:root {
  --bg: #f4f8fb;
  --surface: #ffffff;
  --surface-2: #eef5f9;
  --border: #d6e2ea;
  --text: #13293d;
  --muted: #557086;
  --primary: #0f6fae;
  --primary-ink: #ffffff;
  --primary-soft: #e3f1fa;
  --teal: #0f8a8a;
  --teal-soft: #e0f4f2;
  --warn: #8a5a00;
  --warn-soft: #fff4dc;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --ok: #16794c;
  --ok-soft: #e3f5ec;
  --shadow: 0 1px 2px rgba(16, 42, 67, .06), 0 2px 8px rgba(16, 42, 67, .05);
  --radius: 10px;
  --topbar-h: 64px;
  font-size: 16px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--text);
  font-family: "Sarabun", "Noto Sans Thai", "Leelawadee UI", "Segoe UI", Tahoma, system-ui, sans-serif;
  line-height: 1.55;
}
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.3; margin: 0 0 .5rem; }
h1 { font-size: 1.35rem; } h2 { font-size: 1.15rem; } h3 { font-size: 1.02rem; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.nowrap { white-space: nowrap; }
.pre { white-space: pre-wrap; word-break: break-word; }
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .35rem;
  min-height: 40px; padding: .4rem .9rem; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer; text-decoration: none; font-weight: 500;
}
.btn:hover { border-color: var(--primary); }
.btn:focus-visible, .score-btn:focus-visible, .tab:focus-visible { outline: 3px solid #7cc0ec; outline-offset: 1px; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn.primary:hover { background: #0b5c92; }
.btn.teal { background: var(--teal); border-color: var(--teal); color: #fff; }
.btn.danger { color: var(--danger); border-color: #f0b7b1; }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.small { min-height: 32px; padding: .2rem .6rem; font-size: .875rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }

/* layout */
.app-header {
  position: sticky; top: 0; z-index: 30; background: var(--surface); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: .75rem; padding: .5rem 1rem; min-height: var(--topbar-h); flex-wrap: wrap;
}
.brand { font-weight: 700; color: var(--primary); display: flex; align-items: center; gap: .5rem; }
.brand .dot { width: 12px; height: 12px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--teal)); }
.header-spacer { flex: 1; }
.user-chip { font-size: .875rem; color: var(--muted); }
.page { max-width: 1280px; margin: 0 auto; padding: 1rem; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1rem; }
.card + .card { margin-top: 1rem; }
.grid-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .75rem; }
.tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: .75rem 1rem; }
.tile .num { font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.tile .lbl { font-size: .875rem; color: var(--muted); }

.badge { display: inline-flex; align-items: center; gap: .25rem; padding: .1rem .55rem; border-radius: 999px; font-size: .8rem; font-weight: 600; border: 1px solid transparent; white-space: nowrap; }
.b-none { background: #eef1f4; color: #4b5d6d; }
.b-draft { background: var(--warn-soft); color: var(--warn); }
.b-resubmit { background: var(--danger-soft); color: var(--danger); }
.b-submitted { background: var(--ok-soft); color: var(--ok); }
.b-ready { background: var(--teal-soft); color: var(--teal); }
.b-pending { background: #eef1f4; color: #4b5d6d; }
.b-mock { background: #f3ecff; color: #5b3a9b; }
.b-real { background: var(--primary-soft); color: var(--primary); }

.notice { border-radius: 8px; padding: .6rem .8rem; border: 1px solid; margin: .5rem 0; }
.notice.info { background: var(--primary-soft); border-color: #b9daf0; }
.notice.warn { background: var(--warn-soft); border-color: #f1d18f; color: #5c3d00; }
.notice.danger { background: var(--danger-soft); border-color: #f0b7b1; color: #7a1a12; }
.notice.mock { background: #f3ecff; border-color: #d6c4f5; color: #43287a; font-weight: 600; }
.notice.ok { background: var(--ok-soft); border-color: #a9dcc2; color: #0f5536; }

table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: .85rem; color: var(--muted); font-weight: 600; background: var(--surface-2); }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

label.field { display: block; margin: .6rem 0; }
label.field > span { display: block; font-weight: 600; font-size: .9rem; margin-bottom: .2rem; }
input[type=text], input[type=password], input[type=date], textarea, select {
  width: 100%; padding: .5rem .6rem; border: 1px solid var(--border); border-radius: 8px; background: #fff;
}
textarea { min-height: 90px; resize: vertical; }
input:focus, textarea:focus, select:focus { outline: 2px solid #7cc0ec; border-color: var(--primary); }
.radio-row { display: flex; flex-wrap: wrap; gap: .4rem 1rem; }
.radio-row label { display: inline-flex; align-items: center; gap: .3rem; min-height: 36px; }
fieldset { border: 1px solid var(--border); border-radius: 8px; padding: .5rem .8rem; margin: .6rem 0; }
legend { font-weight: 600; font-size: .9rem; padding: 0 .3rem; }

/* auth */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 1rem; }
.auth-card { width: 100%; max-width: 420px; }

/* ===== evaluation workspace ===== */
.ev-top {
  position: sticky; top: 0; z-index: 25; background: var(--surface); border-bottom: 1px solid var(--border);
  padding: .5rem 1rem; display: flex; flex-wrap: wrap; gap: .5rem 1rem; align-items: center;
}
.ev-top .case-id { font-size: 1.25rem; font-weight: 700; color: var(--primary); }
.ev-top .meta { display: flex; flex-wrap: wrap; gap: .4rem 1rem; font-size: .9rem; color: var(--muted); align-items: center; }
.ev-top .meta b { color: var(--text); }
.ev-body { display: grid; grid-template-columns: minmax(340px, 42%) 1fr; gap: 1rem; padding: 1rem; max-width: 1600px; margin: 0 auto; }
.ev-left { position: sticky; top: calc(var(--ev-top-h, 64px) + 1rem); align-self: start; max-height: calc(100vh - var(--ev-top-h, 64px) - 2rem); overflow-y: auto; }
.ev-left .card { padding: .75rem; }
.case-img-wrap { position: relative; background: #0d1b26; border-radius: 8px; overflow: hidden; display: flex; justify-content: center; align-items: center; min-height: 220px; }
.case-img-wrap img { display: block; width: 100%; max-height: 52vh; object-fit: contain; cursor: zoom-in; }
.case-img-wrap .img-actions { position: absolute; right: .5rem; bottom: .5rem; display: flex; gap: .35rem; }
.img-note { font-size: .8rem; color: var(--muted); margin-top: .35rem; }
.history-box, .prompt-box { background: var(--surface-2); border-radius: 8px; padding: .6rem .75rem; white-space: pre-wrap; word-break: break-word; }
.prompt-box { font-size: .92rem; }
.prompt-details > summary { cursor: pointer; }
.section-title { font-size: .85rem; font-weight: 700; color: var(--teal); text-transform: none; letter-spacing: .02em; margin: .85rem 0 .3rem; }

.tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: .75rem; }
.tab {
  flex: 1 1 0; min-width: 120px; border: 2px solid var(--border); background: var(--surface); border-radius: 10px;
  padding: .45rem .6rem; cursor: pointer; text-align: left; display: flex; flex-direction: column; gap: .15rem;
}
.tab .t-name { font-weight: 700; font-size: 1.05rem; }
.tab.active { border-color: var(--primary); background: var(--primary-soft); }

.answer-section { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); margin-bottom: 1rem; overflow: hidden; }
.answer-section > header { background: var(--surface-2); padding: .5rem .8rem; font-weight: 700; display: flex; justify-content: space-between; gap: .5rem; flex-wrap: wrap; }
.answer-text { padding: .75rem .9rem; white-space: pre-wrap; word-break: break-word; border-bottom: 1px dashed var(--border); }
.answer-text.missing { color: var(--danger); font-style: italic; }
.score-block { padding: .6rem .9rem .8rem; }
.score-row { display: grid; grid-template-columns: 210px 1fr; gap: .5rem; align-items: center; padding: .35rem 0; border-bottom: 1px solid #edf2f6; }
.score-row:last-child { border-bottom: 0; }
.score-row .lbl b { display: block; }
.score-row .lbl .hint { font-size: .78rem; color: var(--muted); }
.reason-box { grid-column: 1 / -1; padding: .2rem 0 .3rem; }
.reason-box label > span { display: block; font-size: .85rem; color: var(--danger); margin-bottom: .2rem; }
.reason-box textarea { min-height: 56px; }
.reason-box.missing-field textarea { border-color: var(--danger); background: var(--danger-soft); }
.score-row.missing-field { background: var(--danger-soft); border-radius: 6px; padding-left: .4rem; }
.score-btns { display: grid; grid-template-columns: repeat(5, minmax(44px, 1fr)); gap: .35rem; max-width: 380px; }
.score-btns.yn { grid-template-columns: repeat(2, minmax(64px, 1fr)); max-width: 220px; }
.score-btn {
  min-height: 44px; border-radius: 8px; border: 1.5px solid #b8cad8; background: #fff; font-weight: 700; font-size: 1.05rem; cursor: pointer;
}
.score-btn:hover { border-color: var(--primary); }
.score-btn[aria-pressed="true"] { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: inset 0 0 0 2px #0a4f7d; }
.score-btn.yes[aria-pressed="true"] { background: var(--danger); border-color: var(--danger); box-shadow: none; }
.score-btn.no[aria-pressed="true"] { background: var(--ok); border-color: var(--ok); box-shadow: none; }

.save-state { font-size: .875rem; font-weight: 600; display: inline-flex; align-items: center; gap: .3rem; }
.save-state.saving { color: var(--primary); }
.save-state.saved { color: var(--ok); }
.save-state.error { color: var(--danger); }
.save-state.dirty { color: var(--warn); }
.action-bar { position: sticky; bottom: 0; background: rgba(255,255,255,.97); border-top: 1px solid var(--border); padding: .6rem .5rem; display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; z-index: 5; margin: 0 -.25rem; }
.nav-bar { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: space-between; margin: .75rem 0; }

/* modal & lightbox */
.modal-back { position: fixed; inset: 0; background: rgba(10, 25, 40, .55); z-index: 100; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.modal { background: var(--surface); border-radius: 12px; max-width: 760px; width: 100%; max-height: 90vh; overflow: auto; padding: 1.1rem 1.2rem; }
.modal header { display: flex; justify-content: space-between; align-items: center; gap: .5rem; margin-bottom: .5rem; }
.lightbox { position: fixed; inset: 0; background: #071119; z-index: 120; display: flex; flex-direction: column; }
.lightbox .lb-bar { display: flex; gap: .4rem; padding: .5rem; flex-wrap: wrap; align-items: center; color: #fff; background: rgba(0,0,0,.4); }
.lightbox .lb-bar .btn { background: #1d2f3d; color: #fff; border-color: #35506a; }
.lightbox .lb-stage { flex: 1; overflow: hidden; position: relative; touch-action: none; cursor: grab; }
.lightbox .lb-stage img { position: absolute; left: 0; top: 0; transform-origin: 0 0; user-select: none; -webkit-user-drag: none; max-width: none; }

/* admin */
.case-list td .chips { display: flex; flex-wrap: wrap; gap: .25rem; }
.resp-card { border: 1px solid var(--border); border-radius: var(--radius); padding: .8rem; margin: .75rem 0; background: #fff; }
.resp-card h3 { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem 1rem; }
.feature { display: grid; grid-template-columns: minmax(260px, 420px) 1fr; gap: 1rem; align-items: start; }
.feature img { width: 100%; border-radius: 8px; background: #0d1b26; max-height: 320px; object-fit: contain; cursor: zoom-in; }
details summary { cursor: pointer; font-weight: 600; }
.score-mini td, .score-mini th { font-size: .82rem; padding: .25rem .35rem; text-align: center; }
.toast { position: fixed; bottom: 1rem; left: 50%; transform: translateX(-50%); background: #13293d; color: #fff; padding: .6rem 1rem; border-radius: 8px; z-index: 200; max-width: calc(100vw - 2rem); }

@media (max-width: 1100px) {
  .ev-body { grid-template-columns: 1fr; padding: .75rem; }
  .ev-left { position: static; max-height: none; overflow: visible; }
  .case-img-wrap img { max-height: 60vh; }
  .feature { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .ev-top { position: static; }
  .page { padding: .6rem; }
  .ev-body { padding: .5rem; gap: .6rem; }
  .ev-top { padding: .4rem .6rem; }
  .score-row { grid-template-columns: 1fr; gap: .25rem; }
  .score-btns { max-width: none; }
  .score-btns.yn { max-width: none; }
  .two-col { grid-template-columns: 1fr; }
  .tab { min-width: 0; }
  .app-header { padding: .4rem .6rem; }
  .card { padding: .75rem; }
}