/* Ace NPPE - Step 1 quiz screen (PRD Screen 3). */

@font-face {
  font-family: "Noto Sans";
  src: url("/static/fonts/NotoSans-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Noto Sans";
  src: url("/static/fonts/NotoSans-Bold.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #eef2f7;
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
  --ok: #16a34a;
  --ok-tint: rgba(22, 163, 74, 0.18);
  --bad: #dc2626;
  --bad-tint: rgba(220, 38, 38, 0.14);
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.07);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

/* Author display rules (.hud etc.) would otherwise override the UA [hidden] style. */
[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---------- sticky header (PRD: timer / completed / incorrect) ---------- */

.hud {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 32px;
  padding: 13px 18px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.hud__item {
  font-size: 15px;
  color: var(--ink);
}

.hud__value {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.hud__error,
.hud__error .hud__value {
  color: var(--bad);
}

/* ---------- layout ---------- */

.shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 26px 16px 72px;
}

.shell--narrow {
  max-width: 640px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
}

.stack > * + * {
  margin-top: 14px;
}

.stack h1 {
  margin: 0;
  font-size: 26px;
  line-height: 1.25;
}

.muted {
  color: var(--muted);
  margin: 0;
}

.chip {
  display: inline-block;
  width: fit-content;
  margin: 0;
  padding: 3px 11px;
  border-radius: 999px;
  background: #eef2ff;
  border: 1px solid #dfe6ff;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ---------- buttons ---------- */

.btn {
  font: inherit;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  width: fit-content;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.btn--primary {
  background: var(--primary);
  color: #ffffff;
}

.btn--primary:hover {
  background: var(--primary-dark);
}

.btn--primary:active {
  transform: translateY(1px);
}

.btn:focus-visible,
.option:focus-visible,
.flag-btn:focus-visible {
  outline: 3px solid rgba(29, 78, 216, 0.4);
  outline-offset: 2px;
}

/* ---------- error banner ---------- */

.error-banner {
  margin-bottom: 16px;
  padding: 12px 16px;
  border-radius: 12px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  font-size: 15px;
}

/* ---------- quiz card ---------- */

/* Anti-copy is deterrence only: text selection, drag, and the context menu are
   suppressed client-side. Real protection is the Cloudflare/JIT layer (later step). */
.quiz-card {
  user-select: none;
  -webkit-user-select: none;
}

.quiz-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.quiz-card__counter {
  font-size: 14px;
}

.flag-btn {
  margin-left: auto;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #ffffff;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.flag-btn:hover {
  color: var(--bad);
  border-color: #fecaca;
}

.flag-btn.is-flagged {
  background: var(--bad);
  border-color: var(--bad);
  color: #ffffff;
  cursor: default;
}

.question-canvas {
  display: block;
  width: 100%;
  margin: 10px 0 2px;
}

/* ---------- options grid (WebP images; 2x2 desktop, 1x4 mobile) ---------- */

.options {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 18px;
}

@media (min-width: 760px) {
  .options {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}

.option {
  position: relative;
  padding: 0;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
  text-align: left;
}

/* Option text is a pre-rendered transparent WebP; the card background and the
   colour overlays sit behind it. */
.option img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none; /* clicks belong to the button */
  -webkit-user-drag: none;
}

.options:not(.is-locked) .option:hover {
  border-color: #b9c4fd;
  box-shadow: 0 4px 16px rgba(29, 78, 216, 0.12);
  transform: translateY(-1px);
}

.options.is-locked .option {
  cursor: default;
}

/* tint + badge overlays (the image itself stays untouched) */
.option::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: transparent;
  pointer-events: none;
  transition: background-color 0.18s ease;
}

.option::before {
  content: "";
  position: absolute;
  top: 10px;
  right: 14px;
  z-index: 2;
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.18s ease;
}

.option.is-correct {
  border-color: var(--ok);
}

.option.is-correct::after {
  background: var(--ok-tint);
}

.option.is-correct::before {
  content: "\2713";
  color: var(--ok);
  opacity: 1;
}

.option.is-incorrect {
  border-color: var(--bad);
}

.option.is-incorrect::after {
  background: var(--bad-tint);
}

.option.is-incorrect::before {
  content: "\2717";
  color: var(--bad);
  opacity: 1;
}

.option.is-missing img {
  display: none;
}

.option.is-missing::before {
  content: "Image unavailable";
  position: static;
  display: block;
  padding: 22px;
  opacity: 1;
  font-size: 15px;
  font-weight: 400;
  color: var(--muted);
}

/* ---------- explanation slide-down ---------- */

.explanation {
  display: grid;
  grid-template-rows: 0fr;
  margin-top: 0;
  transition: grid-template-rows 0.35s ease, margin-top 0.35s ease;
}

.explanation.is-open {
  grid-template-rows: 1fr;
  margin-top: 18px;
}

.explanation__clip {
  overflow: hidden;
  min-height: 0;
}

.explanation__panel {
  border-left: 4px solid var(--primary);
  background: #f8fafc;
  border-radius: 12px;
  padding: 14px 18px 16px;
}

.explanation__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.explanation-canvas {
  display: block;
  width: 100%;
}

/* ---------- actions / complete ---------- */

.quiz-card__actions {
  margin-top: 18px;
}

.quiz-card__actions .btn[hidden] {
  display: none;
}

.complete-card h1 {
  font-size: 24px;
}

@media (prefers-reduced-motion: reduce) {
  .explanation,
  .option,
  .btn {
    transition: none;
  }
}

/* ============================ Step 3: accounts, pricing, checkout ======================== */

/* ---------- header / account ---------- */

.site-header {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
}

.brand {
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.account {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.account__email {
  font-size: 14px;
  color: var(--muted);
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.account form {
  margin: 0;
}

.tier {
  display: inline-block;
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tier--free {
  background: #f1f5f9;
  border: 1px solid var(--line);
  color: var(--muted);
}

.tier--premium {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #047857;
}

/* ---------- buttons ---------- */

.btn--ghost {
  background: #ffffff;
  border-color: var(--line);
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: #c7d2fe;
  background: #f8fafc;
}

.btn--sm {
  padding: 8px 14px;
  font-size: 14px;
  border-radius: 10px;
}

.btn--google {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #ffffff;
  border: 1.5px solid var(--line);
  color: var(--ink);
}

.btn--google:hover {
  border-color: #c7d2fe;
  background: #f8fafc;
}

.btn:disabled {
  opacity: 0.55;
  cursor: default;
}

/* ---------- landing hero ---------- */

.hero {
  padding: 34px 0 8px;
  max-width: 780px;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: 38px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero__lede {
  margin: 0 0 18px;
  font-size: 18px;
  color: var(--muted);
}

.notice {
  margin: 18px 0 0;
  padding: 12px 16px;
  border-radius: 12px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #92400e;
  font-size: 15px;
}

/* ---------- sign-in / account cards ---------- */

.signin-card,
.account-card {
  margin-top: 26px;
}

.signin-card h2 {
  margin: 0 0 6px;
  font-size: 21px;
}

.signin-form {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.dev-login {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.account-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.account-card__status {
  flex: 1 1 380px;
}

.account-card__status .tier {
  margin-bottom: 8px;
}

/* ---------- pricing ---------- */

.pricing {
  margin-top: 34px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 800px) {
  .pricing {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }
}

.pricing__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

.pricing__card--featured {
  border-color: #bfdbfe;
  box-shadow: 0 14px 36px rgba(29, 78, 216, 0.12);
}

.pricing__ribbon {
  position: absolute;
  top: -13px;
  left: 24px;
  margin: 0;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--primary);
  color: #ffffff;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.pricing__title {
  margin: 6px 0 0;
  font-size: 20px;
}

.pricing__price {
  margin: 0;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.pricing__period {
  font-size: 16px;
  font-weight: 400;
  color: var(--muted);
}

.pricing__list {
  margin: 0;
  padding-left: 20px;
  color: var(--ink);
  display: grid;
  gap: 7px;
}

.pricing__list li::marker {
  color: var(--primary);
}

.pricing__fineprint {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  font-weight: 600;
}

.pricing__card form {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.pricing__card > .btn,
.pricing__card > .muted {
  margin-top: auto;
}

/* ---------- how it works / footer ---------- */

.how {
  margin-top: 40px;
}

.how h2 {
  font-size: 22px;
  margin: 0 0 12px;
}

.how__steps {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 10px;
  color: var(--ink);
}

.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.site-footer p {
  margin: 0;
  padding: 18px 0;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- checkout / verified ---------- */

.spinner {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 3px solid #dbeafe;
  border-top-color: var(--primary);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation-duration: 2.5s;
  }
}

/* ---------- quiz additions ---------- */

.complete-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.review-card {
  scroll-margin-top: 72px;
}

.review-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.review-nav__back {
  margin-left: auto;
}

.turnstile-slot {
  min-height: 0;
}

.option:disabled {
  opacity: 1;
  cursor: default;
}

/* ============================ Step 4: separate pages ==================================== */

.hero--compact {
  padding-bottom: 0;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.pricing--single {
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 900px) {
  .pricing--single {
    grid-template-columns: 1.4fr 1fr;
  }
}

.payment__aside h2 {
  margin-bottom: 12px;
}

.payment__aside .how__steps {
  margin-bottom: 14px;
}

.signin-card h1 {
  margin: 6px 0 8px;
  font-size: 26px;
  line-height: 1.2;
}

.signin-card__footnote {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
}

.how a {
  color: var(--primary-dark);
}

/* ---------- quiz page: static top bar, info strip ---------- */

.site-header--static {
  position: static;
}

.info-strip {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 0 0 18px;
  padding: 12px 16px;
  border-radius: 12px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e3a8a;
  font-size: 14.5px;
  line-height: 1.5;
}

.info-strip__icon {
  font-size: 16px;
  line-height: 1.4;
}

@media (max-width: 620px) {
  .info-strip {
    font-size: 14px;
  }
}

/* ---------- home: test sets overview ---------- */

.sets {
  margin-top: 40px;
}

.sets h2 {
  font-size: 22px;
  margin: 0 0 14px;
}

.sets__subhead {
  margin: 24px 0 6px;
  font-size: 17px;
}

.set-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.set-row > div {
  flex: 1 1 320px;
}

.set-row h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 6px;
  font-size: 18px;
}

.sets__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

@media (min-width: 700px) {
  .sets__list {
    grid-template-columns: 1fr 1fr;
  }
}

.set-chip {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
}

.set-chip__name {
  font-weight: 700;
}

.set-chip__meta {
  color: var(--muted);
  font-size: 14px;
}

.set-chip__state {
  margin-left: auto;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

.set-chip__state--owned {
  color: #047857;
}

/* ---------- exam summary and group breakdown ---------- */

.summary-heading {
  margin: 18px 0 4px;
  font-size: 17px;
}

.group-table,
.group-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.group-row {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.group-row:hover:not(:disabled) {
  border-color: #c7d2fe;
  background: #f8fafc;
}

.group-row:disabled {
  opacity: 0.65;
  cursor: default;
}

.group-row__name {
  font-weight: 700;
}

.group-row__score {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.group-row__state {
  min-width: 84px;
  text-align: right;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--bad);
}

.group-row:disabled .group-row__state {
  color: var(--ok);
}

.group-item {
  width: 100%;
  display: grid;
  gap: 4px;
  padding: 12px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.group-item:hover {
  border-color: #c7d2fe;
  background: #f8fafc;
}

.group-item__index {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-dark);
}

.group-item__text {
  color: var(--ink);
}

/* ---------- completed exams on the start card ---------- */

.exam-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.exam-list__item {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.exam-list__item:hover {
  border-color: #c7d2fe;
  background: #f8fafc;
}

.exam-list__name {
  font-weight: 700;
}

.exam-list__meta {
  color: var(--muted);
  font-size: 14px;
}

.exam-list__go {
  margin-left: auto;
  font-weight: 700;
  font-size: 14px;
  color: var(--primary-dark);
}

/* ---------- question report panel ---------- */

.report-panel {
  margin: 12px 0 4px;
  padding: 14px 16px;
  border: 1px solid #fecaca;
  background: #fef2f2;
  border-radius: 12px;
}

.report-panel__title {
  margin: 0 0 10px;
  font-weight: 700;
  color: #991b1b;
}

.report-panel__reasons {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr;
}

@media (min-width: 620px) {
  .report-panel__reasons {
    grid-template-columns: 1fr 1fr;
  }
}

.report-reason {
  padding: 11px 14px;
  border: 1px solid #fecaca;
  border-radius: 10px;
  background: #ffffff;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.report-reason:hover {
  border-color: var(--bad);
  color: var(--bad);
}

.report-panel__actions {
  margin-top: 10px;
}

/* ---------- share panel ---------- */

.share {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.share__title {
  margin: 0 0 6px;
  font-size: 19px;
}

.share__row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.share__link {
  flex: 1 1 260px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  background: #f8fafc;
  color: var(--ink);
}

/* ---------- survey ---------- */

.survey-form {
  display: grid;
  gap: 18px;
}

.survey-fieldset {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  display: grid;
  gap: 8px;
}

.survey-fieldset legend {
  padding: 0 6px;
  font-weight: 700;
}

.survey-fieldset label {
  display: flex;
  align-items: center;
  gap: 9px;
}

.survey-fieldset textarea {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  width: 100%;
}

.survey-result {
  display: grid;
  gap: 10px;
  justify-items: start;
}

/* ---------- admin review queue ---------- */

.admin-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.admin-filters .is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.admin-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.admin-entry__head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.admin-entry__id {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  color: var(--muted);
}

.admin-entry__count {
  margin-left: auto;
  font-weight: 700;
  color: var(--bad);
}

.admin-entry__body {
  margin: 12px 0;
}

.admin-entry__options {
  margin: 0 0 12px;
  padding-left: 18px;
  display: grid;
  gap: 5px;
  color: var(--muted);
}

.admin-entry__options .is-correct {
  color: var(--ok);
  font-weight: 700;
}

.admin-entry__reasons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.admin-reason {
  padding: 3px 10px;
  border-radius: 999px;
  background: #eef2ff;
  border: 1px solid #dfe6ff;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.admin-entry__reporters {
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--muted);
}

.terms__heading {
  margin: 18px 0 6px;
  font-size: 17px;
}