/* ============================================================================
   saidurga.me — site styles (built on tokens.css)
   ========================================================================== */

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  background: var(--bg);
  transition: background var(--dur-slow) var(--ease-out);
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* anchor offset for fixed nav */
:target, section[id] { scroll-margin-top: 100px; }
header[id] { scroll-margin-top: 0; }

body {
  margin: 0;
  background: transparent;
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background var(--dur-slow) var(--ease-out), color var(--dur-slow) var(--ease-out);
  overflow-x: clip;
}

#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  pointer-events: none;
  width: 100%;
  height: 100%;
}

a { color: inherit; }
::selection { background: color-mix(in srgb, var(--brand-vivid) 26%, transparent); }

.wrap { width: 100%; max-width: var(--maxw-content); margin: 0 auto; padding: 0 28px; }

/* ---- shared type ---------------------------------------------------------- */
.eyebrow {
  font-family: var(--font-mono); font-size: var(--text-xs);
  letter-spacing: var(--tracking-mono); text-transform: uppercase;
  color: var(--brand-vivid); display: inline-flex; align-items: center; gap: 9px;
  margin: 0;
}
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head h2 {
  font-family: var(--font-display); font-weight: var(--w-bold);
  font-size: clamp(32px, 5vw, 52px); line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight); color: var(--fg);
  margin: 18px 0 16px;
}
.section-head p { font-size: var(--text-lg); color: var(--fg-2); margin: 0; }
.grad { background: var(--brand-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }

section { padding: clamp(72px, 10vw, 112px) 0; position: relative; }
.tint { background: var(--bg-subtle); }

/* ---- nav ------------------------------------------------------------------ */
.nav {
  position: fixed; top: 16px; left: 50%; transform: translateX(-50%);
  z-index: 100; width: calc(100% - 32px); max-width: var(--maxw-content);
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 12px 12px 12px 24px; border-radius: var(--radius-full);
  background: var(--surface-glass); backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-base) var(--ease-out), background var(--dur-slow) var(--ease-out);
}
.nav.scrolled { box-shadow: var(--shadow-md); }
.nav__brand { text-decoration: none; display: flex; align-items: center; }
.nav__logo {
  height: 52px;
  width: auto;
  display: block;
  transition: transform var(--dur-fast) var(--ease-out);
}
.nav__brand:hover .nav__logo { transform: translateY(-1px) scale(1.02); }
.nav__links { display: flex; align-items: center; gap: 4px; }
.nav__links a {
  font-family: var(--font-mono); font-size: 15px; color: var(--fg-2);
  text-decoration: none; padding: 10px 16px; border-radius: var(--radius-full);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.nav__links a:hover { color: var(--fg); background: color-mix(in srgb, var(--brand-vivid) 9%, transparent); }
.nav__right { display: flex; align-items: center; gap: 8px; }
.mobile-only { display: none; }

@media (max-width: 920px) {
  .mobile-only { display: inline-grid; }
}

.icon-btn {
  width: 44px; height: 44px; display: inline-grid; place-items: center;
  border-radius: var(--radius-full); border: 1px solid var(--border);
  background: var(--surface); color: var(--fg-2); cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.icon-btn:hover { color: var(--brand-vivid); border-color: var(--brand-vivid); }
.icon-btn:active { transform: scale(.94); }

/* ---- buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 14px; font-weight: var(--w-medium);
  padding: 13px 22px; border-radius: var(--radius-full); cursor: pointer;
  text-decoration: none; border: 1px solid transparent; white-space: nowrap;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--brand-gradient); color: #fff; box-shadow: var(--shadow-glow); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-primary:active { transform: scale(.985); }
.btn-ghost { background: var(--surface); border-color: var(--border-strong); color: var(--fg); }
.btn-ghost:hover { border-color: var(--brand-vivid); transform: translateY(-2px); color: var(--brand-vivid); }
.btn-ghost:active { transform: scale(.985); }
.btn-sm { padding: 0 18px; font-size: 14px; height: 44px; display: inline-flex; align-items: center; }

/* focus styles for a11y + polish */
a:focus-visible, button:focus-visible, .btn:focus-visible, .icon-btn:focus-visible, .social:focus-visible, .kudos:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--ring-focus);
  border-radius: inherit;
}
.icon-btn:focus-visible { border-color: var(--brand-vivid); }

/* ---- hero (content left; right graphic panel with theme-aware bg + light/dark images; soft mask for seamless blend, mouse tilt) */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 96px 0 64px;
  background: radial-gradient(circle at 12% 24%, var(--hero-glow-1) 0%, transparent 55%),
              radial-gradient(circle at 88% 76%, var(--hero-glow-2) 0%, transparent 55%);
}
.hero-inner {
  display: flex;
  align-items: center;
  gap: clamp(32px, 5vw, 64px);
  width: 100%;
  min-height: 560px; /* give the theme-aware graphic more vertical presence + breathing room */
}
.hero-content {
  flex: 1;
  max-width: 540px;
}
.hero-graphic {
  flex: 1.2;
  min-width: 0;
  position: relative;
  align-self: center;
  aspect-ratio: 4 / 5;
  max-height: 600px;
  background: linear-gradient(135deg, rgba(4, 176, 205, 0.05) 0%, rgba(6, 148, 215, 0.05) 100%);
  border: 1px solid rgba(6, 148, 215, 0.12);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 12%, #000 100%);
          mask-image: linear-gradient(90deg, transparent 0%, #000 12%, #000 100%);
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
[data-theme="dark"] .hero-graphic {
  background: linear-gradient(135deg, rgba(4, 176, 205, 0.12) 0%, rgba(6, 148, 215, 0.12) 100%);
  border-color: rgba(56, 179, 232, 0.2);
  box-shadow: var(--shadow-lg);
}
.hero-graphic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 59% 36%; /* face centered nicely in the visible area after the left mask; shows good portion of hiker/cutouts on dark image */
  display: block;
  mix-blend-mode: multiply; /* removes white background in light mode */
  filter: saturate(1.18) contrast(1.02) brightness(1.01);
  transition: filter var(--dur-slow) var(--ease-out);
}
[data-theme="dark"] .hero-graphic img {
  mix-blend-mode: normal; /* keep dark mode as is since it works fine */
  filter: saturate(1.1) contrast(1.02);
}
.hero h1 {
  font-family: var(--font-display); font-weight: var(--w-bold);
  font-size: clamp(42px, 7vw, 72px); line-height: .98;
  letter-spacing: var(--tracking-tight); margin: 12px 0 18px; color: var(--fg);
}
.hero__lead { font-size: var(--text-lg); line-height: 1.65; color: var(--fg-2); max-width: 560px; margin: 0 0 28px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.hero__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; font-family: var(--font-mono); font-size: 13px; color: var(--fg-3); }
.hero__meta a { color: var(--fg-3); text-decoration: none; display: inline-flex; align-items: center; gap: 7px; transition: color var(--dur-fast) var(--ease-out); }
.hero__meta a:hover { color: var(--brand-vivid); }
.hero__meta .sep { color: var(--border-strong); }
.hero__meta svg, .hero__meta .brand-ico { width: 14px; height: 14px; }

/* scroll caret */
.hero__scroll { position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%); z-index: 3; color: var(--fg-3); font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.hero__scroll svg { width: 18px; height: 18px; animation: bob 2.2s var(--ease-in-out) infinite; }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(5px); } }
@media (prefers-reduced-motion: reduce) { .hero__scroll svg { animation: none; } }

/* ---- stats band ----------------------------------------------------------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { text-align: center; padding: 8px 0; }
.stat__val { font-family: var(--font-display); font-weight: var(--w-bold); font-size: clamp(34px, 5vw, 54px); line-height: 1; letter-spacing: var(--tracking-tight); }
.stat__lbl { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-mono); text-transform: uppercase; color: var(--fg-3); margin-top: 10px; }

/* ---- cards / grids -------------------------------------------------------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 30px; overflow: hidden;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.card::after {
  content: ""; position: absolute; top: -40%; right: -40%; width: 60%; height: 60%;
  background: radial-gradient(circle, color-mix(in srgb, var(--brand-vivid) 16%, transparent), transparent 70%);
  opacity: 0; transition: opacity var(--dur-slow) var(--ease-out); pointer-events: none;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--brand-vivid) 40%, var(--border)); }
.card:hover::after { opacity: 1; }

/* Mouse-driven 3D tilt for interactive product-designer feel on cards */
.tilt-card {
  transition: transform 0.1s ease-out;
  transform-style: preserve-3d;
}
.card__icon { width: 46px; height: 46px; border-radius: var(--radius-md); display: grid; place-items: center; background: var(--brand-gradient-soft); border: 1px solid var(--border); color: var(--brand-vivid); margin-bottom: 22px; }
[data-theme="dark"] .card__icon { background: color-mix(in srgb, var(--brand-vivid) 14%, transparent); }
.card__icon svg { width: 24px; height: 24px; }
.card h3 { font-family: var(--font-display); font-weight: var(--w-semibold); font-size: var(--text-xl); margin: 0 0 12px; color: var(--fg); }
.card p { color: var(--fg-2); margin: 0 0 22px; font-size: var(--text-base); }

/* tags */
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--font-mono); font-size: var(--text-xs); padding: 5px 11px;
  border-radius: var(--radius-full); background: color-mix(in srgb, var(--accent) 11%, transparent);
  color: var(--accent-deep); border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
}
[data-theme="dark"] .tag { color: var(--accent-glow); }
.tag--plain { background: var(--bg-subtle); color: var(--fg-2); border-color: var(--border); }

/* ---- patent / cert cards -------------------------------------------------- */
.kudos { display: flex; align-items: flex-start; gap: 16px; padding: 24px; border-radius: var(--radius-lg); text-decoration: none; transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out); }
.kudos--patent { background: color-mix(in srgb, var(--brand-vivid) 7%, var(--surface)); border: 1px solid color-mix(in srgb, var(--brand-vivid) 28%, transparent); }
.kudos--cert { background: var(--surface); border: 1px solid var(--border); }
.kudos:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.kudos--patent:hover { border-color: var(--brand-vivid); }
.kudos__ico { width: 44px; height: 44px; flex: none; border-radius: var(--radius-md); display: grid; place-items: center; }
.kudos--patent .kudos__ico { background: var(--brand-gradient); color: #fff; }
.kudos--cert .kudos__ico { background: var(--bg-subtle); color: var(--fg-2); border: 1px solid var(--border); }
.kudos__ico svg { width: 22px; height: 22px; }
.kudos__top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.kudos__title { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: var(--w-semibold); color: var(--fg); line-height: 1.35; display: block; }
.kudos--patent .kudos__title { color: var(--brand-vivid); }
.kudos__sub { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--fg-3); margin-top: 7px; line-height: 1.5; }
.kudos__ext { flex: none; }
.kudos__ext { color: var(--fg-3); transition: color var(--dur-fast) var(--ease-out); }
.kudos--patent:hover .kudos__ext { color: var(--brand-vivid); }

/* ---- timeline ------------------------------------------------------------- */
.timeline { position: relative; }
.timeline::before { content: ""; position: absolute; left: 130px; top: 8px; bottom: 8px; width: 1px; background: linear-gradient(var(--border), transparent); }
.tl-item { position: relative; display: grid; grid-template-columns: 130px 1fr; gap: 0; margin-bottom: 28px; }
.tl-period { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--fg-3); padding-top: 30px; padding-right: 28px; text-align: right; }
.tl-body { position: relative; padding-left: 40px; }
.tl-dot { position: absolute; left: -5px; top: 32px; width: 11px; height: 11px; border-radius: 50%; background: var(--brand-gradient); border: 3px solid var(--bg); box-shadow: 0 0 0 1px var(--border); }
.exp-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px 30px; transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out); }
.exp-card:hover { border-color: color-mix(in srgb, var(--brand-vivid) 32%, var(--border)); box-shadow: var(--shadow-md); }
.exp-card h3 { font-family: var(--font-display); font-weight: var(--w-semibold); font-size: var(--text-xl); margin: 0; color: var(--fg); }
.exp-card .company { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--brand-vivid); margin: 5px 0 2px; }
.exp-card .place { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--fg-3); margin: 0 0 18px; }
.exp-list { list-style: none; margin: 0 0 18px; padding: 0; display: flex; flex-direction: column; gap: 13px; }
.exp-list li { display: flex; gap: 11px; font-size: var(--text-sm); color: var(--fg-2); line-height: 1.6; }
.exp-list .arrow { color: var(--accent); font-family: var(--font-mono); flex: none; margin-top: 1px; }
.awards { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.award { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: var(--text-xs); padding: 5px 11px; border-radius: var(--radius-full); background: color-mix(in srgb, var(--warning) 13%, transparent); color: var(--warning); border: 1px solid color-mix(in srgb, var(--warning) 30%, transparent); }
.award svg { width: 12px; height: 12px; }

/* ---- skills --------------------------------------------------------------- */
.skill-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; transition: border-color var(--dur-base) var(--ease-out); }
.skill-card:hover { border-color: color-mix(in srgb, var(--brand-vivid) 28%, var(--border)); }
.skill-card h3 { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-mono); text-transform: uppercase; color: var(--brand-vivid); margin: 0 0 16px; }
.chip { font-family: var(--font-mono); font-size: var(--text-sm); padding: 7px 13px; border-radius: var(--radius-md); background: var(--bg-subtle); border: 1px solid var(--border); color: var(--fg); cursor: default; transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out); }
.chip:hover { transform: translateY(-2px); border-color: var(--brand-vivid); color: var(--brand-vivid); }

/* ---- contact -------------------------------------------------------------- */
.contact { text-align: center; }
.contact .section-head { margin-left: auto; margin-right: auto; text-align: center; }
.contact .eyebrow { justify-content: center; }
.contact h2 { text-align: center; font-family: var(--font-display); font-weight: var(--w-bold); font-size: clamp(34px, 6vw, 60px); line-height: 1.05; letter-spacing: var(--tracking-tight); margin: 18px 0 18px; }
.connect-description {
  text-align: center;
  margin: 0 auto 40px;
  max-width: 600px; /* Keeps line length readable when centered */
  font-size: var(--text-lg);
  color: var(--fg-2);
}
.socials {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-decoration: none;
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.social:hover { transform: translateY(-4px); border-color: var(--brand-vivid); box-shadow: var(--shadow-md); }
.social__ico { width: 38px; height: 38px; flex: none; border-radius: var(--radius-md); display: grid; place-items: center; background: var(--bg-subtle); color: var(--brand-vivid); border: 1px solid var(--border); transition: transform var(--dur-base) var(--ease-spring); }
.social:hover .social__ico { transform: rotate(6deg) scale(1.05); }
.social__ico svg, .social__ico .brand-ico { width: 19px; height: 19px; }
.social__lbl { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--fg-3); }
.social__val {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--fg);
  word-break: break-all;
}

/* ---- footer --------------------------------------------------------------- */
.footer { border-top: 1px solid var(--border); padding: 40px 0; }
.footer .wrap { text-align: center; }
.footer__tag { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--fg-3); }

/* brand icon sizing */
.brand-ico { display: inline-flex; line-height: 0; }
.brand-ico svg { width: 100%; height: 100%; fill: currentColor; }

/* ---- reveal animation ----------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity var(--dur-slower) var(--ease-out), transform var(--dur-slower) var(--ease-out); }
.reveal.in { opacity: 1 !important; transform: none !important; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1 !important; transform: none !important; transition: none; } }

/* ---- responsive ----------------------------------------------------------- */
@media (max-width: 920px) {
  .nav__links {
    display: none;
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    background: var(--surface-glass);
    backdrop-filter: blur(20px) saturate(1.6);
    -webkit-backdrop-filter: blur(20px) saturate(1.6);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 12px;
    gap: 4px;
    box-shadow: var(--shadow-lg);
    z-index: 101;
  }
  .nav.nav-open .nav__links {
    display: flex;
  }
  .nav__links a {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
  }
  .grid-3 { grid-template-columns: 1fr; }
  .hero { padding-top: 80px; }
  .nav { padding: 6px 6px 6px 14px; border-radius: 999px; }
  .hero-inner {
    flex-direction: column;
    gap: 32px;
    min-height: auto;
  }
  .hero-content {
    flex: none;
    max-width: 100%;
  }
  .hero-graphic {
    width: 100%;
    aspect-ratio: auto;
    max-height: 460px;
    align-self: auto;
    -webkit-mask-image: none;
            mask-image: none;
    box-shadow: none;
    border: none;
    background: transparent;
  }
  .hero-graphic img {
    height: auto;
    max-height: 460px;
    object-position: 50% 30%; /* balanced crop for the black-illustration art on full-width mobile view */
    -webkit-mask-image: none;
            mask-image: none;
    filter: saturate(1.1) contrast(1.02);
  }
  .timeline::before { left: 5px; }
  .tl-item { grid-template-columns: 1fr; }
  .tl-period { text-align: left; padding: 0 0 10px 26px; }
  .tl-body { padding-left: 26px; }
  .tl-dot { left: 0; top: 4px; }
  .social { padding: 12px 14px; gap: 12px; }
  .hero__scroll { display: none; }
}
@media (max-width: 560px) {
  .stats { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; }
  .grid-2 { grid-template-columns: 1fr; }
  .socials { grid-template-columns: 1fr; }
  .social__val { font-size: 13px; }
  .wrap { padding: 0 20px; }
}