:root {
  --bg: #0b0b0d;
  --surface: #15151a;
  --text: #f4f4f6;
  --muted: #9a9aa3;
  --accent: #f5e249;        /* logo yellow */
  --accent-blue: #4ad0f4;   /* logo cyan */
  --accent-purple: #474b9b; /* logo purple */
  --danger: #e25c5c;
  --ok: #5cd29a;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
}

a { color: var(--accent); }

.centered {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.25rem;
}

/* ---------- homepage ---------- */

body.home {
  background: radial-gradient(circle at 50% 0%, #1a1a22 0%, var(--bg) 60%);
}

.hero {
  max-width: 760px;
  margin: 0 auto;
  padding: 4rem 1.5rem 2rem;
  text-align: center;
  display: grid;
  gap: 1.25rem;
}

.hero .logo {
  width: min(420px, 80vw);
  height: auto;
  margin: 0 auto 1rem;
  filter: drop-shadow(0 6px 20px rgba(245, 226, 73, 0.18));
}

.tagline {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1.15;
  margin: 0 auto;
  max-width: 18ch;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.hero .lede {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 52ch;
  margin: 0 auto;
  line-height: 1.55;
}

.hero-cta {
  display: grid;
  gap: 0.6rem;
  margin-top: 0.5rem;
  justify-items: center;
}

.cta.primary {
  display: inline-block;
  background: var(--accent);
  color: #1a1500;
  padding: 0.95rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 700;
  text-decoration: none;
  font-size: 1rem;
  box-shadow: 0 6px 18px rgba(245, 226, 73, 0.22);
  transition: transform 120ms ease;
}

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

.how-it-works {
  max-width: 980px;
  margin: 3rem auto 0;
  padding: 0 1.5rem 3rem;
}

.how-row {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.how-card {
  background: var(--surface);
  padding: 1.4rem 1.2rem;
  border-radius: 14px;
  border: 1px solid #1f1f25;
}

.how-card h3 {
  margin: 0.4rem 0 0.3rem;
  font-size: 1.05rem;
}

.how-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.how-num {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--accent);
  color: #1a1500;
  font-weight: 800;
  font-size: 0.9rem;
}

.home-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  text-align: center;
}

.home-footer .hint { margin: 0; }

.lede {
  color: var(--muted);
  font-size: 1.1rem;
}

.cta-grid {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.cta {
  display: block;
  background: var(--accent);
  color: #1a1500;
  text-align: center;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
}

.hint {
  color: var(--muted);
  font-size: 0.9rem;
}

input, button {
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius);
  border: 1px solid #2a2a30;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
}

button {
  background: var(--accent);
  color: #1a1500;
  border: none;
  font-weight: 600;
  cursor: pointer;
}

button:disabled { opacity: 0.5; cursor: default; }

ul, ol { padding-left: 1.2rem; }

.result {
  font-weight: 600;
}
.result.correct { color: var(--ok); }
.result.wrong   { color: var(--danger); }

#options li button.answer-correct { border-color: var(--ok); }
#options li button.answer-wrong   { border-color: var(--danger); }

.comp-header h1 { margin-bottom: 0.2rem; }
.comp-header .hint { margin-top: 0; }

#end-screen { text-align: center; }
#end-screen .lede { font-size: 1.3rem; margin: 0.4rem 0; }
#end-screen .row { justify-content: center; gap: 0.6rem; margin-top: 1rem; }

a.ghost-link {
  background: transparent;
  color: var(--text);
  border: 1px solid #2a2a30;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
}

a.deck-name {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}
a.deck-name:hover { color: var(--accent); text-decoration: underline; }

/* deck editor */

.back-link {
  color: var(--muted);
  text-decoration: none;
}
.back-link:hover { color: var(--accent); }
.sep { color: var(--muted); margin: 0 0.3rem; }

.card textarea {
  padding: 0.6rem 0.7rem;
  border-radius: var(--radius);
  border: 1px solid #2a2a30;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  resize: vertical;
}

button.danger {
  color: var(--danger);
  border-color: var(--danger);
}

button.small {
  padding: 0.3rem 0.55rem;
  font-size: 0.8rem;
  min-width: 0;
}

.questions-list {
  display: grid;
  gap: 1rem;
  margin-top: 0.75rem;
}

.question-card {
  background: var(--surface);
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid #1f1f25;
  display: grid;
  gap: 0.6rem;
}

.q-header {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.q-position {
  color: var(--muted);
  font-size: 0.85rem;
  min-width: 2.5rem;
}

.q-category {
  flex: 1;
}

.q-body {
  width: 100%;
}

.options {
  display: grid;
  gap: 0.35rem;
}

.option-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.option-row input[type="radio"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

.option-row .opt-body { flex: 1; }

.q-actions {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  margin-top: 0.2rem;
}

.q-actions .spacer { flex: 1; }

.q-actions button {
  padding: 0.45rem 0.7rem;
  font-size: 0.85rem;
}

.q-status {
  font-size: 0.85rem;
}

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

.studio-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid #1f1f25;
}

.studio-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  gap: 2rem;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.deck-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.deck-list li {
  background: var(--surface);
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.deck-list .state {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

#options {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

#options li button {
  width: 100%;
  text-align: left;
  background: var(--surface);
  color: var(--text);
  border: 1px solid #2a2a30;
}

/* dialogs (HTML5 <dialog>) */

dialog {
  background: var(--surface);
  color: var(--text);
  border: 1px solid #2a2a30;
  border-radius: 14px;
  padding: 0;
  max-width: min(640px, 92vw);
  width: 100%;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px);
}

.dialog-body {
  padding: 1.2rem 1.4rem 1.3rem;
  display: grid;
  gap: 0.85rem;
  margin: 0;
}

.dialog-body h2 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.dialog-body label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.dialog-body input,
.dialog-body select,
.dialog-body textarea {
  background: var(--bg);
  color: var(--text);
  border: 1px solid #2a2a30;
  border-radius: var(--radius);
  padding: 0.6rem 0.7rem;
  font: inherit;
}

.dialog-body textarea { resize: vertical; }

.dialog-body fieldset {
  border: 1px solid #2a2a30;
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  margin: 0;
}

.dialog-body legend {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0 0.4rem;
}

.dialog-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 0.4rem;
}

.dialog-actions button {
  min-width: 5.5rem;
}

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

/* studio polish */

.card {
  background: var(--surface);
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  display: grid;
  gap: 0.85rem;
  margin: 0.75rem 0;
}

.card label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.card fieldset {
  border: 1px solid #2a2a30;
  border-radius: var(--radius);
  padding: 0.75rem;
}

.card legend {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0 0.4rem;
}

button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid #2a2a30;
}

.deck-picker {
  display: grid;
  gap: 0.45rem;
}

.deck-pick {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--text);
  cursor: pointer;
}

.deck-row-main {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.deck-name { font-weight: 600; }

.deck-actions {
  display: flex;
  gap: 0.4rem;
}

.deck-actions button {
  padding: 0.45rem 0.7rem;
  font-size: 0.85rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.6rem;
}

.card select,
.card input[type="number"] {
  padding: 0.6rem 0.7rem;
  border-radius: var(--radius);
  border: 1px solid #2a2a30;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}

.comp-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.comp-list li {
  background: var(--surface);
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
}

.comp-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.comp-name {
  font-weight: 600;
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
}

.comp-actions {
  display: flex;
  gap: 0.4rem;
}

.comp-actions button {
  padding: 0.45rem 0.7rem;
  font-size: 0.85rem;
}