:root {
  --bg: #f3f0e8;
  --bg-deep: #e7e1d3;
  --ink: #1c2430;
  --muted: #5c6674;
  --card: #fffdf8;
  --line: #cfc6b4;
  --accent: #0f5c4c;
  --accent-hover: #0a463a;
  --accent-soft: #d7ebe5;
  --danger: #8b2e2e;
  --danger-soft: #f5e1e1;
  --ok: #1f6b3a;
  --ok-soft: #dff0e4;
  --shadow: 0 18px 40px rgba(28, 36, 48, 0.08);
  --radius: 18px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Source Sans 3", "Segoe UI", sans-serif;
  color-scheme: light;
  --input-bg: #ffffff;
  --chip-bg: #f0ebe1;
  --option-bg: #ffffff;
  --option-hover: #f8fffc;
  --code-bg: #f4f1ea;
  --filter-bg: #f3faf7;
  --filter-line: #dce8e4;
  --banner-bg: #fff6df;
  --banner-line: #e6d7a8;
  --glow: rgba(15, 92, 76, 0.12);
  --answer-correct-bg: #c8e6d0;
  --answer-correct-ink: #143522;
  --answer-missed-bg: #e8f6ec;
  --answer-missed-ink: #1a3d28;
  --answer-missed-border: #6fae84;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #141a22;
  --bg-deep: #0e1319;
  --ink: #e8eef4;
  --muted: #9aa8b5;
  --card: #1c2430;
  --line: #334155;
  --accent: #3d9b84;
  --accent-hover: #52b59c;
  --accent-soft: #1e3d36;
  --danger: #f07178;
  --danger-soft: #3a2226;
  --ok: #6bcf8e;
  --ok-soft: #1e3a2a;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  --input-bg: #121820;
  --chip-bg: #243041;
  --option-bg: #121820;
  --option-hover: #1a2836;
  --code-bg: #0f141b;
  --filter-bg: #17242a;
  --filter-line: #2a4540;
  --banner-bg: #2a2418;
  --banner-line: #5a4a28;
  --glow: rgba(61, 155, 132, 0.18);
  --answer-correct-bg: #1f4a33;
  --answer-correct-ink: #d8f5e4;
  --answer-missed-bg: #243d2e;
  --answer-missed-ink: #c8efd4;
  --answer-missed-border: #6bcf8e;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, var(--glow), transparent 35%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-deep) 100%);
  line-height: 1.5;
  transition: background 180ms ease, color 180ms ease;
}

a {
  color: inherit;
  text-decoration: none;
}

.shell {
  width: min(920px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.hero,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  padding: 3rem 2.5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: auto -10% -40% auto;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(15, 92, 76, 0.18), transparent 70%);
  pointer-events: none;
}

.brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
}

.lede {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 38rem;
  margin: 0 0 2rem;
}

.bank-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
  margin: 0 0 1.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--filter-line);
  border-radius: 14px;
  background: var(--filter-bg);
}

.bank-filter-label {
  font-weight: 700;
  color: var(--ink);
}

.bank-filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.bank-option {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--input-bg);
  color: var(--ink);
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.bank-option:hover {
  background: rgba(28, 36, 48, 0.04);
}

.bank-option.is-selected {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.site-auth {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

.theme-toggle {
  appearance: none;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  box-shadow: var(--shadow);
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  background: var(--accent-soft);
  border-color: var(--accent);
}

.theme-toggle:active {
  transform: translateY(0);
}

.theme-toggle svg {
  width: 1.15rem;
  height: 1.15rem;
  display: block;
}

.auth-username {
  font-weight: 700;
  color: var(--ink);
}

.profile-form {
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
}

.profile-form.modal-form {
  padding: 0;
}

.profile-label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.45rem;
}

.profile-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.profile-input {
  flex: 1 1 12rem;
  min-width: 10rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.8rem 1rem;
  font: inherit;
  background: var(--input-bg);
  color: var(--ink);
}

.profile-input:focus {
  outline: 2px solid rgba(15, 92, 76, 0.35);
  outline-offset: 1px;
  border-color: var(--accent);
}

.profile-hint {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(28, 36, 48, 0.45);
  backdrop-filter: blur(2px);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-card {
  position: relative;
  width: min(100%, 34rem);
  padding: 1.35rem 1.35rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.modal-close {
  position: absolute;
  top: 0.45rem;
  right: 0.65rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
}

.modal-close:hover {
  color: var(--ink);
}

body.modal-open {
  overflow: hidden;
}

.app-dialog-backdrop {
  z-index: 60;
}

.app-dialog-title {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  line-height: 1.2;
}

.app-dialog-message {
  margin: 0 0 1.15rem;
  color: var(--muted);
  white-space: pre-wrap;
}

.app-dialog-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
}

.frame-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding: 0.75rem 1rem;
  background: var(--banner-bg);
  border-bottom: 1px solid var(--banner-line);
  color: var(--ink);
  font-size: 0.95rem;
}

.frame-banner .btn {
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
}

.user-chip {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.score-panel {
  text-align: center;
}

.score-eyebrow {
  margin: 0.25rem 0 0.35rem;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.score-display {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 4.5rem);
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--accent);
  margin: 0.2rem 0;
}

.score-percent {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0.35rem 0 0.25rem;
}

.score-meta {
  color: var(--muted);
  margin: 0 0 1.25rem;
}

.score-breakdown {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0 auto 1.5rem;
  max-width: 28rem;
}

.score-stat {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.85rem 0.5rem;
  background: var(--card);
}

.score-stat strong {
  display: block;
  font-size: 1.45rem;
  line-height: 1.1;
}

.score-stat span {
  color: var(--muted);
  font-size: 0.9rem;
}

.score-stat.ok strong {
  color: var(--ok);
}

.score-stat.bad strong {
  color: var(--danger);
}

.score-actions {
  justify-content: center;
}

@media (max-width: 640px) {
  .score-breakdown {
    grid-template-columns: 1fr;
  }
}

.btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 0.85rem 1.4rem;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

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

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 20px rgba(15, 92, 76, 0.22);
}

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

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-secondary:hover {
  background: rgba(28, 36, 48, 0.04);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn:disabled:hover {
  transform: none;
  background: inherit;
}

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

.btn-secondary:disabled:hover {
  background: transparent;
}

.meta {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.topbar h1,
.panel h1,
.panel h2 {
  font-family: var(--font-display);
  margin: 0;
  letter-spacing: -0.02em;
}

.progress {
  color: var(--muted);
  font-weight: 600;
}

.exam-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  margin-bottom: 0.85rem;
}

.bank-pill {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--chip-bg);
  color: var(--ink);
}

.bank-pill.bank-practice {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.bank-pill.bank-knowledge {
  background: var(--chip-bg);
  border-color: var(--line);
  color: var(--muted);
}

.detail .bank-pill {
  margin-right: 0.4rem;
  margin-bottom: 0.45rem;
}

.panel {
  padding: 1.75rem;
}

.question-text {
  font-size: 1.15rem;
  white-space: pre-wrap;
  margin: 0 0 1.25rem;
}

.question-text pre,
.question-text code {
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.88rem;
}

.question-text pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
}

.question-text .question-image,
.detail .question-image {
  display: block;
  max-width: min(100%, 560px);
  width: auto;
  height: auto;
  margin: 0.85rem 0 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--input-bg);
}

.match-board {
  display: grid;
  gap: 1.1rem;
}

.match-panel-label {
  font-weight: 700;
  font-size: 0.92rem;
  margin-bottom: 0.55rem;
  color: var(--muted);
}

.match-right-panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.85rem 1rem;
  background: var(--filter-bg);
}

.match-right-item {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.65rem;
  align-items: start;
  padding: 0.35rem 0;
}

.match-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
}

.match-left-panel {
  display: grid;
  gap: 0.55rem;
}

.match-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 4.5rem;
  gap: 0.55rem;
  align-items: center;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--option-bg);
}

.match-row.is-correct {
  border-color: var(--ok);
  background: var(--answer-correct-bg);
  color: var(--answer-correct-ink);
}

.match-row.is-wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.match-left-label {
  font-weight: 600;
}

.match-arrow {
  color: var(--muted);
  font-weight: 700;
}

.match-select {
  appearance: none;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.4rem 0.45rem;
  font: inherit;
  font-weight: 700;
  text-align: center;
  background: var(--input-bg);
  color: var(--ink);
}

.match-select:disabled {
  opacity: 0.85;
}

.match-reveal {
  grid-column: 1 / -1;
  font-size: 0.92rem;
  color: var(--muted);
}

.match-reveal::before {
  content: "Correct: ";
  font-weight: 700;
  color: var(--ink);
}

@media (max-width: 640px) {
  .match-row {
    grid-template-columns: minmax(0, 1fr) 3.75rem;
  }
  .match-arrow {
    display: none;
  }
}

.options {
  display: grid;
  gap: 0.7rem;
}

.option {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.8rem;
  align-items: start;
  padding: 0.95rem 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--option-bg);
  cursor: pointer;
  transition: border-color 140ms ease, background 140ms ease;
}

.option:hover {
  border-color: var(--accent);
  background: var(--option-hover);
}

.option.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.option.answer-correct {
  border-color: var(--ok);
  background: var(--answer-correct-bg);
  color: var(--answer-correct-ink);
}

.option.answer-wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.option.answer-correct-missed {
  border-color: var(--answer-missed-border);
  background: var(--answer-missed-bg);
  color: var(--answer-missed-ink);
}

.option.locked {
  cursor: default;
  pointer-events: none;
}

.option.locked:hover {
  border-color: inherit;
  background: inherit;
  color: inherit;
}

.option.answer-correct.locked:hover {
  border-color: var(--ok);
  background: var(--answer-correct-bg);
  color: var(--answer-correct-ink);
}

.option.answer-wrong.locked:hover {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.option.answer-correct-missed.locked:hover {
  border-color: var(--answer-missed-border);
  background: var(--answer-missed-bg);
  color: var(--answer-missed-ink);
}

.option input {
  margin-top: 0.2rem;
}

.instant-feedback {
  margin-top: 1.1rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.instant-feedback.is-correct {
  background: var(--ok-soft);
  border-color: #a7d0b4;
}

.instant-feedback.is-wrong {
  background: var(--danger-soft);
  border-color: #e0b4b4;
}

.instant-feedback .status {
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.instant-feedback .feedback-body {
  white-space: normal;
  line-height: 1.45;
}

.instant-feedback .feedback-remix-hint {
  margin-top: 0.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  opacity: 0.9;
}

.instant-feedback.is-correct .status {
  color: var(--ok);
}

.instant-feedback.is-wrong .status {
  color: var(--danger);
}

.nav-row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.results-list {
  display: grid;
  gap: 0.85rem;
}

.result-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  transition: border-color 140ms ease, transform 140ms ease;
}

.result-card:hover {
  border-color: #9eb9b1;
  transform: translateY(-1px);
}

.result-card .score {
  font-weight: 700;
  color: var(--accent);
}

.empty {
  color: var(--muted);
  padding: 1rem 0;
}

.summary {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
}

.summary .big-score {
  font-family: var(--font-display);
  font-size: 2.4rem;
  letter-spacing: -0.03em;
}

.detail {
  border-top: 1px solid var(--line);
  padding: 1.1rem 0;
}

.detail:first-of-type {
  border-top: 0;
}

.badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  margin-bottom: 0.45rem;
}

.badge.ok {
  background: var(--ok-soft);
  color: var(--ok);
}

.badge.bad {
  background: var(--danger-soft);
  color: var(--danger);
}

.detail .q {
  font-weight: 650;
  margin-bottom: 0.45rem;
  white-space: pre-wrap;
}

.detail .choice {
  color: var(--muted);
  font-size: 0.95rem;
}

.detail .choice strong {
  color: var(--ink);
}

.detail .why {
  margin-top: 0.55rem;
  padding: 0.7rem 0.85rem;
  background: var(--code-bg);
  border-radius: 10px;
  font-size: 0.95rem;
}

.loading,
.error {
  padding: 2rem;
  text-align: center;
  color: var(--muted);
}

.error {
  color: var(--danger);
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 1.25rem, 920px);
    padding-top: 1.5rem;
  }

  .hero,
  .panel {
    padding: 1.35rem;
  }

  .nav-row,
  .result-card,
  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .actions .btn,
  .nav-row .btn {
    width: 100%;
    text-align: center;
  }
}