/* ==========================================================================
   艺术层（Art Layer）
   —— 只作用于 studio 站；把 HTML 里的 art.css 这一行链接删掉，即回到简洁版
   —— 依赖：style.css（基础层）+ studio.css（深色主题层），必须排在这两者之后
   —— 全部为渐进增强：动效失败或减弱动效时，页面按静态版正常呈现
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 胶片颗粒
   极淡的噪点覆盖全站，让大面积炭黑不再"平"，带上印刷品的颗粒感
   -------------------------------------------------------------------------- */
.art-grain {
  position: fixed;
  inset: -60px;
  z-index: 9000;
  pointer-events: none;
  opacity: 0.11;
  mix-blend-mode: overlay;
  background-repeat: repeat;
  background-size: 220px 220px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: art-grain 7s steps(7) infinite;
  will-change: transform;
}

@keyframes art-grain {
  0%   { transform: translate3d(0, 0, 0); }
  25%  { transform: translate3d(-14px, 8px, 0); }
  50%  { transform: translate3d(10px, -12px, 0); }
  75%  { transform: translate3d(-8px, -6px, 0); }
  100% { transform: translate3d(0, 0, 0); }
}

/* --------------------------------------------------------------------------
   2. 阅读进度
   顶部一条 2px 古铜进度，随滚动生长
   -------------------------------------------------------------------------- */
.art-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 9600;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--accent), rgba(199, 154, 99, 0.18));
}

/* --------------------------------------------------------------------------
   3. 铜环光标
   跟随鼠标的古铜细环，进入作品卡时张开并浮出 VIEW
   -------------------------------------------------------------------------- */
.art-cursor {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9500;
  width: 34px;
  height: 34px;
  margin: -17px 0 0 -17px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  display: grid;
  place-items: center;
  transition: opacity 0.4s var(--ease), width 0.4s var(--ease),
              height 0.4s var(--ease), margin 0.4s var(--ease),
              background 0.4s var(--ease);
  will-change: transform;
}

.art-cursor.is-on {
  opacity: 0.72;
}

.art-cursor.is-big {
  width: 82px;
  height: 82px;
  margin: -41px 0 0 -41px;
  background: rgba(199, 154, 99, 0.09);
}

.art-cursor__label {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0;
  transform: scale(0.85);
  transition: opacity 0.3s var(--ease), transform 0.4s var(--ease);
}

.art-cursor.has-label .art-cursor__label {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   4. 首屏入场
   双扇幕布上下分离 + 计数，只在首页、每个会话一次
   -------------------------------------------------------------------------- */
html.art-hold,
html.art-hold body {
  overflow: hidden;
}

html.art-hold .reveal {
  opacity: 0;
  transform: translateY(18px);
}

.art-intro {
  position: fixed;
  inset: 0;
  z-index: 9800;
  pointer-events: none;
}

.art-intro__panel {
  position: absolute;
  left: 0;
  width: 100%;
  height: 50.5%;
  background: var(--bg);
  transition: transform 1.05s cubic-bezier(0.72, 0, 0.24, 1);
  will-change: transform;
}

.art-intro__panel--top {
  top: 0;
}

.art-intro__panel--bottom {
  bottom: 0;
}

.art-intro.is-done .art-intro__panel--top {
  transform: translateY(-100%);
}

.art-intro.is-done .art-intro__panel--bottom {
  transform: translateY(100%);
}

.art-intro__inner {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  text-align: center;
  transition: opacity 0.5s var(--ease), transform 0.7s var(--ease);
}

.art-intro.is-done .art-intro__inner {
  opacity: 0;
  transform: translateY(-14px);
}

.art-intro__name {
  font-family: var(--font-serif);
  font-size: clamp(0.95rem, 2.2vw, 1.5rem);
  letter-spacing: 0.34em;
  text-transform: uppercase;
  text-indent: 0.34em;
  color: var(--ink);
  margin: 0;
}

.art-intro__sub {
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.art-intro__count {
  position: absolute;
  right: 40px;
  bottom: 34px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--accent);
  transition: opacity 0.4s var(--ease);
}

.art-intro.is-done .art-intro__count {
  opacity: 0;
}

/* --------------------------------------------------------------------------
   5. 标题遮罩升起
   大标题按行从下往上推入，行与行错开
   -------------------------------------------------------------------------- */
.art-lines .art-line {
  display: block;
  overflow: hidden;
  padding-bottom: 0.12em;
  margin-bottom: -0.12em;
}

.art-lines .art-line > span {
  display: block;
  transform: translateY(118%);
  transition: transform 1.1s cubic-bezier(0.22, 0.61, 0.24, 1);
}

.art-lines.art-in .art-line > span {
  transform: none;
}

/* --------------------------------------------------------------------------
   6. 大图揭幕 + 缓慢视差
   -------------------------------------------------------------------------- */
/* 注意：状态类名用 .art-in 而非 .is-in
   —— .is-in 已被基础层的 .reveal 占用，复用会导致揭幕状态被提前触发 */
.art-media {
  clip-path: inset(0 0 100% 0);
  transition: clip-path 1.5s cubic-bezier(0.22, 0.61, 0.24, 1);
  will-change: clip-path;
}

.art-media.art-in {
  clip-path: inset(0 0 0 0);
}

img.art-parallax {
  will-change: transform;
}

/* --------------------------------------------------------------------------
   7. 作品卡：悬停时内描一层古铜细框（画廊挂画的做法）
   -------------------------------------------------------------------------- */
.work-card .work-thumb::after {
  content: "";
  position: absolute;
  inset: 12px;
  z-index: 2;
  pointer-events: none;
  border: 1px solid var(--accent);
  opacity: 0;
  transform: scale(0.97);
  transition: opacity 0.5s var(--ease), transform 0.65s var(--ease);
}

.work-card:hover .work-thumb::after {
  opacity: 0.5;
  transform: none;
}

/* 悬停时图片略微降饱和，把注意力让给元信息 */
.work-card .work-thumb .fill {
  transition: transform 0.9s var(--ease), filter 0.6s var(--ease);
}

.work-card:hover .work-thumb .fill {
  filter: saturate(0.9) brightness(1.04);
}

/* --------------------------------------------------------------------------
   8. 动态字样带
   英文实心 / 空心交替，缓慢横移，悬停暂停
   -------------------------------------------------------------------------- */
.art-marquee {
  position: relative;
  overflow: hidden;
  padding: var(--s-4) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent);
}

.art-marquee__track {
  display: flex;
  width: max-content;
  animation: art-marquee 42s linear infinite;
  will-change: transform;
}

.art-marquee:hover .art-marquee__track {
  animation-play-state: paused;
}

.art-marquee__group {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.art-marquee__item {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4.6vw, 3.1rem);
  line-height: 1;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  padding: 0 0.28em;
  color: var(--ink);
}

.art-marquee__item.is-outline {
  color: transparent;
  -webkit-text-stroke: 1px rgba(242, 239, 233, 0.32);
}

.art-marquee__dot {
  font-size: 0.42em;
  color: var(--accent);
  margin: 0 0.5em;
  transform: translateY(-0.1em);
}

@keyframes art-marquee {
  to { transform: translateX(-50%); }
}

/* --------------------------------------------------------------------------
   9. 首屏竖排标尺
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
}

.art-rail {
  position: absolute;
  right: 28px;
  top: clamp(96px, 15vw, 170px);
  writing-mode: vertical-rl;
  font-size: 10px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--faint);
  pointer-events: none;
}

.art-rail::after {
  content: "";
  display: block;
  width: 1px;
  height: 76px;
  margin: 0.9em auto 0;
  background: linear-gradient(180deg, var(--line-strong), transparent);
}

@media (max-width: 1080px) {
  .art-rail { display: none; }
}

/* --------------------------------------------------------------------------
   10. 页脚巨型签名
   空心描边字标，底部被裁掉一截，作为整站的收笔
   -------------------------------------------------------------------------- */
.site-footer {
  overflow: hidden;
}

.art-signature {
  font-family: var(--font-serif);
  font-size: clamp(2.6rem, 12.4vw, 12rem);
  line-height: 0.78;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  white-space: nowrap;
  color: transparent;
  -webkit-text-stroke: 1px rgba(242, 239, 233, 0.14);
  margin: var(--s-5) 0 -0.14em;
  user-select: none;
  pointer-events: none;
  transition: -webkit-text-stroke-color 0.8s var(--ease);
}

.site-footer:hover .art-signature {
  -webkit-text-stroke: 1px rgba(199, 154, 99, 0.42);
}

/* --------------------------------------------------------------------------
   11. 磁吸按钮
   -------------------------------------------------------------------------- */
.art-magnet {
  transition: transform 0.45s cubic-bezier(0.22, 0.61, 0.24, 1);
  will-change: transform;
}

/* --------------------------------------------------------------------------
   12. 降级：触屏、小屏、减弱动效
   -------------------------------------------------------------------------- */
@media (hover: none), (pointer: coarse), (max-width: 900px) {
  .art-cursor { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .art-grain,
  .art-marquee__track {
    animation: none;
  }

  .art-cursor,
  .art-progress {
    display: none;
  }

  .art-media,
  .art-lines .art-line > span,
  html.art-hold .reveal {
    clip-path: none;
    transform: none;
    opacity: 1;
    transition: none;
  }
}