/* =========================================================
   นักวิเคราะห์คดีโค้ด — design tokens
   ธีม: แฟ้มคดีนักสืบ x กระดาษกราฟ x ผังงาน (flowchart)
   ========================================================= */
:root {
  --cream: #faf6ee;
  --paper: #fffdf8;
  --paper-edge: #efe8d8;
  --ink: #1f3a5f;
  --ink-soft: #52678a;
  --teal: #1f8a8c;
  --teal-dark: #146264;
  --coral: #e4572e;
  --coral-dark: #b8391a;
  --yellow: #f4b942;
  --line: #d9d2bd;
  --success: #3e8914;
  --danger: #c23b22;

  --font-display: 'Chonburi', 'Sarabun', sans-serif;
  --font-body: 'Sarabun', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-s: 10px;
  --radius-m: 16px;
  --radius-l: 24px;
  --shadow-card: 0 10px 30px -12px rgba(31, 58, 95, 0.28);
  --shadow-soft: 0 4px 14px -6px rgba(31, 58, 95, 0.2);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background-color: var(--cream);
  background-image:
    linear-gradient(rgba(31, 58, 95, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 58, 95, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

::selection { background: var(--yellow); color: var(--ink); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.85em 1.5em;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--coral);
  color: #fff8ef;
  box-shadow: var(--shadow-soft);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 20px -8px rgba(228, 87, 46, 0.55); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--ink-soft); transform: translateY(-2px); }
.btn-disabled { opacity: 0.55; cursor: not-allowed; box-shadow: none; }
.btn-disabled:hover { transform: none; }

/* =========================================================
   HOME — corkboard of case folders
   ========================================================= */
.corkboard {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.board-header { text-align: center; margin-bottom: 3rem; }

.badge-emblem {
  width: 88px; height: 88px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: var(--ink);
  color: var(--yellow);
  display: flex; align-items: center; justify-content: center;
  font-size: 2.1rem;
  box-shadow: var(--shadow-card), 0 0 0 6px var(--paper), 0 0 0 8px var(--ink);
}

.board-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--ink);
  margin: 0 0 0.5rem;
  letter-spacing: 0.01em;
}

.board-subtitle {
  color: var(--ink-soft);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto;
}
.board-subtitle strong { color: var(--coral-dark); }

.method-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 1.75rem;
}
.method-strip span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--teal-dark);
  background: rgba(31, 138, 140, 0.1);
  border: 1px solid rgba(31, 138, 140, 0.3);
  padding: 0.4em 0.9em;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.25rem;
}

.case-folder {
  position: relative;
  display: block;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
  padding-top: 2.4rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.case-folder:hover { transform: translateY(-6px) rotate(-0.5deg); box-shadow: 0 18px 34px -14px rgba(31,58,95,0.35); }

.case-folder .pin {
  position: absolute;
  top: -14px; left: 50%;
  transform: translateX(-50%) rotate(-8deg);
  color: var(--coral);
  font-size: 1.4rem;
  filter: drop-shadow(0 3px 3px rgba(0,0,0,0.25));
}

.folder-tab {
  position: absolute;
  top: -0.1rem; left: 1.25rem;
  transform: translateY(-100%);
  background: var(--ink);
  color: var(--yellow);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  padding: 0.35em 1em;
  border-radius: 8px 8px 0 0;
}

.folder-body { padding: 1rem 1.5rem 1.75rem; }

.folder-icon {
  width: 54px; height: 54px;
  border-radius: 14px;
  background: rgba(228, 87, 46, 0.12);
  color: var(--coral);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 0.9rem;
}

.folder-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin: 0 0 0.35rem;
  color: var(--ink);
}

.folder-teaser {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0 0 1rem;
}

.folder-stars {
  color: var(--yellow);
  font-size: 1.05rem;
  margin-bottom: 1rem;
  letter-spacing: 0.15em;
}
.folder-stars i.fa-solid { color: var(--yellow); }
.folder-stars i.fa-regular { color: var(--line); }

.folder-cta {
  font-weight: 700;
  color: var(--teal-dark);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}

.lock-overlay {
  position: absolute; inset: 0;
  background: rgba(250, 246, 238, 0.93);
  border-radius: var(--radius-m);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  color: var(--ink-soft);
  font-weight: 600;
  text-align: center;
  padding: 1rem;
}
.lock-overlay i { font-size: 1.8rem; color: var(--ink-soft); }
.case-folder.is-locked { pointer-events: none; }
.case-folder.is-locked .lock-overlay { display: flex; }

.board-footer {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin-top: 3rem;
}

/* =========================================================
   MISSION PAGE
   ========================================================= */
.back-link {
  position: fixed;
  top: 1.25rem; left: 1.25rem;
  z-index: 20;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  padding: 0.55em 1.1em;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow-soft);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}
.back-link:hover { transform: translateY(-2px); }

.mission-wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 5rem 1.5rem 5rem;
}

.mission-header { text-align: center; margin-bottom: 2.5rem; }

.case-stamp-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--coral-dark);
  border: 2px dashed var(--coral);
  padding: 0.25em 0.9em;
  border-radius: 999px;
  transform: rotate(-2deg);
  margin-bottom: 0.75rem;
}

.mission-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  margin: 0 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
}
.mission-title i { color: var(--coral); }

.evidence-card {
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-left: 5px solid var(--teal);
  border-radius: var(--radius-s);
  max-width: 720px;
  margin: 0 auto;
  padding: 1.1rem 1.4rem;
  text-align: left;
  box-shadow: var(--shadow-soft);
}
.evidence-heading {
  font-weight: 700;
  color: var(--teal-dark);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: flex; align-items: center; gap: 0.5em;
  margin-bottom: 0.5rem;
}
.evidence-text { margin: 0; font-size: 1.05rem; }

.mission-body {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 820px) {
  .mission-body { grid-template-columns: 1fr; }
}

/* ---------- case trail (signature nav) ---------- */
.case-trail {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-m);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-soft);
}
.trail-line {
  position: absolute;
  left: 2.55rem; top: 2.4rem; bottom: 2.4rem;
  width: 3px;
  background: repeating-linear-gradient(to bottom, var(--line) 0 6px, transparent 6px 12px);
}
@media (max-width: 820px) { .trail-line { display: none; } }

.trail-node {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: none;
  border: none;
  padding: 0.7rem 0.4rem;
  text-align: left;
  cursor: not-allowed;
  color: var(--ink-soft);
  border-radius: var(--radius-s);
  opacity: 0.55;
}
.trail-node.is-unlocked { cursor: pointer; opacity: 1; }
.trail-node.is-unlocked:hover { background: rgba(31, 138, 140, 0.08); }
.trail-node.is-active { background: rgba(228, 87, 46, 0.1); color: var(--ink); }
.trail-node.is-active .trail-icon { background: var(--coral); color: #fff; }

.trail-icon {
  width: 40px; height: 40px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  z-index: 1;
}
.trail-node.is-unlocked .trail-icon { border-color: var(--teal); color: var(--teal-dark); }
.trail-node.is-done .trail-icon { background: var(--success); border-color: var(--success); color: #fff; }

.trail-label { font-size: 0.9rem; font-weight: 600; }
.trail-check { display: none; margin-left: auto; color: var(--success); }
.trail-node.is-done .trail-check { display: inline-block; }

/* ---------- stage card ---------- */
.stage-card {
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-l);
  padding: 2rem 2.25rem 2.25rem;
  box-shadow: var(--shadow-card);
  min-height: 420px;
}
@media (max-width: 600px) { .stage-card { padding: 1.5rem; } }

.stage-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--teal-dark);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.stage-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0.25rem 0 1.5rem;
}

.stage-content { min-height: 160px; }

/* mcq options */
.option-list { display: grid; gap: 0.75rem; }
.option-btn {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-align: left;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius-s);
  border: 2px solid var(--line);
  background: var(--cream);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
}
.option-btn:hover { border-color: var(--teal); transform: translateX(3px); }
.option-btn .opt-mark {
  width: 26px; height: 26px; flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  color: transparent;
}
.option-btn.is-selected { border-color: var(--teal); background: rgba(31,138,140,0.08); }
.option-btn.is-selected .opt-mark { border-color: var(--teal); color: var(--teal); background: #fff; }
.option-btn.is-correct { border-color: var(--success); background: rgba(62,137,20,0.1); }
.option-btn.is-correct .opt-mark { border-color: var(--success); color: #fff; background: var(--success); }
.option-btn.is-wrong { border-color: var(--danger); background: rgba(194,59,34,0.1); animation: shake 0.35s ease; }
.option-btn.is-wrong .opt-mark { border-color: var(--danger); color: #fff; background: var(--danger); }
.option-btn:disabled { cursor: default; }
.option-btn:disabled:hover { transform: none; }

/* variable matching */
.var-list { display: grid; gap: 0.9rem; }
.var-row {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem;
  background: var(--cream);
  border: 2px solid var(--line);
  border-radius: var(--radius-s);
  padding: 0.7rem 1rem;
}
.var-row.is-correct { border-color: var(--success); background: rgba(62,137,20,0.08); }
.var-row.is-wrong { border-color: var(--danger); background: rgba(194,59,34,0.08); }
.var-chip {
  font-family: var(--font-mono);
  font-weight: 700;
  background: var(--ink);
  color: var(--yellow);
  padding: 0.4em 0.9em;
  border-radius: 8px;
  font-size: 0.95rem;
  white-space: nowrap;
}
.var-select {
  width: 100%;
  padding: 0.6em 0.8em;
  border-radius: 8px;
  border: 2px solid var(--line);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: #fff;
  color: var(--ink);
}
.var-select:focus-visible { outline: 2px solid var(--teal); }

/* process ordering + flowchart shapes */
.process-instructions {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 0.9rem;
}
.flow-slots { display: grid; gap: 0.6rem; margin-bottom: 1.5rem; }
.flow-shape {
  position: relative;
  padding: 0.7rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  min-height: 2.4em;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
}
.flow-shape.empty { color: var(--ink-soft); font-style: italic; font-family: var(--font-body); font-weight: 400; }
.flow-shape.terminal { background: var(--cream); border: 2px solid var(--ink-soft); border-radius: 999px; }
.flow-shape.io { background: #fff; border: 2px solid var(--teal); transform: skewX(-8deg); }
.flow-shape.io > span { display: inline-block; transform: skewX(8deg); }
.flow-shape.process { background: #fff; border: 2px solid var(--coral); border-radius: 6px; }
.flow-shape.decision {
  background: #fff;
  border: 2px solid var(--yellow);
  border-radius: 6px;
  transform: rotate(0.001deg);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  padding: 1.4rem 2.2rem;
}
.flow-shape.filled { animation: inkstamp 0.3s ease; }

/* ลูกศรเชื่อมระหว่างกล่องผังงาน (แสดงเฉพาะในโหมดผังงาน) */
.flow-slots.flow-connected .flow-shape:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -0.62rem;
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 10px solid var(--ink-soft);
  transform: translateX(-50%);
  z-index: 2;
}
.flow-slots.flow-connected { gap: 1.1rem; }

.flow-bank { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.flow-pill {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--cream);
  border: 2px solid var(--line);
  border-radius: 999px;
  padding: 0.5em 1em;
  cursor: pointer;
}
.flow-pill:hover { border-color: var(--teal); }
.flow-pill:disabled { opacity: 0.35; cursor: not-allowed; }

/* ---------- รหัสเทียม (pseudocode fill-in-the-blank) ---------- */
.pseudo-editor {
  background: #1f2733;
  border-radius: var(--radius-m);
  padding: 1.2rem 1.4rem;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
}
.pseudo-line {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: #e7ecf5;
  line-height: 2.1;
  white-space: pre-wrap;
}
.pseudo-line .pseudo-indent { display: inline-block; width: 1.6em; }
.pseudo-blank {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  background: #2b3546;
  color: #ffe9b8;
  border: 1px dashed #6b7a99;
  border-radius: 5px;
  padding: 0.1em 0.5em;
  min-width: 5em;
  display: inline-block;
}
.pseudo-blank:focus { outline: none; border-color: var(--yellow); background: #35415a; }
.pseudo-blank.is-correct { border-color: var(--success); border-style: solid; color: #b7f7a8; }
.pseudo-blank.is-wrong { border-color: var(--danger); border-style: solid; }
.pseudo-keyword { color: #7fd6ff; }

.formula-row {
  margin-top: 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  background: var(--cream);
  border: 2px dashed var(--line);
  border-radius: var(--radius-s);
  padding: 0.9rem 1.1rem;
}
.formula-row label {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--coral-dark);
}
.formula-row input {
  font-family: var(--font-mono);
  font-size: 1rem;
  border: 2px solid var(--line);
  border-radius: 8px;
  padding: 0.5em 0.7em;
  flex: 1;
  min-width: 160px;
}
.formula-row input:focus-visible { outline: 2px solid var(--teal); }

/* feedback */
.stage-feedback {
  min-height: 1.6rem;
  margin-top: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.stage-feedback.ok { color: var(--success); }
.stage-feedback.bad { color: var(--danger); }

.stage-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(3px); }
  30%, 50%, 70% { transform: translateX(-5px); }
  40%, 60% { transform: translateX(5px); }
}
@keyframes inkstamp {
  0% { transform: scale(1.35) rotate(-4deg); opacity: 0.3; }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}

/* ---------- solved overlay ---------- */
.solved-overlay {
  position: fixed; inset: 0;
  background: rgba(31, 58, 95, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1.5rem;
}
.solved-overlay.is-visible { display: flex; }

#confettiCanvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

.solved-card {
  position: relative;
  background: var(--paper);
  border-radius: var(--radius-l);
  padding: 2.5rem 2.5rem 2rem;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.5);
}

.stamp-mark {
  display: inline-block;
  border: 4px solid var(--coral);
  color: var(--coral);
  font-family: var(--font-display);
  font-size: 1.15rem;
  padding: 0.4em 1em;
  border-radius: 10px;
  transform: rotate(-8deg) scale(1);
  margin-bottom: 1rem;
  animation: stampdown 0.45s cubic-bezier(.2,1.4,.4,1);
}
@keyframes stampdown {
  0% { transform: rotate(-8deg) scale(2.4); opacity: 0; }
  70% { opacity: 1; }
  100% { transform: rotate(-8deg) scale(1); opacity: 1; }
}

.solved-card h2 {
  font-family: var(--font-display);
  margin: 0.3rem 0 0.5rem;
  color: var(--ink);
}
.solved-card p { color: var(--ink-soft); margin-bottom: 1rem; }

.stars-earned {
  font-size: 1.8rem;
  color: var(--yellow);
  margin-bottom: 1.5rem;
  letter-spacing: 0.2em;
}
.stars-earned i.dim { color: var(--line); }

.solved-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- toast ---------- */
.toast {
  position: fixed;
  bottom: 1.5rem; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink);
  color: var(--yellow);
  font-weight: 600;
  padding: 0.8em 1.3em;
  border-radius: 999px;
  box-shadow: var(--shadow-card);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 60;
  font-size: 0.9rem;
}
.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* =========================================================
   ระบบล็อกอิน (ใช้แค่ชื่อ)
   ========================================================= */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
.login-card {
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
  padding: 2.4rem 2rem;
  max-width: 420px;
  width: 100%;
  text-align: center;
}
.login-card .badge-emblem {
  margin: 0 auto 1rem;
}
.login-title {
  font-family: var(--font-display);
  font-size: 1.7rem;
  color: var(--ink);
  margin: 0 0 0.4rem;
}
.login-sub {
  color: var(--ink-soft);
  margin: 0 0 1.4rem;
  font-size: 0.95rem;
}
.login-error {
  background: rgba(194, 59, 34, 0.1);
  color: var(--danger);
  border: 1px solid rgba(194, 59, 34, 0.3);
  border-radius: var(--radius-s);
  padding: 0.65em 0.9em;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  text-align: left;
}
.login-form {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  text-align: left;
}
.login-form label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.login-form input[type="text"] {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75em 1em;
  border-radius: var(--radius-s);
  border: 2px solid var(--line);
  background: #fff;
  color: var(--ink);
}
.login-form input[type="text"]:focus {
  outline: none;
  border-color: var(--teal);
}
.login-form .btn {
  justify-content: center;
  margin-top: 0.4rem;
}
.login-note {
  margin-top: 1.4rem;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

/* =========================================================
   แถบผู้ใช้ (userbar)
   ========================================================= */
.userbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
  max-width: 900px;
  margin: 0 auto 1rem;
  padding: 0.6em 1em;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: 999px;
  box-shadow: var(--shadow-soft);
  font-size: 0.9rem;
}
.userbar-name {
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.userbar-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.userbar-links a {
  color: var(--ink-soft);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}
.userbar-links a:hover { color: var(--coral); }

/* =========================================================
   บทเรียน "คู่มือนักสืบ" (ต้องเรียนก่อนไขคดี)
   ========================================================= */
.lesson-wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}
.lesson-intro { margin-bottom: 0.2rem; }
.lesson-step {
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-soft);
  padding: 1.2rem 1.4rem;
}
.lesson-step-head {
  display: flex;
  align-items: center;
  gap: 0.8em;
  margin-bottom: 0.4rem;
}
.lesson-step-num {
  flex: none;
  width: 2.1em;
  height: 2.1em;
  border-radius: 50%;
  background: var(--coral);
  color: #fff8ef;
  font-family: var(--font-display);
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lesson-step-head h2 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--ink);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.lesson-step p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.6;
}
.lesson-step code, .example-answer code {
  font-family: var(--font-mono);
  background: rgba(31, 58, 95, 0.08);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  color: var(--teal-dark);
}

.lesson-example .example-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  margin: 1.2rem 0;
}
.example-cell {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  padding: 0.8em 1em;
}
.example-label {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 0.4em;
  margin-bottom: 0.35em;
}
.example-answer { color: var(--ink); }

.example-process { margin-top: 1rem; }
.static-flow .flow-shape { cursor: default; }

.lesson-tip-list {
  margin: 0.6rem 0 0;
  padding-left: 1.2em;
  color: var(--ink-soft);
  line-height: 1.7;
}

.lesson-cta {
  display: flex;
  justify-content: center;
  margin-top: 0.6rem;
}
.btn-lg {
  font-size: 1.05rem;
  padding: 1em 2em;
}

/* =========================================================
   สมัครสมาชิก / สลับไปหน้าล็อกอิน
   ========================================================= */
.login-form input[type="password"] {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75em 1em;
  border-radius: var(--radius-s);
  border: 2px solid var(--line);
  background: #fff;
  color: var(--ink);
}
.login-form input[type="password"]:focus {
  outline: none;
  border-color: var(--teal);
}
.login-switch {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.login-switch a { color: var(--coral); font-weight: 700; }
.login-switch a:hover { text-decoration: underline; }

/* =========================================================
   แผงควบคุมแอดมิน
   ========================================================= */
.admin-page { min-height: 100vh; }
.admin-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem 4rem;
}
.admin-wrap-narrow { max-width: 760px; }
.admin-header { text-align: center; margin: 1.5rem 0 2rem; }
.admin-header .badge-emblem { margin: 0 auto 0.8rem; }
.admin-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--ink);
  margin: 0;
}

.admin-notice {
  background: rgba(31, 138, 140, 0.1);
  border: 1px solid rgba(31, 138, 140, 0.3);
  color: var(--teal-dark);
  border-radius: var(--radius-s);
  padding: 0.8em 1em;
  margin-bottom: 1.2rem;
  font-size: 0.92rem;
}
.admin-notice-warn {
  background: rgba(244, 185, 66, 0.15);
  border-color: rgba(244, 185, 66, 0.4);
  color: #7a5a08;
}
.admin-temp-pass {
  display: inline-block;
  margin-left: 0.5em;
  padding: 0.15em 0.6em;
  background: #fff;
  border: 1px dashed var(--ink-soft);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
}

.admin-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.9rem;
  margin-bottom: 2rem;
}
.admin-stat-card {
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-soft);
  padding: 1.1rem 1rem;
  text-align: center;
}
.admin-stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--coral);
}
.admin-stat-label {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-top: 0.3em;
}

.admin-section { margin-bottom: 2.5rem; }
.admin-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}
.admin-section h2 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--ink);
  display: flex; align-items: center; gap: 0.5em;
  margin: 0 0 0.8rem;
}
.admin-section-head h2 { margin: 0; }

.admin-table-wrap {
  overflow-x: auto;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-soft);
}
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  white-space: nowrap;
}
.admin-table th, .admin-table td {
  text-align: left;
  padding: 0.7em 0.9em;
  border-bottom: 1px solid var(--paper-edge);
}
.admin-table th {
  color: var(--ink-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.admin-table tr:last-child td { border-bottom: none; }
.admin-table code {
  font-family: var(--font-mono);
  background: rgba(31, 58, 95, 0.08);
  padding: 0.1em 0.4em;
  border-radius: 4px;
}
.admin-row-actions { display: flex; gap: 0.4em; }
.admin-inline-form select {
  font-family: var(--font-body);
  padding: 0.3em 0.5em;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #fff;
}

.btn-sm { padding: 0.45em 0.9em; font-size: 0.85rem; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { border-color: var(--danger); }

.mission-form-hint {
  background: rgba(31, 58, 95, 0.06);
  border-radius: var(--radius-s);
  padding: 0.8em 1em;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}
.mission-form-hint code {
  font-family: var(--font-mono);
  background: rgba(31, 58, 95, 0.1);
  padding: 0.1em 0.4em;
  border-radius: 4px;
}
.mission-form {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-soft);
  padding: 1.4rem;
}
.mission-form label {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.mission-form input[type="text"], .mission-form textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.65em 0.85em;
  border-radius: var(--radius-s);
  border: 2px solid var(--line);
  background: #fff;
  color: var(--ink);
  resize: vertical;
}
.mission-form .mono-textarea {
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.mission-form input:focus, .mission-form textarea:focus {
  outline: none;
  border-color: var(--teal);
}
.mission-form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.7rem;
  margin-top: 0.6rem;
}

/* =========================================================
   ต่อบล็อกโค้ดแบบ Scratch (ขั้นที่ 8)
   ========================================================= */
.btn-run { background: #4caf50; color: #fff; border: 2px solid #4caf50; }
.btn-run:hover { transform: translateY(-2px); box-shadow: 0 10px 20px -8px rgba(76, 175, 80, 0.5); }

.block-palette-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin: 0 0 0.5rem;
}
.block-palette { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.2rem; }
.palette-block {
  cursor: grab;
  padding: 0.65em 1.1em;
  border-radius: 10px 10px 10px 3px;
  color: #fff;
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border: none;
  box-shadow: 0 2px 0 rgba(0,0,0,0.2);
  transition: transform 0.15s ease;
}
.palette-block:hover { transform: translateY(-2px); }
.palette-block:active { cursor: grabbing; }
.palette-block.type-input { background: #3b82f6; }
.palette-block.type-set { background: #f59e0b; }
.palette-block.type-output { background: #a855f7; }

.block-stack-label { font-size: 0.85rem; font-weight: 700; color: var(--ink-soft); margin: 0 0 0.5rem; }
.block-cap {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ink-soft);
  background: var(--cream);
  border: 2px solid var(--ink-soft);
  border-radius: 999px;
  padding: 0.35em;
  margin-bottom: 0.5rem;
}
.block-stack {
  background: #eef1f6;
  border-radius: var(--radius-m);
  padding: 1rem;
  min-height: 90px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border: 2px dashed var(--line);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.block-stack.drag-over { border-color: var(--teal); background: #e3f7f7; }
.block-stack-empty { color: var(--ink-soft); font-size: 0.85rem; font-style: italic; text-align: center; padding: 1rem; }

.block-instance {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0.6em 0.9em;
  border-radius: 10px 10px 10px 3px;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  box-shadow: 0 2px 0 rgba(0,0,0,0.15);
}
.block-instance.type-input { background: #3b82f6; }
.block-instance.type-set { background: #f59e0b; }
.block-instance.type-output { background: #a855f7; }
.block-instance .blk-label { white-space: nowrap; }
.block-instance input.blk-field {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border: none;
  border-radius: 5px;
  padding: 0.25em 0.55em;
  min-width: 4.5em;
  background: rgba(255,255,255,0.92);
  color: #1f2733;
}
.block-instance input.blk-field:disabled { opacity: 0.85; }
.block-instance input.blk-field.is-correct { outline: 3px solid #22c55e; }
.block-instance input.blk-field.is-wrong { outline: 3px solid #ef4444; }
.block-controls { margin-left: auto; display: flex; gap: 0.25rem; }
.block-controls button {
  background: rgba(255,255,255,0.28);
  border: none;
  color: #fff;
  width: 24px; height: 24px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.75rem;
  display: flex; align-items: center; justify-content: center;
}
.block-controls button:hover { background: rgba(255,255,255,0.5); }
.block-controls button:disabled { opacity: 0.3; cursor: not-allowed; }

.block-console {
  margin-top: 1.2rem;
  background: #1f2733;
  color: #e7ecf5;
  border-radius: var(--radius-m);
  padding: 1rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  min-height: 60px;
}
.block-console .console-title { color: #9fb0c9; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.4rem; }
.block-console .console-line { line-height: 1.7; }
.block-console .console-line.err { color: #ff8f8f; }
.block-console .console-line.ok { color: #8be28b; }

.run-values-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 0.9rem;
  align-items: flex-end;
  background: rgba(31, 58, 95, 0.05);
  border-radius: var(--radius-s);
  padding: 0.8rem;
}
.run-values-form label {
  display: flex;
  flex-direction: column;
  font-size: 0.78rem;
  color: var(--ink-soft);
  gap: 0.25rem;
  font-weight: 700;
}
.run-values-form input {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.4em 0.6em;
  border-radius: 6px;
  border: 2px solid var(--line);
  width: 6em;
}

/* =========================================================
   ฟอร์มแอดมินแบบกรอกทีละช่อง (ไม่ต้องเขียน JSON)
   ========================================================= */
.form-section {
  background: rgba(31, 58, 95, 0.04);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-s);
  padding: 1.1rem 1.2rem;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.form-section-title {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--ink);
  margin: 0 0 0.3rem;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.form-section-title i { color: var(--coral); }
.form-section-hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: 0 0 0.4rem;
  line-height: 1.5;
}
.form-section-hint code {
  font-family: var(--font-mono);
  background: rgba(31, 58, 95, 0.1);
  padding: 0.1em 0.4em;
  border-radius: 4px;
}

.mcq-option-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.35rem;
}
.mcq-option-row input[type="radio"] { flex-shrink: 0; width: 18px; height: 18px; accent-color: var(--teal); }
.mcq-option-row input[type="text"] {
  flex: 1;
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.5em 0.75em;
  border-radius: var(--radius-s);
  border: 2px solid var(--line);
}

.dynamic-rows { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 0.6rem; }
.dynamic-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  background: #fff;
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-s);
  padding: 0.5rem 0.6rem;
}
.dynamic-row input[type="text"], .dynamic-row input[type="number"] {
  font-family: var(--font-body);
  font-size: 0.88rem;
  padding: 0.45em 0.65em;
  border-radius: 6px;
  border: 2px solid var(--line);
  flex: 1;
  min-width: 120px;
}
.dynamic-row .row-shape-select {
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.45em 0.5em;
  border-radius: 6px;
  border: 2px solid var(--line);
  background: #fff;
}
.row-remove-btn {
  flex-shrink: 0;
  width: 30px; height: 30px;
  border-radius: 8px;
  border: none;
  background: rgba(194, 59, 34, 0.1);
  color: var(--danger);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.row-remove-btn:hover { background: rgba(194, 59, 34, 0.2); }
.add-row-btn { align-self: flex-start; }

.pseudo-row input.pseudo-line-template { min-width: 180px; flex: 2; font-family: var(--font-mono); }
.pseudo-row input.pseudo-line-answer { min-width: 100px; font-family: var(--font-mono); }
.pseudo-row input.pseudo-line-alt { min-width: 140px; font-family: var(--font-mono); }
.pseudo-indent-label {
  display: flex;
  align-items: center;
  gap: 0.3em;
  font-size: 0.78rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.block-correct-row .block-type-select {
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.45em 0.5em;
  border-radius: 6px;
  border: 2px solid var(--line);
  background: #fff;
  flex-shrink: 0;
}
.block-field-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1;
  min-width: 140px;
}
.block-field-wrap span {
  font-size: 0.72rem;
  color: var(--ink-soft);
  font-weight: 700;
}