/* Estilo ANDRITZ (basado en SAC_TPH: andritzTheme.ts + sagVisualTokens.ts) */
:root {
  --primary: #0075BE;
  --primary-dark: #003A70;
  --title: #005C99;
  --bg: linear-gradient(180deg, #F3F7FB 0%, #E6EDF5 100%);
  --bg-solid: #EEF3F8;
  --bar: linear-gradient(180deg, #003A70 0%, #00315F 100%);
  --card: linear-gradient(180deg, #FFFFFF 0%, #FAFCFE 100%);
  --card-solid: #FFFFFF;
  --card-border: rgba(0, 117, 190, 0.2);
  --card-shadow: 0 4px 20px rgba(0, 117, 190, 0.08);
  --text: #0F172A;
  --muted: #64748B;
  --input-bg: #FFFFFF;
  --input-border: #CBD5E1;
  --soft: rgba(0, 117, 190, 0.06);
  --success: #16A34A;
  --warning: #D97706;
  --danger: #DC2626;
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --primary: #2B9BE0;
    --title: #5CC8F5;
    --bg: radial-gradient(1200px 600px at 10% -10%, rgba(0,117,190,.18), transparent 60%), linear-gradient(180deg, #06101F 0%, #0A1628 100%);
    --bg-solid: #06101F;
    --bar: linear-gradient(180deg, #081A33 0%, #06142A 100%);
    --card: linear-gradient(180deg, rgba(20,38,64,.92) 0%, rgba(14,28,50,.92) 100%);
    --card-solid: #12233D;
    --card-border: rgba(56, 152, 214, 0.28);
    --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
    --text: #F1F7FF;
    --muted: #94A3B8;
    --input-bg: #0B1A2F;
    --input-border: #2A3F5F;
    --soft: rgba(56, 152, 214, 0.1);
    --success: #2BD67B;
    --warning: #F5A524;
    --danger: #F43F5E;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --primary: #2B9BE0;
  --title: #5CC8F5;
  --bg: radial-gradient(1200px 600px at 10% -10%, rgba(0,117,190,.18), transparent 60%), linear-gradient(180deg, #06101F 0%, #0A1628 100%);
  --bg-solid: #06101F;
  --bar: linear-gradient(180deg, #081A33 0%, #06142A 100%);
  --card: linear-gradient(180deg, rgba(20,38,64,.92) 0%, rgba(14,28,50,.92) 100%);
  --card-solid: #12233D;
  --card-border: rgba(56, 152, 214, 0.28);
  --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --text: #F1F7FF;
  --muted: #94A3B8;
  --input-bg: #0B1A2F;
  --input-border: #2A3F5F;
  --soft: rgba(56, 152, 214, 0.1);
  --success: #2BD67B;
  --warning: #F5A524;
  --danger: #F43F5E;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Inter", "Roboto", "Segoe UI", "Helvetica", "Arial", sans-serif;
  color: var(--text);
  background: var(--bg-solid);
  background-image: var(--bg);
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  line-height: 1.55;
}
[hidden] { display: none !important; }

/* Barra superior / inferior */
.topbar, .footer {
  background: var(--bar);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.topbar { height: 56px; position: sticky; top: 0; z-index: 10; }
.topbar .logo { height: 22px; filter: brightness(0) invert(1); }
.topbar .app-title {
  font-size: .8rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
  opacity: .85; border-left: 1px solid rgba(255,255,255,.25); padding-left: 16px;
}
.topbar .spacer { flex: 1; }
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.08);
  color: #fff; cursor: pointer; display: grid; place-items: center; font-size: 1rem;
}
.icon-btn:hover { background: rgba(255,255,255,.16); }
.footer { height: 48px; font-size: .75rem; justify-content: space-between; border-top: 1px solid rgba(255,255,255,.08); }
.footer .logo { height: 14px; filter: brightness(0) invert(1); opacity: .9; }
.footer span { opacity: .75; }

main { flex: 1; width: 100%; max-width: 860px; margin: 0 auto; padding: 32px 16px 48px; }
main.wide { max-width: 1200px; }

/* Tarjetas */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 28px;
  position: relative;
  overflow: hidden;
}
.card::before { /* línea de acento superior, como SagCard */
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), transparent 80%);
}
.card + .card { margin-top: 20px; }
.panel-title {
  font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--title); margin: 0 0 10px;
}
h1 { font-size: 1.6rem; margin: 0 0 6px; line-height: 1.25; }
h2 { font-size: 1.25rem; margin: 0 0 12px; line-height: 1.3; }
.subtitle { color: var(--muted); margin: 0 0 24px; }

/* Formularios */
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid .full { grid-column: 1 / -1; }
label { display: block; font-size: .8rem; font-weight: 600; color: var(--muted); margin-bottom: 6px; }
input, textarea {
  width: 100%; font: inherit; color: var(--text);
  background: var(--input-bg); border: 1px solid var(--input-border);
  border-radius: 10px; padding: 11px 14px; outline: none;
  transition: border-color .2s, box-shadow .2s;
}
input:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,117,190,.18); }
textarea { min-height: 280px; resize: vertical; line-height: 1.5; }
textarea.short { min-height: 180px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 600; font-size: .95rem;
  border-radius: var(--radius); border: 1px solid transparent;
  padding: 11px 22px; cursor: pointer; text-decoration: none;
  transition: transform .15s, box-shadow .2s, background .2s;
}
.btn-primary {
  background: linear-gradient(135deg, #0075BE, #003A70); color: #fff;
  box-shadow: 0 4px 14px rgba(0,117,190,.3);
}
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,117,190,.4); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--card-border); }
.btn-outline:hover:not(:disabled) { background: var(--soft); }
.btn-danger { background: transparent; color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); }
.btn-danger:hover:not(:disabled) { background: color-mix(in srgb, var(--danger) 10%, transparent); }
.btn-sm { padding: 6px 12px; font-size: .8rem; border-radius: 8px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-block { width: 100%; }
.actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 20px; flex-wrap: wrap; }

/* Instrucciones */
.rules { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.rules li {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--soft); border: 1px solid var(--card-border);
  border-radius: 10px; padding: 12px 14px;
}
.rules .n {
  flex: none; width: 26px; height: 26px; border-radius: 50%;
  background: var(--primary); color: #fff; font-size: .8rem; font-weight: 700;
  display: grid; place-items: center;
}
.rules li.warn { border-color: color-mix(in srgb, var(--warning) 45%, transparent); background: color-mix(in srgb, var(--warning) 9%, transparent); }
.rules li.warn .n { background: var(--warning); }

.alert { border-radius: 10px; padding: 12px 14px; margin-top: 16px; font-size: .92rem; }
.alert-error { color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent); }
.alert-info { color: var(--title); background: var(--soft); border: 1px solid var(--card-border); }

/* Pregunta */
.exam-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  margin-bottom: 16px; flex-wrap: wrap;
}
.progress { display: flex; gap: 6px; }
.progress span { width: 34px; height: 6px; border-radius: 3px; background: var(--card-border); }
.progress span.done { background: var(--success); }
.progress span.current { background: var(--primary); }
.timer {
  font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.35rem;
  padding: 6px 16px; border-radius: 10px; border: 1px solid var(--card-border);
  background: var(--card-solid); color: var(--title); min-width: 110px; text-align: center;
}
.timer.low { color: var(--warning); border-color: var(--warning); }
.timer.critical { color: var(--danger); border-color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .55; } }
.question-body { user-select: none; -webkit-user-select: none; }
.question-body p { margin: 0 0 12px; }
.question-body ul { margin: 0 0 12px; padding-left: 22px; }
.formula {
  font-family: "Cambria Math", "Times New Roman", serif; font-size: 1.2rem;
  text-align: center; padding: 12px; border-radius: 10px; background: var(--soft);
}
.answer-meta { display: flex; justify-content: space-between; font-size: .78rem; color: var(--muted); margin-top: 6px; }
.notice { font-size: .8rem; color: var(--muted); margin-top: 10px; }

.center { text-align: center; }
.big-icon {
  width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 16px;
  display: grid; place-items: center; font-size: 1.8rem; color: #fff;
}
.big-icon.ok { background: var(--success); }
.big-icon.warn { background: var(--warning); }

/* Login */
.login-wrap { max-width: 420px; margin: 40px auto 0; }
.login-logo { display: block; width: 180px; margin: 0 auto 24px; }

/* Admin */
.toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar .spacer { flex: 1; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 20px; }
.stat { background: var(--card); border: 1px solid var(--card-border); border-radius: 12px; padding: 14px 16px; }
.stat .v { font-size: 1.6rem; font-weight: 700; color: var(--title); }
.stat .l { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--card-border); vertical-align: top; }
th { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 700; white-space: nowrap; }
tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--soft); }
.badge { display: inline-block; font-size: .72rem; font-weight: 600; padding: 2px 10px; border-radius: 999px; white-space: nowrap; }
.badge.completed { color: var(--success); background: color-mix(in srgb, var(--success) 14%, transparent); }
.badge.expired { color: var(--warning); background: color-mix(in srgb, var(--warning) 14%, transparent); }
.badge.in_progress { color: var(--primary); background: var(--soft); }
.answer-block { border: 1px solid var(--card-border); border-radius: 10px; padding: 14px 16px; margin-top: 12px; }
.answer-block h3 { font-size: .95rem; margin: 0 0 8px; color: var(--title); }
.answer-block pre { white-space: pre-wrap; word-wrap: break-word; font: inherit; margin: 0; }
.answer-block .empty { color: var(--muted); font-style: italic; }
.answer-block .tag { font-size: .72rem; color: var(--warning); font-weight: 600; margin-left: 6px; }
.meta { color: var(--muted); font-size: .85rem; }

dialog {
  border: 1px solid var(--card-border); border-radius: 16px; padding: 24px;
  background: var(--card-solid); color: var(--text); width: min(560px, calc(100vw - 32px));
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}
dialog.wide { width: min(900px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(6, 16, 31, .55); }
dialog .close { float: right; }

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .card { padding: 20px; }
  .topbar .app-title { display: none; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  h1 { font-size: 1.35rem; }
  .progress span { width: 20px; }
  .footer { padding: 0 16px; }
}
.mt { margin-top: 18px; }
.mt-lg { margin-top: 28px; }

/* Interruptores de habilitación (admin) */
.switch-row {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 0; border-top: 1px solid var(--card-border);
}
.switch-row:first-of-type { border-top: 0; }
.switch-row > div { flex: 1; min-width: 0; }
.switch-row p { margin: 2px 0 0; }
.mono { font-family: Consolas, "Courier New", monospace; font-size: .82rem; word-break: break-all; }
.switch { position: relative; display: inline-block; width: 52px; height: 28px; margin: 0; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span {
  position: absolute; inset: 0; cursor: pointer; border-radius: 999px;
  background: var(--input-border); transition: background .2s;
}
.switch span::before {
  content: ""; position: absolute; width: 22px; height: 22px; left: 3px; top: 3px;
  border-radius: 50%; background: #fff; transition: transform .2s; box-shadow: 0 1px 3px rgba(0,0,0,.3);
}
.switch input:checked + span { background: var(--success); }
.switch input:checked + span::before { transform: translateX(24px); }
.switch input:focus-visible + span { box-shadow: 0 0 0 3px rgba(0,117,190,.3); }
.switch-state { width: 100px; font-size: .8rem; font-weight: 600; flex: none; }
.switch-state.on { color: var(--success); }
.switch-state.off { color: var(--muted); }

/* Pestañas (admin) */
.tabs { display: flex; gap: 4px; margin: 24px 0 16px; border-bottom: 1px solid var(--card-border); }
.tab {
  font: inherit; font-weight: 600; font-size: .9rem; color: var(--muted);
  background: none; border: 0; border-bottom: 3px solid transparent;
  padding: 10px 16px; cursor: pointer; margin-bottom: -1px;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab .count {
  display: inline-block; min-width: 22px; padding: 0 6px; margin-left: 6px; border-radius: 999px;
  background: var(--soft); color: var(--title); font-size: .75rem; text-align: center;
}
.card .toolbar { margin-bottom: 8px; }
.card .toolbar .panel-title { margin: 0; }

@media (max-width: 640px) {
  .switch-row { flex-wrap: wrap; }
  .switch-row > div { flex-basis: 100%; }
  .switch-state { width: auto; }
}