/* ==========================================================================
   손자병법 메인 — 열세 편의 서가 (계편과 같은 먹·한지·낙관 언어)
   ========================================================================== */

:root {
  --paper: #f2ece0;
  --paper-2: #e9e1d0;
  --paper-3: #ddd2bb;
  --ink: #1c1a17;
  --ink-2: #3a362f;
  --mute: #766d5f;
  --line: #cdc1a8;
  --red: #b23b25;
  --red-2: #8e2c1a;
  --red-soft: #ecd3c8;
  --good: #2f5d3a;

  --serif: "Noto Serif KR", "Nanum Myeongjo", "Batang", serif;
  --sans: "IBM Plex Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;

  --ease: cubic-bezier(.2, .7, .1, 1);
}

* { box-sizing: border-box; }
html, body { margin: 0; }

body {
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.72 var(--sans);
  letter-spacing: -0.005em;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(1200px 700px at 85% -10%, rgba(178, 59, 37, .06), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(28, 26, 23, .07), transparent 60%),
    repeating-linear-gradient(90deg, transparent 0 119px, rgba(120, 100, 70, .055) 119px 120px);
}

a { color: inherit; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; }

.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--ink); color: var(--paper); padding: 8px 14px; }
.skip:focus { left: 8px; }

.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 90; opacity: .32; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .45  0 0 0 0 .38  0 0 0 0 .28  0 0 0 .35 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

.seal {
  display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 6px; flex: none;
  background: var(--red); color: #f8eee6; font: 900 26px/1 var(--serif);
  box-shadow: inset 0 0 0 2px rgba(255, 240, 230, .18), inset 0 0 12px rgba(80, 10, 0, .35);
  transform: rotate(-3deg);
}
.seal--sm { width: 30px; height: 30px; font-size: 17px; border-radius: 4px; }
.brand-icon { display: block; flex: none; border-radius: 5px; transform: rotate(-3deg); }

/* ---------- 상단 ---------- */
.top {
  position: sticky; top: 0; z-index: 40; height: 60px;
  display: flex; align-items: center; gap: 12px; padding: 0 22px;
  background: linear-gradient(var(--paper) 70%, rgba(242, 236, 224, 0));
}
.brand-t { font: 600 14px/1 var(--sans); letter-spacing: .02em; }
.count { margin-left: auto; font: 500 12px/1 var(--mono); color: var(--mute); }
.count b { color: var(--red); font-weight: 500; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 22px 40px; }

/* ---------- 머리 ---------- */
.hero {
  display: grid; grid-template-columns: minmax(0, 1fr) clamp(180px, 23vw, 264px);
  align-items: center; gap: clamp(24px, 4vw, 56px);
  padding: 52px 8px 48px 0; border-bottom: 1px solid var(--line);
}
.hero-copy { min-width: 0; }
.kicker { margin: 0 0 18px; font: 500 12px/1.4 var(--mono); letter-spacing: .14em; color: var(--red); animation: rise .7s var(--ease) both; }
.hero h1 {
  margin: 0; max-width: 15em; font: 900 clamp(34px, 5.6vw, 64px)/1.18 var(--serif); letter-spacing: -.02em;
  animation: rise .8s .08s var(--ease) both;
}
.hero h1 em { font-style: normal; color: var(--red); }
.lede { margin: 24px 0 0; max-width: 34em; color: var(--ink-2); animation: rise .8s .16s var(--ease) both; }
.hero-portrait {
  margin: 0; padding: 6px; border: 1px solid var(--line); border-radius: 19px;
  background: var(--paper); transform: rotate(-3deg);
  box-shadow: 0 12px 24px -20px rgba(28, 26, 23, .45);
}
.hero-portrait img {
  display: block; width: 100%; height: auto; aspect-ratio: 1; border-radius: 13px;
}

/* ---------- 이어서 학습 ---------- */
.resume { margin-top: 28px; animation: rise .7s .25s var(--ease) both; }
.resume-in {
  display: flex; align-items: center; gap: 16px; padding: 16px 20px; text-decoration: none;
  background: var(--ink); color: var(--paper); border-radius: 10px;
  transition: transform .25s var(--ease), box-shadow .25s;
}
.resume-in:hover { transform: translateY(-2px); box-shadow: 0 12px 26px -14px rgba(28, 26, 23, .7); }
.resume-t { display: grid; gap: 2px; min-width: 0; flex: 1; }
.resume-t small { font: 500 11px/1.3 var(--mono); letter-spacing: .1em; color: #c8bca6; }
.resume-t b { font: 600 17px/1.4 var(--serif); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.resume-p { font: 500 14px/1 var(--mono); color: #e9a08f; }
.resume-go { font-weight: 600; font-size: 15px; white-space: nowrap; }

/* ---------- 부 ---------- */
.parts { outline: none; }
.part { margin-top: 52px; }
.part-h { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; padding-bottom: 14px; margin-bottom: 20px; border-bottom: 1px solid var(--ink); }
.part-no { font: 900 22px/1 var(--serif); color: var(--red); }
.part-h h2 { margin: 0; font: 900 26px/1.2 var(--serif); }
.part-h p { margin: 0; color: var(--mute); font-size: 14px; }

.grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }

/* ---------- 편 카드 ---------- */
.card { animation: rise .7s var(--ease) both; animation-delay: calc(.3s + var(--d) * .045s); }
.c-in {
  position: relative; display: flex; flex-direction: column; height: 100%; min-height: 236px;
  padding: 20px 20px 22px; text-decoration: none; overflow: hidden;
  background: rgba(255, 252, 245, .55); border: 1px solid var(--line); border-radius: 10px;
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s, background .3s;
}
.c-head { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 18px; }
.c-no { font: 500 13px/1 var(--mono); color: var(--red); padding-top: 4px; }
.c-seal { transition: transform .45s var(--ease); }
.c-t { margin: 0; font: 900 24px/1.25 var(--serif); }
.c-h { font-weight: 400; font-size: 16px; color: var(--mute); margin-left: 2px; }
.c-theme { margin: 6px 0 14px; font: 600 15px/1.5 var(--serif); color: var(--ink-2); }
.c-keys { list-style: none; margin: 0 0 18px; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.c-keys li { font-size: 12px; line-height: 1; padding: 6px 9px; border: 1px solid var(--line); border-radius: 99px; color: var(--ink-2); }
.c-foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 10px; font-size: 13px; }
.c-state { font-weight: 600; }
.c-min { font: 500 12px/1 var(--mono); color: var(--mute); }
.c-bar { position: absolute; left: 0; right: 0; bottom: 0; height: 4px; background: var(--paper-3); }
.c-bar i { display: block; height: 100%; background: var(--red); transition: width .6s var(--ease); }

.is-ready .c-in { border-color: var(--ink); background: rgba(255, 252, 245, .85); }
.is-ready .c-state { color: var(--red); }
.is-ready .c-state::after { content: " →"; display: inline-block; transition: transform .3s var(--ease); }
.is-ready .c-in:hover { transform: translateY(-4px); box-shadow: 0 18px 32px -20px rgba(28, 26, 23, .55); }
.is-ready .c-in:hover .c-seal { transform: rotate(-9deg) scale(1.08); }
.is-ready .c-in:hover .c-state::after { transform: translateX(4px); }
.is-done .c-state { color: var(--good); }
.is-done .c-state::after { content: " ✓"; }
.is-done .c-bar i { background: var(--good); }

/* 유튜브 본편 링크 — 카드 머리(번호와 낙관 사이)에 얹는다 */
.has-video { position: relative; }
.c-video {
  position: absolute; top: 18px; right: 70px; z-index: 1;
  display: inline-flex; align-items: center; min-height: 32px; padding: 0 12px; border-radius: 99px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink-2); text-decoration: none;
  font: 600 12px/1 var(--sans); transition: border-color .2s, color .2s, background .2s;
}
.c-video:hover, .c-video:focus-visible { border-color: var(--red); color: #fbefe8; background: var(--red); }

.is-soon .c-in { cursor: default; border-style: dashed; background: transparent; }
.is-soon .c-seal { background: transparent; color: var(--mute); box-shadow: inset 0 0 0 1.5px var(--line); }
.is-soon .c-t, .is-soon .c-theme { color: var(--mute); }
.is-soon .c-keys li { color: var(--mute); border-style: dashed; }
.is-soon .c-state { color: var(--mute); font-weight: 500; }

/* ---------- 바닥 ---------- */
.foot { max-width: 1160px; margin: 40px auto 0; padding: 22px 22px 40px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--mute); }
.foot p { margin: 0; }
.foot-reset { background: none; border: 0; padding: 0; color: var(--mute); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; font-size: 13px; }
.foot-reset:hover { color: var(--red); }

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .top, .wrap { padding-left: 16px; padding-right: 16px; }
  .foot { padding-left: 16px; padding-right: 16px; }
  .hero {
    grid-template-columns: minmax(0, 1fr) 80px; align-items: center; gap: 20px 18px;
    padding: 28px 4px 32px 0;
  }
  .hero-copy { display: contents; }
  .hero .kicker { grid-column: 1; grid-row: 1; margin: 0; max-width: 24em; line-height: 1.8; }
  .hero h1 { grid-column: 1 / -1; grid-row: 2; font-size: clamp(26px, 8vw, 34px); }
  .hero .lede { grid-column: 1 / -1; grid-row: 3; margin: 0; }
  .hero-portrait { grid-column: 2; grid-row: 1; padding: 3px; border-radius: 11px; }
  .hero-portrait img { border-radius: 7px; }
  .part { margin-top: 40px; }
  .grid { grid-template-columns: 1fr; gap: 12px; }
  .c-in { min-height: 0; }
  .resume-in { flex-wrap: wrap; gap: 10px 14px; padding: 14px 16px; }
  .resume-in .seal { width: 36px; height: 36px; font-size: 20px; }
  .resume-t b { white-space: normal; }
  .resume-go { margin-left: auto; }
}

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