/* zero-index ต้นแบบเว็บเอกสาร เขียนเองทั้งหมด */

:root {
  color-scheme: light;
  --bg: #fbfbfd;
  --surface: #ffffff;
  --ink: #182033;
  --ink-2: #3f4860;
  --muted: #6c7489;
  --line: #e3e6ef;
  --line-strong: #cbd0de;

  --brand: #2f55d4;
  --brand-2: #2443ad;
  --brand-deep: #182033;
  --brand-soft: #eaf0ff;
  --brand-text: #2b4fc7;
  --accent: #2f55d4;
  --accent-ink: #2443ad;
  --accent-soft: #eaf0ff;

  --grid: rgba(47, 85, 212, .07);

  /* หน้าต่างผลลัพธ์เป็นสีดำเหมือนหน้าต่างจริงของ Windows ทั้งสองโหมด */
  --term-bg: #0c0c0c;
  --term-bar: #262626;
  --term-ink: #d4d4d4;
  --term-dim: #a3a3a3;

  --code-bg: #f5f6fa;
  --code-line: #e3e6ef;
  --code-ink: #26243c;
  --code-gutter: #a3a0b8;
  --syn-kw: #6a33c2;
  --syn-type: #0b7a87;
  --syn-fn: #2453c9;
  --syn-str: #a8500c;
  --syn-esc: #d0700a;
  --syn-num: #c2410c;
  --syn-pre: #b0286a;
  --syn-com: #8a879b;

  --tip: #0f8a6a;
  --note: #2f55d4;
  --warning: #c2410c;
  --info: #0e7490;
  --success: #15803d;
  --danger: #c62828;

  --header-h: 60px;
  --font-text: "Noto Sans Thai", "Leelawadee UI", Tahoma, sans-serif;
  --font-code: "JetBrains Mono", Consolas, "Courier New", monospace;
  --shadow: 0 1px 2px rgba(28, 27, 43, .06), 0 6px 20px rgba(28, 27, 43, .06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #10131b;
    --surface: #161a24;
    --ink: #e6e9f2;
    --ink-2: #b4bacb;
    --muted: #868da2;
    --line: #262b3a;
    --line-strong: #363c50;
    --brand: #7f9cff;
    --brand-2: #9db3ff;
    --brand-deep: #0b0d13;
    --brand-soft: #1d2540;
    --brand-text: #9db3ff;
    --accent: #7f9cff;
    --accent-ink: #9db3ff;
    --accent-soft: #1d2540;
    --grid: rgba(157, 179, 255, .07);
    --code-bg: #141824;
    --code-line: #262b3a;
    --code-ink: #e3e1f2;
    --code-gutter: #625f7c;
    --syn-kw: #c3a3ff;
    --syn-type: #5fd4d8;
    --syn-fn: #8fb4ff;
    --syn-str: #f2b47a;
    --syn-esc: #ffd27a;
    --syn-num: #ff9f73;
    --syn-pre: #f58ab8;
    --syn-com: #7f7c98;
    --tip: #4fd1ad;
    --note: #9db3ff;
    --warning: #fb923c;
    --info: #5bc8e0;
    --success: #4ade80;
    --danger: #ff7b72;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10131b;
  --surface: #161a24;
  --ink: #e6e9f2;
  --ink-2: #b4bacb;
  --muted: #868da2;
  --line: #262b3a;
  --line-strong: #363c50;
  --brand: #7f9cff;
  --brand-2: #9db3ff;
  --brand-deep: #0b0d13;
  --brand-soft: #1d2540;
  --brand-text: #9db3ff;
  --accent: #7f9cff;
  --accent-ink: #9db3ff;
  --accent-soft: #1d2540;
  --grid: rgba(157, 179, 255, .07);
  --code-bg: #141824;
  --code-line: #262b3a;
  --code-ink: #e3e1f2;
  --code-gutter: #625f7c;
  --syn-kw: #c3a3ff;
  --syn-type: #5fd4d8;
  --syn-fn: #8fb4ff;
  --syn-str: #f2b47a;
  --syn-esc: #ffd27a;
  --syn-num: #ff9f73;
  --syn-pre: #f58ab8;
  --syn-com: #7f7c98;
  --tip: #4fd1ad;
  --note: #9db3ff;
  --warning: #fb923c;
  --info: #5bc8e0;
  --success: #4ade80;
  --danger: #ff7b72;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
}

/* ---------- พื้นฐาน ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.85;
  overflow-x: hidden;
}

a { color: var(--brand-text); }

.skip {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 6px 12px;
  background: var(--brand-text);
  color: var(--surface);
  border-radius: 6px;
  font-weight: 600;
}
.skip:focus { top: 10px; }

svg.ic { width: 20px; height: 20px; flex: none; }

/* ---------- แถบหัว ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  color: var(--ink);
}

/* แถบหัวลายกระดาษกราฟ */
.topbar, .drawer-head {
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 16px 16px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 16px 16px,
    var(--surface);
  box-shadow: inset 0 -1px 0 var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  height: 32px;
  padding: 0 7px;
  border-radius: 7px;
  background: var(--brand-text);
  color: var(--surface);
  font-family: var(--font-code);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.02em;
}

.brand-name {
  font-family: var(--font-code);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.topbar-spacer { flex: 1; }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}
.icon-btn:hover { background: var(--brand-soft); }
.icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.menu-btn { display: none; margin-left: -6px; }

.repo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 10px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-code);
  font-size: 13px;
  opacity: .92;
}
.repo:hover { background: var(--brand-soft); opacity: 1; }

/* ไอคอนโหมด แสดงพระจันทร์ตอนสว่าง แสดงพระอาทิตย์ตอนมืด */
.theme-btn .i-sun { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-btn .i-sun { display: block; }
  :root:not([data-theme="light"]) .theme-btn .i-moon { display: none; }
}
:root[data-theme="dark"] .theme-btn .i-sun { display: block; }
:root[data-theme="dark"] .theme-btn .i-moon { display: none; }

/* ---------- โครงสามคอลัมน์ ---------- */

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 260px;
  align-items: start;
}

.main {
  min-width: 0;
  padding: 28px 40px 56px;
}

.doc { max-width: 46rem; margin: 0 auto; }
.pager, .crumbs { max-width: 46rem; margin-left: auto; margin-right: auto; }

/* ---------- สารบัญซ้าย ---------- */

.sidebar {
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 28px 12px 40px 20px;
  border-right: 1px solid var(--line);
}

.drawer-head { display: none; }
.scrim { display: none; }

.nav, .nav ul { list-style: none; margin: 0; padding: 0; }

.nav a {
  display: flex;
  gap: 10px;
  padding: 7px 12px;
  border-radius: 9px;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.55;
}
.nav a:hover { color: var(--ink); background: var(--brand-soft); }

.nav a[aria-current="page"] {
  color: var(--brand-text);
  background: var(--brand-soft);
  font-weight: 600;
}

.nav-section { margin-top: 6px; }
.nav-section.is-open { margin: 14px 0; }
.nav-section:not(.is-open) > ul { display: none; }
.nav .nav-section:not(.is-open) .nav-section-title { color: var(--ink-2); font-weight: 600; }

.nav .nav-section-title {
  font-weight: 700;
  color: var(--ink);
  font-size: 13.5px;
  letter-spacing: .01em;
}
.nav .nav-section-title .num-chip {
  font-family: var(--font-code);
  font-size: 11.5px;
  font-weight: 600;
  padding: 0 7px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  align-self: center;
  line-height: 1.7;
}

.nav-section > ul {
  margin: 4px 0 0 14px;
  padding-left: 8px;
  border-left: 1px solid var(--line);
}

.nav .num {
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--muted);
  padding-top: 1px;
  flex: none;
}
.nav a[aria-current="page"] .num { color: var(--brand-text); }

/* สารบัญในหน้า ซ้อนใต้หน้าปัจจุบัน ใช้เฉพาะจอที่ไม่มีคอลัมน์ขวา */
.toc-inline { display: none; }

/* ---------- สารบัญในหน้า ---------- */

.toc {
  position: sticky;
  top: var(--header-h);
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 32px 20px 40px 8px;
}

.toc-title {
  margin: 0 0 8px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--muted);
}

.toc ul, .toc-inline { list-style: none; margin: 0; padding: 0; }

.toc a, .toc-inline a {
  display: block;
  padding: 4px 0 4px 12px;
  border-left: 2px solid var(--line);
  color: var(--ink-2);
  text-decoration: none;
  font-size: 13.5px;
  line-height: 1.55;
}
.toc-inline a { border-radius: 0; background: none !important; box-shadow: none; }
.toc a.lvl-3, .toc-inline a.lvl-3 { padding-left: 24px; font-size: 13px; }
.toc a:hover, .toc-inline a:hover { color: var(--ink); }
.toc a.is-active, .toc-inline a.is-active {
  color: var(--brand-text);
  border-left-color: var(--brand-text);
  font-weight: 600;
}

/* ---------- เนื้อหา ---------- */

.crumbs {
  font-size: 13.5px;
  color: var(--muted);
  margin-bottom: 4px;
}
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--brand-text); }

.doc h1 {
  font-size: 2.05rem;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 .8em;
}

.doc h2 {
  font-size: 1.42rem;
  line-height: 1.45;
  font-weight: 700;
  margin: 2.2em 0 .6em;
}

.doc h3 {
  font-size: 1.14rem;
  line-height: 1.5;
  font-weight: 700;
  margin: 1.8em 0 .5em;
}

.doc h2, .doc h3 { position: relative; }

.anchor {
  margin-left: .35em;
  color: var(--line-strong);
  text-decoration: none;
  font-weight: 400;
  opacity: 0;
  transition: opacity .15s;
}
.doc h2:hover .anchor, .doc h3:hover .anchor, .anchor:focus { opacity: 1; }
.anchor:hover { color: var(--accent-ink); }

.doc p { margin: 0 0 1em; }

.doc ul, .doc ol { margin: 0 0 1.1em; padding-left: 1.6em; }
.doc li { margin: .25em 0; }
.doc li::marker { color: var(--muted); }
.doc ol > li::marker { font-family: var(--font-code); font-size: .9em; color: var(--brand-text); }

.doc strong { font-weight: 700; }

.doc a { text-underline-offset: 3px; text-decoration-thickness: 1px; }
.doc a:hover { text-decoration-thickness: 2px; }

.doc blockquote {
  margin: 1.2em 0;
  padding: .7em 1.1em;
  border: 1px solid var(--line);
  border-radius: 12px;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 14px 14px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 14px 14px,
    var(--surface);
  color: var(--ink-2);
}
.doc blockquote p:last-child { margin-bottom: 0; }

:not(pre) > code {
  font-family: var(--font-code);
  font-size: .86em;
  padding: .12em .4em;
  border-radius: 5px;
  background: var(--code-bg);
  border: 1px solid var(--code-line);
  color: var(--code-ink);
  overflow-wrap: anywhere;
}

/* ตาราง */
.table-wrap {
  margin: 1.2em 0 1.4em;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.65;
}
.doc th, .doc td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.doc th {
  background: var(--brand-soft);
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}
.doc tr:last-child td { border-bottom: 0; }
.doc tbody tr:hover td { background: var(--bg); }

/* ปุ่มลิงก์ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 10px;
  border: 1.5px solid var(--brand-text);
  color: var(--brand-text);
  background: transparent;
  font-weight: 600;
  font-size: 15.5px;
  text-decoration: none !important;
  line-height: 1.5;
  max-width: 100%;
  overflow-wrap: anywhere;
}
.btn:hover { background: var(--brand-soft); }
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary {
  background: var(--brand-text);
  border-color: var(--brand-text);
  color: var(--surface);
}
.btn-primary:hover { background: var(--brand-2); }

/* ปุ่มคีย์บอร์ด */
.keys { white-space: nowrap; }
kbd {
  display: inline-block;
  min-width: 1.9em;
  padding: 0 .45em;
  font-family: var(--font-code);
  font-size: .8em;
  font-weight: 600;
  line-height: 1.75;
  text-align: center;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-bottom-width: 3px;
  border-radius: 6px;
  vertical-align: .08em;
}
.keys .plus { margin: 0 .15em; color: var(--muted); font-size: .85em; }

/* checkbox รายการ */
.task-list { list-style: none; padding-left: .2em !important; }
.task-list label { display: flex; gap: 12px; align-items: flex-start; cursor: pointer; }
.task-list input {
  appearance: none;
  -webkit-appearance: none;
  flex: none;
  width: 20px;
  height: 20px;
  margin: 6px 0 0;
  border: 2px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
}
.task-list input:checked {
  border-color: var(--brand-text);
  background: var(--brand-text) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / 14px no-repeat;
}
.task-list input:focus-visible { outline: 2px solid var(--brand-text); outline-offset: 2px; }
.task-list input:checked + span { color: var(--muted); }

/* หน้าที่ติ๊กเช็กลิสต์ครบแล้ว ขึ้นเครื่องหมายถูกในเมนูซ้าย */
.nav a.is-done::after {
  content: "";
  flex: none;
  align-self: center;
  width: 16px;
  height: 16px;
  margin-left: auto;
  background: var(--success);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / contain no-repeat;
}

/* แถบท้ายเว็บ ลิงก์แก้หน้านี้และวันที่แก้ล่าสุด */
.site-footer .page-meta { margin-bottom: 6px; white-space: pre-wrap; font-size: 13px; }
.site-footer .page-meta a { color: var(--brand-text); }

/* กล่องเตือน หัวข้อฝังอยู่บนเส้นกรอบ */
.adm {
  --c: var(--note);
  position: relative;
  margin: 2em 0 1.4em;
  padding: 18px 18px 4px;
  border: 1.5px solid color-mix(in srgb, var(--c) 40%, var(--line));
  border-radius: 12px;
  background: var(--surface);
  font-size: 16px;
}
.adm-title {
  position: absolute;
  top: -.95em;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 !important;
  padding: 0 8px;
  background: var(--bg);
  color: var(--c);
  font-size: 15px;
  line-height: 1.7;
  font-weight: 700;
}
.adm-title::before {
  content: "";
  flex: none;
  width: 20px;
  height: 20px;
  background: var(--c);
  -webkit-mask: var(--icon) center / contain no-repeat;
  mask: var(--icon) center / contain no-repeat;
}
.adm.title-only { padding: 14px 18px; }
.adm.title-only .adm-title { position: static; padding: 0; background: none; }

.adm-tip {
  --c: var(--tip);
  --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2a7 7 0 0 0-4 12.74V17a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1v-2.26A7 7 0 0 0 12 2zm-3 18h6v1a1 1 0 0 1-1 1h-4a1 1 0 0 1-1-1v-1z'/%3E%3C/svg%3E");
}
.adm-note {
  --c: var(--note);
  --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M4 3h11l5 5v13H4V3zm10 1.5V9h4.5L14 4.5zM7 12v2h10v-2H7zm0 4v2h7v-2H7z'/%3E%3C/svg%3E");
}
.adm-warning {
  --c: var(--warning);
  --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2 1 21h22L12 2zm-1 7h2v6h-2V9zm0 8h2v2h-2v-2z'/%3E%3C/svg%3E");
}
.adm-info {
  --c: var(--info);
  --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2a10 10 0 1 0 0 20 10 10 0 0 0 0-20zm-1 5h2v2h-2V7zm0 4h2v6h-2v-6z'/%3E%3C/svg%3E");
}
.adm-success {
  --c: var(--success);
  --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2a10 10 0 1 0 0 20 10 10 0 0 0 0-20zm-1.5 14.5-4.5-4.5 1.4-1.4 3.1 3.1 6.6-6.6L18.5 8l-8 8.5z'/%3E%3C/svg%3E");
}

/* กล่องจองภาพหน้าจอ */
.shot {
  margin: 1.4em 0;
  padding: 26px 18px 22px;
  border: 2px dashed var(--line-strong);
  border-radius: 14px;
  text-align: center;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.65;
  background:
    repeating-linear-gradient(135deg, transparent 0 14px, color-mix(in srgb, var(--line) 45%, transparent) 14px 15px),
    var(--surface);
}
.shot::before {
  content: "ภาพหน้าจอ";
  display: block;
  margin-bottom: 4px;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ink-2);
}

/* ---------- code block ---------- */

.code {
  position: relative;
  margin: 1.2em 0 1.4em;
  border: 1px solid var(--code-line);
  border-radius: 12px;
  background: var(--code-bg);
}

.code pre {
  margin: 0;
  padding: 14px 52px 14px 18px;
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: 14px;
  line-height: 1.7;
  color: var(--code-ink);
  tab-size: 4;
}
.code code { font-family: inherit; }

.code[data-linenums] pre { padding-left: 0; counter-reset: ln; }
.code[data-linenums] .ln::before {
  counter-increment: ln;
  content: counter(ln);
  display: inline-block;
  position: sticky;
  left: 0;
  width: 3em;
  padding-right: 1em;
  margin-right: 1em;
  text-align: right;
  color: var(--code-gutter);
  background: var(--code-bg);
  border-right: 1px solid var(--code-line);
  user-select: none;
}

.tk-kw { color: var(--syn-kw); font-weight: 600; }
.tk-type { color: var(--syn-type); font-weight: 600; }
.tk-fn { color: var(--syn-fn); }
.tk-str { color: var(--syn-str); }
.tk-esc { color: var(--syn-esc); font-weight: 600; }
.tk-num { color: var(--syn-num); }
.tk-pre { color: var(--syn-pre); font-weight: 600; }
.tk-hdr { color: var(--syn-str); }
.tk-com { color: var(--syn-com); font-style: italic; }

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--code-line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  opacity: .75;
}
.code:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--brand-text); }
.copy-btn svg { width: 17px; height: 17px; }
.copy-btn .i-check { display: none; }
.copy-btn.is-done { color: var(--success); opacity: 1; }
.copy-btn.is-done .i-copy { display: none; }
.copy-btn.is-done .i-check { display: block; }

/* ปุ่มลองรันอยู่ซ้ายของปุ่มคัดลอก เปิดโค้ดในตัวรันบนเว็บ */
.run-link {
  position: absolute;
  top: 8px;
  right: 48px;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--code-line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  opacity: .75;
}
.code:hover .run-link, .run-link:focus-visible { opacity: 1; }
.run-link:hover { color: var(--brand-text); }
.run-link svg { width: 15px; height: 15px; }

/* วงกลมคำอธิบายโค้ด */
.anno-btn {
  display: inline-grid;
  place-items: center;
  width: 1.45em;
  height: 1.45em;
  margin-left: .2em;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--brand-text);
  color: var(--surface);
  font-family: var(--font-code);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  vertical-align: .05em;
  cursor: pointer;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent);
  transition: transform .12s, background .12s;
}
.anno-btn:hover { transform: scale(1.12); }
.anno-btn[aria-expanded="true"] { background: var(--ink); color: var(--surface); }
.anno-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.anno-pop {
  position: absolute;
  z-index: 20;
  width: min(340px, calc(100% - 16px));
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
  font-family: var(--font-text);
  font-size: 15px;
  line-height: 1.75;
}
.anno-pop[hidden] { display: none; }

/* หัวข้อขั้นตอน ตัวเลขอยู่ในช่องสี่เหลี่ยมเหมือนช่องกระดาษกราฟ */
.doc h2.step {
  display: flex;
  align-items: center;
  gap: .6em;
}
.step-label {
  flex: none;
  display: inline-grid;
  place-items: center;
  min-width: 1.75em;
  height: 1.75em;
  padding: 0 .3em;
  border: 1.5px solid var(--brand-text);
  border-radius: 8px;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 8px 8px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 8px 8px,
    var(--brand-soft);
  color: var(--brand-text);
  font-family: var(--font-code);
  font-size: .85em;
  font-weight: 600;
  line-height: 1;
}
.step-word {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ผลลัพธ์จากโปรแกรม หน้าตาเหมือนหน้าต่างสีดำที่ Code::Blocks เปิดให้ */
.code[data-lang="output"] {
  overflow: hidden;
  border-color: var(--term-bar);
  background: var(--term-bg);
}
.code[data-lang="output"]::before {
  content: attr(data-title);
  display: block;
  padding: 6px 96px 6px 14px;
  background: var(--term-bar);
  color: var(--term-dim);
  font-family: var(--font-code);
  font-size: 12.5px;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.code[data-lang="output"]::after {
  content: "\2013\2002\25A1\2002\2715";
  position: absolute;
  top: 6px;
  right: 14px;
  color: var(--term-dim);
  font-size: 12.5px;
  line-height: 1.5;
}
.code[data-lang="output"] pre { color: var(--term-ink); tab-size: 8; }  /* หน้าต่างดำของ Windows หยุด tab ทุก 8 ตัวอักษร */

/* ข้อความจาก compiler */
.code[data-lang="gcc"] { background: var(--surface); }
.code[data-lang="gcc"]::before {
  content: "ข้อความจาก compiler";
  display: block;
  padding: 6px 14px;
  border-bottom: 1px solid var(--code-line);
  border-radius: 12px 12px 0 0;
  background: var(--code-bg);
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.5;
}
.code[data-lang="gcc"] .copy-btn { top: 42px; }
.tk-loc { color: var(--ink); font-weight: 600; }
.tk-sev-error, .tk-caret { color: var(--danger); font-weight: 700; }
.tk-sev-warning { color: var(--warning); font-weight: 700; }
.tk-sev-note { color: var(--note); font-weight: 700; }
.tk-gutter { color: var(--code-gutter); }
.tk-fix { color: var(--success); font-weight: 700; }

/* แบบฝึกหัด กล่องข้อมูลเข้ากับผลลัพธ์ที่ต้องได้วางคู่กัน */
.ex-title { scroll-margin-top: calc(var(--header-h) + 16px); }
.doc .ex-meta {
  margin: -.4em 0 .9em;
  color: var(--muted);
  font-size: 14px;
  white-space: pre;
}
.io {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin: 1.2em 0 1.4em;
}
.io > .code { margin: 0; min-width: 0; }
.code[data-lang="input"], .code[data-lang="expected"] { background: var(--surface); }
.code[data-lang="input"]::before, .code[data-lang="expected"]::before {
  content: attr(data-title);
  display: block;
  padding: 6px 14px;
  border-bottom: 1px solid var(--code-line);
  border-radius: 12px 12px 0 0;
  background: var(--code-bg);
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.5;
}
.code[data-lang="input"] .copy-btn, .code[data-lang="expected"] .copy-btn { top: 42px; }

details.reveal {
  margin: .8em 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
details.reveal > summary {
  padding: 10px 16px;
  color: var(--brand-text);
  font-weight: 600;
  cursor: pointer;
  list-style-position: inside;
}
details.reveal[open] > summary { border-bottom: 1px solid var(--line); }
details.reveal > :not(summary) { margin: 14px 16px; }
details.reveal > .code { margin: 14px 16px; }

/* แผนภาพ compiler */
.flow {
  display: flex;
  align-items: stretch;
  margin: 1.4em 0 1.6em;
  padding: 22px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}
.flow-node {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 12px 8px;
  border-radius: 11px;
  border: 1.5px solid var(--line-strong);
  background: var(--bg);
  text-align: center;
  line-height: 1.45;
}
.flow-node .fn-main { font-family: var(--font-code); font-weight: 600; font-size: 14.5px; }
.flow-node .fn-sub { font-size: 13px; color: var(--muted); }
.flow-src { border-style: dashed; }
.flow-tool { background: var(--brand-text); border-color: var(--brand-text); color: var(--surface); }
.flow-tool .fn-sub { color: color-mix(in srgb, var(--surface) 80%, transparent); }
.flow-exe { background: var(--brand-soft); border-color: var(--brand-text); }
.flow-run { flex-grow: .7; background: var(--surface); border-color: var(--brand-text); }
.flow-run .fn-main { font-family: var(--font-text); color: var(--brand-text); }
.flow-arrow {
  flex: 0 0 34px;
  align-self: center;
  position: relative;
  height: 2px;
  margin: 0 4px;
  background: var(--muted);
}
.flow-arrow::after {
  content: "";
  position: absolute;
  right: -2px;
  top: -5px;
  border: 6px solid transparent;
  border-left: 8px solid var(--muted);
  border-right: 0;
}

/* ---------- ปุ่มก่อนหน้า ถัดไป ---------- */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.pager a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  transition: border-color .15s, box-shadow .15s, transform .15s;
  min-width: 0;
}
.pager a:hover {
  border-color: var(--brand-text);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.pager .next { grid-column: 2; justify-content: flex-end; text-align: right; }
.pager .pg-text { min-width: 0; display: flex; flex-direction: column; }
.pager .pg-label { font-size: 12.5px; color: var(--muted); }
.pager .pg-title { font-weight: 600; line-height: 1.5; color: var(--brand-text); }
.pager svg { width: 22px; height: 22px; flex: none; color: var(--accent-ink); }

/* ---------- ท้ายเว็บ ---------- */

.site-footer {
  padding: 26px 16px;
  background: var(--surface);
  color: var(--muted);
  text-align: center;
  font-size: 14px;
  box-shadow: inset 0 1px 0 var(--line);
}
.site-footer p { margin: 0; }
.site-footer .mono { font-family: var(--font-code); color: var(--ink); }

/* ---------- หน้าแรก ---------- */

.page-home .doc h1 { font-size: 2.35rem; margin-bottom: .4em; }

.lead { font-size: 1.12rem; color: var(--ink-2); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 1.4em 0 0 !important;
}

/* แผนที่คอร์ส แต่ละบทคือช่องหนึ่งช่องในอาเรย์ */
.course-map { margin: 1.2em 0 1.8em; }

.track-title {
  margin: 1.2em 0 .5em !important;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
}

.doc .cells {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.doc .cell { margin: 0; }

.cell > a, .cell > div {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-content: start;
  column-gap: 10px;
  height: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
}
.cell-index {
  grid-row: 1 / span 3;
  color: var(--brand-text);
  font-family: var(--font-code);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.75;
}
.cell-title { font-weight: 700; line-height: 1.6; }
.cell-sum { color: var(--muted); font-size: 13.5px; line-height: 1.6; }
.cell-meta {
  margin-top: 8px;
  color: var(--muted);
  font-family: var(--font-code);
  font-size: 12px;
}

.is-ready > a {
  border: 1.5px solid var(--brand-text);
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 14px 14px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 14px 14px,
    var(--surface);
  transition: box-shadow .15s, transform .15s;
}
.is-ready > a:hover { box-shadow: var(--shadow); transform: translateY(-1px); }
.is-ready .cell-meta { color: var(--brand-text); font-weight: 600; }

.is-planned > div { border-style: dashed; background: transparent; }
.is-planned .cell-index { color: var(--muted); }
.is-planned .cell-title { color: var(--ink-2); font-weight: 600; }

/* ---------- จอกลาง ไม่มีคอลัมน์ขวา ---------- */

@media (max-width: 1219px) {
  .layout { grid-template-columns: 290px minmax(0, 1fr); }
  .toc { display: none; }
  .toc-inline:not(:empty) {
    display: block;
    margin: 4px 0 8px 12px;
  }
  .main { padding: 28px 32px 56px; }
}

/* ---------- จอแคบ สารบัญซ้ายพับเป็นเมนู ---------- */

@media (max-width: 959px) {
  .layout { display: block; }
  .menu-btn { display: inline-grid; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 60;
    width: min(310px, 86vw);
    height: auto;
    padding: 0 0 32px;
    border-right: 0;
    background: var(--surface);
    box-shadow: var(--shadow);
    transform: translateX(-105%);
    transition: transform .22s ease;
    visibility: hidden;
  }
  .nav-open .sidebar { transform: none; visibility: visible; }

  .drawer-head {
    display: flex;
    align-items: center;
    gap: 10px;
    height: var(--header-h);
    padding: 0 8px 0 16px;
    color: var(--ink);
    margin-bottom: 16px;
  }
  .drawer-head .brand { flex: 1; }
  .nav { padding: 0 12px; }

  .scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 50;
    background: rgba(12, 11, 30, .45);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s;
  }
  .nav-open .scrim { opacity: 1; pointer-events: auto; }
  .nav-open { overflow: hidden; }

  .main { padding: 20px 16px 48px; }
}

@media (max-width: 599px) {
  body { font-size: 16px; }
  .repo span { display: none; }
  .doc h1, .page-home .doc h1 { font-size: 1.6rem; }
  .doc h2 { font-size: 1.28rem; }
  .doc h3 { font-size: 1.08rem; }
  .doc table { font-size: 14px; }
  .doc th, .doc td { padding: 8px 10px; }
  .doc th { white-space: normal; }
  .code pre { font-size: 13px; padding-right: 46px; }

  .flow { flex-direction: column; padding: 16px; }
  .flow-node { flex: none; }
  .flow-arrow {
    flex: 0 0 22px;
    width: 2px;
    height: 22px;
    margin: 4px 0;
  }
  .flow-arrow::after {
    right: auto;
    left: -5px;
    top: auto;
    bottom: -2px;
    border: 6px solid transparent;
    border-top: 8px solid var(--muted);
    border-bottom: 0;
  }

  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
}

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