/* Daotip · notebook sheet, index-card tabs, highlighter ink */

:root {
  --desk: #e7e2d4;
  --desk-deep: #d9d2bf;
  --sheet: #fdfcf7;
  --grid-line: rgba(92, 120, 146, .11);
  --grid-step: 16px;
  --graphite: #2a2c31;
  --pencil: #686c74;
  --pencil-soft: #a3a6ac;
  --ballpoint: #2a52a0;
  --redpen: #c4453a;
  --margin-rule: rgba(214, 120, 112, .42);
  --hl: rgba(244, 255, 66, .82);
  --hl-solid: #f2fc49;
  --kraft: #c29e6e;
  --kraft-ink: #2b1f12;
  --tab-a: #f4d3c9;
  --tab-b: #cde1f1;
  --tab-c: #d5eac6;
  --tab-d: #f5e49f;
  --tab-e: #e2d5ef;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "BiauKai", "楷体", var(--serif);
  --type: "Courier Prime", "Courier New", ui-monospace, monospace;
  --gutter: 112px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 28px;
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background-color: var(--desk);
  background-image:
    radial-gradient(1200px 600px at 78% -10%, rgba(255, 250, 232, .7), transparent 70%),
    repeating-linear-gradient(87deg, rgba(120, 96, 60, .025) 0 2px, transparent 2px 9px);
  color: var(--graphite);
  font: 400 1.0625rem/1.9 var(--sans);
  overflow-x: hidden;
}

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

a { color: var(--ballpoint); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .22em; text-decoration-color: rgba(42, 82, 160, .42); }
a:hover { text-decoration-color: currentColor; background: linear-gradient(transparent 58%, rgba(244, 255, 66, .55) 58%); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px dashed var(--ballpoint); outline-offset: 3px; }

.dt-skip { position: absolute; left: -999px; top: 8px; background: var(--sheet); padding: 6px 12px; z-index: 50; }
.dt-skip:focus { left: 12px; }

/* ---------- desk top bar ---------- */
.dt-bar {
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 28px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.dt-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--graphite); text-decoration: none; }
.dt-brand:hover { background: none; }
.dt-brand svg { width: 34px; height: 34px; flex: none; }
.dt-brand b { font: 700 1.42rem/1 var(--serif); letter-spacing: .01em; }
.dt-brand b i { font-style: normal; background: linear-gradient(transparent 52%, var(--hl) 52%, var(--hl) 92%, transparent 92%); padding: 0 .06em; }
.dt-nav { display: flex; gap: 4px; font-size: .94rem; }
.dt-nav a { color: var(--graphite); text-decoration: none; padding: 4px 12px; border-radius: 999px; }
.dt-nav a:hover { background: rgba(255, 255, 255, .55); }
.dt-nav a[aria-current] { background: var(--sheet); box-shadow: inset 0 0 0 1px rgba(42, 44, 49, .16); }

/* ---------- desk: sheet + index rail ---------- */
.dt-desk {
  display: grid;
  grid-template-columns: minmax(0, 868px) 262px;
  justify-content: center;
  align-items: start;
  padding: 6px 24px 96px;
}

.dt-sheet {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 60px 64px 88px var(--gutter);
  background-color: var(--sheet);
  background-image:
    linear-gradient(90deg, rgba(60, 48, 24, .07), transparent 26px),
    linear-gradient(90deg, transparent calc(var(--gutter) - 26px), var(--margin-rule) calc(var(--gutter) - 26px), var(--margin-rule) calc(var(--gutter) - 25px), transparent calc(var(--gutter) - 25px)),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: auto, auto, var(--grid-step) var(--grid-step), var(--grid-step) var(--grid-step);
  background-position: 0 0, 0 0, -1px -1px, -1px -1px;
  border-radius: 3px 10px 10px 3px;
  box-shadow:
    1px 1px 0 #ebe8de,
    3px 2px 0 #f7f5ee,
    4px 3px 0 #dad6c9,
    6px 4px 0 #f4f2ea,
    7px 5px 0 #d3cfc1,
    0 22px 46px -22px rgba(64, 50, 24, .42),
    0 2px 6px rgba(64, 50, 24, .08);
}
.dt-sheet > * { order: 3; }
.dt-sheet > header { order: 1; }
.dt-sheet > .dt-photo { order: 2; }

/* ---------- hero header ---------- */
[data-part="hero"] { position: relative; padding-top: 30px; }
[data-part="kicker"] {
  margin: 0 0 14px;
  font: 400 1.02rem/1.5 var(--kai);
  color: var(--pencil);
}
[data-part="kicker"]::before {
  content: "";
  display: inline-block;
  width: 26px;
  height: .62em;
  margin-right: 10px;
  background: var(--hl);
  transform: skewX(-14deg) translateY(1px);
  border-radius: 2px;
}
[data-part="hero"] h1 {
  margin: 0;
  font: 700 2.36rem/1.36 var(--serif);
  letter-spacing: .005em;
  color: #1f2126;
  text-wrap: pretty;
}
[data-part="dek"] {
  margin: 24px 0 0;
  font-size: 1.14rem;
  line-height: 1.86;
  color: #3a3d43;
}
[data-part="meta"] {
  position: absolute;
  top: -26px;
  right: 0;
  margin: 0;
  font: 400 .9rem/1.6 var(--kai);
  color: var(--pencil);
  padding: 0 2px 2px 54px;
  border-bottom: 1px dotted var(--pencil-soft);
  max-width: 100%;
}
[data-part="meta"]::before {
  content: "日期";
  position: absolute;
  left: 0;
  bottom: 3px;
  font: 700 .72rem/1 var(--type);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--pencil-soft);
}

/* hero photo, taped in */
.dt-photo {
  position: relative;
  margin: 40px -34px 8px -46px;
  padding: 10px 10px 12px;
  background: #fff;
  box-shadow: 0 1px 2px rgba(40, 30, 10, .12), 0 16px 30px -18px rgba(40, 30, 10, .45);
  transform: rotate(-.55deg);
}
.dt-photo img { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; object-position: 50% 52%; }
.dt-photo::before, .dt-photo::after {
  content: "";
  position: absolute;
  width: 112px;
  height: 28px;
  background: rgba(240, 236, 196, .78);
  box-shadow: 0 1px 1px rgba(0, 0, 0, .05);
  border-left: 1px dashed rgba(160, 150, 110, .35);
  border-right: 1px dashed rgba(160, 150, 110, .35);
}
.dt-photo::before { top: -12px; left: 34px; transform: rotate(-6deg); }
.dt-photo::after { top: -11px; right: 40px; transform: rotate(5deg); }

/* ---------- article body ---------- */
.dt-sheet section { position: relative; margin-top: 88px; counter-increment: dt-sec; }
.dt-sheet { counter-reset: dt-sec; }
.dt-sheet p { margin: 0 0 1.05em; }
.dt-sheet section > h2 {
  position: relative;
  margin: 0 0 26px;
  font: 700 1.7rem/1.46 var(--serif);
  color: #1f2126;
  text-wrap: pretty;
}
/* page flag in the margin, colour matches its index card */
.dt-sheet section > h2::before {
  content: counter(dt-sec, decimal-leading-zero);
  position: absolute;
  left: calc(-1 * var(--gutter) + 2px);
  top: .22em;
  width: 66px;
  padding: 5px 0 5px 14px;
  font: 700 .86rem/1.3 var(--type);
  letter-spacing: .06em;
  color: rgba(42, 44, 49, .78);
  background: var(--flag, var(--tab-d));
  border-radius: 0 6px 6px 0;
  box-shadow: 1px 1px 0 rgba(0, 0, 0, .06);
}
.dt-sheet section:nth-of-type(5n+1) { --flag: var(--tab-a); }
.dt-sheet section:nth-of-type(5n+2) { --flag: var(--tab-b); }
.dt-sheet section:nth-of-type(5n+3) { --flag: var(--tab-c); }
.dt-sheet section:nth-of-type(5n+4) { --flag: var(--tab-d); }
.dt-sheet section:nth-of-type(5n+5) { --flag: var(--tab-e); }

.dt-sheet h3 {
  margin: 34px 0 10px;
  font: 700 1.14rem/1.6 var(--sans);
  color: #24262b;
}
.dt-sheet h3::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  margin: 0 10px 2px 0;
  border: 1.5px solid var(--graphite);
  border-radius: 50% 40% 55% 45%;
  vertical-align: middle;
}
.dt-sheet strong { font-weight: 650; color: #1c1e22; }

/* highlighter */
.dt-sheet mark {
  color: inherit;
  background-color: transparent;
  background-image: linear-gradient(100deg, rgba(244, 255, 66, 0) 0, var(--hl) .3em, var(--hl) calc(100% - .3em), rgba(244, 255, 66, 0) 100%);
  background-repeat: no-repeat;
  background-size: 100% 76%;
  background-position: 0 62%;
  padding: 0 .12em;
  margin: 0 -.06em;
  border-radius: .3em .12em .35em .1em;
}
.dt-ink .dt-sheet mark { background-size: 0 76%; transition: background-size 1.1s cubic-bezier(.6, .1, .3, 1); }
.dt-ink .dt-sheet mark.dt-drawn { background-size: 100% 76%; }
.dt-sheet mark:target { outline: 2px dashed rgba(42, 44, 49, .35); outline-offset: 3px; }

/* lists */
.dt-sheet ul { list-style: none; margin: 0 0 1.2em; padding: 0; }
.dt-sheet ul > li { position: relative; padding-left: 26px; margin-bottom: .5em; }
.dt-sheet ul > li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .92em;
  width: 12px;
  height: 2px;
  background: var(--pencil);
  border-radius: 2px;
  transform: rotate(-4deg);
}
.dt-sheet ol:not([data-part]) { list-style: none; counter-reset: dt-ol; margin: 0 0 1.2em; padding: 0; }
.dt-sheet ol:not([data-part]) > li { position: relative; padding-left: 34px; margin-bottom: .5em; counter-increment: dt-ol; }
.dt-sheet ol:not([data-part]) > li::before {
  content: counter(dt-ol) ".";
  position: absolute;
  left: 4px;
  top: 0;
  font: 400 1.12rem/1.75 var(--kai);
  color: var(--pencil);
}

/* steps: pencil-circled numbers hanging in the margin */
ol[data-part="steps"] { list-style: none; counter-reset: dt-step; margin: 8px 0 30px; padding: 0; }
ol[data-part="steps"] > li { position: relative; counter-increment: dt-step; padding-bottom: 22px; }
ol[data-part="steps"] > li::before {
  content: counter(dt-step);
  position: absolute;
  left: -62px;
  top: -1px;
  width: 38px;
  height: 36px;
  display: grid;
  place-items: center;
  font: 400 1.25rem/1 var(--kai);
  color: var(--graphite);
  background: var(--sheet);
  border: 1.6px solid var(--graphite);
  border-radius: 52% 44% 50% 47% / 47% 53% 45% 52%;
  transform: rotate(-4deg);
}
ol[data-part="steps"] > li:nth-child(3n+2)::before { transform: rotate(3deg); border-radius: 46% 54% 44% 52% / 54% 46% 52% 44%; }
ol[data-part="steps"] > li::after {
  content: "";
  position: absolute;
  left: -44px;
  top: 40px;
  bottom: 4px;
  border-left: 1.5px dotted var(--pencil-soft);
}
ol[data-part="steps"] > li:last-child::after { display: none; }
ol[data-part="steps"] > li > p:last-child { margin-bottom: .4em; }

/* screenshots taped in */
figure[data-part="shot"] {
  position: relative;
  margin: 30px -10px 34px;
  padding: 0;
}
figure[data-part="shot"] img {
  width: 100%;
  background: #fff;
  border: 9px solid #fff;
  box-shadow: 0 0 0 1px rgba(42, 44, 49, .1), 0 14px 26px -16px rgba(40, 30, 10, .45);
}
figure[data-part="shot"] img[src$="-m.webp"] { max-width: 360px; margin: 0 auto; }
figure[data-part="shot"]::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 50%;
  width: 96px;
  height: 24px;
  margin-left: -48px;
  background: rgba(214, 228, 240, .8);
  border-left: 1px dashed rgba(110, 140, 170, .35);
  border-right: 1px dashed rgba(110, 140, 170, .35);
  transform: rotate(-2.5deg);
  z-index: 1;
}
figure[data-part="shot"] figcaption {
  margin: 12px 4px 0;
  font: 400 .97rem/1.6 var(--kai);
  color: var(--pencil);
  text-align: center;
}
figure[data-part="shot"] figcaption::before { content: "↑ "; color: var(--pencil-soft); }

/* sticky note */
[data-part="note"] {
  position: relative;
  margin: 28px 0 30px 18px;
  padding: 20px 24px 8px 26px;
  background: #e8f0f8;
  font-family: var(--kai);
  font-size: 1.1rem;
  line-height: 1.85;
  color: #33404f;
  box-shadow: 0 1px 1px rgba(0, 0, 0, .06), 6px 12px 20px -14px rgba(40, 60, 90, .45);
  transform: rotate(.35deg);
  border-radius: 2px 2px 14px 2px;
}
[data-part="note"]::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 28px;
  width: 70px;
  height: 20px;
  background: rgba(244, 255, 66, .55);
  transform: rotate(-4deg);
}

/* red-pen warning */
[data-part="warn"] {
  position: relative;
  margin: 30px 0;
  padding: 18px 22px 6px 24px;
  border: 1.6px solid var(--redpen);
  border-radius: 255px 14px 225px 16px / 16px 225px 14px 255px;
  color: #3b2523;
}
[data-part="warn"]::before {
  content: "!";
  position: absolute;
  left: -62px;
  top: 14px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  font: 700 1.2rem/1 var(--serif);
  color: var(--redpen);
  border: 1.6px solid var(--redpen);
  border-radius: 50% 46% 52% 48%;
  transform: rotate(6deg);
}

/* tables, ruled by hand */
.dt-sheet table {
  width: 100%;
  margin: 18px 0 30px;
  border-collapse: collapse;
  background: rgba(253, 252, 247, .94);
  font-size: .95rem;
  line-height: 1.72;
  border-top: 2px solid var(--graphite);
  border-bottom: 2px solid var(--graphite);
}
.dt-sheet th {
  text-align: left;
  font: 700 .9rem/1.5 var(--sans);
  color: #33363c;
  padding: 10px 12px;
  border-bottom: 1px solid var(--graphite);
  background: rgba(232, 228, 214, .55);
}
.dt-sheet td { padding: 11px 12px; vertical-align: top; border-bottom: 1px dashed #c8c5ba; }
.dt-sheet tr:last-child td { border-bottom: 0; }
.dt-sheet td:first-child { font-weight: 600; color: #26282d; }

/* ---------- invite card clipped into the notebook ---------- */
[data-part="cta"] {
  position: relative;
  margin: 84px 18px 12px 6px;
  padding: 50px 40px 24px;
  background-color: #fffefb;
  background-image:
    linear-gradient(transparent 33px, rgba(205, 72, 64, .55) 33px, rgba(205, 72, 64, .55) 35px, transparent 35px),
    repeating-linear-gradient(transparent 0 31px, rgba(80, 130, 190, .2) 31px 32px);
  background-position: 0 0, 0 35px;
  background-repeat: no-repeat, repeat;
  border-radius: 4px;
  box-shadow: 0 1px 2px rgba(40, 30, 10, .14), 0 26px 40px -26px rgba(40, 30, 10, .55), 0 0 0 1px rgba(42, 44, 49, .06);
  transform: rotate(-.8deg);
}
[data-part="cta"]::before {
  content: "";
  position: absolute;
  top: -30px;
  left: 46px;
  width: 30px;
  height: 84px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 84'%3E%3Cpath d='M9 26V12a6 6 0 0 1 12 0v52a9 9 0 0 1-18 0V20' fill='none' stroke='%237d838c' stroke-width='2.6' stroke-linecap='round'/%3E%3Cpath d='M9 26V12a6 6 0 0 1 12 0v52a9 9 0 0 1-18 0V20' fill='none' stroke='%23e7eaee' stroke-width='.9' stroke-linecap='round' transform='translate(-.6 -.6)'/%3E%3C/svg%3E") no-repeat center / contain;
  transform: rotate(4deg);
  filter: drop-shadow(1px 2px 1px rgba(0, 0, 0, .18));
}
[data-part="cta"] p { margin: 0 0 14px; line-height: 2; }
[data-part="cta"] [data-k="code"] {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0 0 18px;
  font: 700 2.9rem/1.1 var(--type);
  letter-spacing: .12em;
  color: #17181b;
}
[data-part="cta"] [data-k="code"]::before {
  content: "邀请码";
  flex-basis: 100%;
  font: 400 .98rem/1.4 var(--kai);
  letter-spacing: .1em;
  color: var(--pencil);
}
.dt-code { background: linear-gradient(transparent 56%, var(--hl) 56%, var(--hl) 94%, transparent 94%); padding: 0 .08em; }
.dt-copy {
  font: 600 .92rem/1 var(--sans);
  letter-spacing: .06em;
  color: var(--graphite);
  background: var(--sheet);
  border: 1.5px solid var(--graphite);
  border-radius: 8px 3px 8px 3px;
  padding: 9px 16px;
  cursor: pointer;
  transform: rotate(1.5deg);
  transition: background .2s, transform .2s;
}
.dt-copy:hover { background: #fff; transform: rotate(0); }
.dt-copy.dt-ok { background: var(--hl-solid); }
[data-part="cta"] a[data-cta] {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 4px 0 2px;
  padding: 15px 26px;
  font: 700 1.06rem/1.3 var(--sans);
  color: #15161a;
  text-decoration: none;
  background: var(--hl-solid);
  border: 2px solid #15161a;
  border-radius: 12px 6px 12px 6px;
  box-shadow: 3px 4px 0 rgba(21, 22, 26, .85);
  transition: transform .15s, box-shadow .15s;
}
[data-part="cta"] a[data-cta]::after {
  content: "";
  width: 14px;
  height: 14px;
  flex: none;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 14'%3E%3Cpath d='M3 11 11 3M5 3h6v6' fill='none' stroke='%2315161a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center / contain;
}
[data-part="cta"] a[data-cta]:hover { transform: translate(1px, 1px); box-shadow: 2px 3px 0 rgba(21, 22, 26, .85); }
[data-part="cta"] p:last-child {
  margin: 18px 0 0;
  padding-top: 12px;
  border-top: 1px dashed #b9b6ab;
  font-size: .95rem;
  line-height: 1.85;
  color: #3e4147;
}

/* ---------- FAQ ---------- */
#faq details { border-top: 1px dashed #c3c0b5; }
#faq details:last-of-type { border-bottom: 1px dashed #c3c0b5; }
#faq summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 17px 44px 17px 0;
  font: 650 1.04rem/1.7 var(--sans);
  color: #1f2126;
}
#faq summary::-webkit-details-marker { display: none; }
#faq summary::before {
  content: "问";
  position: absolute;
  left: -58px;
  top: 17px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font: 400 .98rem/1 var(--kai);
  color: var(--pencil);
  border: 1.4px solid var(--pencil-soft);
  border-radius: 48% 52% 46% 54%;
}
#faq summary::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 50%;
  width: 16px;
  height: 16px;
  margin-top: -8px;
  background:
    linear-gradient(var(--graphite), var(--graphite)) center / 16px 2px no-repeat,
    linear-gradient(var(--graphite), var(--graphite)) center / 2px 16px no-repeat;
  border-radius: 2px;
  transition: transform .25s;
}
#faq details[open] summary::after { transform: rotate(45deg); }
#faq details[open] summary::before { background: var(--hl); border-color: transparent; color: var(--graphite); }
#faq details > p {
  margin: 0 0 20px;
  padding: 2px 0 0 0;
  color: #383b41;
  font-size: 1rem;
  line-height: 1.9;
}
#faq details > p::before {
  content: "答 ";
  font: 400 1.02rem/1 var(--kai);
  color: var(--pencil);
}

/* ---------- index rail (desktop): cards poking out of the right edge ---------- */
.dt-index {
  position: sticky;
  top: 18px;
  z-index: 1;
  margin: 92px 0 0 -16px;
  max-height: calc(100vh - 36px);
  overflow-y: auto;
  scrollbar-width: none;
  padding: 0 14px 10px 0;
}
.dt-index::-webkit-scrollbar { display: none; }
.dt-index-h {
  margin: 0 0 10px 30px;
  font: 400 .92rem/1.4 var(--kai);
  color: var(--pencil);
}
.dt-tabs { position: relative; list-style: none; margin: 0; padding: 0; counter-reset: dt-tab; }
.dt-tabs > li { counter-increment: dt-tab; margin: 0 0 5px; --card: var(--tab-d); }
.dt-tabs > li:nth-child(5n+1) { --card: var(--tab-a); }
.dt-tabs > li:nth-child(5n+2) { --card: var(--tab-b); }
.dt-tabs > li:nth-child(5n+3) { --card: var(--tab-c); }
.dt-tabs > li:nth-child(5n+4) { --card: var(--tab-d); }
.dt-tabs > li:nth-child(5n+5) { --card: var(--tab-e); }
.dt-tabs a {
  position: relative;
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 6px;
  align-items: start;
  min-height: 48px;
  padding: 8px 14px 8px 34px;
  color: #2c2e33;
  text-decoration: none;
  font-size: .82rem;
  line-height: 1.42;
  background-color: var(--card);
  background-image:
    linear-gradient(transparent 6px, rgba(196, 69, 58, .3) 6px, rgba(196, 69, 58, .3) 7px, transparent 7px),
    linear-gradient(90deg, rgba(0, 0, 0, .06), transparent 30px);
  border-radius: 0 10px 10px 0;
  box-shadow: 0 1px 0 rgba(0, 0, 0, .05), 3px 5px 10px -7px rgba(60, 40, 10, .45);
  transform: translateX(-8px);
  transition: transform .25s ease, box-shadow .25s ease, filter .25s;
  filter: saturate(.82);
}
.dt-tabs a::before {
  content: counter(dt-tab, decimal-leading-zero);
  font: 700 .74rem/1.9 var(--type);
  color: rgba(42, 44, 49, .62);
}
.dt-tabs a > span {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.dt-tabs a:hover { transform: translateX(-2px); background: var(--card); filter: none; }
.dt-tabs li.dt-read a::after {
  content: "✓";
  position: absolute;
  right: 9px;
  bottom: 4px;
  font: 400 .8rem/1 var(--kai);
  color: rgba(42, 44, 49, .5);
}
.dt-tabs li.dt-on a {
  transform: translateX(10px);
  filter: none;
  font-weight: 650;
  box-shadow: 0 1px 0 rgba(0, 0, 0, .06), 6px 8px 16px -8px rgba(60, 40, 10, .55);
}
.dt-tabs li.dt-on a::before { color: var(--graphite); }
@media (max-height: 820px) and (min-width: 1161px) {
  .dt-tabs a { min-height: 36px; padding-top: 6px; padding-bottom: 6px; }
  .dt-tabs a > span { -webkit-line-clamp: 1; }
  .dt-tabs > li { margin-bottom: 4px; }
}

/* highlighter digest */
.dt-dg-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 0 22px;
  padding: 8px 14px;
  font: 400 .9rem/1.3 var(--kai);
  color: var(--graphite);
  background: var(--sheet);
  border: 1.4px solid rgba(42, 44, 49, .55);
  border-radius: 999px;
  cursor: pointer;
}
.dt-dg-btn::before { content: ""; width: 18px; height: 9px; background: var(--hl-solid); transform: skewX(-14deg); border-radius: 2px; }
.dt-dg-btn b { font: 700 .82rem/1 var(--type); }
.dt-dg {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 40;
  width: min(380px, calc(100vw - 24px));
  max-height: min(72vh, 620px);
  overflow-y: auto;
  padding: 44px 24px 16px;
  background-color: #fffefb;
  background-image: linear-gradient(transparent 28px, rgba(205, 72, 64, .5) 28px, rgba(205, 72, 64, .5) 30px, transparent 30px);
  background-repeat: no-repeat;
  border-radius: 6px;
  box-shadow: 0 0 0 1px rgba(42, 44, 49, .08), 0 30px 60px -24px rgba(40, 30, 10, .55);
}
.dt-dg[hidden] { display: none; }
.dt-dg-t { position: absolute; top: 6px; left: 24px; margin: 0; font: 400 .92rem/1.4 var(--kai); color: var(--pencil); }
.dt-dg-x { position: absolute; top: 4px; right: 10px; border: 0; background: none; font: 400 .9rem/1.4 var(--kai); color: var(--pencil); cursor: pointer; padding: 2px 6px; }
.dt-dg ol { list-style: none; counter-reset: dg; margin: 0; padding: 0; }
.dt-dg li { counter-increment: dg; position: relative; padding: 8px 0 8px 28px; border-bottom: 1px dashed #d6d3c8; font-size: .92rem; line-height: 1.7; }
.dt-dg li:last-child { border-bottom: 0; }
.dt-dg li::before { content: counter(dg); position: absolute; left: 2px; top: 8px; font: 700 .76rem/1.9 var(--type); color: var(--pencil); }
.dt-dg a { color: var(--graphite); text-decoration: none; background: linear-gradient(transparent 55%, rgba(244, 255, 66, .7) 55%, rgba(244, 255, 66, .7) 92%, transparent 92%); }

/* ---------- back cover (footer) ---------- */
.dt-cover {
  background-color: var(--kraft);
  background-image:
    repeating-linear-gradient(12deg, rgba(90, 60, 25, .05) 0 1px, transparent 1px 7px),
    repeating-linear-gradient(-34deg, rgba(255, 240, 210, .06) 0 1px, transparent 1px 11px);
  color: var(--kraft-ink);
  padding: 54px 24px 46px;
  font-size: .94rem;
  line-height: 1.8;
}
.dt-cover-in { max-width: 1060px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); gap: 28px 56px; align-items: start; }
.dt-label {
  background: #fbf8ef;
  border-radius: 10px;
  padding: 16px 20px 14px;
  box-shadow: inset 0 0 0 1px rgba(43, 31, 18, .16), 0 2px 0 rgba(43, 31, 18, .12);
}
.dt-label p { margin: 0; }
.dt-label .dt-label-n { font: 700 1.15rem/1.4 var(--serif); padding-bottom: 6px; border-bottom: 1px solid rgba(43, 31, 18, .3); margin-bottom: 8px; }
.dt-label .dt-label-n span { font: 700 .7rem/1 var(--type); letter-spacing: .16em; color: #8b7a62; margin-right: 10px; vertical-align: 2px; }
.dt-label a { color: var(--kraft-ink); }
.dt-cover nav { display: flex; flex-wrap: wrap; gap: 6px 22px; margin-bottom: 14px; }
.dt-cover nav a { color: var(--kraft-ink); font-weight: 600; text-decoration-color: rgba(43, 31, 18, .4); }
.dt-cover nav a:hover { background: rgba(255, 250, 230, .35); }
.dt-cover .dt-risk { margin: 0; max-width: 40em; color: #3a2b1a; }

/* ---------- static pages ---------- */
.dt-sheet-page { padding-top: 64px; min-height: 60vh; }
.dt-sheet-page h1 { margin: 6px 0 26px; font: 700 2.1rem/1.4 var(--serif); color: #1f2126; }
.dt-sheet-page h2 { margin: 44px 0 14px; font: 700 1.36rem/1.5 var(--serif); color: #1f2126; }
.dt-sheet-page h2::before { content: none; }
.dt-pages .dt-tabs a { grid-template-columns: 1fr; padding-left: 38px; min-height: 44px; align-items: center; font-size: .9rem; }
.dt-pages .dt-tabs a::before { content: none; }
[data-page="about"] .dt-pg-about a,
[data-page="contact"] .dt-pg-contact a,
[data-page="privacy"] .dt-pg-privacy a,
[data-page="disclosure"] .dt-pg-disclosure a { transform: translateX(10px); filter: none; font-weight: 650; }

/* 404 */
.dt-lost { text-align: left; }
.dt-lost .dt-big { font: 700 4.4rem/1 var(--type); letter-spacing: .08em; color: rgba(42, 44, 49, .18); margin: 0 0 10px; }

/* ---------- narrower: rail becomes a tab strip on top ---------- */
@media (max-width: 1160px) {
  .dt-desk { display: flex; flex-direction: column; align-items: stretch; max-width: 900px; margin: 0 auto; padding: 0 18px 72px; }
  .dt-desk > main { order: 2; }
  .dt-index {
    order: 1;
    position: sticky;
    top: 0;
    z-index: 6;
    margin: 0 -18px;
    padding: 8px 18px 0;
    max-height: none;
    overflow: visible;
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: linear-gradient(var(--desk) 82%, rgba(231, 226, 212, 0));
  }
  .dt-index-h { display: none; }
  .dt-tabs {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    gap: 4px;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
    padding: 6px 2px 0;
  }
  .dt-tabs::-webkit-scrollbar { display: none; }
  .dt-tabs > li { flex: none; margin: 0; }
  .dt-tabs a {
    display: flex;
    align-items: center;
    gap: 6px;
    min-height: 0;
    max-width: 15em;
    padding: 8px 12px 7px;
    border-radius: 9px 9px 0 0;
    transform: translateY(5px);
    white-space: nowrap;
    background-image: linear-gradient(transparent 5px, rgba(196, 69, 58, .28) 5px, rgba(196, 69, 58, .28) 6px, transparent 6px);
    box-shadow: 0 -1px 0 rgba(0, 0, 0, .04), 0 -3px 8px -6px rgba(60, 40, 10, .4);
  }
  .dt-tabs a > span { display: block; overflow: hidden; text-overflow: ellipsis; }
  .dt-tabs a:hover { transform: translateY(2px); }
  .dt-tabs li.dt-on a { transform: translateY(0); padding-bottom: 12px; }
  .dt-tabs li.dt-read a::after { position: static; margin-left: 2px; }
  .dt-dg-btn { flex: none; margin: 0 0 6px; padding: 6px 11px; }
  .dt-dg-btn .dt-dg-l { display: none; }
  .dt-pages .dt-tabs a { min-height: 0; }
  [data-page] .dt-pages .dt-tabs li a { transform: translateY(5px); }
  [data-page="about"] .dt-pg-about a,
  [data-page="contact"] .dt-pg-contact a,
  [data-page="privacy"] .dt-pg-privacy a,
  [data-page="disclosure"] .dt-pg-disclosure a { transform: translateY(0); padding-bottom: 12px; }
  html { scroll-padding-top: 70px; }
}

@media (max-width: 760px) {
  :root { --gutter: 22px; }
  body { font-size: 1.03rem; line-height: 1.86; }
  .dt-bar { padding: 14px 18px 10px; }
  .dt-brand svg { width: 28px; height: 28px; }
  .dt-brand b { font-size: 1.22rem; }
  .dt-nav a { padding: 4px 9px; }
  .dt-desk { padding: 0 0 56px; }
  .dt-index { margin: 0; padding: 6px 12px 0; }
  .dt-sheet {
    padding: 34px 20px 60px 22px;
    border-radius: 0;
    background-image:
      linear-gradient(var(--grid-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: var(--grid-step) var(--grid-step), var(--grid-step) var(--grid-step);
    background-position: -1px -1px, -1px -1px;
    box-shadow: 0 1px 0 #dad6c9, 0 3px 0 #f4f2ea, 0 4px 0 #d3cfc1, 0 14px 30px -18px rgba(64, 50, 24, .4);
  }
  [data-part="hero"] { padding-top: 0; }
  [data-part="meta"] { position: relative; top: auto; right: auto; display: block; margin-top: 18px; }
  [data-part="meta"]::before { bottom: auto; top: .55em; }
  [data-part="hero"] h1 { font-size: 1.62rem; line-height: 1.42; }
  [data-part="dek"] { font-size: 1.04rem; margin-top: 18px; }
  .dt-photo { margin: 30px -6px 4px; padding: 6px 6px 8px; transform: rotate(-.6deg); }
  .dt-photo img { aspect-ratio: 16 / 9; }
  .dt-photo::before { width: 76px; height: 22px; left: 16px; }
  .dt-photo::after { width: 76px; height: 22px; right: 18px; }
  .dt-sheet section { margin-top: 64px; }
  .dt-sheet section > h2 { font-size: 1.36rem; padding-top: 34px; }
  .dt-sheet section > h2::before { left: -22px; top: 0; width: 54px; padding-left: 22px; }
  ol[data-part="steps"] > li { padding-left: 46px; }
  ol[data-part="steps"] > li::before { left: 0; width: 32px; height: 30px; font-size: 1.08rem; }
  ol[data-part="steps"] > li::after { left: 16px; top: 34px; }
  figure[data-part="shot"] { margin: 26px 0 28px; }
  ol[data-part="steps"] figure[data-part="shot"] { margin-left: -46px; }
  figure[data-part="shot"] img { border-width: 5px; }
  [data-part="note"] { margin-left: 4px; padding: 18px 16px 6px 18px; font-size: 1.04rem; }
  [data-part="warn"] { padding: 46px 16px 4px 18px; }
  [data-part="warn"]::before { left: 16px; top: 8px; width: 30px; height: 30px; }
  .dt-sheet table { font-size: .9rem; }
  .dt-sheet th, .dt-sheet td { padding: 9px 7px; }
  [data-part="cta"] { margin: 64px 2px 8px; padding: 46px 18px 18px; transform: rotate(-.5deg); }
  [data-part="cta"]::before { left: 24px; top: -26px; width: 26px; height: 72px; }
  [data-part="cta"] [data-k="code"] { font-size: 2.2rem; letter-spacing: .08em; }
  [data-part="cta"] a[data-cta] { display: flex; justify-content: center; text-align: center; padding: 14px 16px; }
  #faq summary { padding-left: 40px; }
  #faq summary::before { left: 0; top: 18px; width: 28px; height: 28px; }
  .dt-cover { padding: 40px 18px 36px; }
  .dt-cover-in { grid-template-columns: 1fr; gap: 22px; }
  .dt-sheet-page { padding-top: 40px; }
  .dt-sheet-page h1 { font-size: 1.6rem; }
  .dt-dg { right: 12px; bottom: 12px; }
}

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

@media print {
  body { background: #fff; }
  .dt-index, .dt-bar nav, .dt-dg, .dt-dg-btn { display: none !important; }
  .dt-desk { display: block; padding: 0; }
  .dt-sheet { box-shadow: none; background: #fff; padding: 0; }
  .dt-photo, [data-part="cta"] { transform: none; }
}