/* Hallmark · genre: playful (calm) · macrostructure: Split Studio · theme: shared brand system (tokens.css): light blue student panel, navy teacher panel
 * pages: login.html (students, NISN) · teacher.html (teachers/admins, NIP or email) — mirrored halves
 * enrichment: none (typography only; the 3D owl lives on the landing page)
 * nav: N9 edge-aligned minimal · footer: Ft2 inline single line
 * tone: calm/soft · audience: MTsN 32 Cambridge students 12–15 (mostly school/home computers), teachers
 * pre-emit critique: P5 H5 E4 S5 R4 V5 · contrast: pass (40–41) · inputs: pass (39) · mobile: pass (34, 49–57)
 */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { overflow-x: clip; }
body {
  font-family: var(--font-body); color: var(--color-ink); background: var(--color-paper);
  line-height: 1.55; overflow-x: clip; min-height: 100dvh; display: flex; flex-direction: column;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.icon { width: 18px; height: 18px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ============ NAV · N9 edge-aligned ============ */
.topbar { height: var(--nav-h); border-bottom: 1px solid var(--color-rule); background: var(--color-paper); }
.topbar .in { height: 100%; max-width: var(--shell); margin-inline: auto; padding-inline: var(--gutter); display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); }
.brand { display: flex; align-items: center; gap: var(--space-xs); border-radius: var(--radius-input); }
.brand img { width: 40px; height: 40px; object-fit: contain; }
.brand strong { display: block; font-size: 15px; font-weight: 800; line-height: 1.15; }
.brand small { display: block; font-size: var(--text-xs); color: var(--color-muted); font-weight: 500; }
.back {
  display: inline-flex; align-items: center; gap: var(--space-2xs); font-size: var(--text-sm); font-weight: 700;
  color: var(--color-ink-2); white-space: nowrap; padding: var(--space-2xs) var(--space-xs); border-radius: var(--radius-pill);
  transition: background-color var(--dur-fast) var(--ease-out);
}
.back:hover { background: var(--color-paper-2); }
.back:active { background: var(--color-paper-3); }
.back .icon { width: 16px; height: 16px; transform: scaleX(-1); }

/* ============ SPLIT ============ */
.auth { flex: 1; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.auth--mirror .panel { order: 2; }
.panel {
  background: var(--color-sky); border-right: 1px solid var(--color-sky-rule);
  padding: var(--space-xl) var(--space-xl) var(--space-2xl); display: flex; flex-direction: column; justify-content: center; gap: var(--space-lg);
}
.auth--mirror .panel { border-right: 0; border-left: 1px solid var(--color-rule); }
.panel--night { background: var(--color-night); color: var(--color-on-dark); border-color: transparent !important; }
.panel--night :focus-visible { outline-color: var(--color-focus-dark); }
.panel-in { width: min(100%, 520px); margin-inline: auto; display: grid; gap: var(--space-lg); }
.panel h1 { font-size: clamp(2rem, 1.2rem + 2.6vw, 3.25rem); line-height: 1.06; font-weight: 800; letter-spacing: -.03em; overflow-wrap: anywhere; min-width: 0; text-wrap: balance; }
.hl { background-image: linear-gradient(var(--color-action) 0 0); background-repeat: no-repeat; background-size: 100% 0.28em; background-position: 0 88%; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.panel--night .hl { background: none; color: var(--color-action); }
.panel .lead { font-size: 1.0625rem; color: var(--color-ink-2); max-width: 46ch; margin-top: var(--space-xs); }
.panel--night .lead { color: var(--color-on-dark-2); }

.how { list-style: none; display: grid; gap: var(--space-sm); border-top: 1px solid var(--color-sky-rule); padding-top: var(--space-md); }
.panel--night .how { border-color: color-mix(in oklch, var(--color-on-dark) 16%, transparent); }
.how li { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: var(--space-xs); font-size: 15px; color: var(--color-ink-2); }
.panel--night .how li { color: var(--color-on-dark-2); }
.how li b { color: var(--color-ink); font-weight: 700; }
.panel--night .how li b { color: var(--color-on-dark); }
.how .n {
  width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center;
  background: var(--color-card); border: 1px solid var(--color-rule-2); font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--color-ink);
}
.panel--night .how .n { background: transparent; border-color: color-mix(in oklch, var(--color-on-dark) 30%, transparent); color: var(--color-on-dark); }

/* ============ FORM SIDE ============ */
.form-side { display: flex; align-items: center; justify-content: center; padding: var(--space-xl) var(--gutter) var(--space-2xl); }
.form-card { width: min(100%, 420px); }
.form-card .who { display: inline-flex; align-items: center; gap: var(--space-2xs); font-size: var(--text-sm); font-weight: 700; color: var(--color-accent-deep); }
.form-card h2 { font-size: var(--text-2xl); font-weight: 800; letter-spacing: -.02em; line-height: 1.15; margin-top: var(--space-2xs); }
.form-card .sub { color: var(--color-muted); font-size: 15px; margin-top: var(--space-3xs); }
form { margin-top: var(--space-lg); display: grid; gap: var(--space-2xs); }

.field { display: grid; gap: var(--space-3xs); }
.label-row { display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-xs); }
label, .label { font-size: var(--text-sm); font-weight: 700; }
.count { font-size: 12px; color: var(--color-muted); }
.count.done { color: var(--color-success); }
.control { position: relative; }
.input {
  width: 100%; height: 48px; padding: 0 44px 0 var(--space-sm); border-radius: var(--radius-input);
  border: 1px solid var(--color-rule-2); outline: 2px solid transparent; outline-offset: 1px;
  background: var(--color-card); font-size: var(--text-md); color: var(--color-ink);
  transition: background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.input::placeholder { color: var(--color-muted); }
.input:focus-visible, .input:focus { outline-color: var(--color-focus); border-color: var(--color-ink-2); transition: none; }
.input[aria-invalid="true"] { border-color: var(--color-error); background: var(--color-error-tint); }
.input:disabled { opacity: .55; cursor: not-allowed; }
.input.is-num { font-family: var(--font-mono); letter-spacing: .06em; }
@media (hover: hover) { .input:hover:not(:focus):not(:disabled) { background: var(--color-paper); } }
.slot { position: absolute; right: 4px; top: 4px; width: 40px; height: 40px; display: grid; place-items: center; }
.eye {
  width: 40px; height: 40px; border: 0; border-radius: 10px; background: transparent; color: var(--color-muted); cursor: pointer; display: grid; place-items: center;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.eye:hover { background: var(--color-paper-2); color: var(--color-ink); }
.eye:active { background: var(--color-paper-3); }
.eye .i-hide, .eye[aria-pressed="true"] .i-show { display: none; }
.eye[aria-pressed="true"] .i-hide { display: block; }
.slot .ok { color: var(--color-success); }
.slot .ok[hidden] { display: none; }
.helper { min-height: 1lh; font-size: 13px; color: var(--color-muted); line-height: 1.45; display: flex; gap: var(--space-2xs); align-items: flex-start; }
.helper.err { color: var(--color-error); font-weight: 600; }
.helper.err::before { content: "!"; flex-shrink: 0; width: 16px; height: 16px; margin-top: 1px; border-radius: 50%; background: var(--color-error); color: var(--color-card); font-size: 11px; font-weight: 800; display: grid; place-items: center; }

.check { display: flex; gap: var(--space-xs); align-items: flex-start; font-size: var(--text-sm); font-weight: 600; margin-top: var(--space-3xs); cursor: pointer; }
.check input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--color-accent-deep); flex-shrink: 0; }
.check span { display: grid; }
.check small { color: var(--color-muted); font-size: 13px; font-weight: 400; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2xs);
  min-height: 48px; padding: 0 var(--space-md); border-radius: var(--radius-pill); border: 1px solid transparent;
  font-weight: 700; font-size: var(--text-md); line-height: 1; white-space: nowrap; cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out);
}
.btn--push { width: 100%; margin-top: var(--space-md); background: var(--color-action); color: var(--color-ink); box-shadow: 0 4px 0 0 var(--color-action-deep), 0 6px 12px -3px var(--color-action-cast); }
.btn--push:hover { transform: translateY(-2px); box-shadow: 0 6px 0 0 var(--color-action-deep), 0 12px 22px -4px var(--color-action-cast); }
.btn--push:active { transform: translateY(3px); box-shadow: 0 1px 0 0 var(--color-action-deep), 0 2px 6px -2px var(--color-action-cast); transition-duration: 70ms; }
.btn--push[aria-disabled="true"] { opacity: .55; cursor: not-allowed; transform: none; box-shadow: 0 4px 0 0 var(--color-action-deep); }
.btn--push[data-state="loading"] { cursor: progress; }
.btn--push[data-state="success"] { background: var(--color-success); color: var(--color-on-dark); box-shadow: 0 4px 0 0 var(--color-ink); }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2px solid color-mix(in oklch, currentColor 30%, transparent); border-top-color: currentColor; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.form-alert { display: none; gap: var(--space-xs); align-items: flex-start; padding: var(--space-sm); border-radius: var(--radius-input); background: var(--color-error-tint); color: var(--color-error); font-size: var(--text-sm); font-weight: 600; margin-top: var(--space-sm); }
.form-alert.show { display: flex; }
.form-alert .icon { margin-top: 1px; }

/* Help disclosures: forgot password + no account */
.help { margin-top: var(--space-lg); border-top: 1px solid var(--color-rule); }
.help-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: var(--space-sm);
  padding: var(--space-sm) var(--space-3xs); background: none; border: 0; border-bottom: 1px solid var(--color-rule);
  font-size: 15px; font-weight: 700; cursor: pointer; text-align: left; border-radius: 4px;
  transition: color var(--dur-fast) var(--ease-out);
}
.help-q:hover { color: var(--color-accent-deep); }
.help-q .icon { transition: transform var(--dur-med) var(--ease-out); color: var(--color-muted); }
.help-q[aria-expanded="true"] .icon { transform: rotate(45deg); }
.help-a { padding: var(--space-xs) var(--space-3xs) var(--space-md); font-size: var(--text-sm); color: var(--color-ink-2); border-bottom: 1px solid var(--color-rule); }
.help-a[hidden] { display: none; }
.help-a p + p { margin-top: var(--space-2xs); }
.rooms { display: flex; flex-wrap: wrap; gap: var(--space-2xs); margin-top: var(--space-xs); list-style: none; }
.rooms li { display: inline-flex; align-items: center; gap: var(--space-2xs); padding: var(--space-2xs) var(--space-xs); border-radius: var(--radius-pill); background: var(--color-action-tint); color: var(--color-ink); font-weight: 700; font-size: 13px; }
.rooms .icon { width: 16px; height: 16px; }

.switch-role { margin-top: var(--space-lg); font-size: var(--text-sm); color: var(--color-muted); }
.switch-role a { color: var(--color-accent-deep); font-weight: 700; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; white-space: nowrap; }

.demo { margin-top: var(--space-md); padding: var(--space-xs) var(--space-sm); border: 1px dashed var(--color-rule-2); border-radius: var(--radius-input); font-size: 13px; color: var(--color-muted); }
.demo b { color: var(--color-ink-2); }
.demo code { font-family: var(--font-mono); font-size: 12px; color: var(--color-ink); }

/* ============ FOOTER · Ft2 ============ */
.foot { border-top: 1px solid var(--color-rule); font-size: 13px; color: var(--color-muted); }
.foot .in { max-width: var(--shell); margin-inline: auto; padding: var(--space-sm) var(--gutter); display: flex; flex-wrap: wrap; gap: var(--space-2xs) var(--space-sm); align-items: center; }
.foot .sep { color: var(--color-rule-2); }

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .auth { grid-template-columns: minmax(0, 1fr); }
  .panel, .auth--mirror .panel { order: 2; border: 0; border-top: 1px solid var(--color-rule); padding: var(--space-xl) var(--gutter); }
  .form-side { padding-block: var(--space-lg) var(--space-xl); }
}
@media (max-width: 560px) {
  :root { --nav-h: 60px; }
  .brand small { display: none; }
  .back span { display: none; }
  .back { width: 44px; height: 44px; justify-content: center; padding: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0s !important; }
  .btn--push:hover, .btn--push:active { transform: none; }
  .spinner { animation-duration: 2s; }
}