb-filament { opacity: 1; }
html[data-theme="light"] .bulb-glow { opacity: 0.55; transform: scale(1); }
.bulb-toggle:active svg { transform: scale(0.92); }

/* ==========================================================
   MOBILE NAV
   ========================================================== */
.mobile-bar {
  display: none;
  position: sticky;
  top: 34px;
  z-index: 55;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-12) var(--space-20);
  border-bottom: 1px solid var(--border-hairline-op);
  background: var(--canvas);
}
.mobile-bar .logo { margin: 0; font-size: 16px; }
.mobile-bar__controls { display: flex; align-items: center; gap: var(--space-12); }

.menu-btn {
  width: 34px; height: 34px;
  border: 1px solid var(--border-hairline-op);
  border-radius: var(--radius-sm);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
}
.menu-btn span { width: 16px; height: 1px; background: var(--text-primary); transition: transform 0.25s ease, opacity 0.25s ease; }
.menu-btn.is-open span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.menu-btn.is-open span:nth-child(2) { opacity: 0; }
.menu-btn.is-open span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.mobile-drawer {
  display: none;
  position: fixed;
  inset: 68px 0 0 0;
  z-index: 54;
  background: var(--canvas);
  padding: var(--space-24) var(--space-20);
  overflow-y: auto;
}
.mobile-drawer.is-open { display: block; }
.mobile-drawer .nav-tag { display: block; font-size: 14px; padding: 12px; margin-bottom: 8px; }

/* ==========================================================
   SECTION SCAFFOLD (Font-Specimen-Card pattern)
   ========================================================== */
.specimen {
  border-top: 1px solid var(--border-hairline-op);
  padding: 56px var(--space-24) var(--section-gap);
}
.specimen:first-of-type { border-top: none; }

.strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-20);
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border-hairline-op);
  margin-bottom: var(--space-24);
  flex-wrap: wrap;
}
.strip__left, .strip__center, .strip__right {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.strip__left { color: var(--text-primary); font-weight: 700; }
.strip__center { color: var(--text-muted); }
.strip__right { margin-left: auto; }

/* ==========================================================
   BUTTONS
   ========================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 10px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  transition: background 0.15s ease, color 0.15s ease;
  min-height: 40px;
}
.btn:hover { background: var(--accent); color: #121212; }

.btn--ghost {
  border-color: var(--border-hairline);
  color: var(--text-primary);
}
.btn--ghost:hover { background: var(--text-primary); color: var(--canvas); }

.btn--disabled, .btn--disabled:hover {
  border-color: var(--border-soft);
  color: var(--text-muted);
  background: transparent;
  cursor: not-allowed;
  opacity: 0.6;
}

.btn-row { display: flex; gap: var(--space-12); flex-wrap: wrap; }

/* ==========================================================
   HERO
   ========================================================== */
.hero {
  padding: 48px var(--space-24) var(--section-gap);
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: var(--space-24);
  align-items: center;
}

.hero__content { min-width: 0; }

.hero__eyebrow-row {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-20);
}
.hero__eyebrow-row .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.hero__name {
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: clamp(2.6rem, 7.4vw, 6.4rem);
  line-height: 0.96;
  letter-spacing: 0.005em;
  margin: 0 0 var(--space-20);
}
.hero__name .accent { color: var(--accent); }

.hero__tagline {
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.55;
  color: var(--text-muted);
  max-width: 52ch;
  margin: 0 0 var(--space-24);
}

.hero__visual {
  position: relative;
  border: 1px solid var(--border-hairline-op);
  border-radius: var(--radius-lg);
  aspect-ratio: 1 / 1.05;
  overflow: hidden;
  justify-self: end;
  width: min(100%, 320px);
}
.hero__visual img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  display: block;
}
.hero__visual:hover img { transform: scale(1.04); }
.hero__visual-tag {
  position: absolute;
  bottom: var(--space-8);
  left: var(--space-8);
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 8px;
  border: 1px solid var(--color-bone-white);
  color: var(--color-bone-white);
  background: rgba(18,18,18,0.5);
  border-radius: var(--radius-sm);
  z-index: 1;
}

/* ==========================================================
   ABOUT
   ========================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-24);
  align-items: start;
}
.about__display {
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1;
  margin: 0 0 var(--space-20);
}
.about__body { color: var(--text-muted); max-width: 56ch; font-size: 15px; line-height: 1.7; }

.edu-card {
  border: 1px solid var(--border-hairline-op);
  border-radius: var(--radius-lg);
  padding: var(--space-20);
  margin-bottom: var(--space-12);
}
.edu-card__top { display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-12); }
.edu-card__school { font-weight: 600; font-size: 15px; }
.edu-card__degree { color: var(--text-muted); font-size: 13px; margin-top: 4px; }
.edu-card__period { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); text-transform: uppercase; white-space: nowrap; }
.edu-card__stat {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 22px;
  font-weight: 700;
}
.edu-card__stat-label { font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); text-transform: uppercase; }

/* ==========================================================
   EXPERIENCE
   ========================================================== */
.exp-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-24) var(--space-100);
  align-items: start;
}
.exp__metric {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: clamp(3.5rem, 9vw, 7rem);
  line-height: 0.9;
  margin: 0;
}
.exp__metric-label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-top: var(--space-8);
  max-width: 26ch;
}
.exp__role { margin-bottom: var(--space-20); }
.exp__company { font-size: 20px; font-weight: 600; margin: 0; }
.exp__meta { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; margin-top: 6px; }
.exp__bullets { display: flex; flex-direction: column; gap: var(--space-12); }
.exp__bullets li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-muted);
}
.exp__bullets li::before {
  content: "";
  position: absolute; left: 0; top: 8px;
  width: 8px; height: 1px;
  background: var(--accent);
}
.exp__bullets strong { color: var(--text-primary); font-weight: 600; }

/* ==========================================================
   PROJECTS
   ========================================================== */
.project {
  margin-bottom: 56px;
}
.project:last-child { margin-bottom: 0; }

.project__strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-12);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-hairline-op);
  margin-bottom: var(--space-24);
}
.project__name-wrap { display: flex; align-items: baseline; gap: var(--space-12); }
.project__index { font-family: var(--font-mono); color: var(--accent); font-size: 12px; }
.project__name { font-family: var(--font-mono); font-weight: 700; font-size: 14px; text-transform: uppercase; letter-spacing: 0.03em; }
.project__category { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; }

.project__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-24) var(--space-100);
  align-items: start;
}

.project__metric {
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: clamp(3rem, 7.2vw, 5.6rem);
  line-height: 0.92;
  margin: 0;
}
.project__metric-label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin: var(--space-8) 0 var(--space-20);
}

.project__stats {
  display: flex;
  gap: var(--space-24);
  flex-wrap: wrap;
  margin-top: var(--space-20);
}
.project__stat-value { font-family: var(--font-mono); font-weight: 700; font-size: 18px; color: var(--text-primary); }
.project__stat-label { font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; }

.project__tagline { font-weight: 600; font-size: 15px; margin: 0 0 var(--space-12); }
.project__text { color: var(--text-muted); font-size: 14.5px; line-height: 1.7; margin: 0 0 var(--space-20); }
.project__text + .project__text { margin-top: -8px; }

.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-8); margin-bottom: var(--space-20); }
.tech-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 5px 9px;
  border: 1px solid var(--border-hairline-op);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

/* ==========================================================
   SKILLS
   ========================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-24);
}
.skill-cat__header {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-12);
}
.skill-cat__header .bracket { color: var(--accent); }
.skill-tags { display: flex; flex-wrap: wrap; gap: var(--space-8); }
.skill-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline-op);
  color: var(--text-primary);
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.skill-tag:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* ==========================================================
   ACHIEVEMENTS
   ========================================================== */
.achv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-20);
}
.achv-card {
  border: 1px solid var(--border-hairline-op);
  border-radius: var(--radius-lg);
  padding: var(--space-20);
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}
.achv-card__marker {
  width: 18px; height: 18px;
  border-left: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
}
.achv-card__title { font-weight: 600; font-size: 15px; margin: 0; }
.achv-card__detail { color: var(--text-muted); font-size: 13.5px; line-height: 1.6; margin: 0; flex: 1; }

/* ==========================================================
   CERTIFICATIONS
   ========================================================== */
.cert-list { display: flex; flex-direction: column; }
.cert-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-20);
  padding: var(--space-20) 0;
  border-top: 1px solid var(--border-hairline-op);
  flex-wrap: wrap;
}
.cert-row:last-child { border-bottom: 1px solid var(--border-hairline-op); }
.cert-row__name { font-weight: 600; font-size: 14.5px; margin: 0 0 4px; }
.cert-row__meta { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; }

/* ==========================================================
   CONTACT / FOOTER
   ========================================================== */
.contact__lead {
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.02;
  margin: 0 0 var(--space-24);
  max-width: 16ch;
}
.contact__lead .accent { color: var(--accent); }
.footer {
  padding: var(--space-24);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-12);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ==========================================================
   REVEAL ANIMATION
   ========================================================== */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ==========================================================
   RESPONSIVE
   ========================================================== */
@media (max-width: 1024px) {
  .about-grid, .exp-grid, .project__body { grid-template-columns: 1fr; }
  .exp-grid { gap: var(--space-24); }
}

@media (max-width: 860px) {
  .sidebar { display: none; }
  .main { padding-left: 0; }
  .mobile-bar { display: flex; }
  .hero { grid-template-columns: 1fr; }
  .hero__visual { justify-self: start; width: 180px; order: -1; margin-bottom: var(--space-20); }
}

@media (max-width: 560px) {
  .specimen { padding: 40px var(--space-20) 48px; }
  .hero { padding: 32px var(--space-20) 48px; }
  .strip { align-items: flex-start; }
  .strip__right { width: 100%; margin-left: 0; }
  .footer { flex-direction: column; align-items: flex-start; }
}