/* ============================================================
   Saachin Bhatt — Personal Site
   Shared design system
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;1,400&display=swap');

:root {
  /* Brand palette */
  --blue:        #2b00d3;   /* electric blue — primary */
  --blue-bright: #4b2bff;   /* lifted blue for glows */
  --teal:        #7ec6cc;   /* accent */
  --orange:      #eb7209;   /* accent */
  --maroon:      #4f0d03;   /* deep accent */

  /* Ink / surfaces */
  --ink:        #07070e;    /* near-black with blue undertone */
  --ink-2:      #0c0c18;
  --ink-soft:   #14142a;
  --white:      #ffffff;
  --paper:      #f6f7fb;    /* light section bg */
  --paper-2:    #eceef6;
  --line:       #e4e6ef;    /* hairlines on light */
  --line-dark:  rgba(255,255,255,0.12);

  /* Text */
  --t-ink:      #0b0b14;
  --t-body:     #3c3f4d;
  --t-muted:    #6c7080;
  --t-on-dark:  #f3f4fb;
  --t-on-dark-soft: #a9adc4;

  /* Type */
  --display: 'Space Grotesk', system-ui, sans-serif;
  --body: 'IBM Plex Sans', system-ui, sans-serif;

  /* Rhythm */
  --container: 1240px;
  --gutter: clamp(20px, 5vw, 64px);
  --radius: 18px;
  --radius-lg: 28px;

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

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  margin: 0;
  font-family: var(--body);
  color: var(--t-body);
  background: var(--paper);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: clip;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1,h2,h3,h4 { font-family: var(--display); color: var(--t-ink); font-weight: 600; line-height: 1.05; margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }

.container { max-width: var(--container); margin: 0 auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(72px, 11vw, 150px); position: relative; }

/* eyebrow / kicker */
.kicker {
  font-family: var(--body);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--blue);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.kicker::before {
  content: "";
  width: 26px; height: 1.5px;
  background: currentColor;
  display: inline-block;
}
.kicker.on-dark { color: var(--teal); }

/* ---------- Buttons ---------- */
.btn {
  --bg: var(--blue);
  --fg: #fff;
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--body); font-weight: 600; font-size: 15.5px;
  padding: 15px 26px;
  border-radius: 100px;
  background: var(--bg); color: var(--fg);
  border: 1px solid transparent;
  cursor: pointer;
  position: relative;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), background .25s;
  will-change: transform;
  white-space: nowrap;
}
.btn:hover { box-shadow: 0 14px 40px -12px color-mix(in srgb, var(--blue) 70%, transparent); }
.btn .arw { transition: transform .35s var(--ease); }
.btn:hover .arw { transform: translateX(4px); }
.btn--ghost { --bg: transparent; --fg: var(--t-ink); border-color: var(--line); }
.btn--ghost:hover { box-shadow: none; border-color: var(--t-ink); }
.btn--on-dark-ghost { --bg: transparent; --fg: #fff; border-color: rgba(255,255,255,.28); }
.btn--on-dark-ghost:hover { box-shadow: none; border-color: #fff; background: rgba(255,255,255,.06); }
.btn--lg { padding: 18px 32px; font-size: 16.5px; }

/* magnetic wrapper keeps transforms isolated */
.magnetic { display: inline-block; }

/* ---------- Nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--gutter);
  transition: background .4s var(--ease), backdrop-filter .4s, padding .4s var(--ease), border-color .4s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: color-mix(in srgb, var(--white) 82%, transparent);
  backdrop-filter: blur(18px) saturate(1.4);
  border-bottom-color: var(--line);
  padding-block: 13px;
}
.nav.on-dark:not(.is-scrolled) { color: #fff; }
.nav.on-dark:not(.is-scrolled) .nav-link { color: rgba(255,255,255,.82); }
.nav.on-dark:not(.is-scrolled) .brand { color: #fff; }
.nav.on-dark:not(.is-scrolled) .brand-mark { border-color: rgba(255,255,255,.4); }

.brand { display: flex; align-items: center; gap: 12px; font-family: var(--display); font-weight: 600; font-size: 18px; color: var(--t-ink); letter-spacing: -0.02em; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 11px;
  display: grid; place-items: center;
  border: 1.5px solid var(--blue);
  color: var(--blue);
  font-weight: 700; font-size: 16px;
  background: color-mix(in srgb, var(--blue) 8%, transparent);
  transition: transform .5s var(--ease);
}
.brand:hover .brand-mark { transform: rotate(-8deg); }
.brand small { display:block; font-family: var(--body); font-weight: 500; font-size: 10px; letter-spacing: .16em; color: var(--t-muted); margin-top: 2px; text-transform: uppercase;}

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-link {
  font-size: 14.5px; font-weight: 500; color: var(--t-body);
  padding: 9px 15px; border-radius: 100px;
  transition: color .2s, background .2s;
  position: relative;
}
.nav-link:hover { color: var(--t-ink); }
.nav-link.active { color: var(--blue); }
.nav.on-dark:not(.is-scrolled) .nav-link.active { color: var(--teal); }
.nav-cta { margin-left: 10px; }
.nav-burger { display:none; }

@media (max-width: 860px) {
  .nav-links { position: fixed; inset: 0; flex-direction: column; justify-content: center; gap: 8px;
    background: var(--ink); color:#fff; transform: translateX(100%); transition: transform .5s var(--ease); }
  .nav-links.open { transform: none; }
  .nav-links .nav-link { color: rgba(255,255,255,.85); font-size: 22px; font-family: var(--display); }
  .nav-burger { display: grid; gap: 5px; background:none; border:0; cursor:pointer; z-index: 101; padding: 6px; }
  .nav-burger span { width: 26px; height: 2px; background: currentColor; transition: .35s var(--ease); display:block; }
  .nav.on-dark:not(.is-scrolled) .nav-burger { color:#fff; }
  .nav-burger.open span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
  .nav-burger.open span:nth-child(2){ opacity:0; }
  .nav-burger.open span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }
}

/* ---------- Footer ---------- */
.footer { background: var(--ink); color: var(--t-on-dark); padding-block: 80px 40px; position: relative; overflow: hidden; }
.footer a { color: var(--t-on-dark-soft); transition: color .2s; }
.footer a:hover { color: #fff; }
.footer-grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; position: relative; z-index:1; }
.footer-cta { font-family: var(--display); font-size: clamp(28px, 4vw, 46px); color:#fff; line-height:1.05; letter-spacing:-.02em; }
.footer h5 { font-family: var(--body); text-transform: uppercase; letter-spacing:.18em; font-size: 11.5px; color: var(--t-on-dark-soft); margin: 0 0 18px; font-weight:600; }
.footer-links { display:flex; flex-direction:column; gap: 11px; font-size: 15px; }
.footer-bottom { margin-top: 64px; padding-top: 26px; border-top: 1px solid var(--line-dark); display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; font-size: 13px; color: var(--t-on-dark-soft); position:relative; z-index:1; }
@media (max-width: 760px){ .footer-grid{ grid-template-columns: 1fr; gap: 36px; } }

/* ---------- Reveal animations ---------- */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal-delay="1"]{ transition-delay: .08s; }
[data-reveal-delay="2"]{ transition-delay: .16s; }
[data-reveal-delay="3"]{ transition-delay: .24s; }
[data-reveal-delay="4"]{ transition-delay: .32s; }
[data-reveal-delay="5"]{ transition-delay: .40s; }
@media (prefers-reduced-motion: reduce){
  [data-reveal]{ opacity:1 !important; transform:none !important; }
  html{ scroll-behavior:auto; }
}

/* ---------- Shared section helpers ---------- */
.lead { font-size: clamp(18px, 2.2vw, 22px); line-height: 1.55; color: var(--t-body); }
.section-head { max-width: 720px; }
.section-head h2 { font-size: clamp(30px, 4.6vw, 52px); margin-top: 18px; }
.muted { color: var(--t-muted); }
.on-dark-block { background: var(--ink); color: var(--t-on-dark); }
.on-dark-block h2, .on-dark-block h3 { color:#fff; }

/* card */
.card { background:#fff; border:1px solid var(--line); border-radius: var(--radius); padding: 30px; transition: transform .5s var(--ease), box-shadow .5s var(--ease), border-color .5s; }
.card:hover { transform: translateY(-6px); box-shadow: 0 30px 60px -34px rgba(16,18,40,.5); border-color: transparent; }

.tag { display:inline-flex; align-items:center; gap:7px; font-size:12.5px; font-weight:600; letter-spacing:.04em; padding:6px 13px; border-radius:100px; background: color-mix(in srgb, var(--blue) 8%, transparent); color: var(--blue); }

/* ============================================================
   MOTION SYSTEM
   ============================================================ */

/* scroll progress */
.scroll-progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 200; pointer-events: none; }
.scroll-progress span {
  display: block; height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--teal), var(--blue-bright), var(--blue));
  transform: scaleX(0); transform-origin: left;
  transition: transform .1s linear;
}

/* word-by-word headline reveal */
[data-split] { transform: none; }
[data-split] .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .14em; margin-bottom: -.14em; }
[data-split] .w-in { display: inline-block; transform: translateY(115%); transition: transform 1s var(--ease); will-change: transform; }
[data-split] .w-in.grad {
  background: linear-gradient(105deg, var(--teal) 0%, #bcd0ff 45%, var(--blue-bright) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
[data-split].in .w-in { transform: none; }

/* image clip reveal */
.reveal-clip { clip-path: inset(0 0 101% 0); transform: scale(1.06); transition: clip-path 1.1s var(--ease), transform 1.3s var(--ease); will-change: clip-path, transform; }
[data-reveal].in .reveal-clip, [data-reveal].in.reveal-clip { clip-path: inset(0 0 0 0); transform: none; }

/* drifting aurora on dark mesh layers */
@keyframes auroraDrift {
  0%   { transform: translate3d(-2%, -1.5%, 0) scale(1.05); }
  100% { transform: translate3d(3%, 2%, 0) scale(1.14); }
}
@media (prefers-reduced-motion: no-preference) {
  .hero-mesh, .ph-mesh, .ci-mesh, .cb-mesh, .occ-mesh {
    animation: auroraDrift 24s cubic-bezier(.45,0,.55,1) infinite alternate;
  }
}

/* nav link sliding underline */
.nav-link::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 5px; height: 2px;
  background: currentColor; border-radius: 2px;
  transform: scaleX(0); transform-origin: left; opacity: .9;
  transition: transform .38s var(--ease);
}
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }
@media (max-width: 860px){ .nav-link::after { display: none; } }

@media (prefers-reduced-motion: reduce) {
  [data-split] .w-in { transform: none !important; }
  .reveal-clip { clip-path: none !important; transform: none !important; }
  .scroll-progress { display: none; }
}

/* ============================================================
   CAROUSEL
   ============================================================ */
.carousel { position: relative; }
.carousel-viewport { overflow: hidden; border-radius: var(--radius-lg); border: 1px solid var(--line); box-shadow: 0 36px 70px -44px rgba(16,18,40,.55); background: var(--ink); }
.carousel-track { position: relative; aspect-ratio: 16 / 9; }
.carousel-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .8s var(--ease), visibility .8s; }
.carousel-slide.active { opacity: 1; visibility: visible; }
.carousel-slide img { width: 100%; height: 100%; object-fit: cover; display: block; }
.carousel-cap {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  display: flex; align-items: flex-end; gap: 12px;
  padding: 26px 26px 22px; color: #fff;
  font-family: var(--body); font-size: 14.5px; font-weight: 500;
  background: linear-gradient(to top, rgba(7,7,14,.78) 0%, rgba(7,7,14,.30) 55%, transparent 100%);
}
.carousel-cap b { font-family: var(--display); font-weight: 600; }
.carousel-btn {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 3;
  width: 52px; height: 52px; border-radius: 50%;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--white) 90%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line); color: var(--t-ink);
  cursor: pointer; font-size: 19px; line-height: 1;
  transition: transform .3s var(--ease), background .25s, box-shadow .3s;
  box-shadow: 0 10px 30px -12px rgba(0,0,0,.4);
}
.carousel-btn:hover { background: #fff; transform: translateY(-50%) scale(1.08); }
.carousel-btn.prev { left: 18px; }
.carousel-btn.next { right: 18px; }
.carousel-dots { display: flex; justify-content: center; gap: 9px; margin-top: 22px; }
.carousel-dot {
  width: 9px; height: 9px; border-radius: 50%; padding: 0; border: 0; cursor: pointer;
  background: color-mix(in srgb, var(--t-muted) 45%, transparent);
  transition: background .3s, transform .3s, width .35s var(--ease);
}
.carousel-dot.active { background: var(--blue); width: 26px; border-radius: 6px; }
.carousel.on-dark .carousel-dot { background: rgba(255,255,255,.28); }
.carousel.on-dark .carousel-dot.active { background: var(--teal); }
@media (max-width: 600px){
  .carousel-btn { width: 42px; height: 42px; font-size: 16px; }
  .carousel-btn.prev { left: 10px; } .carousel-btn.next { right: 10px; }
  .carousel-cap { font-size: 13px; padding: 18px; }
}