@import url("https://fonts.googleapis.com/css2?family=Big+Shoulders+Display:wght@700&family=JetBrains+Mono:wght@400;500;700&family=Zen+Kaku+Gothic+New:wght@400;700&display=swap");

:root {
  --paper: #0c100b;
  --raised: #141a12;
  --sunken: #141a12;
  --line: #28301f;
  --ink: #e9eee1;
  --ink-2: #9ba492;
  --ink-3: #6e7767;
  --moss: #c7e541;
  --cap: #e0916b;
  --spore: #e6c24f;
  --loss: #ff8163;
  --on-accent: #0c100b;
  --font-display: "Big Shoulders Display", "Oswald", "Arial Narrow", sans-serif;
  --font-text: "Zen Kaku Gothic New", "Noto Sans JP", system-ui, sans-serif;
  --font-data: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --nav-h: 104px;
  --mobile-nav-height: 66px;
  --mobile-safe-top: env(safe-area-inset-top, 0px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  border-radius: 0 !important;
}

html {
  height: 100%;
  scroll-behavior: auto;
}

body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-text);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

.shroom-site {
  min-height: 100vh;
  color: var(--ink);
  background-color: var(--paper);
  background-image: url("brand/background-texture.webp");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
}

.shroom-display {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  font-weight: 700;
}

.shroom-data {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

/* ---------- Nav ---------- */
.shroom-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.shroom-brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}

.shroom-brand-mark {
  width: 40px;
  height: 55px;
  object-fit: contain;
  flex-shrink: 0;
}

.shroom-wordmark {
  font-size: 36px;
  line-height: 1;
  transform: translateY(12px);
}

.shroom-desktop-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.shroom-desktop-nav > a {
  font-size: 15px;
  color: var(--ink-2);
  transition: color 0.15s;
}

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

.shroom-socials {
  display: flex;
  align-items: center;
  gap: 16px;
}

.shroom-socials a {
  color: var(--ink-2);
  display: inline-flex;
  transition: color 0.15s;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 42px;
  padding: 8px 16px;
  font-family: var(--font-data);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: 1px solid var(--line);
  transition: opacity 0.15s, border-color 0.15s;
}

.btn-moss {
  background: var(--moss);
  color: var(--on-accent);
  border-color: var(--moss);
}

.btn-moss:hover {
  opacity: 0.9;
}

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

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

.shroom-mobile-actions {
  display: none;
  align-items: center;
  gap: 8px;
  z-index: 52;
  position: relative;
}

.shroom-menu-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: var(--raised);
  color: var(--ink);
  display: grid;
  place-items: center;
}

.shroom-menu-toggle[aria-expanded="true"] {
  color: var(--moss);
  border-color: var(--moss);
}

.shroom-mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 51;
  overflow-y: auto;
  flex-direction: column;
  padding: calc(var(--mobile-nav-height) + var(--mobile-safe-top) + 50px)
    max(24px, env(safe-area-inset-right))
    calc(28px + env(safe-area-inset-bottom))
    max(24px, env(safe-area-inset-left));
  background:
    linear-gradient(180deg, #0c100be0, var(--paper) 42%),
    url("brand/background-texture.webp") center / cover;
}

.shroom-mobile-menu.is-open {
  display: flex;
}

.shroom-mobile-menu-index {
  color: var(--ink-3);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.68rem;
  margin-bottom: 20px;
  font-family: var(--font-data);
}

.shroom-mobile-menu > a {
  border-top: 1px solid var(--line);
  min-height: 72px;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: clamp(2rem, 9vw, 3rem);
  font-weight: 700;
  line-height: 1;
  display: flex;
  align-items: center;
  gap: 18px;
}

.shroom-mobile-menu > a:last-of-type {
  border-bottom: 1px solid var(--line);
}

.shroom-mobile-menu > a > span {
  color: var(--ink-3);
  letter-spacing: 0.14em;
  font-size: 0.66rem;
  font-family: var(--font-data);
}

.shroom-mobile-menu-footer {
  display: flex;
  gap: 12px;
  margin-top: auto;
  flex-shrink: 0;
}

.shroom-mobile-menu-footer a {
  border: 1px solid var(--line);
  min-height: 48px;
  color: var(--ink-2);
  align-items: center;
  gap: 9px;
  padding: 0 16px;
  font-size: 0.82rem;
  display: flex;
}

body.menu-open {
  overflow: hidden;
}

/* ---------- Desktop scroll story ---------- */
.shroom-story-pin {
  position: relative;
  padding-top: var(--nav-h);
}

.shroom-story {
  height: calc(100vh - var(--nav-h));
  position: relative;
  overflow: hidden;
}

.shroom-story.is-pinned {
  position: sticky;
  top: var(--nav-h);
}

.shroom-story-art {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: none;
}

.shroom-story-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.shroom-story-line {
  z-index: 2;
  opacity: 0;
  visibility: hidden;
  width: min(760px, calc(100% - 96px));
  position: absolute;
  top: calc(50% - 150px);
  left: 48px;
}

.shroom-story-line.is-active {
  opacity: 1;
  visibility: visible;
}

.shroom-story-line p {
  font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2.4rem);
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
}

.shroom-story-line .line-stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.shroom-story-finale .shroom-story-line h1,
.shroom-story-finale-line h1 {
  font-size: clamp(2.4rem, 1.8rem + 3vw, 4.2rem);
  line-height: 1.05;
  color: var(--moss);
  margin: 0;
}

.shroom-story-number,
.shroom-mobile-hero-copy,
.shroom-mobile-paper-heading,
.shroom-mobile-story-track {
  display: none;
}

.shroom-scroll-hint {
  z-index: 3;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #e9eee173;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  display: flex;
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  animation: shroomScrollBounce 1.6s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shroomScrollBounce {
  0%,
  100% {
    transform: translate(-50%, 0);
  }
  50% {
    transform: translate(-50%, 6px);
  }
}

@keyframes shroomLineIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mu-note {
  margin-top: 8px;
  font-size: 0.7rem;
  color: var(--ink-3);
}

/* ---------- Content sections ---------- */
.shroom-section-grid {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 56px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 48px 128px;
  border-top: 1px solid var(--line);
}

.shroom-section-label {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 10px;
}

.shroom-mechanism-title {
  font-size: clamp(2.4rem, 1.9rem + 2.2vw, 4rem);
  line-height: 1;
  margin: 0 0 64px;
  max-width: 16ch;
}

#about .shroom-mechanism-title {
  margin-bottom: 0;
  max-width: 20ch;
}

.about-copy {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-copy p,
.risk-copy,
.mechanism-copy {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0;
  max-width: 58ch;
}

.shroom-mechanism-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}

.mechanism-index {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  margin-bottom: 20px;
}

.shroom-mechanism-step h3 {
  font-size: 1.9rem;
  line-height: 1.1;
  margin: 0 0 14px;
}

.shroom-mechanism-step p {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0;
  max-width: 34ch;
}

.shroom-mechanism-step-bordered {
  border-left: 1px solid var(--line);
  padding-left: 56px;
}

.shroom-pool-links {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.shroom-pool-links h2 {
  grid-column: 1 / -1;
  font-size: 1.9rem;
  line-height: 1.1;
  margin: 0 0 8px;
}

.shroom-pool-link {
  text-align: left;
  letter-spacing: 0;
  text-transform: none;
  justify-content: flex-start;
  gap: 12px;
  min-width: 0;
  min-height: 76px;
  padding: 18px 16px;
  font-size: 14px;
  line-height: 1.5;
}

.shroom-pool-link img {
  width: 28px;
  height: 28px;
  object-fit: contain;
  flex-shrink: 0;
}

.shroom-pool-link-arrow {
  color: var(--moss);
  margin-left: auto;
}

.shroom-pool-link-soon {
  cursor: default;
  opacity: 0.55;
  pointer-events: none;
}

.shroom-pool-link-soon .shroom-pool-link-arrow {
  color: var(--ink-3);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.risk-copy {
  font-size: 1.06rem;
  line-height: 1.7;
}

.shroom-footer {
  border-top: 1px solid var(--line);
  padding: 40px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.shroom-footer .tagline {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

.shroom-footer-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.shroom-footer-links a {
  font-size: 14px;
  color: var(--ink-2);
}

.shroom-footer-links a:hover {
  color: var(--ink);
}

/* ---------- Mobile ---------- */
@media (max-width: 1023px) {
  .shroom-site {
    background-size: auto 100vh !important;
    background-attachment: scroll !important;
    overflow-x: clip;
  }

  .shroom-nav {
    min-height: var(--mobile-nav-height);
    padding: calc(9px + var(--mobile-safe-top)) max(18px, env(safe-area-inset-right)) 9px
      max(18px, env(safe-area-inset-left));
    background: color-mix(in srgb, var(--paper) 92%, transparent);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
  }

  .shroom-brand-mark {
    width: 28px;
    height: 39px;
  }

  .shroom-wordmark {
    font-size: 27px !important;
    transform: translateY(7px) !important;
  }

  .shroom-desktop-nav {
    display: none !important;
  }

  .shroom-mobile-actions {
    display: flex;
  }

  .shroom-story-pin {
    height: auto !important;
    min-height: 0 !important;
    padding-top: 0 !important;
  }

  .shroom-story,
  .shroom-story.is-pinned {
    height: auto;
    position: relative;
    top: auto;
    margin-top: 0;
    padding-top: calc(var(--mobile-nav-height) + var(--mobile-safe-top));
    overflow: visible;
  }

  .shroom-story-intro,
  .shroom-story-finale,
  .shroom-scroll-hint,
  .desktop-only-lines {
    display: none !important;
  }

  .shroom-mobile-hero-copy,
  .shroom-mobile-paper-heading,
  .shroom-mobile-story-track,
  .shroom-story-number {
    display: block;
  }

  .shroom-story-art {
    position: relative;
    inset: auto;
    opacity: 1 !important;
  }

  .shroom-mobile-hero-art,
  .shroom-mobile-story-card-art {
    aspect-ratio: 16 / 9;
    background: #080c08;
    width: 100%;
    position: relative;
    overflow: hidden;
  }

  .shroom-mobile-hero-art img,
  .shroom-mobile-story-card-art img {
    object-fit: contain !important;
  }

  .shroom-mobile-hero-copy {
    padding: 30px max(20px, env(safe-area-inset-right)) 54px
      max(20px, env(safe-area-inset-left));
  }

  .shroom-mobile-kicker {
    color: var(--moss);
    letter-spacing: 0.13em;
    text-transform: uppercase;
    margin-bottom: 14px;
    font-size: 0.64rem;
  }

  .shroom-mobile-hero h1 {
    max-width: 8.5ch;
    color: var(--ink);
    text-wrap: balance;
    margin: 0;
    font-size: clamp(3.35rem, 15vw, 5.2rem);
    line-height: 0.88;
  }

  .shroom-mobile-hero-copy > p {
    max-width: 30ch;
    color: var(--ink-2);
    margin: 18px 0 0;
    font-size: 1rem;
    line-height: 1.5;
  }

  .shroom-mobile-paper-heading {
    border-top: 1px solid var(--line);
    padding: 54px max(20px, env(safe-area-inset-right)) 20px
      max(20px, env(safe-area-inset-left));
  }

  .shroom-mobile-paper-heading .shroom-data {
    color: var(--ink-3);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-size: 0.66rem;
  }

  .shroom-mobile-paper-heading p {
    color: var(--ink-2);
    margin: 8px 0 0;
    font-size: 0.95rem;
  }

  .shroom-mobile-story-track {
    display: grid;
    gap: 14px;
    padding: 0 max(20px, env(safe-area-inset-right)) 58px
      max(20px, env(safe-area-inset-left));
  }

  .shroom-mobile-story-card {
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--raised) 92%, transparent);
    overflow: hidden;
  }

  .shroom-mobile-story-card-copy {
    border-top: 1px solid var(--line);
    min-height: 170px;
    padding: 22px;
  }

  .shroom-mobile-story-card-copy > .shroom-data:first-child {
    color: var(--moss);
    letter-spacing: 0.16em;
    margin-bottom: 16px;
    font-size: 0.65rem;
  }

  .shroom-mobile-story-card-copy .shroom-story-line {
    position: static;
    width: auto;
    opacity: 1;
    visibility: visible;
  }

  .shroom-mobile-story-card-copy .shroom-story-line p {
    font-size: clamp(1.18rem, 5.3vw, 1.45rem) !important;
    line-height: 1.35 !important;
  }

  .shroom-section-grid {
    width: 100%;
    padding: 52px max(18px, env(safe-area-inset-right)) 76px
      max(18px, env(safe-area-inset-left)) !important;
    grid-template-columns: 1fr !important;
    gap: 28px !important;
  }

  .shroom-section-label {
    color: var(--moss) !important;
    padding-top: 0 !important;
  }

  .shroom-mechanism-title {
    margin-bottom: 42px !important;
    font-size: clamp(2.75rem, 13vw, 4rem) !important;
    line-height: 0.94 !important;
  }

  .shroom-mechanism-grid {
    grid-template-columns: 1fr !important;
    gap: 34px !important;
  }

  .shroom-mechanism-step-bordered {
    border-top: 1px solid var(--line);
    border-left: 0 !important;
    padding-top: 34px !important;
    padding-left: 0 !important;
  }

  .shroom-pool-links {
    grid-template-columns: 1fr;
  }

  .shroom-footer {
    flex-direction: column;
    align-items: flex-start !important;
    padding: 30px max(18px, env(safe-area-inset-right))
      calc(30px + env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left)) !important;
    gap: 22px !important;
  }

  .shroom-footer-links {
    justify-content: space-between;
    width: 100%;
    min-height: 44px;
  }
}

@media (max-width: 700px) {
  .shroom-pool-links {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .shroom-scroll-hint {
    animation: none;
  }

  * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}