/* 星轨片场 · 工序台视觉系统
   主张：深色片场控制台 + 胶片齿孔导轨 + 场记板分区 + 等宽数字时间码 */

:root {
  --bg: #080a11;
  --bg-2: #0c0f1a;
  --panel: #10131f;
  --panel-2: #161b2b;
  --line: #242b41;
  --line-soft: #1a2032;
  --ink: #eef1fb;
  --dim: #9aa3c0;
  --faint: #6a7392;
  --amber: #ffb13d;
  --amber-dim: #7a5416;
  --cyan: #53e0c8;
  --rose: #ff6b93;
  --violet: #9d8bff;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --gut: clamp(16px, 4.4vw, 44px);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(1200px 520px at 76% -8%, rgba(255, 177, 61, .10), transparent 62%),
    radial-gradient(900px 480px at 4% 22%, rgba(83, 224, 200, .07), transparent 60%);
  background-repeat: no-repeat;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.78;
  overflow-wrap: break-word;
}

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

a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--amber); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
  border-radius: 2px;
}

.wrap {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--amber);
  color: #15100a;
  padding: 10px 16px;
  font-weight: 700;
  z-index: 40;
}
.skip:focus { left: 8px; top: 8px; }

/* ── 顶栏 ───────────────────────────────────────────── */
.top {
  border-bottom: 1px solid var(--line-soft);
  background: rgba(8, 10, 17, .86);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 30;
}
/* 窄屏下导航能换到三行，再粘顶就会吃掉半个视口，所以只在宽屏粘顶。 */
@media (max-width: 760px) {
  .top { position: static; }
  section { scroll-margin-top: 12px; }
}
.top__in {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding-top: 12px;
  padding-bottom: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  margin-right: auto;
}
.brand:hover { color: var(--ink); }
.brand__mark { width: 26px; height: 26px; flex: 0 0 26px; }
.brand__sub {
  font: 500 11px/1 var(--mono);
  color: var(--faint);
  letter-spacing: .14em;
  border-left: 1px solid var(--line);
  padding-left: 9px;
  margin-left: 2px;
}
.navlinks {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.navlinks a {
  display: inline-block;
  font: 600 12.5px/1 var(--sans);
  color: var(--dim);
  text-decoration: none;
  padding: 7px 11px;
  border: 1px solid var(--line-soft);
  background: var(--panel);
}
.navlinks a:hover { color: #15100a; background: var(--amber); border-color: var(--amber); }

/* ── 胶片导轨 ───────────────────────────────────────── */
.rail { position: relative; }
@media (min-width: 1000px) {
  .rail::before {
    content: "";
    position: absolute;
    left: calc(var(--gut) - 26px);
    top: 0;
    bottom: 0;
    width: 10px;
    background:
      linear-gradient(var(--line-soft), var(--line-soft)) center / 1px 100% no-repeat,
      repeating-linear-gradient(to bottom, var(--line-soft) 0 7px, transparent 7px 22px) center / 5px 100% no-repeat;
    opacity: .9;
  }
}

/* ── 场记板 ─────────────────────────────────────────── */
section { scroll-margin-top: 74px; }

.slate {
  display: inline-flex;
  align-items: stretch;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  background: #05060b;
}
.slate::before {
  content: "";
  width: 9px;
  background: repeating-linear-gradient(135deg, var(--amber) 0 6px, #05060b 6px 12px);
}
.slate__id {
  font: 700 12px/1 var(--mono);
  letter-spacing: .16em;
  color: var(--amber);
  padding: 8px 10px 8px 11px;
}
.slate__kind {
  font: 600 12px/1 var(--mono);
  letter-spacing: .16em;
  color: var(--faint);
  padding: 8px 12px 8px 0;
}

h2 {
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 10px;
  font-weight: 800;
}
h3 {
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.45;
  margin: 0 0 8px;
  font-weight: 700;
}
h4 {
  font-size: 15px;
  margin: 0 0 6px;
  font-weight: 700;
  color: var(--ink);
}
p { margin: 0 0 14px; color: var(--dim); }
.lead { color: #c3cadf; font-size: clamp(15px, 1.9vw, 17.5px); }
strong { color: var(--ink); font-weight: 700; }
em { font-style: normal; }

.band { padding: clamp(44px, 7vw, 86px) 0; border-top: 1px solid var(--line-soft); }
.band--tint { background: linear-gradient(180deg, var(--bg-2), transparent 70%); }

/* ── 首屏 ───────────────────────────────────────────── */
.hero { padding: clamp(36px, 6vw, 72px) 0 clamp(34px, 5vw, 64px); }
.hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}
@media (min-width: 900px) {
  .hero__grid { grid-template-columns: minmax(0, 1.42fr) minmax(0, .88fr); }
}
.kicker {
  font: 700 11.5px/1 var(--mono);
  letter-spacing: .2em;
  color: var(--cyan);
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.kicker::after { content: ""; height: 1px; flex: 1; background: linear-gradient(90deg, var(--line), transparent); }

h1 {
  font-size: clamp(27px, 5.6vw, 54px);
  line-height: 1.16;
  letter-spacing: -.025em;
  font-weight: 850;
  margin: 0 0 18px;
  color: #fff;
}
/* 关键词整体成行：短剧标题里的关键词被劈成两行会直接妨碍阅读。
   以最小字号 27px 计算宽度约 190px，远小于 375px 视口的正文宽，不会撑出横向溢出。 */
h1 em,
h1 .kw {
  display: inline-block;
  white-space: nowrap;
  max-width: 100%;
  color: var(--amber);
  background: linear-gradient(transparent 68%, rgba(255, 177, 61, .22) 68%);
  padding-bottom: 2px;
}
h1 .kw { color: inherit; background: none; padding-bottom: 0; }

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.hero__meta li {
  font: 600 12px/1 var(--mono);
  color: var(--dim);
  border: 1px dashed var(--line);
  padding: 8px 10px;
}
.hero__meta b { color: var(--amber); font-weight: 700; }

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 700 14px/1 var(--sans);
  padding: 13px 18px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  transition: background .14s, border-color .14s, color .14s;
}
.btn:hover { border-color: var(--amber); color: var(--amber); background: var(--panel); }
.btn--go {
  background: var(--amber);
  border-color: var(--amber);
  color: #15100a;
}
.btn--go:hover { background: #ffc466; border-color: #ffc466; color: #15100a; }
.btn--ghost { background: transparent; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

.phone-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  padding: 18px 18px 14px;
}
.phone-card figcaption {
  font: 500 12.5px/1.65 var(--sans);
  color: var(--faint);
  margin-top: 12px;
  border-top: 1px solid var(--line-soft);
  padding-top: 10px;
}

/* ── 通用卡片网格 ───────────────────────────────────── */
.grid { display: grid; gap: 14px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 620px) { .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 860px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1040px) { .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

.card {
  border: 1px solid var(--line-soft);
  background: var(--panel);
  padding: 18px 18px 16px;
  position: relative;
}
.card p:last-child { margin-bottom: 0; }
.card__no {
  font: 700 11px/1 var(--mono);
  letter-spacing: .16em;
  color: var(--faint);
  display: block;
  margin-bottom: 9px;
}
.card__ico { width: 28px; height: 28px; margin-bottom: 11px; }

/* 工序步骤卡 */
.steps { counter-reset: st; display: grid; gap: 12px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.step {
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--amber-dim);
  background: var(--panel);
  padding: 16px 16px 14px;
}
.step:nth-child(4n+2) { border-left-color: #1b5a51; }
.step:nth-child(4n+3) { border-left-color: #4a3a7a; }
.step:nth-child(4n) { border-left-color: #6d2b40; }
.step__hd { display: flex; align-items: baseline; gap: 10px; margin-bottom: 7px; }
.step__n { font: 700 12px/1 var(--mono); color: var(--amber); letter-spacing: .1em; }
.step h3 { margin: 0; font-size: 16.5px; }
.step p { margin: 0 0 8px; font-size: 14.5px; line-height: 1.72; }
.step__bn {
  font-size: 13.5px;
  color: #c0b08c;
  border-top: 1px dashed var(--line);
  padding-top: 8px;
  margin: 0;
}
.step__bn b { color: var(--amber); font-weight: 700; }

/* ── 工具面板 ───────────────────────────────────────── */
.tool {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel-2), var(--panel) 42%);
  clip-path: polygon(0 16px, 16px 0, 100% 0, 100% 100%, 0 100%);
  padding: clamp(18px, 3vw, 28px);
}
.tool__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--faint);
  border-left: 2px solid var(--line);
  padding-left: 11px;
  margin: 0 0 20px;
}
.fields {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
  margin-bottom: 18px;
}
@media (min-width: 620px) { .fields { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 960px) { .fields--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.field { min-width: 0; }
.field > label,
.field > .flabel {
  display: block;
  font: 700 12px/1.5 var(--mono);
  letter-spacing: .08em;
  color: var(--dim);
  margin-bottom: 7px;
}
.field select,
.field input[type="number"] {
  width: 100%;
  font: 600 15px/1.4 var(--sans);
  color: var(--ink);
  background: #080a12;
  border: 1px solid var(--line);
  padding: 11px 12px;
  appearance: none;
  -webkit-appearance: none;
}
.field select {
  background-image: linear-gradient(45deg, transparent 50%, var(--amber) 50%), linear-gradient(135deg, var(--amber) 50%, transparent 50%);
  background-position: right 16px top 50%, right 11px top 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 32px;
}
.field select:focus,
.field input:focus { border-color: var(--amber); outline: none; }
.field__hint { font-size: 12px; color: var(--faint); margin: 6px 0 0; line-height: 1.6; }

.radiorow { display: flex; flex-wrap: wrap; gap: 8px; }
.radiorow label {
  font: 600 13.5px/1 var(--sans);
  color: var(--dim);
  border: 1px solid var(--line);
  background: #080a12;
  padding: 11px 13px;
  cursor: pointer;
}
.radiorow input { position: absolute; opacity: 0; width: 0; height: 0; }
.radiorow input:checked + span { color: var(--amber); }
.radiorow label:has(input:checked) { border-color: var(--amber); background: rgba(255, 177, 61, .08); }
.radiorow label:has(input:focus-visible) { outline: 2px solid var(--amber); outline-offset: 2px; }

.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.status {
  font: 600 12.5px/1.5 var(--mono);
  color: var(--cyan);
  min-height: 19px;
}
.status--warn { color: var(--rose); }

/* ── 结果区 ─────────────────────────────────────────── */
.out { margin-top: 22px; border-top: 1px solid var(--line); padding-top: 20px; }
.out[hidden] { display: none; }

.sum {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 18px;
}
@media (min-width: 760px) { .sum { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.sum div {
  border: 1px solid var(--line-soft);
  background: #090b13;
  padding: 11px 12px;
}
.sum dt { font: 600 11px/1.4 var(--mono); letter-spacing: .1em; color: var(--faint); margin: 0 0 4px; }
.sum dd { margin: 0; font: 700 19px/1.2 var(--mono); color: var(--amber); font-variant-numeric: tabular-nums; }
.sum dd small { font: 600 12px/1 var(--sans); color: var(--dim); margin-left: 3px; }

.eps { display: grid; gap: 12px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 820px) { .eps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.ep {
  border: 1px solid var(--line-soft);
  background: #0b0e17;
  padding: 14px 14px 12px;
  min-width: 0;
}
.ep--key { border-color: var(--amber-dim); background: linear-gradient(180deg, rgba(255, 177, 61, .07), #0b0e17 60%); }
.ep__hd { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 4px; }
.ep__n { font: 800 13px/1 var(--mono); color: var(--amber); letter-spacing: .06em; }
.ep__tag {
  font: 700 11px/1 var(--mono);
  letter-spacing: .08em;
  color: var(--cyan);
  border: 1px solid #1d4e49;
  padding: 5px 7px;
}
.ep--key .ep__tag { color: var(--rose); border-color: #5e2638; }
.ep__fn { font-size: 13px; color: var(--faint); margin: 0 0 10px; line-height: 1.6; }
.beat { display: grid; grid-template-columns: 74px minmax(0, 1fr); gap: 4px 10px; padding: 7px 0; border-top: 1px dashed var(--line-soft); }
.beat__tc { font: 600 11.5px/1.6 var(--mono); color: var(--faint); font-variant-numeric: tabular-nums; }
.beat__bd { min-width: 0; }
.beat__lb { font: 700 11.5px/1.6 var(--mono); color: var(--cyan); letter-spacing: .06em; display: block; }
.ep--key .beat__lb { color: var(--amber); }
.beat__tx { font-size: 14px; line-height: 1.7; color: #c8cfe4; }

.export { margin-top: 18px; }
.export label { display: block; font: 700 12px/1.5 var(--mono); color: var(--dim); margin-bottom: 7px; letter-spacing: .08em; }
textarea {
  width: 100%;
  min-height: 190px;
  resize: vertical;
  font: 400 13px/1.75 var(--mono);
  color: #cfd6ea;
  background: #06080e;
  border: 1px solid var(--line);
  padding: 12px;
}
textarea:focus { border-color: var(--amber); outline: none; }

/* 估算器条形图 */
.bars { display: grid; gap: 10px; margin: 0 0 18px; }
.bar { display: grid; grid-template-columns: minmax(0, 1fr); gap: 5px; }
.bar__hd { display: flex; justify-content: space-between; gap: 10px; font-size: 14px; }
.bar__nm { font-weight: 700; color: var(--ink); }
.bar__pc { font: 700 13.5px/1.5 var(--mono); color: var(--amber); font-variant-numeric: tabular-nums; white-space: nowrap; }
.bar__track { height: 9px; background: #090b13; border: 1px solid var(--line-soft); }
.bar__fill { height: 100%; background: linear-gradient(90deg, var(--amber), #ff8a3d); }
.bar--cy .bar__fill { background: linear-gradient(90deg, var(--cyan), #2f9ec7); }
.bar--vi .bar__fill { background: linear-gradient(90deg, var(--violet), #6a5acd); }
.bar__tip { font-size: 13px; color: var(--faint); line-height: 1.65; }
.bar__tip b { color: #d3bb8d; font-weight: 700; }

.risk {
  border: 1px solid var(--line);
  background: #090b13;
  padding: 14px 15px;
}
.risk h4 { margin-bottom: 8px; }
.risk ul { margin: 0; padding-left: 18px; }
.risk li { font-size: 14px; line-height: 1.75; color: var(--dim); margin-bottom: 6px; }
.risk li:last-child { margin-bottom: 0; }
.risk li b { color: var(--amber); font-weight: 700; }

/* 自检清单 */
.ck { display: grid; gap: 12px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 880px) { .ck { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.ckgroup { border: 1px solid var(--line-soft); background: var(--panel); padding: 15px 15px 11px; }
.ckgroup > h4 {
  font: 700 12px/1 var(--mono);
  letter-spacing: .12em;
  color: var(--cyan);
  margin-bottom: 12px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line-soft);
}
.ckitem { display: flex; gap: 11px; padding: 9px 0; align-items: flex-start; cursor: pointer; }
.ckitem + .ckitem { border-top: 1px dashed var(--line-soft); }
.ckitem input { position: absolute; opacity: 0; width: 0; height: 0; }
.ckbox {
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border: 1px solid var(--line);
  background: #06080e;
  position: relative;
}
.ckitem input:checked + .ckbox { background: var(--cyan); border-color: var(--cyan); }
.ckitem input:checked + .ckbox::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border: solid #04231f;
  border-width: 0 2px 2px 0;
  transform: rotate(42deg);
}
.ckitem input:focus-visible + .ckbox { outline: 2px solid var(--amber); outline-offset: 2px; }
.ckitem__bd { min-width: 0; }
.ckitem__t { display: block; font-size: 14.5px; font-weight: 700; color: var(--ink); line-height: 1.6; }
.ckitem__d { display: block; font-size: 13px; color: var(--faint); line-height: 1.65; margin-top: 2px; }
.ckitem input:checked ~ .ckitem__bd .ckitem__t { color: var(--faint); text-decoration: line-through; text-decoration-color: var(--line); }

.meter { margin: 18px 0 0; border: 1px solid var(--line); background: #090b13; padding: 14px 15px; }
.meter__hd { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; align-items: baseline; margin-bottom: 9px; }
.meter__n { font: 800 20px/1 var(--mono); color: var(--cyan); font-variant-numeric: tabular-nums; }
.meter__track { height: 7px; background: #06080e; border: 1px solid var(--line-soft); }
.meter__fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--cyan), var(--amber)); transition: width .18s; }
.meter__left { font-size: 13.5px; color: var(--dim); margin: 10px 0 0; line-height: 1.7; }
.meter__left b { color: var(--amber); font-weight: 700; }

/* ── 对照与问答 ─────────────────────────────────────── */
.scroll-x { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line-soft); }
table { border-collapse: collapse; width: 100%; min-width: 520px; font-size: 14px; }
caption { text-align: left; font-size: 13px; color: var(--faint); padding: 10px 12px; border-bottom: 1px solid var(--line-soft); }
th, td { padding: 11px 13px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line-soft); line-height: 1.68; }
th { font: 700 12.5px/1.5 var(--mono); letter-spacing: .06em; color: var(--amber); background: #090b13; white-space: nowrap; }
td { color: var(--dim); }
td:first-child { color: var(--ink); font-weight: 700; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: none; }

.qa { border-top: 1px solid var(--line-soft); padding: 16px 0 4px; }
.qa:first-of-type { border-top: none; }
.qa h3 { color: var(--ink); }
.qa p:last-child { margin-bottom: 12px; }

.note {
  border: 1px solid var(--amber-dim);
  background: rgba(255, 177, 61, .05);
  padding: 14px 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: #cdbd99;
}
.note b { color: var(--amber); }
.note p { color: inherit; margin: 0; }

.foot { border-top: 1px solid var(--line); padding: 32px 0 40px; background: #06080e; }
.foot__in { display: grid; gap: 18px; }
@media (min-width: 760px) { .foot__in { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); } }
.foot p { font-size: 13px; color: var(--faint); margin: 0 0 8px; line-height: 1.8; }
.foot b { color: var(--dim); }
.foot__links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 16px; }
.foot__links a { font-size: 13px; }

/* ── 404 ────────────────────────────────────────────── */
.lost { min-height: 62vh; display: flex; align-items: center; padding: 60px 0; }
.lost__grid { display: grid; gap: 30px; grid-template-columns: minmax(0, 1fr); align-items: center; }
@media (min-width: 820px) { .lost__grid { grid-template-columns: minmax(0, 1fr) minmax(0, .72fr); } }
.lost h1 { font-size: clamp(24px, 4.6vw, 40px); }
.lost__code { font: 800 clamp(56px, 13vw, 120px)/1 var(--mono); color: var(--line); letter-spacing: -.04em; margin: 0 0 6px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}