/* ============================================================
   GreenGPT — climate product studio
   Aesthetic: warm editorial / organic. Fraunces + Hanken Grotesk.
   ============================================================ */

:root {
  --paper:    #F4EEE1;
  --paper-2:  #ECE3D1;
  --forest:   #16312A;
  --forest-2: #1E4537;
  --moss:     #3C6B50;
  --leaf:     #7CB342;
  --leaf-2:   #A4C76A;
  --sun:      #E9A33B;
  --clay:     #C8643F;
  --ink:      #122019;
  --cream-dim:#D9CFB9;

  --max: 1280px;
  --pad: clamp(1.25rem, 5vw, 5rem);

  --serif: "Fraunces", Georgia, serif;
  --sans:  "Hanken Grotesk", system-ui, sans-serif;

  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--leaf); color: var(--forest); }

a { color: inherit; text-decoration: none; }
em { font-style: italic; }

/* grain overlay -------------------------------------------------- */
.grain {
  position: fixed; inset: 0; z-index: 9999; pointer-events: none;
  opacity: .04; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* buttons -------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: .55em;
  font-family: var(--sans); font-weight: 600; font-size: .98rem;
  padding: .85em 1.5em; border-radius: 100px; cursor: pointer;
  transition: transform .35s var(--ease), background .35s var(--ease), color .35s var(--ease), box-shadow .35s var(--ease);
  border: 1.5px solid transparent; white-space: nowrap;
}
.btn span { transition: transform .35s var(--ease); }
.btn:hover span { transform: translateX(4px); }

.btn--solid { background: var(--forest); color: var(--paper); }
.btn--solid:hover { background: var(--forest-2); transform: translateY(-2px); box-shadow: 0 14px 30px -12px rgba(22,49,42,.5); }

.btn--ghost { border-color: rgba(18,32,25,.3); color: var(--forest); }
.btn--ghost:hover { background: var(--forest); color: var(--paper); border-color: var(--forest); transform: translateY(-2px); }

.btn--pill { background: var(--leaf); color: var(--forest); padding: .6em 1.25em; font-size: .9rem; }
.btn--pill:hover { background: var(--leaf-2); transform: translateY(-2px); }

.btn--lg { font-size: 1.15rem; padding: 1em 1.75em; }

/* nav ------------------------------------------------------------ */
.nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem var(--pad);
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .4s var(--ease), background .4s var(--ease);
}
.nav.is-stuck { border-bottom-color: rgba(18,32,25,.1); }

.brand { display: flex; align-items: center; gap: .55rem; }
.brand__mark { color: var(--leaf); display: grid; place-items: center; transition: transform .5s var(--ease); }
.brand:hover .brand__mark { transform: rotate(-12deg) scale(1.08); }
.brand__word { font-family: var(--serif); font-weight: 600; font-size: 1.45rem; letter-spacing: -.01em; color: var(--forest); }
.brand__word em { color: var(--moss); font-style: italic; }

.nav__links { display: flex; gap: 2rem; }
.nav__links a {
  font-weight: 500; font-size: .98rem; color: var(--forest);
  position: relative; padding: .2em 0;
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--leaf); transition: width .35s var(--ease);
}
.nav__links a:hover::after { width: 100%; }

.nav__menu { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; padding: 8px; }
.nav__menu span { width: 24px; height: 2px; background: var(--forest); border-radius: 2px; transition: .3s; }

/* hero ----------------------------------------------------------- */
.hero {
  position: relative; max-width: var(--max); margin: 0 auto;
  padding: clamp(3.5rem, 9vw, 8rem) var(--pad) clamp(2rem, 5vw, 4rem);
  overflow: clip;
}
.hero__blob {
  position: absolute; border-radius: 50%; filter: blur(60px); z-index: 0;
  opacity: .55; animation: float 14s ease-in-out infinite;
}
.hero__blob--1 { width: 480px; height: 480px; top: -120px; right: -120px;
  background: radial-gradient(circle at 30% 30%, var(--leaf), transparent 70%); }
.hero__blob--2 { width: 380px; height: 380px; bottom: -80px; left: -100px;
  background: radial-gradient(circle at 60% 40%, var(--sun), transparent 70%);
  opacity: .35; animation-delay: -6s; }

.eyebrow {
  position: relative; z-index: 1;
  font-weight: 600; font-size: .82rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--moss); display: inline-flex; align-items: center; gap: .6em;
}
.eyebrow::before { content: ""; width: 2.2em; height: 1px; background: var(--moss); display: inline-block; }

.hero__title {
  position: relative; z-index: 1;
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(2.8rem, 8.5vw, 7rem); line-height: .98; letter-spacing: -.03em;
  color: var(--forest); margin: 1.2rem 0 1.6rem;
  font-variation-settings: "opsz" 144;
}
.hero__title .line { display: block; }
.hero__title em { color: var(--leaf); font-style: italic; }

.hero__lede {
  position: relative; z-index: 1;
  max-width: 34ch; font-size: clamp(1.1rem, 1.6vw, 1.35rem); color: var(--forest-2);
}
.hero__lede strong { color: var(--clay); font-weight: 600; }

.hero__cta { position: relative; z-index: 1; display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2.2rem; }

.hero__scroll {
  position: relative; z-index: 1; margin-top: 4rem;
  display: inline-flex; align-items: center; gap: .7rem;
  font-size: .78rem; letter-spacing: .18em; text-transform: uppercase; color: var(--moss);
}
.hero__scroll span {
  width: 1px; height: 38px; background: var(--moss); position: relative; overflow: hidden;
}
.hero__scroll span::after {
  content: ""; position: absolute; inset: 0; background: var(--paper);
  animation: scrolldot 2.2s var(--ease) infinite;
}

@keyframes scrolldot { 0%{transform:translateY(-100%)} 60%,100%{transform:translateY(100%)} }
@keyframes float { 0%,100%{transform:translate(0,0)} 50%{transform:translate(20px,-30px)} }

/* marquee -------------------------------------------------------- */
.marquee {
  border-top: 1px solid rgba(18,32,25,.12); border-bottom: 1px solid rgba(18,32,25,.12);
  overflow: hidden; background: var(--paper-2); padding: .9rem 0;
}
.marquee__track { display: flex; gap: 2.5rem; width: max-content; animation: slide 32s linear infinite; }
.marquee__track span {
  font-family: var(--serif); font-size: 1.4rem; font-style: italic; color: var(--forest); white-space: nowrap;
}
.marquee__track .dot { color: var(--leaf); font-style: normal; }
@keyframes slide { to { transform: translateX(-50%); } }

/* studio --------------------------------------------------------- */
.section-tag {
  font-weight: 600; font-size: .8rem; letter-spacing: .2em; text-transform: uppercase; color: var(--moss);
  margin-bottom: 1.5rem;
}
.section-tag--light { color: var(--leaf-2); }

.studio { max-width: var(--max); margin: 0 auto; padding: clamp(4rem, 10vw, 9rem) var(--pad); }
.studio__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); }
.studio__sticky { position: sticky; top: 120px; align-self: start; }
.studio__head {
  font-family: var(--serif); font-weight: 500; font-size: clamp(1.9rem, 3.6vw, 3.1rem);
  line-height: 1.08; letter-spacing: -.02em; color: var(--forest);
}
.studio__head em { color: var(--leaf); }
.studio__body p { font-size: clamp(1.05rem, 1.5vw, 1.25rem); color: var(--forest-2); margin-bottom: 1.4rem; max-width: 46ch; }
.studio__list { list-style: none; margin-top: 2.5rem; display: grid; gap: 1rem; }
.studio__list li { display: flex; gap: .8rem; font-size: 1.1rem; color: var(--forest); font-weight: 500; align-items: baseline; }
.studio__list span { color: var(--leaf); font-weight: 700; }

/* services ------------------------------------------------------- */
.services { max-width: var(--max); margin: 0 auto; padding: clamp(2rem, 4vw, 4rem) var(--pad) clamp(4rem, 9vw, 8rem); }
.services__intro h2 {
  font-family: var(--serif); font-weight: 500; font-size: clamp(2.2rem, 5vw, 4rem);
  letter-spacing: -.025em; color: var(--forest); line-height: 1;
}
.services__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; margin-top: 3rem; }
.card {
  background: var(--paper-2); border: 1px solid rgba(18,32,25,.08); border-radius: 22px;
  padding: clamp(1.5rem, 3vw, 2.5rem); position: relative; overflow: hidden;
  transition: transform .45s var(--ease), box-shadow .45s var(--ease), background .45s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: 22px; opacity: 0;
  background: radial-gradient(120% 120% at 100% 0%, color-mix(in srgb, var(--leaf) 24%, transparent), transparent 55%);
  transition: opacity .45s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: 0 26px 50px -28px rgba(22,49,42,.45); }
.card:hover::before { opacity: 1; }
.card__num { font-family: var(--serif); font-size: .9rem; color: var(--moss); font-weight: 600; }
.card h3 {
  font-family: var(--serif); font-weight: 500; font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  color: var(--forest); margin: .6rem 0 .8rem; letter-spacing: -.01em; position: relative;
}
.card p { color: var(--forest-2); font-size: 1.02rem; position: relative; }
.card__tag {
  display: inline-block; margin-top: 1.5rem; font-size: .8rem; font-weight: 600;
  letter-spacing: .04em; color: var(--moss); position: relative;
}
.card--accent { background: var(--forest); border-color: var(--forest); }
.card--accent .card__num, .card--accent .card__tag { color: var(--leaf-2); }
.card--accent h3 { color: var(--paper); }
.card--accent p { color: var(--cream-dim); }

/* impact --------------------------------------------------------- */
.impact {
  position: relative; background: var(--forest); color: var(--paper);
  padding: clamp(4.5rem, 11vw, 9rem) var(--pad); overflow: clip;
}
.impact__blob {
  position: absolute; width: 520px; height: 520px; border-radius: 50%; filter: blur(80px);
  top: -150px; left: -120px; opacity: .25;
  background: radial-gradient(circle, var(--leaf), transparent 70%);
}
.impact > * { position: relative; z-index: 1; max-width: var(--max); margin-left: auto; margin-right: auto; }
.impact__head {
  font-family: var(--serif); font-weight: 500; font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1.03; letter-spacing: -.025em; max-width: 18ch;
}
.impact__head em { color: var(--leaf); }
.impact__stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin: 4rem auto; }
.stat { border-top: 1px solid rgba(244,238,225,.2); padding-top: 1.4rem; }
.stat__num {
  display: block; font-family: var(--serif); font-weight: 500;
  font-size: clamp(3rem, 7vw, 5.5rem); line-height: 1; color: var(--leaf-2); letter-spacing: -.03em;
  font-variation-settings: "opsz" 144;
}
.stat__label { display: block; margin-top: .9rem; color: var(--cream-dim); font-size: 1.02rem; max-width: 26ch; }
.impact__note { max-width: 52ch; color: var(--cream-dim); font-size: 1.1rem; }

/* mission -------------------------------------------------------- */
.mission { max-width: var(--max); margin: 0 auto; padding: clamp(4.5rem, 11vw, 9rem) var(--pad); }
.mission__grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.mission__left { position: sticky; top: 120px; }
.mission__left h2 {
  font-family: var(--serif); font-weight: 500; font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05; letter-spacing: -.025em; color: var(--forest);
}
.mission__left h2 em { color: var(--leaf); }
.mission__copy { margin-top: 1.5rem; font-size: 1.15rem; color: var(--forest-2); max-width: 38ch; }

.steps { list-style: none; display: grid; gap: 0; }
.step {
  display: flex; gap: 1.5rem; padding: 1.8rem 0; align-items: baseline;
  border-bottom: 1px solid rgba(18,32,25,.14);
}
.step:first-child { border-top: 1px solid rgba(18,32,25,.14); }
.step__n { font-family: var(--serif); font-style: italic; font-size: 1.3rem; color: var(--leaf); min-width: 2.5ch; }
.step h3 { font-family: var(--serif); font-weight: 500; font-size: clamp(1.4rem, 2.4vw, 1.9rem); color: var(--forest); margin-bottom: .35rem; }
.step p { color: var(--forest-2); font-size: 1.05rem; max-width: 44ch; }

/* cta ------------------------------------------------------------ */
.cta { padding: clamp(2rem, 5vw, 4rem) var(--pad) clamp(4rem, 9vw, 7rem); }
.cta__inner {
  max-width: 980px; margin: 0 auto; text-align: center; position: relative;
  background: var(--paper-2); border: 1px solid rgba(18,32,25,.1); border-radius: 36px;
  padding: clamp(3rem, 7vw, 6rem) clamp(1.5rem, 5vw, 4rem); overflow: hidden;
}
.cta__leaf { color: var(--leaf); margin: 0 auto 1.5rem; width: 84px; animation: float 9s ease-in-out infinite; }
.cta__leaf svg { width: 84px; height: auto; }
.cta__head {
  font-family: var(--serif); font-weight: 500; font-size: clamp(2.1rem, 5.5vw, 4.2rem);
  line-height: 1.02; letter-spacing: -.03em; color: var(--forest);
}
.cta__lede { max-width: 46ch; margin: 1.4rem auto 2.4rem; font-size: 1.15rem; color: var(--forest-2); }

/* footer --------------------------------------------------------- */
.footer { background: var(--forest); color: var(--cream-dim); padding: clamp(3rem, 6vw, 5rem) var(--pad) 2.5rem; }
.footer__top {
  max-width: var(--max); margin: 0 auto; display: flex; justify-content: space-between;
  align-items: center; gap: 2rem; flex-wrap: wrap; padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(244,238,225,.16);
}
.brand--footer .brand__word { color: var(--paper); }
.brand--footer .brand__word em { color: var(--leaf-2); }
.brand--footer .brand__mark { color: var(--leaf); }
.footer__nav { display: flex; gap: 1.8rem; flex-wrap: wrap; }
.footer__nav a { font-weight: 500; color: var(--cream-dim); transition: color .3s; }
.footer__nav a:hover { color: var(--leaf-2); }
.footer__bottom {
  max-width: var(--max); margin: 2rem auto 0; display: flex; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap; font-size: .9rem; color: rgba(217,207,185,.7);
}

/* reveal animations --------------------------------------------- */
.reveal { opacity: 0; transform: translateY(28px); 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:.34s}
.reveal[data-d="5"]{transition-delay:.44s}.reveal[data-d="6"]{transition-delay:.6s}

/* responsive ----------------------------------------------------- */
@media (max-width: 880px) {
  .nav__links, .nav__cta { display: none; }
  .nav__menu { display: flex; }
  .nav__links.open {
    display: flex; flex-direction: column; gap: 1.4rem; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper); padding: 2rem var(--pad); border-bottom: 1px solid rgba(18,32,25,.1);
  }
  .studio__grid, .mission__grid { grid-template-columns: 1fr; }
  .studio__sticky, .mission__left { position: static; }
  .services__grid, .impact__stats { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}