:root {
  --ink: #12202b;
  --ink-soft: #3a4f5c;
  --mist: #eef3f6;
  --mist-deep: #d5e0e8;
  --paper: #f7fafb;
  --teal: #1a8f8a;
  --teal-deep: #0f5f5c;
  --amber: #d9920b;
  --aluminum: #8fa3b0;
  --line: rgba(18, 32, 43, 0.12);
  --font-display: "Syne", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --radius: 4px;
  --space: clamp(1.25rem, 3vw, 2.5rem);
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.55;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(26, 143, 138, 0.12), transparent 55%),
    radial-gradient(900px 500px at -10% 20%, rgba(217, 146, 11, 0.08), transparent 50%),
    linear-gradient(180deg, #f3f7f9 0%, var(--paper) 40%, #e8eef2 100%);
  min-height: 100vh;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--teal-deep);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2.75rem, 8vw, 5.5rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
}

h3 {
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
}

p {
  margin: 0 0 1rem;
}

.section-lede {
  max-width: 38rem;
  color: var(--ink-soft);
  font-size: 1.125rem;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(247, 250, 251, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(247, 250, 251, 0.92);
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav {
  display: none;
  gap: 1.5rem;
}

.nav a {
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.nav a:hover {
  color: var(--ink);
}

@media (min-width: 800px) {
  .nav {
    display: flex;
  }
}

/* Buttons — rectangular, not pills */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 560;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--teal-deep);
  color: var(--paper);
}

.btn-secondary {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}

.btn-secondary:hover {
  background: rgba(18, 32, 43, 0.05);
  color: var(--ink);
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
  padding: 0.5rem 0.85rem;
}

.btn-ghost:hover {
  border-color: var(--teal);
  color: var(--teal-deep);
}

/* Hero — full-bleed photo; brand/headline live in hero.jpg */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-atmosphere {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: #c5d5df;
}

.hero-atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    transparent 58%,
    rgba(18, 32, 43, 0.28) 100%
  );
  pointer-events: none;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  transform: scale(1.04);
  animation: heroDrift 22s ease-in-out infinite alternate;
}

@keyframes heroDrift {
  from {
    transform: scale(1.04) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.08) translate3d(-1.2%, -0.6%, 0);
  }
}

.hero-copy {
  position: relative;
  z-index: 1;
  padding: clamp(5.5rem, 12vh, 7rem) clamp(1.25rem, 5vw, 3.5rem) clamp(2.5rem, 8vh, 4.5rem);
  max-width: 40rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero .btn-secondary {
  border-color: rgba(247, 250, 251, 0.85);
  color: var(--paper);
  background: rgba(18, 32, 43, 0.25);
  backdrop-filter: blur(6px);
}

.hero .btn-secondary:hover {
  background: rgba(18, 32, 43, 0.45);
  color: var(--paper);
  border-color: var(--paper);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  animation: revealUp 0.85s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.reveal.delay-1 {
  animation-delay: 0.12s;
}

.reveal.delay-2 {
  animation-delay: 0.24s;
}

.reveal.delay-3 {
  animation-delay: 0.36s;
}

@keyframes revealUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Sections */
.section {
  padding: clamp(3.5rem, 10vw, 6.5rem) clamp(1.25rem, 5vw, 3.5rem);
}

.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.problem {
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.marketplace .sides {
  display: grid;
  gap: 2rem;
  margin-top: 2.5rem;
}

@media (min-width: 780px) {
  .marketplace .sides {
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
  }
}

.side {
  padding-top: 1rem;
  border-top: 2px solid var(--teal);
}

.side p {
  color: var(--ink-soft);
  margin: 0;
}

/* How it works */
.how {
  background:
    linear-gradient(180deg, rgba(26, 143, 138, 0.06), transparent 40%),
    rgba(255, 255, 255, 0.35);
  border-block: 1px solid var(--line);
}

.flow {
  list-style: none;
  margin: 2.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.flow li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.flow li:last-child {
  border-bottom: 0;
}

.flow-step {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--teal);
  min-width: 2rem;
  padding-top: 0.15rem;
}

.flow h3 {
  margin-bottom: 0.25rem;
}

.flow p {
  margin: 0;
  color: var(--ink-soft);
}

.skill-swap {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
  max-width: 40rem;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-chip {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--aluminum);
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: color 0.35s ease, border-color 0.35s ease, background 0.35s ease;
}

.skill-chip:hover {
  color: var(--ink);
  border-color: var(--teal);
}

.skill-chip.is-active {
  color: var(--ink);
  border-color: var(--teal);
  background: rgba(26, 143, 138, 0.12);
}

.skill-stage {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--mist-deep);
  border: 1px solid var(--line);
}

.skill-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0;
  transition: opacity 1.6s ease;
}

.skill-image.is-active {
  opacity: 1;
}

/* Skills evolve */
.skills-layout {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 860px) {
  .skills-layout {
    grid-template-columns: 1fr 1.1fr;
    align-items: center;
  }
}

.evolve-track {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.evolve-node {
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
  font-size: 0.9rem;
  font-weight: 500;
}

.evolve-node-final {
  border-color: var(--teal);
  background: rgba(26, 143, 138, 0.1);
  font-family: var(--font-display);
  font-weight: 700;
}

.evolve-arrow {
  width: 1.5rem;
  height: 1px;
  background: var(--aluminum);
  position: relative;
}

.evolve-arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  border-right: 1px solid var(--aluminum);
  border-top: 1px solid var(--aluminum);
  transform: translateY(-50%) rotate(45deg);
}

/* Contact */
.contact {
  background: linear-gradient(135deg, #12202b 0%, #1a3a42 55%, #0f5f5c 100%);
  color: var(--mist);
}

.contact .section-lede {
  color: rgba(238, 243, 246, 0.78);
}

.contact .btn-primary {
  background: var(--amber);
  color: var(--ink);
}

.contact .btn-primary:hover {
  background: #e8a820;
  color: var(--ink);
}

.contact-inner {
  max-width: 36rem;
}

/* Footer */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1.5rem clamp(1.25rem, 5vw, 3.5rem);
  font-size: 0.9rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.site-footer p {
  margin: 0;
}

.footer-tag {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
}

@media (max-width: 640px) {
  .site-header .btn-ghost {
    display: none;
  }

  .hero-copy {
    max-width: 100%;
  }

  .hero-image {
    object-position: 35% 35%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-image {
    animation: none;
    transform: none;
  }

  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
  }
}