/* Konzept 01 — Tusche im Wasser
   Paper, ink, one vermillion seal. Nothing moves fast. */

:root {
  --paper: #f6f3ec;
  --paper-warm: #efeadf;
  --paper-light: #faf8f3;
  --ink: #26241f;
  --ink-soft: #4a463f;
  --ink-mute: #7d776c;
  --hairline: rgba(38, 36, 31, 0.16);
  --hairline-strong: rgba(38, 36, 31, 0.32);
  --seal: #a23528;
  --seal-dark: #86281e;
  --font-display: 'Cormorant Garamond', 'Times New Roman', serif;
  --font-ui: 'Inter', -apple-system, sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --max: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

::selection { background: rgba(162, 53, 40, 0.16); }

/* ---------- water & paper layers ---------- */

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

#still {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  align-items: center;
  justify-content: center;
}
#still svg { width: min(72vh, 86vw); height: min(72vh, 86vw); }
body.no-motion #still { display: flex; }
body.no-motion #ink { display: none; }

.grain {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.055;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 240px 240px;
}

main, footer { position: relative; z-index: 2; }

/* ---------- typography ---------- */

.eyebrow {
  font-family: var(--font-ui);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 1.6rem;
}

h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.9rem, 7.6vw, 6.4rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--ink);
}
h1 em { font-style: italic; font-weight: 400; }

h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 4.4vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin-bottom: 1.8rem;
  max-width: 20ch;
}

h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

.body {
  color: var(--ink-soft);
  max-width: 58ch;
  margin-bottom: 1.4rem;
  font-size: 0.9975rem;
}

/* ---------- header ---------- */

.site-head {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.3rem clamp(1.4rem, 4vw, 3.2rem);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 1.4s var(--ease-out) 0.2s, transform 1.4s var(--ease-out) 0.2s,
              background 0.5s ease, box-shadow 0.5s ease;
}
body.intro-done .site-head, body.no-motion .site-head { opacity: 1; transform: none; }
.site-head.scrolled {
  background: rgba(246, 243, 236, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--hairline);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--ink);
}
.brand-enso {
  width: 15px;
  height: 15px;
  border: 1.6px solid var(--ink);
  border-radius: 50%;
  border-top-color: transparent;
  transform: rotate(-42deg);
  flex-shrink: 0;
}
.brand-word {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.015em;
  white-space: nowrap;
}

.site-nav { display: flex; gap: 2rem; margin-left: auto; }
.site-nav a {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  padding: 1rem 0;
  position: relative;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0.7rem;
  width: 100%;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s var(--ease-out);
}
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }

/* ---------- buttons & links ---------- */

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.8em 1.7em;
  background: var(--seal);
  color: var(--paper-light);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 2px;
  transition: background 0.45s ease, transform 0.45s var(--ease-out);
}
.cta:hover, .cta:focus-visible { background: var(--seal-dark); transform: translateY(-1px); }
.cta-small { padding: 0.65em 1.3em; min-height: 40px; }

.cta-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0.6em 1.3em;
  border: 1px solid var(--hairline-strong);
  border-radius: 2px;
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  transition: border-color 0.45s ease, background 0.45s ease;
  white-space: nowrap;
}
.cta-outline:hover, .cta-outline:focus-visible { border-color: var(--ink); background: rgba(250, 248, 243, 0.7); }
.cta-large { font-size: 0.8rem; padding: 1em 2.2em; }

.link-quiet {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-strong);
  transition: border-color 0.4s ease, color 0.4s ease;
}
.link-quiet:hover, .link-quiet:focus-visible { color: var(--ink); border-color: var(--ink); }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 44px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}
.link-more::after {
  content: "";
  width: 2.2rem;
  height: 1px;
  background: var(--ink);
  transition: width 0.55s var(--ease-out);
}
.link-more:hover::after, .link-more:focus-visible::after { width: 3.6rem; }

/* ---------- hero ---------- */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 6rem clamp(1.4rem, 5vw, 3rem) 5rem;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background: radial-gradient(62% 48% at 50% 52%,
              rgba(246, 243, 236, 0.72) 0%,
              rgba(246, 243, 236, 0.34) 55%,
              rgba(246, 243, 236, 0) 100%);
  opacity: 0;
  transition: opacity 2.4s ease;
  pointer-events: none;
}
body.intro-done .hero-veil, body.no-motion .hero-veil { opacity: 1; }

.hero-inner {
  position: relative;
  max-width: 60rem;
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 1.9s var(--ease-out), transform 1.9s var(--ease-out);
}
body.intro-done .hero-inner, body.no-motion .hero-inner { opacity: 1; transform: none; }

.hero .eyebrow { margin-bottom: 2.2rem; }
.hero .lead {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.1vw, 1.45rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 44rem;
  margin: 2.4rem auto 0;
}
.hero .meta {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  margin-top: 1.6rem;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-top: 2.8rem;
  flex-wrap: wrap;
}

.scroll-hint {
  position: absolute;
  bottom: 2.2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 44px;
  height: 64px;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0;
  transition: opacity 2s ease 1s;
}
body.intro-done .scroll-hint, body.no-motion .scroll-hint { opacity: 1; }
.scroll-hint span {
  display: block;
  width: 1px;
  height: 44px;
  margin: 0 auto;
  background: var(--ink-soft);
  transform-origin: top;
  animation: hintBreath 4.6s ease-in-out infinite;
}
@keyframes hintBreath {
  0%, 100% { transform: scaleY(0.45); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 0.9; }
}

/* ---------- sections ---------- */

.section, .interlude, .closing { position: relative; }

.section-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(6rem, 13vh, 9.5rem) clamp(1.4rem, 5vw, 3rem);
}

.side-label {
  position: absolute;
  top: clamp(6rem, 13vh, 9.5rem);
  left: clamp(0.9rem, 2vw, 2.2rem);
  writing-mode: vertical-rl;
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(38, 36, 31, 0.42);
}
.side-label::before {
  content: "";
  display: block;
  width: 1px;
  height: 3rem;
  margin: 0 auto 1.2rem;
  background: var(--hairline-strong);
}

.grid-2 {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: center;
}
.grid-lehrer { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

.ink-frame {
  position: relative;
  overflow: hidden;
  border-radius: 2px;
  box-shadow: 0 24px 60px -30px rgba(38, 36, 31, 0.45);
}
.ink-frame img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.88) contrast(0.98); }
.ink-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 0 1px rgba(38, 36, 31, 0.12);
  border-radius: 2px;
  pointer-events: none;
}
figcaption {
  margin-top: 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}

/* ---------- interlude ---------- */

.interlude { text-align: center; }
.interlude .section-inner { padding-top: clamp(7rem, 16vh, 12rem); padding-bottom: clamp(7rem, 16vh, 12rem); }
.interlude .eyebrow { margin-bottom: 2.4rem; }
.interlude-line {
  font-size: clamp(2.4rem, 5.6vw, 4.6rem);
  line-height: 1.22;
  max-width: none;
  margin: 0 auto 4.5rem;
}
.triad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.6rem, 4vw, 3.5rem);
  max-width: 62rem;
  margin: 0 auto;
  text-align: left;
}
.triad-item { border-top: 1px solid var(--hairline-strong); padding-top: 1.4rem; }
.triad-item h3 { font-size: 1.15rem; }
.triad-item p { font-size: 0.9rem; color: var(--ink-soft); }

/* ---------- cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.2rem, 2.5vw, 2rem);
  margin-top: 3.2rem;
}
.card {
  position: relative;
  padding: 2.4rem 2rem 2rem;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  background: rgba(250, 248, 243, 0.75);
  transition: border-color 0.6s ease, transform 0.6s var(--ease-out), background 0.6s ease;
  display: flex;
  flex-direction: column;
}
.card:hover {
  border-color: var(--hairline-strong);
  background: rgba(250, 248, 243, 0.95);
  transform: translateY(-3px);
}
.card-stroke {
  position: absolute;
  top: -1px;
  left: 1.6rem;
  width: 3.4rem;
  height: 2px;
  background: var(--ink);
  transition: width 0.7s var(--ease-out);
}
.card:hover .card-stroke { width: 5.2rem; }
.card-num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.9rem;
  color: rgba(38, 36, 31, 0.25);
  line-height: 1;
  margin-bottom: 1.6rem;
}
.card h3 { font-size: 1.4rem; }
.card p { font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 1.6rem; }
.card .link-more { margin-top: auto; }

/* ---------- ZPP steps ---------- */

.section-zpp .intro { margin-bottom: 0; }
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1.2rem, 2.5vw, 2.4rem);
  margin: 3.4rem 0 2.6rem;
  counter-reset: step;
}
.steps li { border-top: 1px solid var(--hairline-strong); padding-top: 1.3rem; position: relative; }
.step-num {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: 3.4rem;
  line-height: 1;
  color: rgba(38, 36, 31, 0.22);
  margin-bottom: 0.9rem;
}
.steps h3 { font-size: 1.2rem; }
.steps p { font-size: 0.88rem; color: var(--ink-soft); }

.disclaimer {
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-mute);
  max-width: 62ch;
  border-left: 1px solid var(--hairline-strong);
  padding-left: 1.2rem;
  margin-bottom: 2.2rem;
}

/* ---------- teacher ---------- */

.portrait .ink-frame { aspect-ratio: 4 / 5; }
blockquote {
  margin: 2rem 0;
  padding-left: 1.4rem;
  border-left: 1px solid var(--hairline-strong);
}
blockquote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.3rem, 2vw, 1.55rem);
  line-height: 1.45;
  color: var(--ink);
}
.credentials {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 2.4rem;
  margin: 0 0 2.2rem;
  max-width: 46rem;
}
.credentials li {
  font-size: 0.85rem;
  color: var(--ink-soft);
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--hairline);
}

/* ---------- closing ---------- */

.closing { text-align: center; }
.closing .section-inner {
  padding-top: clamp(7rem, 16vh, 12rem);
  padding-bottom: clamp(6rem, 12vh, 9rem);
}
.closing h2 { margin: 0 auto 1.6rem; }
.closing .body { margin: 0 auto 3rem; }
.seal { width: 52px; height: 52px; margin: 0 auto 2.6rem; }
.seal svg { width: 100%; height: 100%; display: block; }
.closing-actions { display: flex; flex-direction: column; align-items: center; gap: 1.4rem; }
.closing .alt { font-size: 0.82rem; color: var(--ink-mute); }
.closing .alt a { color: var(--ink-soft); text-decoration-color: var(--hairline-strong); text-underline-offset: 3px; }
.closing .alt a:hover { color: var(--ink); }

/* ---------- footer ---------- */

.site-foot { border-top: 1px solid var(--hairline); }
.foot-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem clamp(1.4rem, 5vw, 3rem) 3.4rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem 3rem;
  align-items: baseline;
}
.foot-brand { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; }
.foot-line { font-size: 0.78rem; color: var(--ink-mute); grid-column: 1; }
.foot-line.small { font-size: 0.7rem; }
.foot-nav { grid-column: 2; grid-row: 1 / 4; display: flex; gap: 1.8rem; align-self: center; }
.foot-nav a {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  text-decoration: none;
  padding: 0.6rem 0;
}
.foot-nav a:hover { color: var(--ink); }

/* ---------- reveal choreography ---------- */

.reveal, .reveal-group > * {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 1.15s var(--ease-out), transform 1.15s var(--ease-out);
}
.reveal.in, .reveal-group.in > * { opacity: 1; transform: none; }
.reveal-group.in > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-group.in > *:nth-child(2) { transition-delay: 0.17s; }
.reveal-group.in > *:nth-child(3) { transition-delay: 0.29s; }
.reveal-group.in > *:nth-child(4) { transition-delay: 0.41s; }
.reveal-group.in > *:nth-child(5) { transition-delay: 0.53s; }
.reveal-group.in > *:nth-child(6) { transition-delay: 0.65s; }

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

@media (max-width: 1100px) {
  .side-label { display: none; }
}

@media (max-width: 900px) {
  .grid-2, .grid-lehrer { grid-template-columns: 1fr; gap: 3rem; }
  .grid-lehrer .col-figure { order: -1; max-width: 26rem; }
  .cards { grid-template-columns: 1fr; max-width: 30rem; }
  .steps { grid-template-columns: 1fr 1fr; }
  .triad { grid-template-columns: 1fr; max-width: 30rem; }
  .site-nav { display: none; }
}

@media (max-width: 600px) {
  .steps { grid-template-columns: 1fr; }
  .credentials { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; gap: 1.2rem; }
  .brand-word { font-size: 1rem; }
  .site-head { padding: 1rem 1.2rem; gap: 1rem; }
  .cta-outline { font-size: 0.62rem; letter-spacing: 0.08em; padding: 0.55em 0.9em; }
  .foot-inner { grid-template-columns: 1fr; }
  .foot-nav { grid-column: 1; grid-row: auto; margin-top: 1rem; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-group > * { opacity: 1; transform: none; transition: none; }
  .site-head, .hero-inner, .hero-veil, .scroll-hint { opacity: 1; transform: none; transition: none; }
  .scroll-hint span { animation: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}