/* ============================================================
   Shivam Jainer — Personal site
   Design tokens + base + components
   ============================================================ */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;1,6..72,400&display=swap');

/* ---------- Tokens: dark (default) ---------- */
:root {
  --navy:        #0B1220;
  --navy-900:    #0B1220;
  --navy-800:    #0E1626;
  --navy-700:    #121C30;
  --navy-600:    #16213A;

  --bg:          #0B1220;
  --bg-elev:     #0F1729;
  --surface:     rgba(255,255,255,0.025);
  --surface-2:   rgba(255,255,255,0.045);
  --border:      rgba(255,255,255,0.09);
  --border-soft: rgba(255,255,255,0.055);

  --text:        #ECF1F8;
  --text-dim:    #9FAEC4;
  --text-faint:  #647590;

  --accent:      #2563EB;   /* Electric Blue — themeable */
  --accent-rgb:  37,99,235;
  --accent-soft: rgba(37,99,235,0.14);
  --accent-line: rgba(37,99,235,0.32);
  --emerald:     #10B981;
  --emerald-rgb: 16,185,129;

  --white:       #FFFFFF;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 12px 40px -12px rgba(0,0,0,.6);
  --shadow-lg: 0 40px 90px -30px rgba(0,0,0,.75);

  --maxw: 1180px;
  --radius: 16px;
  --radius-lg: 22px;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Space Grotesk', 'Inter', sans-serif;
  --font-serif: 'Newsreader', Georgia, serif;

  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ---------- Tokens: light ---------- */
:root[data-theme="light"] {
  --bg:          #FBFCFE;
  --bg-elev:     #FFFFFF;
  --surface:     rgba(11,18,32,0.018);
  --surface-2:   rgba(11,18,32,0.035);
  --border:      rgba(11,18,32,0.10);
  --border-soft: rgba(11,18,32,0.06);

  --text:        #0B1220;
  --text-dim:    #475569;
  --text-faint:  #94A3B8;

  --accent-soft: rgba(37,99,235,0.10);
  --accent-line: rgba(37,99,235,0.22);

  --shadow-md: 0 12px 40px -16px rgba(11,18,32,.18);
  --shadow-lg: 0 40px 90px -34px rgba(11,18,32,.22);
}

/* font-pairing tweak hooks */
:root[data-font="grotesk-display"] { --font-display: 'Space Grotesk', sans-serif; }
:root[data-font="serif-display"]   { --font-display: 'Newsreader', serif; }
:root { --font-display: 'Inter', sans-serif; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
  overflow-x: hidden;
  transition: background .5s var(--ease), color .5s var(--ease);
}

h1,h2,h3,h4 { font-family: var(--font-display); margin: 0; line-height: 1.05; letter-spacing: -0.02em; font-weight: 800; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.mono { font-family: var(--font-mono); font-feature-settings: "tnum"; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
section { position: relative; }

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

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px clamp(20px,4vw,40px);
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .4s var(--ease), background .4s var(--ease), padding .4s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--border-soft); padding-top: 12px; padding-bottom: 12px; }
.nav__brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: -.01em; }
.nav__mark {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 50%, var(--emerald)));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-family: var(--font-mono);
  font-size: 15px; box-shadow: 0 6px 20px -8px var(--accent);
}
.nav__brand small { display:block; font-size: 11px; color: var(--text-faint); font-weight: 500; letter-spacing: .02em; margin-top: -2px; }
.nav__links { display: flex; align-items: center; gap: 4px; }
.nav__links a {
  font-size: 13.5px; color: var(--text-dim); padding: 8px 13px; border-radius: 9px;
  font-weight: 500; transition: color .2s, background .2s;
}
.nav__links a:hover { color: var(--text); background: var(--surface-2); }
.nav__right { display: flex; align-items: center; gap: 10px; }
.iconbtn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-dim); display: grid; place-items: center;
  cursor: pointer; transition: all .2s; flex: none;
}
.iconbtn:hover { color: var(--text); border-color: var(--accent-line); background: var(--surface-2); }
.iconbtn svg { width: 18px; height: 18px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  font-weight: 600; font-size: 14px; padding: 11px 18px; border-radius: 11px;
  border: 1px solid transparent; transition: all .2s var(--ease); white-space: nowrap;
  font-family: var(--font-sans);
}
.btn svg { width: 16px; height: 16px; }
.btn--primary { background: var(--accent); color: #fff; box-shadow: 0 10px 30px -10px var(--accent); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -12px var(--accent); }
.btn--ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--accent-line); background: var(--surface-2); transform: translateY(-2px); }
.btn--soft { background: var(--accent-soft); color: var(--accent); }
.btn--soft:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }

.nav__toggle { display: none; }

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 600; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent);
}
.eyebrow::before { content:""; width: 26px; height: 1.5px; background: var(--accent-line); display:inline-block; }
.sec-head { max-width: 720px; margin-bottom: 56px; }
.sec-head h2 { font-size: clamp(30px, 4.4vw, 52px); margin: 20px 0 16px; }
.sec-head p { color: var(--text-dim); font-size: clamp(16px,1.7vw,18.5px); line-height: 1.6; }
.sec-pad { padding: clamp(90px, 12vh, 150px) 0; }

/* ============================================================
   Reveal on scroll
   ============================================================ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"]{ transition-delay:.08s }
.reveal[data-d="2"]{ transition-delay:.16s }
.reveal[data-d="3"]{ transition-delay:.24s }
.reveal[data-d="4"]{ transition-delay:.32s }
@media (prefers-reduced-motion: reduce){ .reveal{opacity:1;transform:none} }

/* Non-painting / frozen-transition environments: show everything instantly */
:root.no-anim *, :root.no-anim *::before, :root.no-anim *::after { transition: none !important; }
:root.no-anim .reveal { opacity: 1 !important; transform: none !important; }
:root.no-anim .metro-line.fg { animation: none !important; stroke-dashoffset: 0 !important; }
:root.no-anim .md-fade { animation: none !important; }