/* ============ ACT® — 生成艺术实验场 ============ */

:root {
  --bg: #08080d;
  --fg: #e8e6e3;
  --dim: #8a8894;
  --line: rgba(232, 230, 227, 0.12);
  --pad: clamp(16px, 4vw, 56px);
  --font: "Archivo", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --serif: "Noto Serif SC", "Songti SC", serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.has-cursor, body.has-cursor a, body.has-cursor button { cursor: none; }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; color: inherit; background: none; border: none; }
canvas { display: block; }

::selection { background: var(--fg); color: var(--bg); }

/* ---------- 全局星空背景 ---------- */
.bg-canvas {
  position: fixed; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
main, .footer { position: relative; z-index: 1; }

/* ---------- 颗粒质感 ---------- */
.grain {
  position: fixed; inset: -50%;
  width: 200%; height: 200%;
  pointer-events: none; z-index: 200;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 8s steps(10) infinite;
}
@keyframes grain {
  0%,100% { transform: translate(0,0); }
  20% { transform: translate(-3%,2%); }
  40% { transform: translate(2%,-3%); }
  60% { transform: translate(-2%,-2%); }
  80% { transform: translate(3%,3%); }
}

/* ---------- 自定义光标 ---------- */
.cursor {
  position: fixed; top: 0; left: 0; z-index: 500;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--fg);
  border: 1.5px solid transparent;
  pointer-events: none;
  display: none;
  align-items: center; justify-content: center;
  transition: width .25s, height .25s, background .25s;
}
body.has-cursor .cursor { display: flex; }
.cursor.is-open { width: 56px; height: 56px; }
.cursor.is-mini {
  width: 26px; height: 26px;
  background: transparent;
  border: 1.5px solid var(--fg);
}
.cursor__label {
  font-size: 11px; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--bg);
  opacity: 0; transition: opacity .2s;
}
.cursor.is-open .cursor__label { opacity: 1; }

/* ---------- 头部 ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px var(--pad);
  mix-blend-mode: difference;
  font-size: 13px; font-weight: 500; letter-spacing: .05em;
  pointer-events: none; /* 整条 header 不拦截点击，避免盖住吸顶筛选条 */
}
.header__logo { font-weight: 900; font-size: 20px; letter-spacing: .02em; pointer-events: auto; }
.header__logo span { font-size: 10px; vertical-align: super; }
.header__meta { font-variant-numeric: tabular-nums; opacity: .55; letter-spacing: .15em; }
.header__meta::before {
  content: ""; display: inline-block; width: 6px; height: 6px;
  border-radius: 50%; background: #6f6; margin-right: 8px;
  animation: blink 2s infinite;
}
@keyframes blink { 50% { opacity: .2; } }
@media (max-width: 640px) { .header__meta { display: none; } }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  height: 100vh; height: 100svh;
  overflow: hidden;
}
.hero__inner {
  position: relative; z-index: 2;
  height: 100%;
  display: flex; flex-direction: column;
  justify-content: center;
  padding: 0 var(--pad);
  pointer-events: none;
}
.hero__title {
  display: flex;
  font-size: clamp(120px, 30vw, 480px);
  font-weight: 900;
  line-height: .82;
  letter-spacing: -.02em;
  text-transform: uppercase;
  mix-blend-mode: difference;
}
.hero__title .line { display: block; overflow: hidden; }
.hero__title .line > span {
  display: inline-block;
  transform: translateY(110%);
  animation: rise 1.1s cubic-bezier(.16,1,.3,1) forwards;
}
.hero__title .line:nth-child(2) > span { animation-delay: .1s; }
.hero__title .line:nth-child(3) > span { animation-delay: .2s; }
@keyframes rise { to { transform: translateY(0); } }

.hero__sub {
  margin-top: 3vh;
  font-family: var(--serif);
  font-size: clamp(15px, 1.8vw, 22px);
  line-height: 1.7;
  color: var(--fg);
}
.hero__sub em {
  display: block; margin-top: 6px;
  font-family: var(--font); font-style: normal;
  font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--dim);
}
.hero__hint {
  position: absolute; bottom: 24px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  font-size: 11px; letter-spacing: .3em; text-transform: uppercase;
  color: var(--dim);
  animation: hint 2.4s ease-in-out infinite;
}
@keyframes hint { 50% { transform: translateX(-50%) translateY(8px); opacity: .4; } }

/* ---------- 简介 ---------- */
.about { padding: 12vw var(--pad); }
.about__text {
  max-width: 900px;
  font-family: var(--serif);
  font-size: clamp(20px, 3vw, 36px);
  line-height: 1.8;
}
.about__text span {
  display: block; margin-top: 1.5em;
  font-family: var(--font);
  font-size: 12px; letter-spacing: .25em; text-transform: uppercase;
  color: var(--dim);
}

/* ---------- 筛选 ---------- */
.filters {
  display: flex; gap: 10px; flex-wrap: wrap;
  padding: 20px var(--pad);
  position: sticky; top: 0; z-index: 50;
  background: rgba(8,8,13,.55);
  backdrop-filter: blur(12px);
}
.filters button {
  font-size: 13px; font-weight: 700; letter-spacing: .1em;
  padding: 9px 20px;
  border: 1px solid var(--line); border-radius: 99px;
  color: var(--dim);
  transition: color .3s, background .3s, border-color .3s;
}
.filters button:hover { color: var(--fg); }
.filters button.is-on { background: var(--fg); color: var(--bg); border-color: var(--fg); }

/* ---------- 作品网格 ---------- */
.grid__inner {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 24px;
  padding: 6vw var(--pad) 2vw;
}
.tile { position: relative; margin-bottom: 8vw; }
.tile:nth-child(odd)  { grid-column: 1 / span 7; }
.tile:nth-child(even) { grid-column: 8 / span 5; margin-top: 10vw; }
.tile:nth-child(4n+2) { grid-column: 7 / span 6; }
.tile:nth-child(4n+4) { grid-column: 3 / span 6; margin-top: 2vw; }

.tile__media {
  position: relative;
  aspect-ratio: 16 / 10;
}
.tile:nth-child(even) .tile__media { aspect-ratio: 4 / 4.4; }
.tile__media canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  /* 柔边遮罩：视觉边缘羽化，融进星空背景，不再有"方框" */
  -webkit-mask-image: radial-gradient(ellipse 72% 72% at 50% 50%, #000 52%, transparent 74%);
          mask-image: radial-gradient(ellipse 72% 72% at 50% 50%, #000 52%, transparent 74%);
}

.tile__num, .tile__tag {
  position: absolute; top: 4px; z-index: 2;
  font-size: 11px; font-weight: 700; letter-spacing: .15em;
  pointer-events: none;
}
.tile__num { left: 8px; opacity: .75; }
.tile__tag {
  right: 8px; text-transform: uppercase;
  color: var(--dim);
}

.tile__info {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px;
  padding-top: 10px;
}
.tile__name {
  font-size: clamp(20px, 2.4vw, 36px);
  font-weight: 800; letter-spacing: -.01em; line-height: 1.1;
}
.tile__name em {
  font-family: var(--serif); font-style: normal; font-weight: 400;
  font-size: .55em; color: var(--dim); margin-left: 10px;
}
.tile__name span { display: inline-block; transition: transform .5s cubic-bezier(.16,1,.3,1); }
.tile:hover .tile__name span { transform: translateX(10px); }
.tile__meta { font-size: 11px; letter-spacing: .12em; color: var(--dim); white-space: nowrap; }

/* 滚动淡入 */
.tile { opacity: 0; transform: translateY(50px); }
.tile.is-in { opacity: 1; transform: none; transition: opacity .9s ease, transform .9s cubic-bezier(.16,1,.3,1); }

@media (max-width: 720px) {
  .tile, .tile:nth-child(odd), .tile:nth-child(even),
  .tile:nth-child(4n+2), .tile:nth-child(4n+4) {
    grid-column: 1 / -1; margin-top: 0;
  }
  .tile:nth-child(even) .tile__media { aspect-ratio: 16 / 11; }
}

/* ---------- 页脚 ---------- */
.footer {
  display: flex; justify-content: space-between; gap: 16px;
  padding: 24px var(--pad) 32px;
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--dim);
}
.footer a:hover { color: var(--fg); }
@media (max-width: 640px) { .footer__mid { display: none; } }

/* ---------- 全屏作品视图 ---------- */
.stage {
  position: fixed; inset: 0; z-index: 400;
  background: var(--bg);
  visibility: hidden; opacity: 0;
  transition: opacity .5s ease, visibility 0s .5s;
}
.stage.is-open { visibility: visible; opacity: 1; transition: opacity .5s ease; }
.stage__canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.stage__close {
  position: absolute; top: 24px; right: var(--pad); z-index: 2;
  font-size: 13px; font-weight: 700; letter-spacing: .15em;
  padding: 12px 22px;
  border: 1px solid var(--line); border-radius: 99px;
  background: rgba(8,8,13,.5);
  backdrop-filter: blur(8px);
  transition: background .3s, color .3s;
}
.stage__close:hover { background: var(--fg); color: var(--bg); }
.stage__info {
  position: absolute; left: var(--pad); bottom: 6vh; z-index: 2;
  pointer-events: none;
}
.stage__name { font-size: clamp(36px, 7vw, 110px); font-weight: 900; line-height: 1; letter-spacing: -.02em; }
.stage__meta { margin-top: 12px; font-size: 12px; letter-spacing: .2em; text-transform: uppercase; color: var(--dim); }
.stage__desc { margin-top: 16px; max-width: 420px; font-family: var(--serif); font-size: 15px; line-height: 1.9; color: var(--fg); opacity: .85; }