/* Pixelz — darkroom / silver-gelatin print gallery
   近黑暗房底 + 高对比衬线标题 + 等宽元信息 + 唯一安全灯红 #d34a3a
   无圆角、无卡片、无投影；图像默认银盐灰调，触及时回到彩色 */

:root {
  --soot: #0c0c0c;        /* 暗房底 */
  --tray: #141414;        /* 显影盘（面板） */
  --silver: #ececec;      /* 印相纸正文 */
  --halide: #8a8a8a;      /* 弱化 */
  --safelight: #d34a3a;   /* 安全灯红（唯一点缀） */
  --hairline: #242424;    /* 细灰线 */

  --face-title: "Playfair Display", "Didot", Georgia, "Times New Roman", serif;
  --face-body: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --face-meta: "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  --measure: 1120px;
  --emulsion: .55s cubic-bezier(.2, .6, .2, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--soot);
  color: var(--silver);
  font-family: var(--face-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--face-title); font-weight: 400; }
img { background: #101010; }
a { color: var(--silver); text-decoration: none; }
a:hover { color: var(--safelight); }
::selection { background: var(--safelight); color: #0c0c0c; }

/* 通用横向容器 */
.plate { max-width: var(--measure); margin: 0 auto; padding: 0 28px; }

.meta {
  font-family: var(--face-meta);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--halide);
}

/* ---------- 眉标 ---------- */
.masthead {
  position: sticky; top: 0; z-index: 20;
  background: var(--soot);
  border-bottom: 1px solid var(--hairline);
}
.masthead__row { display: flex; align-items: baseline; gap: 30px; height: 74px; }
.wordmark { font-family: var(--face-title); font-size: 1.45rem; letter-spacing: .04em; color: var(--silver); }
.wordmark i { font-style: normal; color: var(--safelight); }
.masthead__nav { display: flex; gap: 26px; margin-left: auto; }
.masthead__nav a {
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .18em;
  text-transform: uppercase; color: var(--halide);
  padding-bottom: 3px; border-bottom: 1px solid transparent;
  transition: color var(--emulsion), border-color var(--emulsion);
}
.masthead__nav a:hover { color: var(--silver); border-bottom-color: var(--safelight); }
.tongue {
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .18em;
  text-transform: uppercase; color: var(--halide);
  border-bottom: 1px solid var(--hairline); padding-bottom: 3px;
  transition: color var(--emulsion), border-color var(--emulsion);
}
.tongue:hover { color: var(--safelight); border-bottom-color: var(--safelight); }

/* ---------- 开篇 ---------- */
.overture { padding: 116px 0 96px; border-bottom: 1px solid var(--hairline); }
.overture__kicker {
  font-family: var(--face-meta); font-size: .72rem; letter-spacing: .3em;
  text-transform: uppercase; color: var(--safelight); margin: 0 0 30px;
}
.overture h1 {
  font-size: clamp(2.5rem, 6.4vw, 4.5rem); line-height: 1.03;
  letter-spacing: -.025em; margin: 0 0 30px; max-width: 17ch;
}
.overture__sub { color: var(--halide); max-width: 54ch; margin: 0 0 36px; font-size: 1.02rem; }
.overture__go {
  font-family: var(--face-meta); font-size: .74rem; letter-spacing: .2em;
  text-transform: uppercase; color: var(--silver);
  border-bottom: 1px solid var(--safelight); padding-bottom: 5px;
  transition: color var(--emulsion);
}
.overture__go:hover { color: var(--safelight); }

/* ---------- 段落带 ---------- */
.band { padding: 78px 0; border-bottom: 1px solid var(--hairline); }
.band--last { border-bottom: 0; }
.band__label {
  font-family: var(--face-meta); font-size: .72rem; letter-spacing: .28em;
  text-transform: uppercase; color: var(--halide); margin: 0 0 36px;
}
.band__label::after { content: ""; display: block; width: 34px; height: 1px; background: var(--safelight); margin-top: 12px; }

/* ---------- 主题索引（非 chips） ---------- */
.index { border-top: 1px solid var(--hairline); }
.index__row {
  display: flex; align-items: baseline; gap: 22px;
  padding: 17px 2px; border-bottom: 1px solid var(--hairline);
}
.index__code {
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--safelight); min-width: 58px;
}
.index__name { font-family: var(--face-title); font-size: 1.3rem; color: var(--silver); transition: color var(--emulsion); }
.index__row:hover .index__name { color: var(--safelight); }

/* ---------- 筛选（非胶囊） ---------- */
.sieve { display: flex; flex-wrap: wrap; gap: 4px 30px; margin: 0 0 52px; padding-bottom: 14px; border-bottom: 1px solid var(--hairline); }
.sieve a {
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--halide); padding-bottom: 3px;
  border-bottom: 1px solid transparent; transition: color var(--emulsion), border-color var(--emulsion);
}
.sieve a:hover { color: var(--silver); }
.sieve a.is-current { color: var(--safelight); border-bottom-color: var(--safelight); }

/* ---------- 图版（替代卡片：大图 + 细灰线 + 图下说明） ---------- */
.frames { display: grid; grid-template-columns: repeat(3, 1fr); gap: 52px 34px; }
.frame { display: block; color: inherit; }
.frame__img {
  display: block; width: 100%; height: auto;
  filter: grayscale(100%);
  transition: filter var(--emulsion);
}
.frame:hover .frame__img { filter: grayscale(0); }
.frame__rule { height: 1px; background: var(--hairline); margin: 15px 0 13px; }
.frame__meta {
  font-family: var(--face-meta); font-size: .68rem; letter-spacing: .18em;
  text-transform: uppercase; color: var(--halide); margin: 0 0 9px;
}
.frame__meta b { font-weight: 400; color: var(--safelight); }
.frame__title { font-size: 1.16rem; line-height: 1.35; margin: 0 0 9px; color: var(--silver); }
.frame:hover .frame__title { color: var(--safelight); }
.frame__line { margin: 0; color: var(--halide); font-size: .91rem; line-height: 1.6; }

/* ---------- 开篇页 / 列表页头 ---------- */
.lede { padding: 74px 0 46px; }
.lede h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); line-height: 1.08; letter-spacing: -.02em; margin: 0 0 20px; }
.lede__note { color: var(--halide); max-width: 62ch; margin: 0; }

/* ---------- 教程详页 ---------- */
.entry { padding: 66px 0 88px; }
.entry__plate { max-width: 880px; }
.entry__kicker {
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .24em;
  text-transform: uppercase; color: var(--safelight); margin: 0 0 22px;
}
.entry__back {
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--halide); display: inline-block; margin-bottom: 26px;
  transition: color var(--emulsion);
}
.entry__back:hover { color: var(--safelight); }
.entry__title { font-size: clamp(2rem, 4.8vw, 3.2rem); line-height: 1.1; letter-spacing: -.02em; margin: 0 0 22px; }
.entry__intro { font-family: var(--face-title); font-size: 1.32rem; line-height: 1.55; color: var(--halide); margin: 0 0 54px; }

/* 图序（contact sheet） */
.plates { margin: 0 0 58px; }
.plates__label {
  font-family: var(--face-meta); font-size: .72rem; letter-spacing: .28em;
  text-transform: uppercase; color: var(--halide); margin: 0 0 32px;
}
.plates__label::after { content: ""; display: block; width: 34px; height: 1px; background: var(--safelight); margin-top: 12px; }
.plate-fig { margin: 0 0 52px; }
.plate-fig img { display: block; width: 100%; height: auto; filter: grayscale(100%); transition: filter var(--emulsion); }
.plate-fig:hover img { filter: grayscale(0); }
.plate-fig figcaption {
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
  margin-top: 14px; padding-top: 13px; border-top: 1px solid var(--hairline);
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--halide);
}
.plate-fig figcaption b { font-weight: 400; color: var(--safelight); }

.entry__body p { margin: 0 0 22px; font-size: 1.03rem; }
.entry__body p:first-of-type { font-size: 1.14rem; color: #d8d8d8; }

/* 深度小节 */
.deep { margin-top: 52px; padding-top: 26px; border-top: 1px solid var(--hairline); }
.deep__head { font-size: 1.42rem; line-height: 1.28; margin: 0 0 20px; }
.deep__head::before {
  content: ""; display: inline-block; width: 12px; height: 1px;
  background: var(--safelight); vertical-align: middle; margin-right: 14px;
  transform: translateY(-4px);
}
.deep__body p { margin: 0 0 20px; font-size: 1.02rem; }
.deep__body p:last-child { margin-bottom: 0; }

/* 常见问题 */
.qw { margin-top: 64px; padding-top: 30px; border-top: 1px solid var(--hairline); }
.qw h2 { font-size: 1.28rem; margin: 0 0 24px; }
.qw__list { margin: 0; }
.qw__list dt {
  font-family: var(--face-title); font-size: 1.12rem; line-height: 1.4;
  padding-top: 20px; margin-top: 20px; border-top: 1px solid var(--hairline);
}
.qw__list dt:first-of-type { border-top: 0; margin-top: 0; padding-top: 0; }
.qw__list dd { margin: 10px 0 0; font-size: 1rem; color: var(--halide); }
.qw__list dd p { margin: 0 0 12px; }
.qw__list dd p:last-child { margin-bottom: 0; }

/* 要点 */
.notes { margin-top: 62px; padding-top: 30px; border-top: 1px solid var(--hairline); }
.notes h2 { font-size: 1.28rem; margin: 0 0 20px; }
.notes ol { list-style: none; margin: 0; padding: 0; counter-reset: note; }
.notes li {
  counter-increment: note; position: relative;
  padding: 15px 0 15px 56px; border-bottom: 1px solid var(--hairline);
}
.notes li::before {
  content: counter(note, decimal-leading-zero);
  position: absolute; left: 0; top: 18px;
  font-family: var(--face-meta); font-size: .7rem; letter-spacing: .12em; color: var(--safelight);
}

/* 同类 */
.also { margin-top: 70px; padding-top: 30px; border-top: 1px solid var(--hairline); }
.also h2 { font-size: 1.28rem; margin: 0 0 26px; }
.also__list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 34px; }
.also__item a { display: block; color: inherit; }
.also__item img { width: 100%; height: auto; display: block; filter: grayscale(100%); transition: filter var(--emulsion); }
.also__item:hover img { filter: grayscale(0); }
.also__item span {
  display: block; margin-top: 13px; padding-top: 12px;
  border-top: 1px solid var(--hairline);
  font-family: var(--face-title); font-size: 1.04rem; line-height: 1.4;
  transition: color var(--emulsion);
}
.also__item:hover span { color: var(--safelight); }

/* ---------- 静态页 ---------- */
.leaf { max-width: 760px; padding: 74px 0 88px; }
.leaf h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); line-height: 1.12; margin: 0 0 30px; }
.leaf__body p { margin: 0 0 22px; }
.leaf__body p:first-child { font-family: var(--face-title); font-size: 1.24rem; line-height: 1.6; color: #d8d8d8; }

.void { color: var(--halide); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--hairline); background: var(--tray); margin-top: 0; }
.footer__row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 18px; padding: 36px 28px; }
.footer__brand { font-family: var(--face-title); font-size: 1.05rem; letter-spacing: .04em; }
.footer__brand i { font-style: normal; color: var(--safelight); }
.footer__links { display: flex; flex-wrap: wrap; gap: 24px; margin-left: auto; }
.footer__links a {
  font-family: var(--face-meta); font-size: .68rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--halide); transition: color var(--emulsion);
}
.footer__links a:hover { color: var(--silver); }
.footer__year { width: 100%; font-family: var(--face-meta); font-size: .68rem; letter-spacing: .16em; color: #5c5c5c; text-transform: uppercase; }

@media (max-width: 900px) {
  .frames, .also__list { grid-template-columns: repeat(2, 1fr); }
  .overture { padding: 84px 0 72px; }
  .band { padding: 60px 0; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .frames, .also__list { grid-template-columns: 1fr; gap: 40px; }
  .masthead__row { gap: 16px; height: 64px; }
  .masthead__nav { gap: 18px; }
  .plate { padding: 0 20px; }
  .footer__row { padding: 32px 20px; }
  .index__name { font-size: 1.14rem; }
  .notes li { padding-left: 44px; }
}

/* ---------- 编辑导语多段 ---------- */
.overture__sub p { margin: 0 0 18px; }
.overture__sub p:last-child { margin-bottom: 0; }
.lede__note p { margin: 0 0 18px; }
.lede__note p:last-child { margin-bottom: 0; }