/* ==========================================================================
   RANGARAJ.SITE — BRUTALIST DESIGN SYSTEM
   base.css — tokens, reset, typography, theme, pull-cord
   ========================================================================== */

/* ---------- TOKENS: LIGHT (default) ---------- */
:root {
  --ink:        #000000;
  --paper:      #F5F5F5;
  --paper-2:    #EAEAE4;
  --paper-3:    #FFFFFF;
  --yellow:     #FFFF00;
  --red:        #FF0000;
  --ink-soft:   #2A2A2A;
  --ink-faint:  #6B6B6B;
  --rule:       #000000;

  --on-yellow:  #000000;
  --on-red:     #FFFFFF;

  --bw:         3px;                    /* border weight */
  --bw-thick:   5px;
  --shadow:     8px 8px 0 var(--ink);
  --shadow-sm:  4px 4px 0 var(--ink);
  --shadow-lg:  14px 14px 0 var(--ink);

  --grid-line:  rgba(0, 0, 0, .07);
  --noise-op:   .035;

  --mono:  "IBM Plex Mono", "Courier New", ui-monospace, monospace;
  --disp:  "Archivo Black", "IBM Plex Mono", sans-serif;

  --gut:   clamp(1.1rem, 3.5vw, 2.75rem);
  --maxw:  1680px;

  --ease:  cubic-bezier(.2, .9, .25, 1);
  --cord:  cubic-bezier(.16, 1.2, .3, 1);
}

/* ---------- TOKENS: DARK ---------- */
[data-theme="dark"] {
  --ink:        #F2F2EC;
  --paper:      #0A0E27;
  --paper-2:    #12183A;
  --paper-3:    #060917;
  --yellow:     #FFFF00;
  --red:        #FF2A2A;
  --ink-soft:   #C9C9C2;
  --ink-faint:  #7C86B4;
  --rule:       #F2F2EC;

  --on-yellow:  #000000;
  --on-red:     #FFFFFF;

  --shadow:     8px 8px 0 var(--yellow);
  --shadow-sm:  4px 4px 0 var(--yellow);
  --shadow-lg:  14px 14px 0 var(--yellow);

  --grid-line:  rgba(242, 242, 236, .075);
  --noise-op:   .05;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: clamp(.95rem, .35vw + .85rem, 1.075rem);
  line-height: 1.62;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background .5s var(--ease), color .5s var(--ease);
  position: relative;
}

/* Grid + grain atmosphere */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right,  var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 42px 42px;
}

body::after {
  content: "";
  position: fixed;
  inset: -50%;
  z-index: 0;
  pointer-events: none;
  opacity: var(--noise-op);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
}

main, header, footer { position: relative; z-index: 1; }

img, video, svg { display: block; max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

::selection { background: var(--yellow); color: #000; }

:focus-visible {
  outline: var(--bw) solid var(--red);
  outline-offset: 3px;
}

/* ---------- TYPOGRAPHY ---------- */
h1, h2, h3, h4 {
  font-family: var(--disp);
  font-weight: 900;
  line-height: .86;
  letter-spacing: -.03em;
  text-transform: uppercase;
  text-wrap: balance;
}

.h-mega {
  font-size: clamp(3.4rem, 15vw, 12rem);
  line-height: .78;
  letter-spacing: -.05em;
}
h1 { font-size: clamp(2.6rem, 8vw, 6rem); }
h2 { font-size: clamp(2rem, 5.5vw, 4rem); }
h3 { font-size: clamp(1.25rem, 2.2vw, 1.75rem); letter-spacing: -.02em; }

p { text-wrap: pretty; max-width: 68ch; }

.mono-label {
  font-family: var(--mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.4rem);
  line-height: 1.5;
  max-width: 60ch;
}

/* ---------- LAYOUT ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.section {
  padding-block: clamp(4rem, 9vw, 8.5rem);
  border-bottom: var(--bw) solid var(--rule);
}

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
  padding-bottom: 1.1rem;
  border-bottom: var(--bw) solid var(--rule);
}
.sec-head .num {
  font-family: var(--disp);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  background: var(--yellow);
  color: var(--on-yellow);
  padding: .1em .45em;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-sm);
}

/* ---------- SKIP LINK ---------- */
.skip {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 999;
  background: var(--yellow);
  color: #000;
  border: var(--bw) solid #000;
  padding: .7rem 1.2rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-size: .75rem;
  transition: top .25s var(--ease);
}
.skip:focus { top: 1rem; }

/* ==========================================================================
   PULL-CORD THEME TOGGLE — window-blind string
   ========================================================================== */
.cord {
  position: fixed;
  top: 64px;                 /* hangs from under the nav bar, never over it */
  right: clamp(1rem, 4vw, 3.5rem);
  z-index: 150;              /* below nav (200) so it can't block links */
  width: 58px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: none;
  padding: 0;
  /* string hangs from the very top edge */
  filter: drop-shadow(2px 3px 0 rgba(0, 0, 0, .28));
}

.cord__rail {
  width: 58px;
  height: 14px;
  background: var(--ink);
  border: 0;
  border-radius: 0 0 3px 3px;
}

.cord__string {
  width: var(--bw);
  height: var(--cord-len, 78px);
  background: var(--ink);
  transform-origin: top center;
  transition: height .45s var(--cord);
}

/* the knob you grab */
.cord__knob {
  width: 34px;
  height: 34px;
  background: var(--yellow);
  border: var(--bw) solid var(--ink);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--disp);
  font-size: .62rem;
  color: #000;
  letter-spacing: -.02em;
  transition: transform .3s var(--ease), background .3s var(--ease);
}
[data-theme="dark"] .cord__knob { background: var(--red); color: var(--on-red); }

/* whole cord swings + stretches on interaction */
.cord__swing {
  display: flex;
  flex-direction: column;
  align-items: center;
  transform-origin: top center;
  animation: cord-idle 6.5s var(--ease) infinite;
}
.cord:hover  .cord__string { height: calc(var(--cord-len, 104px) + 16px); }
.cord:hover  .cord__knob   { transform: scale(1.1); }
.cord:active .cord__string { height: calc(var(--cord-len, 104px) + 40px); }

.cord.is-pulled .cord__swing { animation: cord-yank .85s var(--cord); }

@keyframes cord-idle {
  0%, 92%, 100% { transform: rotate(0deg); }
  95%           { transform: rotate(1.6deg); }
  97.5%         { transform: rotate(-1.1deg); }
}
@keyframes cord-yank {
  0%   { transform: translateY(0)    rotate(0deg); }
  22%  { transform: translateY(22px) rotate(0deg); }
  45%  { transform: translateY(0)    rotate(-7deg); }
  62%  { transform: translateY(0)    rotate(5deg); }
  78%  { transform: translateY(0)    rotate(-3deg); }
  90%  { transform: translateY(0)    rotate(1.5deg); }
  100% { transform: translateY(0)    rotate(0deg); }
}

/* on small screens the burger owns the top-right, so move the cord inboard */
@media (max-width: 900px) {
  .cord { right: auto; left: clamp(1rem, 6vw, 3rem); }
  .cord__hint { right: auto; left: 100%; margin: 0 0 0 .8rem; }
  .cord:hover .cord__hint { transform: translateX(0); }
}

.cord__hint {
  position: absolute;
  top: 46px;
  right: 100%;
  margin-right: .8rem;
  white-space: nowrap;
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  opacity: 0;
  transform: translateX(8px);
  transition: opacity .3s, transform .3s;
  pointer-events: none;
}
.cord:hover .cord__hint { opacity: 1; transform: translateX(0); }

/* theme sweep on switch */
.theme-sweep {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--yellow);
  pointer-events: none;
  transform: scaleY(0);
  transform-origin: top;
}
.theme-sweep.run { animation: sweep .62s var(--ease); }
@keyframes sweep {
  0%   { transform: scaleY(0);   transform-origin: top; }
  45%  { transform: scaleY(1);   transform-origin: top; }
  55%  { transform: scaleY(1);   transform-origin: bottom; }
  100% { transform: scaleY(0);   transform-origin: bottom; }
}

/* ==========================================================================
   NAV
   ========================================================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--paper);
  border-bottom: var(--bw) solid var(--rule);
}
.nav__in {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gut);
  min-height: 64px;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--disp);
  font-size: 1.05rem;
  letter-spacing: -.02em;
  text-transform: uppercase;
}
.nav__logo b {
  background: var(--ink);
  color: var(--paper);
  padding: .18em .42em;
}
.nav__links { display: flex; align-items: stretch; }
.nav__links a {
  display: flex;
  align-items: center;
  padding-inline: clamp(.7rem, 1.6vw, 1.3rem);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  border-left: var(--bw) solid var(--rule);
  transition: background .18s, color .18s;
}
.nav__links a:last-child { border-right: var(--bw) solid var(--rule); }
.nav__links a:hover { background: var(--yellow); color: var(--on-yellow); }
.nav__links a[aria-current="page"] { background: var(--ink); color: var(--paper); }

.nav__burger {
  display: none;
  align-items: center;
  gap: .5rem;
  border-left: var(--bw) solid var(--rule);
  border-right: var(--bw) solid var(--rule);
  padding-inline: 1rem;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .nav__burger { display: flex; }
  .nav__links {
    position: fixed;
    inset: 64px 0 auto 0;
    flex-direction: column;
    background: var(--paper);
    border-bottom: var(--bw) solid var(--rule);
    transform: translateY(-130%);
    transition: transform .4s var(--ease);
  }
  .nav__links.open { transform: translateY(0); }
  .nav__links a {
    border-left: 0;
    border-top: var(--bw) solid var(--rule);
    padding: 1.05rem var(--gut);
  }
  .nav__links a:last-child { border-right: 0; }
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  padding: .9rem 1.6rem;
  border: var(--bw) solid var(--ink);
  background: var(--paper-3);
  color: var(--ink);
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  box-shadow: var(--shadow-sm);
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), background .16s;
}
.btn:hover  { transform: translate(-3px, -3px); box-shadow: var(--shadow); background: var(--yellow); color: var(--on-yellow); }
.btn:active { transform: translate(2px, 2px);   box-shadow: 2px 2px 0 var(--ink); }
.btn--fill  { background: var(--ink); color: var(--paper); }
.btn--fill:hover { background: var(--yellow); color: var(--on-yellow); }
.btn--red   { background: var(--red); color: var(--on-red); }
.btn--red:hover { background: var(--yellow); color: var(--on-yellow); }

/* ==========================================================================
   SCROLL REVEAL
   ========================================================================== */
.rv {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .75s var(--ease), transform .75s var(--ease);
  transition-delay: var(--d, 0ms);
}
.rv.in { opacity: 1; transform: none; }

.rv-clip {
  clip-path: inset(0 100% 0 0);
  transition: clip-path 1s var(--ease);
  transition-delay: var(--d, 0ms);
}
.rv-clip.in { clip-path: inset(0 0 0 0); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; animation-iteration-count: 1 !important;
      transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .rv { opacity: 1; transform: none; }
  .rv-clip { clip-path: none; }
}

/* ==========================================================================
   MARQUEE
   ========================================================================== */
.marquee {
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  border-block: var(--bw) solid var(--rule);
  padding-block: .8rem;
  display: flex;
}
.marquee__t {
  display: flex;
  gap: 2.5rem;
  padding-right: 2.5rem;
  flex-shrink: 0;
  animation: slide 26s linear infinite;
  font-family: var(--disp);
  font-size: clamp(1rem, 2vw, 1.5rem);
  text-transform: uppercase;
  letter-spacing: -.01em;
  white-space: nowrap;
}
.marquee:hover .marquee__t { animation-play-state: paused; }
.marquee__t i { color: var(--yellow); font-style: normal; }
@keyframes slide { to { transform: translateX(-100%); } }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.foot { border-top: var(--bw-thick) solid var(--rule); background: var(--paper-2); }
.foot__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 0;
}
.foot__col {
  padding: clamp(1.8rem, 3.5vw, 3rem) var(--gut);
  border-right: var(--bw) solid var(--rule);
}
.foot__col:last-child { border-right: 0; }
.foot__col h4 { font-size: .8rem; letter-spacing: .16em; margin-bottom: 1.1rem; }
.foot__col a { display: block; padding: .32rem 0; font-size: .84rem; border-bottom: 1px solid transparent; }
.foot__col a:hover { color: var(--red); border-bottom-color: var(--red); }
.foot__bar {
  border-top: var(--bw) solid var(--rule);
  padding: 1.1rem var(--gut);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
@media (max-width: 780px) {
  .foot__grid { grid-template-columns: 1fr; }
  .foot__col { border-right: 0; border-bottom: var(--bw) solid var(--rule); }
    }