/* โทเคนทั้งหมดมาจาก DESIGN.md */
:root {
  --desk: #EEF1F6; --sheet: #FFFFFF; --ink: #1C2130; --pencil: #2343C8; --marker: #FFE15A;
  --muted: #5A6377; --rule: #D5DAE4; --ok: #1D7748; --warn: #9A6200; --bad: #B42318;
  --on-pencil: #FFFFFF;
  --r-sm: 6px; --r-md: 10px;
  --f-head: "IBM Plex Sans Thai", "Noto Sans Thai", sans-serif;
  --f-body: "Noto Sans Thai", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --desk: #12151C; --sheet: #1A1E27; --ink: #E6E9F0; --pencil: #93A6FF; --marker: #6B5A00;
    --muted: #9BA3B6; --rule: #2C3240; --ok: #62D49B; --warn: #F0B847; --bad: #FF8A80;
    --on-pencil: #10162E;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--desk); color: var(--ink);
  font: 400 16px/1.7 var(--f-body);
  background-image: radial-gradient(var(--rule) 1px, transparent 1.2px);
  background-size: 22px 22px;
}
a { color: var(--pencil); text-underline-offset: 3px; }
h1, h2, h3, .h-page, .h-sec { font-family: var(--f-head); font-weight: 700; line-height: 1.35; letter-spacing: -0.01em; }
h1 { font-size: clamp(30px, 6vw, 48px); margin: 40px 0 16px; }
h2 { font-size: 22px; margin: 40px 0 8px; }
.h-page { font-size: 28px; margin: 0 0 8px; }
.h-sec { font-size: 18px; margin: 0 0 12px; }
.small { font-size: 14px; color: var(--muted); }
.mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }
.hint { color: var(--muted); margin: 0 0 16px; max-width: 70ch; }
:focus-visible { outline: 2px solid var(--pencil); outline-offset: 2px; }

/* แถบบน */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 12px 24px; background: var(--sheet); border-bottom: 1px solid var(--rule);
}
.logo { font-family: var(--f-head); font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
.logo span { font-family: var(--f-body); font-weight: 400; font-size: 14px; color: var(--muted); margin-left: 8px; }
.topnav { display: flex; align-items: center; gap: 4px 16px; flex-wrap: wrap; }
.topnav a, .linkbtn { color: var(--ink); text-decoration: none; font-size: 15px; }
.topnav a:hover, .linkbtn:hover { color: var(--pencil); }
.topnav a[aria-current="page"] { color: var(--pencil); font-weight: 600; text-decoration: underline; text-underline-offset: 6px; }
.topnav form { margin: 0; }
.linkbtn { background: none; border: 0; padding: 4px 0; font: inherit; cursor: pointer; transition: color 150ms ease-out; }
.linkbtn.danger { color: var(--bad); font-size: 14px; }

/* หน้าอ่าน */
.read { max-width: 720px; margin: 0 auto; padding: 0 16px 48px; }
.wide { max-width: 1200px; margin: 0 auto; padding: 32px 16px 48px; }
.lede { font-size: 18px; color: var(--muted); max-width: 62ch; }
.steps-list { padding-left: 24px; }
.steps-list li { margin: 8px 0; padding-left: 4px; }
.steps-list li::marker { font-family: var(--f-mono); color: var(--pencil); }
.foot { font-size: 14px; }

/* แผ่นงาน */
.sheet { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 24px; margin: 0 0 24px; }
.form-sheet { margin-top: 32px; }
.form-sheet h2 { margin-top: 0; }

/* ฟอร์ม */
label { display: block; font-weight: 600; font-size: 15px; margin: 16px 0 6px; }
label:first-child { margin-top: 0; }
input:not([type=checkbox]):not([type=radio]), select, textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--sheet);
  border: 1px solid var(--rule); border-radius: var(--r-sm); padding: 10px 12px; line-height: 1.6;
  transition: border-color 150ms ease-out;
}
input:hover, select:hover, textarea:hover { border-color: var(--muted); }
input[aria-invalid="true"] { border-color: var(--bad); }
textarea { resize: vertical; }
.field-err { color: var(--bad); font-size: 14px; margin: 4px 0 0; }
.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.check input { margin-top: 6px; width: 18px; height: 18px; flex: none; accent-color: var(--pencil); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.row2 label { margin-top: 16px; }
fieldset { border: 0; padding: 0; margin: 16px 0 0; }
legend { font-weight: 600; font-size: 15px; margin-bottom: 6px; padding: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips legend { width: 100%; }
.chips label { display: inline-flex; align-items: center; gap: 8px; margin: 0; font-weight: 400; border: 1px solid var(--rule); border-radius: var(--r-sm); padding: 6px 12px; cursor: pointer; transition: border-color 150ms ease-out; }
.chips label:hover { border-color: var(--pencil); }
.chips input { accent-color: var(--pencil); }
.keyrow { display: flex; gap: 8px; }
.keyrow input { font-family: var(--f-mono); }

/* ปุ่ม */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 600 15px/1.4 var(--f-body); padding: 10px 18px; margin-top: 16px;
  border-radius: var(--r-sm); border: 1px solid var(--pencil); background: var(--sheet); color: var(--pencil);
  text-decoration: none; cursor: pointer; transition: background-color 150ms ease-out, color 150ms ease-out;
}
.btn:hover { background: color-mix(in srgb, var(--pencil) 10%, var(--sheet)); }
.btn.primary { background: var(--pencil); color: var(--on-pencil); }
.btn.primary:hover { background: color-mix(in srgb, var(--pencil) 85%, var(--ink)); }
.btn[disabled] { opacity: 0.65; cursor: progress; }
.keyrow .btn { margin-top: 0; }
.btn.next { margin-top: 0; }

/* ข้อความระบบ */
.msg { border-radius: var(--r-sm); padding: 10px 14px; margin: 0 0 16px; border: 1px solid; font-size: 15px; }
.msg.ok { color: var(--ok); border-color: currentColor; background: color-mix(in srgb, var(--ok) 8%, var(--sheet)); }
.msg.warn { color: var(--warn); border-color: currentColor; background: color-mix(in srgb, var(--warn) 8%, var(--sheet)); }
.msg.bad { color: var(--bad); border-color: currentColor; background: color-mix(in srgb, var(--bad) 8%, var(--sheet)); }
.msg a { color: inherit; font-weight: 600; }
.empty { color: var(--muted); padding: 16px 0; list-style: none; }

/* แอป */
.shell { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 32px; max-width: 1200px; margin: 0 auto; padding: 32px 24px 64px; }
.rail { position: sticky; top: 16px; align-self: start; display: flex; flex-direction: column; gap: 2px; }
.rail a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: var(--r-sm); color: var(--ink); text-decoration: none; transition: background-color 150ms ease-out; }
.rail a:hover { background: var(--sheet); }
.rail a[aria-current="page"] { background: var(--sheet); color: var(--pencil); font-weight: 600; box-shadow: inset 0 0 0 1px var(--rule); }
.rail .n { font-family: var(--f-mono); font-size: 13px; width: 24px; height: 24px; display: inline-grid; place-items: center; border: 1px solid currentColor; border-radius: 50%; flex: none; }
.rail-reset { margin-top: 12px; text-align: left; padding-left: 10px; color: var(--muted); font-size: 14px; }
.work { min-width: 0; max-width: 820px; }
.ctx p { margin: 0 0 8px; }
.ctx .missing { color: var(--warn); }
.out { margin: 0 0 24px; }
.out:empty { margin: 0; }
.pick-own { margin-top: 0; }

/* รายการให้เลือก + ลูกเล่นเด่น: ปากกาเน้นข้อความ */
.picks { list-style: none; padding: 0; margin: 8px 0 0; background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); }
.picks li + li { border-top: 1px solid var(--rule); }
.pick { width: 100%; text-align: left; background: none; border: 0; padding: 12px 16px; font: inherit; color: var(--ink); cursor: pointer; transition: background-color 150ms ease-out; }
.pick:hover { background: color-mix(in srgb, var(--pencil) 5%, var(--sheet)); }
.pick span {
  background-image: linear-gradient(var(--marker), var(--marker));
  background-repeat: no-repeat; background-position: 0 85%; background-size: 0% 70%;
  transition: background-size 180ms ease-out; padding: 0 2px;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
.pick.on span { background-size: 100% 70%; }
.pick.on { font-weight: 600; }
@media (prefers-reduced-motion: reduce) { .pick span { transition: none; } * { scroll-behavior: auto !important; } }

.result { font-size: 15px; background: var(--sheet); }
.copybar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.copybar .btn { margin-top: 0; }
.copybar .mono { margin-left: auto; }

/* โหลด */
.skeleton { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 16px; }
.skeleton span { display: block; height: 14px; margin: 10px 0; border-radius: 4px; background: var(--rule); animation: pulse 1.2s ease-in-out infinite; }
.skeleton span:nth-child(2n) { width: 82%; } .skeleton span:nth-child(3n) { width: 64%; }
@keyframes pulse { 50% { opacity: 0.45; } }
@media (prefers-reduced-motion: reduce) { .skeleton span { animation: none; } }

/* คลัง */
.lib-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chipbtn { font: inherit; font-size: 14px; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); cursor: pointer; transition: border-color 150ms ease-out; }
.chipbtn:hover { border-color: var(--pencil); }
.chipbtn[aria-pressed="true"] { border-color: var(--pencil); color: var(--pencil); font-weight: 600; }
.lib { list-style: none; padding: 0; margin: 0 0 24px; background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); }
.lib li { padding: 16px; }
.lib li + li { border-top: 1px solid var(--rule); }
.lib h3 { font-size: 16px; margin: 4px 0; display: inline; margin-left: 8px; }
.ptext { margin: 6px 0 0; color: var(--muted); font-size: 15px; }
.tag { font-family: var(--f-mono); font-size: 12px; color: var(--pencil); border: 1px solid currentColor; border-radius: 4px; padding: 0 6px; }

/* ประวัติ */
.hist { list-style: none; padding: 0; margin: 0 0 16px; background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); }
.hist > li + li { border-top: 1px solid var(--rule); }
.hist details { padding: 12px 16px; }
.hist summary { cursor: pointer; display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.hist .ttl { flex: 1; min-width: 12ch; }
.histtext { white-space: pre-wrap; font-size: 15px; }
.hist .empty { padding: 16px; }

.howto { border: 1px dashed var(--rule); border-radius: var(--r-sm); padding: 8px 14px; margin: 16px 0 0; }
.howto summary { cursor: pointer; font-weight: 600; }
.howto ol { padding-left: 22px; margin: 8px 0; }

/* หลังบ้าน */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin: 16px 0 24px; background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); }
.stats div { padding: 12px 16px; } .stats div + div { border-left: 1px solid var(--rule); }
.stats dt { font-size: 14px; color: var(--muted); }
.stats dd { margin: 0; font: 500 28px/1.3 var(--f-mono); font-variant-numeric: tabular-nums; }
.search { display: flex; gap: 8px; align-items: center; margin-bottom: 16px; max-width: 520px; }
.search label { margin: 0; flex: none; }
.search .btn { margin-top: 0; }
.table-wrap { overflow-x: auto; background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--rule); white-space: nowrap; }
th { font-weight: 600; color: var(--muted); }
td.num, th.num { text-align: right; }
tbody tr:hover { background: color-mix(in srgb, var(--pencil) 4%, var(--sheet)); }
td form { margin: 0; }
code { font-family: var(--f-mono); background: var(--desk); padding: 2px 6px; border-radius: 4px; }

/* มือถือ */
@media (max-width: 760px) {
  .topbar { padding: 10px 16px; }
  .shell { grid-template-columns: 1fr; gap: 16px; padding: 12px 16px 48px; }
  .rail { position: static; flex-direction: row; overflow-x: auto; gap: 4px; padding-bottom: 4px; scrollbar-width: thin; }
  .rail a { flex: none; padding: 6px 10px; font-size: 14px; background: var(--sheet); border: 1px solid var(--rule); }
  .rail-reset { flex: none; margin: 0 0 0 4px; white-space: nowrap; }
  .sheet { padding: 16px; }
  .row2 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats div:nth-child(3) { border-left: 0; } .stats div:nth-child(n+3) { border-top: 1px solid var(--rule); }
  h1 { margin-top: 28px; }
}

/* ทำภาพ */
.imgcards .imgcard textarea { font-size: 14px; }
.imgout:empty { display: none; }
.imgout { margin-top: 16px; }
.genimg { display: block; width: 100%; max-width: 420px; height: auto; border-radius: var(--r-md); border: 1px solid var(--rule); }
.imgskel { width: 100%; max-width: 420px; aspect-ratio: 4 / 5; border-radius: var(--r-md); background: var(--rule); animation: pulse 1.2s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) { .imgskel { animation: none; } }

/* แผงรวม + เครื่องมือเสริม */
.rail-h { font-family: var(--f-mono); font-size: 12px; color: var(--muted); margin: 16px 0 4px 10px; letter-spacing: 0.02em; }
.toollist { list-style: none; padding: 0; margin: 0; background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); }
.toollist li { padding: 16px 20px; display: grid; grid-template-columns: 1fr auto; gap: 2px 16px; align-items: baseline; }
.toollist li + li { border-top: 1px solid var(--rule); }
.toollist a { font-family: var(--f-head); font-weight: 700; font-size: 18px; text-decoration: none; }
.toollist a:hover { text-decoration: underline; }
.toollist p { grid-column: 1; margin: 0; color: var(--muted); font-size: 15px; }
.toollist .tag { grid-column: 2; grid-row: 1; white-space: nowrap; }
.help { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 10px 16px; margin: 0 0 16px; }
.help summary { cursor: pointer; font-weight: 600; color: var(--pencil); }
.help ol { padding-left: 22px; margin: 8px 0 0; }
.help .btn { margin: 8px 0 4px; }
.btnrow { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; }
.btnrow .btn { margin-top: 0; }
.row3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 16px; }
input[type=color] { height: 44px; padding: 4px; cursor: pointer; }
input[type=range] { width: 100%; accent-color: var(--pencil); }
input[type=file] { font-size: 14px; }
.swatch { padding-left: 34px; position: relative; }
.swatch::before { content: ""; position: absolute; left: 10px; top: 50%; width: 16px; height: 16px; margin-top: -8px; border-radius: 50%; background: linear-gradient(135deg, var(--sw-bg) 55%, var(--sw-ac) 55%); box-shadow: 0 0 0 1px var(--rule); }
.sledit { margin-top: 16px; display: grid; gap: 12px; }
.slrow { display: grid; gap: 6px; padding: 12px; border: 1px solid var(--rule); border-radius: var(--r-sm); }
.slrow input { font-weight: 600; }
.slrow .linkbtn { justify-self: start; }
.slgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; margin-top: 16px; }
.slgrid figure { margin: 0; }
.slgrid canvas { width: 100%; height: auto; display: block; border-radius: var(--r-sm); border: 1px solid var(--rule); }
.slgrid figcaption { margin-top: 4px; }
.chatlog { display: grid; gap: 12px; margin: 0 0 16px; }
.bubble { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 12px 16px; max-width: 92%; }
.bubble.me { justify-self: end; background: color-mix(in srgb, var(--pencil) 8%, var(--sheet)); }
.bubble .histtext { margin: 4px 0 0; }
.quizq { border-top: 1px solid var(--rule); padding-top: 16px; margin-top: 16px; }
.quizq:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.quizq legend { font-weight: 600; margin-bottom: 8px; }
.quizq .check { margin: 6px 0; }
.bars { display: grid; grid-template-columns: auto 1fr; gap: 10px 16px; align-items: center; margin: 0 0 16px; }
.bars dt { font-size: 15px; }
.bars dd { margin: 0; display: flex; align-items: center; gap: 10px; }
.bar { flex: 1; height: 12px; border-radius: 6px; background: var(--rule); position: relative; overflow: hidden; }
.bar::after { content: ""; position: absolute; inset: 0 auto 0 0; width: var(--w); background: var(--pencil); border-radius: 6px; }
.bar.hot::after { background: var(--warn); }
.plan { padding-left: 0; list-style: none; margin: 8px 0 16px; }
.plan li { border-top: 1px solid var(--rule); padding: 4px 0; }
.plan li.done span { color: var(--muted); text-decoration: line-through; }
.phprev { display: block; width: 96px; height: 96px; object-fit: cover; border-radius: var(--r-sm); margin-top: 8px; border: 1px solid var(--rule); }
.phgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.phcard { margin: 0; }
.phcard figcaption { margin-top: 8px; }
.phcard .btn { margin-top: 0; }
@media (max-width: 760px) {
  .rail-h { display: none; }
  .row3 { grid-template-columns: repeat(3, 1fr); gap: 0 8px; }
  .toollist li { grid-template-columns: 1fr; }
  .toollist .tag { grid-column: 1; grid-row: auto; justify-self: start; margin-top: 6px; }
  .slgrid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
}
.lpframe { margin-top: 16px; border: 1px solid var(--rule); border-radius: var(--r-md); overflow: hidden; background: #fff; }
.lpsec { display: grid; gap: 4px; margin-bottom: 12px; }
.lpsec label { margin: 0; }