/* pmh-auth — สไตล์ร่วมของหน้า login / register / landing / admin */
:root {
  --bg: #f3f6f6; --surface: #fff; --surface-2: #e9efef;
  --ink: #17232a; --ink-2: #4e5f66; --ink-3: #7c8b90; --line: #d2dcde;
  --accent: #0b6c72; --accent-ink: #085257; --accent-soft: #d8eced;
  --warn: #a64e17; --warn-soft: #f8e6d9;
  --good: #2a7a4c; --good-soft: #dcefe3;
  --bad: #b0323a; --bad-soft: #f6dddf;
  --radius: 12px;
  --font: "IBM Plex Sans Thai", "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1719; --surface: #162124; --surface-2: #1c2a2e;
    --ink: #e4ebeb; --ink-2: #a3b3b7; --ink-3: #7d8f94; --line: #2a3b3f;
    --accent: #5bc3c6; --accent-ink: #93dcde; --accent-soft: #153638;
    --warn: #eba06c; --warn-soft: #3a2415;
    --good: #74cc9a; --good-soft: #13301f;
    --bad: #f08a90; --bad-soft: #3b1a1d;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }
.hidden { display: none !important; }

/* การ์ดกลางจอ (login / register) */
.center { min-height: 100%; display: flex; align-items: center; justify-content: center; padding: 24px 16px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 32px 28px; width: 100%; max-width: 420px; box-shadow: 0 1px 2px rgba(23,35,42,.06), 0 12px 32px -16px rgba(23,35,42,.25); }
.brand { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.brand .mark { width: 36px; height: 36px; border-radius: 10px; background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 15px; letter-spacing: .02em; }
.brand .name { font-weight: 600; font-size: 15px; }
.brand .sub { font-size: 12px; color: var(--ink-3); display: block; }
h1 { font-size: 22px; line-height: 1.3; margin: 0 0 6px; }
.lead { color: var(--ink-2); font-size: 14.5px; margin: 0 0 20px; }
.lead b { color: var(--ink); }
label { display: block; font-size: 13px; font-weight: 500; color: var(--ink-2); margin: 0 0 6px; }
input[type=email], input[type=text], select, textarea {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.field { margin-bottom: 14px; }
.otp { text-align: center; font-size: 30px; letter-spacing: .4em; font-variant-numeric: tabular-nums; padding: 12px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; width: 100%; padding: 12px 16px; border-radius: 10px; border: 1px solid transparent; cursor: pointer; font-weight: 600; transition: filter .15s; }
.btn:disabled { opacity: .6; cursor: default; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--accent); border-color: var(--line); }
.btn-text { background: none; color: var(--ink-2); width: auto; padding: 6px 8px; font-weight: 500; font-size: 14px; }
.btn-sm { width: auto; padding: 7px 12px; font-size: 13.5px; }
.check { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink-2); margin: 4px 0 16px; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }
.alert { border-radius: 10px; padding: 10px 12px; font-size: 14px; margin-bottom: 14px; }
.alert.error { background: var(--bad-soft); color: var(--bad); }
.alert.success { background: var(--good-soft); color: var(--good); }
.alert.info { background: var(--accent-soft); color: var(--accent-ink); }
.foot { margin-top: 18px; font-size: 13px; color: var(--ink-3); text-align: center; }
.foot a { color: var(--ink-2); }
.session-box { background: var(--surface-2); border-radius: 10px; padding: 12px 14px; font-size: 14px; margin-bottom: 14px; display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.spinner { width: 18px; height: 18px; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }