/* 03 — Shan Shui · Mit Ruhe zur Kraft
   Ink on paper. Cool summit → warm ground. */

:root {
  --ink: #26282a;
  --ink-70: rgba(38, 40, 42, 0.72);
  --ink-50: rgba(38, 40, 42, 0.52);
  --ink-12: rgba(38, 40, 42, 0.12);
  --paper: #edeae3;
  --paper-warm: #f3ecdf;
  --mist: #f6f4ef;
  --warm: #a4552f;
  --warm-deep: #8f4726;
  --seal: #9e2b25;
  --font-display: "Cormorant Garamond", Georgia, serif;
  --font-body: "Inter", -apple-system, system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { scroll-behavior: smooth; overflow-x: clip; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(164, 85, 47, 0.22); }

/* ---------- painted world ---------- */

#world {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
}

.grain {
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  z-index: 3;
  pointer-events: none;
  opacity: 0.4;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='260' height='260'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 0.14 0 0 0 0 0.13 0 0 0 0 0.11 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='260' height='260' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- loader ---------- */

.loader {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  transition: opacity 1.1s var(--ease-out), visibility 1.1s;
}
.loader.is-done { opacity: 0; visibility: hidden; }

.loader-enso { transform: rotate(-95deg); }
.loader-enso circle {
  fill: none;
  stroke: var(--ink);
  stroke-linecap: round;
}
.enso-stroke {
  stroke-width: 3.4;
  stroke-dasharray: 91 100;
  stroke-dashoffset: 91;
  opacity: 0.88;
  animation: enso-draw 1.7s cubic-bezier(0.6, 0.02, 0.25, 1) 0.25s forwards;
}
.enso-echo {
  stroke-width: 6.5;
  stroke-dasharray: 88 100;
  stroke-dashoffset: 88;
  opacity: 0.14;
  animation: enso-draw 1.7s cubic-bezier(0.6, 0.02, 0.25, 1) 0.32s forwards;
}
@keyframes enso-draw { to { stroke-dashoffset: 0; } }

.loader-brand {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--ink-70);
  opacity: 0;
  animation: fade-in 1.2s var(--ease-out) 1.1s forwards;
}
@keyframes fade-in { to { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  .loader { transition-duration: 0.4s; }
  .enso-stroke, .enso-echo { animation: none; stroke-dashoffset: 0; }
  .loader-brand { animation: none; opacity: 1; }
}

/* ---------- HUD + rail ---------- */

.hud {
  position: fixed;
  left: clamp(1.2rem, 3vw, 2.6rem);
  bottom: clamp(1.2rem, 3vw, 2.4rem);
  z-index: 10;
  font-family: var(--font-mono);
  color: var(--ink-70);
  opacity: 0;
  transition: opacity 1.4s var(--ease-out);
  pointer-events: none;
}
.hud.is-on { opacity: 1; }
.hud-alt {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  font-variant-numeric: tabular-nums;
}
.hud-alt #hud-alt-num { font-variant-numeric: tabular-nums; }
.hud-label {
  margin-top: 0.45rem;
  font-size: 0.6563rem;
  letter-spacing: 0.22em;
  color: var(--ink-50);
}

.rail {
  position: fixed;
  right: clamp(1.1rem, 2.6vw, 2.2rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.35rem;
  opacity: 0;
  transition: opacity 1.4s var(--ease-out);
  pointer-events: none;
}
.rail.is-on { opacity: 1; }
.rail-line {
  position: absolute;
  top: -1.6rem;
  bottom: -1.6rem;
  width: 1px;
  background: var(--ink-12);
}
.rail-dot {
  position: relative;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink);
  opacity: 0.22;
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.rail-dot.is-active { opacity: 0.85; transform: scale(1.5); }

/* ---------- nav ---------- */

.nav::before {
  content: "";
  position: absolute;
  inset: 0 0 -46px 0;
  background: linear-gradient(rgba(238, 235, 227, 0.92), rgba(238, 235, 227, 0.55) 55%, rgba(238, 235, 227, 0));
  pointer-events: none;
  z-index: -1;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.3rem clamp(1.2rem, 3vw, 2.6rem);
}
.nav-brand {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.nav-brand em, .footer-brand em { font-style: italic; font-weight: 400; }
.nav-links {
  display: flex;
  gap: clamp(1.2rem, 3vw, 2.4rem);
  margin-left: auto;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-70);
  text-decoration: none;
  padding: 0.6rem 0;
  transition: color 0.4s;
}
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid rgba(38, 40, 42, 0.4);
  border-radius: 99px;
  padding: 0.72rem 1.3rem;
  transition: background 0.4s, color 0.4s, border-color 0.4s;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- stations ---------- */

main { position: relative; z-index: 5; }

.station {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 38vh clamp(1.4rem, 5vw, 4rem);
}
.station-hero { padding-top: 20vh; padding-bottom: 30vh; min-height: 100svh; }

.clearing {
  position: relative;
  max-width: 34rem;
  width: 100%;
}
.clearing::before {
  content: "";
  position: absolute;
  inset: -22% -34%;
  background: radial-gradient(ellipse farthest-side at center, rgba(242, 240, 233, 0.85) 0%, rgba(242, 240, 233, 0.5) 52%, rgba(242, 240, 233, 0) 88%);
  z-index: -1;
  pointer-events: none;
}
.clearing-wide { max-width: 62rem; }
.clearing-wide::before { inset: -18% -12%; }
.clearing-hero { max-width: 46rem; text-align: center; }
.clearing-teacher { max-width: 38rem; }
.clearing-teacher::before {
  inset: -14% -22% -26%;
  background: radial-gradient(ellipse farthest-side at center, rgba(243, 240, 232, 0.92) 0%, rgba(243, 240, 232, 0.6) 55%, rgba(243, 240, 232, 0) 90%);
}
.clearing-closing { max-width: 38rem; text-align: center; }
.clearing-closing::before {
  inset: -18% -30%;
  background: radial-gradient(ellipse farthest-side at center, rgba(245, 240, 229, 0.9) 0%, rgba(245, 240, 229, 0.55) 55%, rgba(245, 240, 229, 0) 90%);
}

/* type */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-50);
  margin-bottom: 1.6rem;
}

h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.9rem, 8.2vw, 5.9rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin-bottom: 1.8rem;
}
h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.1rem, 4.6vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
  max-width: 22ch;
}
.clearing-hero h1 { margin-left: auto; margin-right: auto; }
.clearing-wide h2, .clearing-hero h2 { margin-left: 0; }
.clearing-closing h2 { margin-left: auto; margin-right: auto; }
h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.45rem;
  line-height: 1.25;
  margin-bottom: 0.6rem;
}

.clearing p + p { margin-top: 1.1rem; }

.lead {
  font-size: 1.17rem;
  line-height: 1.75;
  color: var(--ink-70);
  max-width: 38rem;
  margin: 0 auto 1.5rem;
}
.meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ink-50);
  margin-bottom: 2.6rem;
}
.section-intro { color: var(--ink-70); max-width: 34rem; margin-bottom: 2.4rem; }

/* buttons + links */

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  justify-content: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0.8rem 1.9rem;
  border-radius: 99px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: background 0.45s var(--ease-out), color 0.45s, border-color 0.45s, transform 0.45s var(--ease-out);
}
.btn:hover { transform: translateY(-1px); }
.btn-ink { background: var(--ink); color: var(--mist); border: 1px solid var(--ink); }
.btn-ink:hover { background: #34373a; }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid rgba(38, 40, 42, 0.35); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-warm { background: var(--warm); color: #faf5ec; border: 1px solid var(--warm); }
.btn-warm:hover { background: var(--warm-deep); }

.textlink {
  display: inline-block;
  margin-top: 1.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 40, 42, 0.3);
  padding-bottom: 0.15rem;
  transition: border-color 0.4s;
}
.textlink::after { content: " →"; }
.textlink:hover { border-color: var(--ink); }

/* scroll hint */

.scroll-hint {
  position: absolute;
  bottom: 7vh;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}
.scroll-hint-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-50);
}
.scroll-hint-line {
  width: 1px;
  height: 54px;
  background: var(--ink-12);
  position: relative;
  overflow: hidden;
}
.scroll-hint-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: -40%;
  width: 100%;
  height: 40%;
  background: var(--ink-70);
  animation: hint-fall 2.8s cubic-bezier(0.6, 0.05, 0.35, 1) infinite;
}
@keyframes hint-fall {
  0% { top: -40%; }
  62%, 100% { top: 105%; }
}

/* cards */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
  margin-top: 2.4rem;
}
.card {
  background: rgba(247, 245, 240, 0.66);
  border: 1px solid rgba(38, 40, 42, 0.09);
  border-radius: 4px;
  padding: 1.9rem 1.7rem 1.7rem;
  backdrop-filter: blur(2px);
}
.card-tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-50);
  margin-bottom: 1.1rem;
}
.card p { font-size: 0.95rem; line-height: 1.65; color: var(--ink-70); }
.card .textlink { margin-top: 1.2rem; font-size: 0.9rem; }

/* steps */

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
  margin-top: 2.2rem;
  counter-reset: step;
}
.steps li {
  background: rgba(247, 245, 240, 0.66);
  border: 1px solid rgba(38, 40, 42, 0.09);
  border-radius: 4px;
  padding: 1.6rem 1.4rem 1.5rem;
}
.step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--warm);
  margin-bottom: 1rem;
}
.steps h3 { font-size: 1.25rem; }
.steps p { font-size: 0.92rem; line-height: 1.6; color: var(--ink-70); }
.disclaimer {
  margin-top: 2.2rem;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--ink-50);
  max-width: 46rem;
}

/* teacher */

.quote {
  margin: 2.2rem 0;
  padding-left: 1.6rem;
  border-left: 2px solid rgba(38, 40, 42, 0.18);
}
.quote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.5rem;
  line-height: 1.4;
  color: var(--ink);
}
.quote footer {
  margin-top: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
}
.seal { transform: rotate(-2.5deg); opacity: 0.93; flex-shrink: 0; }
.quote cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-50);
}

.credentials {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem 1.6rem;
  margin-top: 0.6rem;
}
.credentials li {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--ink-70);
  padding-left: 1.1rem;
  position: relative;
}
.credentials li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 1.5px;
  background: var(--ink-50);
}

/* closing */

.station-closing { padding-bottom: 26vh; }
.clearing-closing .cta-row { margin-top: 2.2rem; }
.closing-alt { margin-top: 1.6rem; font-size: 0.9rem; color: var(--ink-70); }
.closing-alt a { color: var(--ink); text-decoration: none; border-bottom: 1px solid rgba(38, 40, 42, 0.3); }
.closing-alt a:hover { color: var(--ink); }

/* footer */

.footer {
  position: relative;
  z-index: 5;
  border-top: 1px solid rgba(38, 40, 42, 0.1);
  background: rgba(243, 236, 223, 0.72);
  backdrop-filter: blur(3px);
}
.footer-inner {
  max-width: 62rem;
  margin: 0 auto;
  padding: 2.6rem clamp(1.4rem, 5vw, 4rem) 3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem 3rem;
  align-items: baseline;
  justify-content: space-between;
}
.footer-brand { font-family: var(--font-display); font-size: 1.15rem; font-weight: 500; }
.footer-links { display: flex; gap: 1.8rem; }
.footer-links a {
  font-size: 0.85rem;
  color: var(--ink-70);
  text-decoration: none;
  padding: 0.4rem 0;
}
.footer-links a:hover { color: var(--ink); }
.footer-meta { font-size: 0.78rem; color: var(--ink-50); text-align: right; line-height: 1.7; }
.footer-proto { font-family: var(--font-mono); font-size: 0.625rem; letter-spacing: 0.22em; }

/* ---------- entrance choreography ---------- */

.clearing > * {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 1.3s var(--ease-out), transform 1.3s var(--ease-out);
}
.clearing.is-visible > * { opacity: 1; transform: none; }
.clearing.is-visible > *:nth-child(1) { transition-delay: 0.05s; }
.clearing.is-visible > *:nth-child(2) { transition-delay: 0.16s; }
.clearing.is-visible > *:nth-child(3) { transition-delay: 0.28s; }
.clearing.is-visible > *:nth-child(4) { transition-delay: 0.4s; }
.clearing.is-visible > *:nth-child(5) { transition-delay: 0.52s; }
.clearing.is-visible > *:nth-child(6) { transition-delay: 0.62s; }

body.reduced-motion .clearing > *,
body.no-webgl .clearing > * {
  opacity: 1;
  transform: none;
  transition: none;
}
@media (prefers-reduced-motion: reduce) {
  .clearing > * { opacity: 1; transform: none; transition: none; }
  .scroll-hint-line::after { animation: none; top: 30%; }
  .btn:hover { transform: none; }
}

/* no-webgl fallback sky */
body.no-webgl { background: linear-gradient(#e8e6e0, #f3ecdf); }
body.no-webgl #world { display: none; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .cards { grid-template-columns: 1fr; max-width: 30rem; margin-left: auto; margin-right: auto; }
  .steps { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  body { font-size: 1rem; }
  .nav { padding: 1rem 1.2rem; }
  .nav-links { display: none; }
  .nav-cta { padding: 0.65rem 1.05rem; font-size: 0.625rem; }
  .station { padding-top: 26vh; padding-bottom: 26vh; }
  .station-hero { padding-top: 16vh; }
  .steps { grid-template-columns: 1fr; }
  .credentials { grid-template-columns: 1fr; }
  .rail { display: none; }
  .hud { left: 1.1rem; bottom: 1rem; }
  .hud-label { display: none; }
  .clearing::before { inset: -14% -10%; }
  .quote p { font-size: 1.3rem; }
}