:root {
  --bg-a: #fff0d9;
  --bg-b: #d9ecff;
  --panel: #ffffff;
  --ink: #1d2030;
  --muted: #545a6f;
  --line: #d7ddf0;
  --blue: #2f63f2;
  --blue-2: #2754ce;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #f59e0b;
  --shadow: 0 15px 35px -20px rgba(20, 23, 41, 0.45);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 5% 5%, var(--bg-a) 0%, transparent 34%),
    radial-gradient(circle at 100% 0, #ffd9ec 0%, transparent 25%),
    linear-gradient(155deg, #e9f4ff, var(--bg-b));
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: linear-gradient(120deg, #2a57da, #2f91f2);
  color: #fff;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.3rem, 3vw, 1.8rem);
}

.brand p {
  margin: 0.25rem 0 0;
  opacity: 0.9;
}

.layout {
  width: min(980px, 94vw);
  margin: 1rem auto 2rem;
  display: grid;
  gap: 0.9rem;
}

.page-view {
  display: grid;
  gap: 0.9rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.95rem;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

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

textarea,
input,
select,
button {
  font: inherit;
}

textarea,
input,
select {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: #fff;
}

textarea {
  resize: vertical;
}

label span {
  font-weight: 700;
}

.btn {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.54rem 0.85rem;
  background: var(--blue);
  color: #fff;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease;
}

.btn:hover {
  background: var(--blue-2);
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.btn.ghost {
  background: #fff;
  color: var(--blue);
  border-color: var(--blue);
}

.btn.active-nav {
  background: var(--amber);
  border-color: var(--amber);
  color: #2d1b00;
}

.btn.danger {
  background: var(--red);
}

.btn.danger:hover {
  background: #b91c1c;
}

.btn.correct,
.btn.correct:hover {
  background: var(--green);
}

.btn.wrong,
.btn.wrong:hover {
  background: var(--red);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.6rem;
}

.grid.two {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.inline-options {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.7rem 0;
}

.inline-options label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.inline-options input {
  width: auto;
  margin: 0;
}

.status {
  min-height: 1.1rem;
  margin-top: 0.45rem;
}

.status.ok {
  color: var(--green);
}

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

.quiz-list {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.65rem;
}

.quiz-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.55rem;
  background: #fefefe;
}

.quiz-item.manage-item {
  display: grid;
  gap: 0.55rem;
}

.quiz-item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
}

.removed-list {
  display: grid;
  gap: 0.4rem;
  border-top: 1px solid var(--line);
  padding-top: 0.55rem;
}

.removed-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  background: #fff6f6;
  border: 1px solid #f4d2d2;
  border-radius: 8px;
  padding: 0.45rem;
}

.quiz-item label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.quiz-item input[type="checkbox"] {
  width: auto;
  margin: 0;
}

.question-header {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
}

.chip {
  display: inline-flex;
  margin: 0.2rem 0 0;
  padding: 0.18rem 0.52rem;
  background: #fdf0d2;
  border: 1px solid #f6d48a;
  border-radius: 999px;
  color: #7a5200;
}

.question {
  font-size: 1.05rem;
}

.answers {
  display: grid;
  gap: 0.52rem;
}

.answers label {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 0.55rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.58rem;
  background: #fcfdff;
}

.answers input {
  width: auto;
  margin-top: 0.15rem;
}

.history-list {
  margin-top: 0.65rem;
  display: grid;
  gap: 0.45rem;
}

.history-entry {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.5rem;
  background: #f5f9ff;
}

#missedQuestionsList {
  padding-left: 1.1rem;
}

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .topnav {
    width: 100%;
  }

  .question-header {
    flex-direction: column;
  }

  .quiz-item-head,
  .removed-item {
    flex-direction: column;
    align-items: flex-start;
  }
}