:root {
  --ink: #07121d;
  --navy: #0b1b2b;
  --navy-2: #12283d;
  --line: rgba(255, 255, 255, 0.12);
  --text: #e9eef4;
  --muted: #9fb0c2;
  --accent: #5fd4c8;
  --warm: #f2c98b;
  --radius: 14px;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--accent);
  cursor: pointer;
  font: 600 1rem var(--sans);
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -10px rgba(95, 212, 200, 0.6); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--text); box-shadow: none; }
.btn-small { padding: 0.5rem 1.1rem; font-size: 0.9rem; }

/* ---------- nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  transition: background 0.3s, backdrop-filter 0.3s;
}
.nav.scrolled { background: rgba(7, 18, 29, 0.78); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.nav-mark img { width: 38px; height: 38px; object-fit: contain; transition: transform 0.6s; }
.nav-mark:hover img { transform: rotate(60deg); }
.nav nav { display: flex; gap: 1.6rem; align-items: center; }
.nav nav a:not(.btn) { text-decoration: none; color: var(--muted); font-size: 0.95rem; }
.nav nav a:not(.btn):hover { color: var(--text); }

/* ---------- hero ---------- */
.hero {
  position: relative; min-height: 100vh; overflow: hidden;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 7rem 1.5rem 5rem;
  background: radial-gradient(ellipse at 50% 120%, #163a55 0%, var(--navy) 45%, var(--ink) 100%);
}
.hero-glow {
  position: absolute; width: 60vmax; height: 60vmax; border-radius: 50%;
  background: radial-gradient(circle, rgba(95, 212, 200, 0.18), transparent 60%);
  top: 50%; left: 50%; transform: translate(-50%, -60%);
  animation: pulse 8s ease-in-out infinite;
}
.hero-mark {
  position: relative; width: clamp(120px, 18vw, 190px);
  animation: spin 90s linear infinite;
  filter: drop-shadow(0 0 30px rgba(95, 212, 200, 0.25));
  margin-bottom: 2.2rem;
}
.hero h1 {
  position: relative; margin: 0 0 1.2rem;
  font: 300 clamp(2.4rem, 6vw, 4.8rem)/1.08 var(--serif);
  letter-spacing: -0.02em;
}
.hero h1 em { font-style: italic; color: var(--warm); font-weight: 500; }
.lede { position: relative; max-width: 36rem; color: var(--muted); font-size: clamp(1rem, 1.6vw, 1.2rem); margin: 0 0 2.2rem; }
.hero-cta { position: relative; display: flex; gap: 0.8rem; flex-wrap: wrap; justify-content: center; }
.scroll-cue {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px; border: 2px solid var(--line); border-radius: 14px;
}
.scroll-cue span {
  position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px;
  border-radius: 2px; background: var(--text); animation: cue 1.8s infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: 0.55; transform: translate(-50%, -60%) scale(1.08); } }
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(12px); } }

/* ---------- section titles ---------- */
.section-title {
  font: 300 clamp(1.8rem, 3.6vw, 2.8rem)/1.15 var(--serif);
  text-align: center; margin: 0 auto 3rem; max-width: 22ch; letter-spacing: -0.01em;
}
.section-title.left { text-align: left; margin-left: 0; }

/* ---------- panels ---------- */
.panels-wrap { padding: 7rem clamp(1rem, 3vw, 2.5rem); background: var(--ink); }
.panels { display: flex; gap: 10px; height: min(78vh, 680px); }
.panel {
  position: relative; flex: 1; min-width: 0; overflow: hidden; border-radius: var(--radius);
  transition: flex 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
  cursor: default; isolation: isolate;
}
.panel::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(to top, rgba(4, 10, 18, 0.9) 0%, rgba(4, 10, 18, 0.35) 45%, transparent 75%);
}
.panel:hover, .panel.active { flex: 2.6; }
.scene { position: absolute; inset: 0; width: 100%; height: 100%; transition: transform 1.2s ease; }
.panel:hover .scene { transform: scale(1.06); }

.p-dust   { background: linear-gradient(#e7a35e, #c7743a 55%, #8a5a33); }
.p-noise  { background: linear-gradient(#8fc79a, #3f7a4f 50%, #1a3f26); }
.p-summit { background: linear-gradient(#a9b9cc, #6c7f96 55%, #3a4659); }
.p-storm  { background: linear-gradient(#5d7f8c, #23515f 50%, #0b2d37); }
.p-dawn   { background: linear-gradient(#3b4a6b, #7e6b8f 45%, #e9a98a 80%); }

.panel-mark {
  position: absolute; z-index: 2; width: 34%; max-width: 110px; top: 16%; left: 50%;
  transform: translateX(-50%); animation: spin 60s linear infinite; opacity: 0.95;
}
.panel-copy {
  position: absolute; z-index: 2; left: 0; right: 0; bottom: 0;
  padding: 1.6rem 1.4rem;
}
.panel-num { font: 500 0.8rem var(--sans); letter-spacing: 0.2em; color: var(--warm); }
.panel-copy h3 { font: 500 clamp(1.1rem, 1.6vw, 1.45rem)/1.25 var(--serif); margin: 0.4rem 0 0; }
.panel-copy p, .panel-copy .btn {
  max-height: 0; opacity: 0; overflow: hidden; margin: 0;
  transition: max-height 0.6s ease, opacity 0.4s ease, margin 0.4s ease;
}
.panel-copy p { color: #d3dde8; font-size: 0.95rem; max-width: 34ch; }
.panel:hover .panel-copy p, .panel.active .panel-copy p { max-height: 10rem; opacity: 1; margin-top: 0.7rem; }
.panel:hover .panel-copy .btn, .panel.active .panel-copy .btn { max-height: 4rem; opacity: 1; margin-top: 1rem; }

/* ---------- how ---------- */
.how { padding: 7rem clamp(1rem, 4vw, 3rem); background: linear-gradient(var(--ink), var(--navy)); }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.4rem; max-width: 1100px; margin: 0 auto; }
.step {
  padding: 2.2rem 1.8rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.04), transparent);
  transition: border-color 0.3s, transform 0.3s;
}
.step:hover { border-color: rgba(95, 212, 200, 0.5); transform: translateY(-4px); }
.step-icon { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; background: rgba(95, 212, 200, 0.12); margin-bottom: 1.3rem; }
.step-icon svg { width: 28px; height: 28px; fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.step h3 { font: 500 1.35rem var(--serif); margin: 0 0 0.6rem; }
.step p { color: var(--muted); margin: 0; }

/* ---------- principles ---------- */
.principles {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: clamp(2rem, 6vw, 6rem); align-items: center;
  padding: 7rem clamp(1rem, 6vw, 6rem); background: var(--navy); max-width: 100%;
}
.principles-mark { display: grid; place-items: center; }
.principles-mark img { width: min(380px, 80%); opacity: 0.9; animation: spin 120s linear infinite reverse; }
.principles dl { margin: 0; }
.principles dt { font: 500 1.25rem var(--serif); margin-top: 1.6rem; }
.principles dt::before { content: ""; display: inline-block; width: 18px; height: 2px; background: var(--accent); vertical-align: middle; margin-right: 0.7rem; }
.principles dd { margin: 0.35rem 0 0 calc(18px + 0.7rem); color: var(--muted); }

/* ---------- join ---------- */
.join {
  text-align: center; padding: 7rem 1.5rem 8rem;
  background: radial-gradient(ellipse at 50% 0%, #17405a 0%, var(--navy) 50%, var(--ink) 100%);
}
.join-mark { width: 72px; margin: 0 auto 1.6rem; }
.join h2 { font: 300 clamp(2rem, 5vw, 3.4rem)/1.1 var(--serif); margin: 0 0 0.8rem; }
.join > p { color: var(--muted); max-width: 32rem; margin: 0 auto 2.4rem; }
.join-form { max-width: 560px; margin: 0 auto; display: grid; gap: 0.8rem; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.join-form input, .join-form textarea {
  width: 100%; padding: 0.9rem 1rem; border-radius: 10px;
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.05); color: var(--text);
  font: 400 1rem var(--sans); resize: vertical;
}
.join-form input:focus, .join-form textarea:focus { outline: none; border-color: var(--accent); background: rgba(255, 255, 255, 0.08); }
.join-form ::placeholder { color: #6f8195; }
.join-form .btn { justify-self: center; margin-top: 0.4rem; min-width: 180px; }
.join-form .btn[disabled] { opacity: 0.6; cursor: wait; transform: none; }
.hp { position: absolute !important; left: -9999px; }
.form-status { min-height: 1.5em; margin: 0.2rem 0 0; color: var(--muted); }
.form-status.ok { color: var(--accent); }
.form-status.err { color: #ff9b8a; }

/* ---------- footer ---------- */
.footer { display: flex; align-items: center; justify-content: center; gap: 0.8rem; padding: 2rem 1rem; border-top: 1px solid var(--line); color: #6f8195; font-size: 0.85rem; }
.footer img { width: 22px; opacity: 0.6; }
.footer p { margin: 0; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .nav nav a:not(.btn) { display: none; }
  .panels { flex-direction: column; height: auto; }
  .panel { min-height: 140px; flex: none; transition: min-height 0.6s ease; }
  .panel:hover, .panel.active { flex: none; min-height: 340px; }
  .panel-mark { top: 10%; width: 70px; }
  .principles { grid-template-columns: 1fr; }
  .principles-mark img { width: 180px; }
  .field-row { grid-template-columns: 1fr; }
}

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