/* 翰源堂 Hanwellspring
   版面原則：畫是主角，介面退到四角；不對稱構圖、直排為骨、字級對比拉開；
   平塗用色，不加紋飾與漸層字。
   畫法照遊戲專案的美術 bible「玄彩厚筆」：題字用玄彩筆、內文用霞鶩文楷；
   線與外框是畫出來的筆痕（素材在 assets/img），特效是會動的筆痕。 */

@font-face {
  font-family: "Xuancai Brush";
  src: url("/assets/fonts/XuancaiBrush-site.woff2") format("woff2");
  font-display: swap;
}

:root {
  --ink: #061016;
  --ink-deep: #03090d;
  /* 素白三階與金，取自美術 bible §5.2 */
  --paper: #f2ebdd;
  --dim: #cfc6b4;
  --mute: #a39b8f;
  --gold: #d4a93a;
  --gold-hi: #f0d36b;
  --line: rgba(242, 235, 221, 0.14);
  --line-strong: rgba(242, 235, 221, 0.34);

  /* 內文與介面：霞鶩文楷；題字：玄彩筆（只有一個字重，只用在大字） */
  --serif: "LXGW WenKai TC", "DFKai-SB", "BiauKai", "Noto Serif TC", serif;
  --sans: "LXGW WenKai TC", "DFKai-SB", "BiauKai", "Noto Sans TC", sans-serif;
  --latin: "Cormorant Garamond", "LXGW WenKai TC", Georgia, serif;
  --brush: "Xuancai Brush", "LXGW WenKai TC", "DFKai-SB", "BiauKai", serif;

  --wrap: 1320px;
  --gutter: clamp(1.25rem, 5vw, 4.5rem);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ------------------------------------------------------------------ base */

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

html {
  font-size: 106.25%; /* 楷體字面偏小，整體放大一級 */
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

html[data-menu] {
  overflow: hidden;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 沒有 WebGL 時的靜態背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, #0a202a, var(--ink) 65%);
}

.i18n-pending body {
  visibility: hidden;
}

h1,
h2,
h3,
p,
dl,
dd,
ol,
figure,
blockquote {
  margin: 0;
}

ol {
  padding: 0;
  list-style: none;
}

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

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

i {
  font-style: normal;
}

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

:focus-visible {
  outline: 1px solid var(--gold-hi);
  outline-offset: 5px;
}

/* 轉場後焦點會移到章節本身（給鍵盤與讀屏接續用），整段不需要畫外框 */
main section:focus {
  outline: none;
}

::selection {
  background: var(--gold);
  color: var(--ink-deep);
}

.skip {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 300;
  padding: 0.5rem 1rem;
  background: var(--paper);
  color: var(--ink-deep);
  transform: translateY(-200%);
}

.skip:focus {
  transform: none;
}

.wrap {
  position: relative;
  width: min(100% - 2 * var(--gutter), var(--wrap));
  margin-inline: auto;
}

/* 題字用玄彩筆。中文題字在英文版會換成英文，所以前半只在中文版套用 */
html[lang="zh-Hant"] :is(.statement, .chara__lead, .contact__headline, .hero__tagline, .index__name),
html :is(.world__title, .chara__name, .show__title, .lost__title, .brand__mark, .loader__mark, .mv__play) {
  font-family: var(--brush);
  font-weight: 400; /* 玄彩筆只有一個字重，別讓瀏覽器硬加粗 */
}

/* 英文版的「播放」換成英文，用回歐文字體 */
html[lang="en"] .mv__play {
  font-family: var(--latin);
}

/* 文字連結：字後拖一道會伸長的乾筆 */
.go {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  min-height: 2.75rem;
  color: var(--paper);
  font: 500 0.95rem/1.4 var(--serif);
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: color 0.25s ease;
}

.go::after {
  content: "";
  width: 3rem;
  height: 0.42rem;
  background: currentColor;
  -webkit-mask: url("/assets/img/stroke.webp") left center / 100% 100% no-repeat;
  mask: url("/assets/img/stroke.webp") left center / 100% 100% no-repeat;
  transform-origin: 0 50%;
  transition: transform 0.45s var(--ease);
}

.go:hover {
  color: #fff;
}

.go:hover::after {
  transform: scaleX(1.75);
}

.go--main {
  color: var(--gold-hi);
}

[lang="en"] .go {
  letter-spacing: 0.06em;
}

.link {
  padding-bottom: 0.2rem;
  background: linear-gradient(currentColor, currentColor) 0 100% / 100% 1px no-repeat;
  transition:
    background-size 0.35s var(--ease),
    color 0.25s ease;
}

.link:hover {
  background-position: 100% 100%;
  background-size: 0 1px;
  color: var(--gold-hi);
}

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

.loader {
  display: none;
}

.js .loader {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background: var(--ink);
  transition:
    opacity 0.55s ease,
    visibility 0s 0.55s;
}

.ready .loader {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader__mark {
  font-size: clamp(3rem, 9vw, 5rem);
  line-height: 1.3;
  letter-spacing: 0.1em;
  animation: write 0.8s var(--ease) both;
}

/* 由左往右寫出來 */
@keyframes write {
  from {
    clip-path: inset(-20% 100% -20% -5%);
  }
  to {
    clip-path: inset(-20% -5% -20% -5%);
  }
}

/* ------------------------------------------------------------------ 轉場 */

/* 「穿雲」：fx.js 把漫過畫面的雲畫在這張畫布上，蓋在整頁最上層 */
.fx {
  position: fixed;
  inset: 0;
  z-index: 150;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.fx[hidden] {
  display: none;
}

/* ---------------------------------------------------------------- canvas */

.gl {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.2s ease;
}

.gl-on .gl {
  opacity: 1;
}

main,
.colophon {
  position: relative;
  z-index: 1;
}

/* ------------------------------------------------------------- 四角介面 */

.hud {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.1rem var(--gutter);
  pointer-events: none;
}

.hud > * {
  pointer-events: auto;
}

/* 內文捲到頂端時淡出，不會跟目錄文字打架 */
.hud::before {
  content: "";
  position: absolute;
  inset: 0 0 -5rem;
  z-index: -2;
  background: linear-gradient(rgba(3, 9, 13, 0.92), rgba(3, 9, 13, 0.6) 38%, rgba(3, 9, 13, 0.2) 72%, transparent);
  pointer-events: none;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}

.brand__mark {
  font-size: 1.8rem;
  line-height: 1;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

@media (max-width: 560px) {
  .brand i {
    display: none;
  }
}

.brand i {
  color: var(--mute);
  font: italic 500 0.9rem/1 var(--latin);
  letter-spacing: 0.05em;
}

.menu {
  display: flex;
  gap: clamp(1.1rem, 2.6vw, 2.6rem);
}

.menu a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.6rem 0;
  color: var(--dim);
  font-size: 0.86rem;
  letter-spacing: 0.22em;
  transition: color 0.25s ease;
}

.menu b {
  color: var(--gold);
  font: 500 0.74rem/1 var(--serif);
  letter-spacing: 0;
}

.menu span {
  padding-bottom: 0.3rem;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size 0.4s var(--ease);
}

.menu a:hover,
.menu a[aria-current] {
  color: #fff;
}

.menu a:hover span,
.menu a[aria-current] span {
  background-size: 100% 1px;
}

[lang="en"] .menu a {
  letter-spacing: 0.08em;
}

.tools {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.tool {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 2.75rem;
  color: var(--dim);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  white-space: nowrap;
  transition: color 0.25s ease;
}

.tool:hover,
.tool[aria-pressed="true"] {
  color: #fff;
}

.tool[hidden] {
  display: none;
}

.sound__bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 0.8rem;
}

.sound__bars i {
  width: 1px;
  height: 30%;
  background: currentColor;
}

.sound[aria-pressed="true"] .sound__bars i {
  animation: eq 0.9s ease-in-out infinite;
}

.sound__bars i:nth-child(2) {
  animation-delay: -0.3s;
}
.sound__bars i:nth-child(3) {
  animation-delay: -0.6s;
}

@keyframes eq {
  0%,
  100% {
    height: 25%;
  }
  50% {
    height: 100%;
  }
}

.burger,
.burger__close {
  display: none;
}

/* 窄螢幕：目錄變成整頁的直排書脊 */
@media (max-width: 900px) {
  .burger {
    display: inline-flex;
  }

  [data-open] .burger__open {
    display: none;
  }

  [data-open] .burger__close {
    display: inline;
  }

  .menu {
    position: fixed;
    inset: 0;
    z-index: -1;
    flex-direction: row-reverse;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 5rem var(--gutter) 2rem;
    background: var(--ink-deep);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity 0.35s ease,
      visibility 0s 0.35s;
  }

  [data-open] .menu {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
  }

  .menu a {
    gap: 1rem;
    padding: 1.5rem clamp(0.7rem, 3.4vw, 1.4rem);
    border-left: 1px solid var(--line);
    color: var(--paper);
    font: 600 clamp(1.7rem, 7.6vw, 2.5rem) / 1 var(--serif);
    letter-spacing: 0.3em;
    writing-mode: vertical-rl;
  }

  .menu a:last-child {
    border-left: 0;
  }

  .menu b {
    font-size: 0.8rem;
  }

  html[lang="zh-Hant"] .menu a {
    font-family: var(--brush);
    font-weight: 400;
  }

  .menu span {
    padding: 0;
    background: none;
  }

  [lang="en"] .menu a {
    letter-spacing: 0.12em;
  }

  .tools {
    gap: 1.2rem;
  }
}

/* 左側章節標示 */
.chapter {
  position: fixed;
  top: 50%;
  left: calc(var(--gutter) * 0.36);
  z-index: 40;
  display: grid;
  justify-items: center;
  gap: 1rem;
  color: var(--dim);
  font: 500 0.74rem/1 var(--serif);
  letter-spacing: 0.5em;
  transform: translateY(-50%);
}

.chapter span {
  writing-mode: vertical-rl;
}

.chapter__bar {
  position: relative;
  display: block;
  width: 1px;
  height: 4.5rem;
  background: var(--line);
}

.chapter__bar i {
  position: absolute;
  inset: 0;
  background: var(--gold);
  transform: scaleY(var(--p, 0));
  transform-origin: 50% 0;
}

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

/* ------------------------------------------------------------------ 序 */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
}

/* 沒有 WebGL（或關閉 JS）時，主視覺改用一般背景圖 */
html:not(.gl-on) .hero {
  background: url("/assets/img/art-hero-wide.webp") center / cover no-repeat;
}

@media (max-aspect-ratio: 4/5) {
  html:not(.gl-on) .hero {
    background-image: url("/assets/img/art-hero-tall.webp");
  }
}

/* 左下（內文）與底部壓暗，其餘留給畫。題字後面的暗暈由 WebGL 自己畫 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(85% 85% at 0% 100%, rgba(3, 9, 13, 0.76), rgba(3, 9, 13, 0.4) 42%, transparent 74%),
    linear-gradient(0deg, var(--ink), transparent 20%);
  pointer-events: none;
}

/* 大標直排靠右，旁邊一行小字與印，像畫上的題款 */
.hero__mark {
  position: absolute;
  top: 52%;
  right: clamp(1.25rem, 8.5vw, 9rem);
  display: flex;
  align-items: flex-start;
  gap: clamp(0.9rem, 1.8vw, 1.8rem);
  transform: translateY(-50%);
}

.hero__title {
  padding-top: 0.14em;
  color: var(--paper);
  font: 400 clamp(4.5rem, min(22vh, 26vw), 15rem) / 1 var(--brush);
  letter-spacing: 0.14em;
  white-space: nowrap;
  writing-mode: vertical-rl;
}

/* 有 WebGL 時由粒子聚成標題；DOM 標題保留給讀屏與版面定位。
   WebGL 起不來或取樣失敗時才顯示 DOM 標題。 */
.js .hero__title {
  opacity: 0;
}

.no-gl .hero__title,
.no-title-gl .hero__title {
  opacity: 1;
  transition: opacity 0.9s ease 0.3s;
}

.hero__caption {
  margin-top: clamp(1.2rem, 4vh, 3rem);
  font: 400 0.84rem/1.9 var(--serif);
  letter-spacing: 0.52em;
  text-shadow:
    0 0 3px rgba(3, 9, 13, 0.95),
    0 1px 12px rgba(3, 9, 13, 0.9);
  writing-mode: vertical-rl;
}

.hero__caption span {
  display: block;
}

.hero__caption span + span {
  padding-top: 2.2em;
  color: var(--dim);
}

[lang="en"] .hero__caption {
  font: italic 500 0.95rem/1.7 var(--latin);
  letter-spacing: 0.08em;
}

.hero__copy {
  position: absolute;
  bottom: clamp(2.5rem, 9vh, 5.5rem);
  left: var(--gutter);
  display: grid;
  gap: 1.05rem;
  width: min(30rem, 100% - 2 * var(--gutter));
}

.hero__tagline {
  font: 600 clamp(1.35rem, 2.4vw, 1.9rem) / 1.5 var(--serif);
  letter-spacing: 0.16em;
}

html[lang="zh-Hant"] .hero__tagline {
  font-size: clamp(2rem, 3.4vw, 2.9rem);
  line-height: 1.3;
  letter-spacing: 0.1em;
  text-wrap: balance;
}

@media (min-width: 721px) {
  html[lang="zh-Hant"] .hero__tagline {
    white-space: nowrap;
  }
}

[lang="en"] .hero__tagline {
  font: 500 clamp(1.6rem, 2.8vw, 2.3rem) / 1.25 var(--latin);
  letter-spacing: 0;
}

.hero__lead {
  color: #c9d5d2;
  font-size: 0.94rem;
  line-height: 2.05;
}

.hero__copy {
  text-shadow:
    0 1px 2px rgba(0, 0, 0, 0.8),
    0 1px 16px rgba(0, 0, 0, 0.9);
}

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 2.4rem;
  margin-top: 0.3rem;
}

.cue {
  position: absolute;
  right: var(--gutter);
  bottom: clamp(2.5rem, 9vh, 5.5rem);
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--dim);
  font: italic 500 0.95rem/1 var(--latin);
  letter-spacing: 0.1em;
  writing-mode: vertical-rl;
}

.cue::after {
  content: "";
  width: 1px;
  height: 3.5rem;
  background: linear-gradient(var(--paper), transparent);
}

/* 進場順序：簾幕退場 → 開場運鏡（一筆成劍、雲散、題字）→ 小字依序浮現。
   --intro 是題字寫完的秒數，由 main.js 依 scene.js 的時間軸填入；沒有 WebGL 時是 0 */
.js .intro {
  opacity: 0;
}

.ready .intro {
  animation: rise 1.1s var(--ease) both;
  animation-delay: calc(var(--intro, 0s) + var(--after, 0s));
}

.ready .i2 {
  --after: -0.9s;
}
.ready .i3 {
  --after: -0.5s;
}
.ready .i4 {
  --after: -0.3s;
}
.ready .i5 {
  --after: -0.1s;
}
.ready .i6 {
  --after: 0.4s;
}

html.ready:not(.gl-on) .intro {
  animation-delay: 0.3s;
}

/* 主視覺的暗幕是墊在文字後面的；開場運鏡時文字還沒出來，暗幕跟著文字一起淡入 */
.gl-on .hero::before {
  opacity: 0;
}

.gl-on.ready .hero::before {
  animation: veil-in 1.6s ease both;
  animation-delay: calc(var(--intro, 0s) - 1.4s);
}

@keyframes veil-in {
  to {
    opacity: 1;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 720px) {
  .hero::before {
    background:
      linear-gradient(0deg, var(--ink) 4%, rgba(3, 9, 13, 0.72) 30%, transparent 58%);
  }

  .hero__mark {
    top: 5.6rem;
    transform: none;
  }

  .hero__caption {
    margin-top: 0.6rem;
  }

  .cue {
    display: none;
  }
}

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

.section {
  position: relative;
  padding-block: clamp(6rem, 15vw, 12rem);
}

/* 章節小標：序號＋名稱＋英文，後面拉一條線到底 */
.label {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: clamp(3rem, 7vw, 6rem);
  font: 500 0.8rem/1 var(--sans);
  letter-spacing: 0.36em;
}

.label b {
  color: var(--gold);
  font: 600 0.82rem/1 var(--serif);
  letter-spacing: 0;
}

.label i {
  color: var(--mute);
  font: italic 500 1.02rem/1 var(--latin);
  letter-spacing: 0.03em;
}

.label::after {
  content: "";
  flex: 1;
  height: 0.45rem;
  background: var(--paper);
  opacity: 0.3;
  -webkit-mask: url("/assets/img/stroke.webp") left center / 100% 100% no-repeat;
  mask: url("/assets/img/stroke.webp") left center / 100% 100% no-repeat;
}

[lang="en"] .label {
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

[lang="en"] .label i {
  text-transform: none;
}

.facts {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  font-size: 0.9rem;
  line-height: 1.8;
}

.facts dt,
.facts dd {
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.facts dt {
  padding-right: 2.2rem;
  color: var(--mute);
  letter-spacing: 0.24em;
  white-space: nowrap;
}

[lang="en"] .facts dt {
  letter-spacing: 0.06em;
}

/* 英文版的值是「原文＋換行＋英譯」 */
.facts dd[data-i18n] {
  white-space: pre-line;
}

.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 1s var(--ease) var(--d, 0s),
    transform 1s var(--ease) var(--d, 0s);
}

.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

.d1 {
  --d: 0.12s;
}
.d2 {
  --d: 0.24s;
}

/* ----------------------------------------------------------------- 緣起 */

.about__top {
  display: grid;
  align-items: end;
  gap: clamp(2rem, 5vw, 4rem);
}

/* 三行階梯式縮排的大字 */
.statement {
  display: grid;
  font: 500 clamp(2.7rem, 7vw, 6.4rem) / 1.24 var(--serif);
  letter-spacing: 0.04em;
}

.statement span:nth-child(2) {
  padding-left: 1.1em;
}

.statement span:nth-child(3) {
  padding-left: 2.2em;
}

[lang="en"] .statement {
  font: 500 clamp(2.6rem, 6.4vw, 5.8rem) / 1.08 var(--latin);
  letter-spacing: -0.01em;
}

[lang="en"] .statement span:nth-child(2) {
  padding-left: 0.6em;
}

[lang="en"] .statement span:nth-child(3) {
  padding-left: 1.2em;
}

.about__prose {
  display: grid;
  gap: 1.1rem;
  max-width: 30em;
  padding-bottom: 0.6rem;
  color: var(--dim);
  font-size: 0.95rem;
  line-height: 2.05;
}

/* 目錄式列表：一列一門功課，只用橫線分隔 */
.index {
  margin-top: clamp(4rem, 9vw, 8rem);
  border-top: 1px solid var(--line-strong);
}

.index__row {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding: clamp(1.4rem, 3vw, 2.3rem) 0;
  border-bottom: 1px solid var(--line);
}

.js .index__row.reveal {
  transition:
    opacity 1s var(--ease),
    transform 1s var(--ease),
    padding 0.5s var(--ease),
    background-color 0.5s ease;
}

.index__row:hover {
  padding-left: 1.1rem;
  background-color: rgba(237, 242, 239, 0.035);
}

.index__no {
  color: var(--gold);
  font: 500 0.82rem/1 var(--serif);
}

.index__name {
  font: 600 clamp(1.5rem, 3vw, 2.3rem) / 1.25 var(--serif);
  letter-spacing: 0.14em;
}

[lang="en"] .index__name {
  font: 500 clamp(1.7rem, 3.2vw, 2.6rem) / 1.15 var(--latin);
  letter-spacing: 0;
}

.index__desc {
  grid-column: 2;
  max-width: 34em;
  color: var(--dim);
  font-size: 0.95rem;
  line-height: 1.95;
}

.index__alt {
  display: none;
  color: var(--mute);
  font: italic 500 clamp(1.1rem, 1.8vw, 1.5rem) / 1 var(--latin);
  white-space: nowrap;
}

[lang="en"] .index__alt {
  font: 500 clamp(1rem, 1.5vw, 1.25rem) / 1 var(--serif);
  letter-spacing: 0.2em;
}

@media (min-width: 900px) {
  .about__top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .index__row {
    grid-template-columns: 3rem minmax(0, 15rem) minmax(0, 1fr) auto;
    gap: 2rem;
  }

  .index__desc {
    grid-column: auto;
  }

  .index__alt {
    display: block;
  }
}

/* ----------------------------------------------------------------- 九霄 */

/* 背後是世界觀畫作：左半壓暗給文字，右半留給漩渦與法陣 */
.world::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(3, 9, 13, 0.72), rgba(3, 9, 13, 0.3) 50%, transparent 74%);
  pointer-events: none;
  -webkit-mask-image: linear-gradient(transparent, #000 14%, #000 86%, transparent);
  mask-image: linear-gradient(transparent, #000 14%, #000 86%, transparent);
}

.world__grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: end;
  gap: clamp(1.5rem, 4vw, 4.5rem);
}

/* 作品名直排兩行，第二行往下錯開 */
.world__title {
  font: 600 clamp(3.4rem, 9vw, 8.2rem) / 1.14 var(--serif);
  letter-spacing: 0.08em;
  text-shadow: 0 6px 50px rgba(0, 0, 0, 0.65);
  writing-mode: vertical-rl;
}

.world__title span {
  display: block;
}

.world__title span + span {
  padding-top: 1.12em;
}

.world__copy {
  display: grid;
  grid-column: 1 / -1;
  gap: 0.95rem;
  max-width: 25rem;
}

.world__status {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--gold);
  font-size: 0.76rem;
  letter-spacing: 0.34em;
}

.world__status::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: currentColor;
}

[lang="en"] .world__status {
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.world__sub {
  font: 500 1.02rem/1.6 var(--serif);
  letter-spacing: 0.24em;
}

[lang="en"] .world__sub {
  letter-spacing: 0.06em;
}

.world__lead {
  color: #ced9d6;
  font-size: 0.95rem;
  line-height: 2.05;
  text-shadow: 0 1px 14px rgba(0, 0, 0, 0.9);
}

.world .facts {
  margin-top: 0.6rem;
}

.sigil {
  position: relative;
  justify-self: end;
  width: min(100%, 32rem);
  aspect-ratio: 1;
}

.sigil__fallback {
  width: 100%;
  height: 100%;
  color: #7fe0cb;
  opacity: 0.7;
  animation: spin 120s linear infinite;
}

/* WebGL 啟動後由粒子畫法陣 */
.gl-on .sigil__fallback {
  display: none;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.art-note {
  margin-top: clamp(2.5rem, 6vw, 5rem);
  color: var(--dim);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-align: right;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.9);
}

@media (min-width: 960px) {
  .world__grid {
    grid-template-columns: auto minmax(0, 24rem) minmax(0, 1fr);
  }

  .world__copy {
    grid-column: auto;
    padding-bottom: 0.5rem;
  }

  .sigil {
    align-self: center;
  }
}

@media (max-width: 959px) {
  .world::before {
    background: linear-gradient(180deg, transparent 30%, rgba(3, 9, 13, 0.7) 62%);
  }

  .world__grid {
    align-items: start;
  }

  .sigil {
    grid-row: 1;
    grid-column: 2;
    align-self: center;
  }

  .world__copy {
    grid-row: 2;
  }
}

/* ----------------------------------------------------------------- 玄燼 */

.chara__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.chara__lead {
  font: 500 clamp(1.7rem, 3.7vw, 3.1rem) / 1.5 var(--serif);
  letter-spacing: 0.08em;
  text-wrap: balance;
}

[lang="en"] .chara__lead {
  font: 500 clamp(1.9rem, 4vw, 3.4rem) / 1.15 var(--latin);
  letter-spacing: 0;
}

.chara__note {
  max-width: 30em;
  color: var(--dim);
  font-size: 0.95rem;
  line-height: 2.05;
}

/* MV 封面：外形是一塊筆刷刷出來的色塊，邊緣毛躁 */
.mv {
  position: relative;
}

.yt {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 0;
  cursor: pointer;
  -webkit-mask: url("/assets/img/mask-wide.webp") center / 109% 104% no-repeat;
  mask: url("/assets/img/mask-wide.webp") center / 109% 104% no-repeat;
}

.yt img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.6s var(--ease);
}

.mv:hover .yt img {
  transform: scale(1.04);
}

/* 播放器不套遮罩，控制列才按得到 */
.yt--frame {
  -webkit-mask: none;
  mask: none;
  cursor: auto;
}

/* 「播放」兩個字寫在封面左下角，壓出框外一點 */
.mv__play {
  position: absolute;
  bottom: -1.2rem;
  left: -0.3rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--paper);
  font-size: clamp(2rem, 3.6vw, 3.2rem);
  line-height: 1;
  letter-spacing: 0.08em;
  pointer-events: none;
  transition:
    color 0.25s ease,
    transform 0.5s var(--ease);
}

.mv__play svg {
  width: 0.5em;
  height: 0.5em;
  color: var(--gold-hi);
}

.mv:hover .mv__play {
  color: var(--gold-hi);
  transform: translateX(0.5rem);
}

.mv.is-playing .mv__play {
  display: none;
}

[lang="en"] .mv__play {
  font: italic 500 clamp(1.8rem, 3vw, 2.6rem) / 1 var(--latin);
  letter-spacing: 0;
}

/* 出現的方式是「被刷上去」：遮罩由左往右展開 */
.js .reveal .yt {
  -webkit-mask-position: 0% 50%;
  mask-position: 0% 50%;
  -webkit-mask-size: 0% 104%;
  mask-size: 0% 104%;
  transition:
    -webkit-mask-size 1.3s var(--ease) 0.15s,
    mask-size 1.3s var(--ease) 0.15s,
    -webkit-mask-position 1.3s var(--ease) 0.15s,
    mask-position 1.3s var(--ease) 0.15s;
}

.js .reveal.is-in .yt {
  -webkit-mask-position: 50% 50%;
  mask-position: 50% 50%;
  -webkit-mask-size: 109% 104%;
  mask-size: 109% 104%;
}

.mv__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 1.5rem;
  margin-top: 2.4rem;
}

.mv__title {
  font: 600 1rem/1.5 var(--serif);
  letter-spacing: 0.08em;
}

.mv__sub {
  color: var(--mute);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}

.poem {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  justify-self: start;
}

.poem__text {
  font: 500 clamp(1.1rem, 1.9vw, 1.42rem) / 2 var(--serif);
  letter-spacing: 0.34em;
  writing-mode: vertical-rl;
}

.poem__text p:last-child {
  color: var(--gold-hi);
}

.poem__cap {
  order: -1;
  color: var(--mute);
  font-size: 0.72rem;
  letter-spacing: 0.4em;
  writing-mode: vertical-rl;
}

[lang="en"] .poem__cap {
  font: italic 500 0.9rem/1 var(--latin);
  letter-spacing: 0.05em;
}

.poem__gloss {
  margin-bottom: 1.4rem;
  color: var(--dim);
  font: italic 500 1.12rem/1.6 var(--latin);
}

.poem__gloss:empty {
  display: none;
}

.chara__id {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  justify-self: start;
  writing-mode: vertical-rl;
}

.chara__kicker {
  color: var(--gold);
  font-size: 0.74rem;
  letter-spacing: 0.4em;
}

[lang="en"] .chara__kicker {
  font: italic 500 0.9rem/1 var(--latin);
  letter-spacing: 0.05em;
}

.chara__name {
  display: flex;
  align-items: center;
  gap: 0.35em;
  font: 600 clamp(4.2rem, 8vw, 7.4rem) / 1 var(--serif);
  letter-spacing: 0.1em;
}

.chara__name i {
  color: var(--mute);
  font: italic 500 1.05rem/1 var(--latin);
  letter-spacing: 0.08em;
}

.chara__facts {
  display: grid;
  justify-items: start;
  gap: 0.8rem;
}

.chara__facts .facts {
  width: 100%;
}

/* 窄螢幕：詩與名字並排掛著 */
@media (max-width: 999px) {
  .chara__grid {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .chara__lead,
  .chara__note,
  .chara__mv,
  .chara__facts {
    grid-column: 1 / -1;
  }

  .chara__id {
    grid-column: 1;
    grid-row: 4;
  }

  .poem {
    grid-column: 2;
    grid-row: 4;
    justify-self: end;
  }
}

/* 寬螢幕：左八欄放 MV，右邊像掛軸一樣垂下名字與詩 */
@media (min-width: 1000px) {
  .chara__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: clamp(1rem, 2vw, 2rem);
    row-gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .chara__lead {
    grid-column: 1 / span 7;
  }

  .chara__note {
    grid-column: 9 / -1;
    align-self: end;
  }

  .chara__mv {
    grid-row: 2 / span 2;
    grid-column: 1 / span 8;
  }

  .poem {
    grid-row: 2;
    grid-column: 9 / span 3;
    justify-self: end;
  }

  .chara__id {
    grid-row: 2;
    grid-column: 12;
    justify-self: end;
  }

  .chara__facts {
    grid-row: 3;
    grid-column: 9 / -1;
    align-self: end;
  }
}

/* ----------------------------------------------------------------- 作品 */

.show {
  display: grid;
  align-items: end;
  gap: clamp(2.5rem, 5vw, 4.5rem);
}

/* 實際遊戲畫面：桌機一張、手機一張疊在右下角，畫面完整不裁切；
   後面墊一塊刷上去的絳紅（遊戲的主色），畫面像是擺在顏料上 */
.show__shots {
  position: relative;
  display: block;
  padding: clamp(1.2rem, 3.4vw, 3rem) clamp(2.2rem, 9vw, 8rem) clamp(3rem, 7vw, 5.5rem) clamp(1rem, 2.6vw, 2.2rem);
  cursor: pointer;
}

.show__shots::before {
  content: "";
  position: absolute;
  inset: 0 clamp(0.5rem, 3.5vw, 3.5rem) clamp(1.4rem, 3.5vw, 3rem) 0;
  background: #6f1d24;
  -webkit-mask: url("/assets/img/mask-wide.webp") left center / 100% 100% no-repeat;
  mask: url("/assets/img/mask-wide.webp") left center / 100% 100% no-repeat;
}

.js .show__shots.reveal::before {
  -webkit-mask-size: 0% 100%;
  mask-size: 0% 100%;
  transition:
    -webkit-mask-size 1.2s var(--ease),
    mask-size 1.2s var(--ease);
}

.js .show__shots.reveal.is-in::before {
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
}

.shot {
  position: relative;
  display: block;
  overflow: hidden;
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 1.6s var(--ease);
}

/* 手機畫面外面留一圈暗邊，跟桌機畫面分開 */
.shot--phone {
  position: absolute;
  right: 0;
  bottom: 0;
  width: clamp(6.5rem, 21%, 13.5rem);
  border: clamp(4px, 0.5vw, 7px) solid var(--ink-deep);
}

.show__shots:hover .shot img {
  transform: scale(1.025);
}

.show__note {
  position: absolute;
  bottom: 0;
  left: 0;
  color: var(--mute);
  font-size: 0.76rem;
  letter-spacing: 0.3em;
}

[lang="en"] .show__note {
  letter-spacing: 0.1em;
}

.show__info {
  display: grid;
  justify-items: start;
  gap: 1.1rem;
}

.show__title {
  display: grid;
  gap: 0.7rem;
  font-size: clamp(2.8rem, 6vw, 5rem);
  line-height: 1.1;
  letter-spacing: 0.08em;
}

.show__title i {
  color: var(--mute);
  font: italic 500 clamp(1.1rem, 1.8vw, 1.5rem) / 1 var(--latin);
  letter-spacing: 0.03em;
}

.show__lead {
  color: var(--dim);
  font-size: 1.05rem;
  line-height: 1.9;
}

[lang="en"] .show__lead {
  font: italic 500 1.3rem/1.5 var(--latin);
}

.show .facts {
  width: 100%;
}

@media (min-width: 1000px) {
  .show {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
}

/* ----------------------------------------------------------------- 聯絡 */

.contact {
  padding-bottom: clamp(8rem, 18vw, 14rem);
}

/* 背後是浮島畫作：左下壓暗給信箱 */
.contact::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(3, 9, 13, 0.84), rgba(3, 9, 13, 0.5) 36%, transparent 60%),
    linear-gradient(270deg, rgba(3, 9, 13, 0.5), transparent 36%);
  pointer-events: none;
  -webkit-mask-image: linear-gradient(transparent, #000 18%);
  mask-image: linear-gradient(transparent, #000 18%);
}

.contact__grid {
  display: grid;
  align-items: end;
  gap: clamp(2.5rem, 6vw, 5rem);
}

/* 直排兩行：HTML 裡用換行字元分開 */
.contact__headline {
  white-space: pre-line;
  justify-self: end;
  font: 600 clamp(2.4rem, 6vw, 5.2rem) / 1.3 var(--serif);
  letter-spacing: 0.08em;
  text-shadow: 0 6px 50px rgba(0, 0, 0, 0.6);
  writing-mode: vertical-rl;
}

[lang="en"] .contact__headline {
  justify-self: start;
  font: 500 clamp(3rem, 8vw, 7rem) / 1 var(--latin);
  letter-spacing: -0.01em;
  writing-mode: horizontal-tb;
}

.contact__body {
  display: grid;
  justify-items: start;
  gap: 1.5rem;
  text-shadow:
    0 1px 2px rgba(0, 0, 0, 0.8),
    0 1px 16px rgba(0, 0, 0, 0.9);
}

.contact__lead {
  max-width: 26em;
  color: var(--dim);
  font-size: 0.95rem;
  line-height: 2.05;
}

.contact__mail {
  max-width: 100%;
  padding-bottom: 0.4rem;
  background: linear-gradient(currentColor, currentColor) 0 100% / 100% 1px no-repeat;
  font: 500 clamp(1.4rem, 4.4vw, 3.5rem) / 1.2 var(--latin);
  letter-spacing: 0.01em;
  overflow-wrap: anywhere;
  transition: color 0.25s ease;
}

.contact__mail:hover {
  color: var(--gold-hi);
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 2.2rem;
  color: var(--dim);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
}

@media (min-width: 900px) {
  .contact__grid {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .contact__headline {
    order: 2;
  }
}

/* ----------------------------------------------------------------- 牌記 */

.colophon {
  padding-block: 2.5rem 3rem;
  border-top: 1px solid var(--line);
  background: rgba(3, 9, 13, 0.9);
  color: var(--mute);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.colophon__in {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem 2.5rem;
}

/* 雙線方框裡直排三行：歲次、堂號、製 */
.colophon__box {
  margin-right: auto;
  padding: 0.7rem 0.5rem;
  border: 1px solid var(--line-strong);
  outline: 1px solid var(--line-strong);
  outline-offset: 3px;
  color: var(--paper);
  font: 500 0.8rem/1.7 var(--serif);
  letter-spacing: 0.42em;
  writing-mode: vertical-rl;
}

.colophon__box > span {
  display: block;
}

.colophon__note {
  letter-spacing: 0.16em;
}

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

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

  .js .reveal {
    transform: none;
  }
}

/* ------------------------------------------------------------------- 404 */

.lost {
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 1.4rem;
  min-height: 100vh;
  min-height: 100svh;
  padding: var(--gutter);
  text-align: center;
}

.lost__code {
  color: var(--mute);
  font: italic 500 1.1rem/1 var(--latin);
  letter-spacing: 0.08em;
}

.lost__title {
  font: 600 clamp(2.4rem, 8vw, 4.6rem) / 1.2 var(--serif);
  letter-spacing: 0.14em;
}

.lost__lead {
  color: var(--dim);
  font-size: 0.95rem;
}