/* ==========================================================================
   The Slip — Draw One 籤紙 design language (V2A checkpoint)
   一張真的會有人拿在手上的籤：欄欄有界、字起於頂、版記貼緣、印蓋其上。
   TRUTH RULE: poem text is verbatim DRAW_POOL historical_text; the colophon
   is derived 1:1 from provenance; 「抽一謹錄」/「抽一」 are explicit product
   marks confined to the colophon column. No other product copy wears the
   paper's form. (Full contract: docs/design/the-slip-checkpoint.md)
   FREEZE: once PR #22 lands, change only for functional issues.
   ========================================================================== */

:root {
  --slip-desk: #e9e4d8;
  --slip-paper: #f5efe2;
  --slip-ink: #262119;
  --slip-ink-soft: #57503f;
  --slip-cinnabar: #a63a2b;
  --slip-rule: #4a4234;
}

.slip-wrap {
  position: relative;
  width: min(330px, 100%);
  /* leaves room for the protruding tab */
  margin-top: 92px;
}

/* 簽條：突出紙緣的實體簽（承北港形制，取其位不取其形） */
.slip-tab {
  position: absolute;
  top: 0;
  right: 14px;
  transform: translateY(-86%);
  writing-mode: vertical-rl;
  font-family: "Noto Serif TC", serif;
  font-weight: 650;
  font-size: 19px;
  letter-spacing: 0.1em;
  line-height: 1.12;
  border: 1.5px solid var(--slip-rule);
  border-bottom: 0;
  padding: 8px 6px 10px;
  background: var(--slip-paper);
  filter: url(#slip-rough);
}

.slip {
  position: relative;
  width: 100%;
  min-height: 396px;
  background: var(--slip-paper);
  border: 1.5px solid rgba(58, 51, 40, 0.8);
  box-shadow: 0 1px 3px rgba(38, 33, 25, 0.16);
  padding: 12px;
  animation: slip-settle 420ms cubic-bezier(0.2, 0.8, 0.3, 1);
}

/* 內框：與外框構成雙線版框；套印不完全＝第二道硃砂殘影 */
.slip::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(58, 51, 40, 0.62);
  pointer-events: none;
  filter: url(#slip-rough);
}
.slip::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(166, 58, 43, 0.14);
  transform: translate(0.7px, -0.6px);
  pointer-events: none;
  filter: url(#slip-rough);
}

/* 紙的時間摩擦力：極輕煙燻斑漬（multiply；活的印刷，不是 antique 濾鏡） */
.slip-grime {
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: multiply;
  background:
    radial-gradient(140px 90px at 88% 96%, rgba(72, 58, 38, 0.07), transparent 70%),
    radial-gradient(90px 60px at 6% 3%, rgba(72, 58, 38, 0.05), transparent 70%),
    radial-gradient(24px 18px at 22% 78%, rgba(60, 48, 30, 0.05), transparent 75%),
    radial-gradient(10px 8px at 64% 12%, rgba(60, 48, 30, 0.06), transparent 80%);
}

.slip-cols {
  position: relative;
  display: flex;
  flex-direction: row-reverse;
  justify-content: space-between;
  min-height: 368px;
}

.s-col {
  writing-mode: vertical-rl;
  padding: 14px 6px 12px;
}
.s-col:not(:first-child) {
  border-right: 1px solid rgba(58, 51, 40, 0.34);
}

/* 題名欄（籤本名，最右） */
.s-title {
  font-family: "Noto Serif TC", serif;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.3em;
  line-height: 1.25;
  padding-top: 15px;
}

/* 詩文欄：實物的字是大的——詩就是這張紙的主體 */
.s-poem {
  flex: 1 1 0;
  display: flex;
  justify-content: center;
  font-family: "Noto Serif TC", serif;
  font-size: 40px;
  letter-spacing: 0.09em;
  line-height: 1.05;
  padding: 16px 4px 12px;
}

.s-poem .ch,
.s-title .ch,
.s-colo .ch {
  display: inline-block;
}

/* 版記欄：貼左緣、落款欄式、印蓋於其上 */
.s-colo {
  font-family: "Noto Serif TC", serif;
  font-weight: 500;
  font-size: 10.5px;
  letter-spacing: 0.24em;
  line-height: 1.5;
  color: var(--slip-ink-soft);
  padding: 15px 4px 12px 3px;
  position: relative;
}
.s-colo > span:not(.slip-seal) {
  display: block;
}

/* 印：朱文印——硃砂框硃砂字、微轉、multiply 疊在紙纖維上、墨色不均 */
.slip-seal {
  position: absolute;
  left: 2px;
  bottom: 6px;
  writing-mode: vertical-rl;
  display: grid;
  place-items: center;
  width: 30px;
  height: 38px;
  color: var(--slip-cinnabar);
  border: 2px solid var(--slip-cinnabar);
  border-radius: 2px 3px 2px 3px;
  font-family: "Noto Serif TC", serif;
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  line-height: 1;
  transform: rotate(-2.1deg);
  mix-blend-mode: multiply;
  opacity: 0.88;
  filter: url(#slip-rough);
}
.slip-seal::after {
  content: "";
  position: absolute;
  inset: -2px;
  background:
    radial-gradient(5px 4px at 76% 22%, var(--slip-paper) 40%, transparent 70%),
    radial-gradient(4px 3px at 18% 64%, var(--slip-paper) 35%, transparent 70%),
    radial-gradient(3px 5px at 55% 88%, var(--slip-paper) 30%, transparent 75%);
  opacity: 0.55;
}

@keyframes slip-settle {
  from {
    opacity: 0;
    transform: translateY(-26px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}