:root {
  color-scheme: only light;
  --bg: #f6efe4;
  --bg-accent: #f2c7a2;
  --bg-ink: #191717;
  --card: #ffffff;
  --muted: #5c5248;
  --accent: #ff6a3d;
  --accent-2: #177e89;
  --accent-3: #f4a261;
  --outline: rgba(25, 23, 23, 0.12);
  --shadow: 0 30px 80px rgba(25, 23, 23, 0.18);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--bg-ink);
  background: radial-gradient(
      1200px 600px at 90% -10%,
      rgba(244, 162, 97, 0.4),
      transparent 60%
    ),
    radial-gradient(
      900px 450px at -10% 20%,
      rgba(23, 126, 137, 0.25),
      transparent 55%
    ),
    linear-gradient(120deg, var(--bg), var(--bg-accent));
  overflow-x: hidden;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(
    rgba(0, 0, 0, 0.08) 1px,
    transparent 1px
  );
  background-size: 6px 6px;
  opacity: 0.15;
  mix-blend-mode: multiply;
}

.shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 20px 80px;
  position: relative;
}

.shell::before,
.shell::after {
  content: "";
  position: absolute;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  filter: blur(0);
  opacity: 0.4;
  z-index: -1;
}

.shell::before {
  top: 120px;
  right: -60px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
}

.shell::after {
  bottom: 140px;
  left: -60px;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
}

.hero {
  display: grid;
  gap: 16px;
  margin-bottom: 40px;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(25, 23, 23, 0.08);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 12px;
}

.hero h1 {
  margin: 0;
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: clamp(36px, 4vw, 56px);
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0;
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.5;
}

.panel {
  display: none;
  gap: 24px;
  background: var(--card);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(25, 23, 23, 0.08);
  animation: panelIn 0.5s ease;
}

.panel.active {
  display: grid;
}

.start-panel {
  position: relative;
  min-height: 65vh;
}

.start-center {
  display: grid;
  place-items: center;
  text-align: center;
  gap: 16px;
  padding: 24px;
}

.start-center h2 {
  margin: 0;
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: clamp(28px, 3vw, 36px);
}

.start-center p {
  margin: 0;
  color: var(--muted);
  max-width: 520px;
}

.start-actions {
  display: grid;
  gap: 12px;
  align-items: center;
  justify-items: center;
}

.import-panel {
  position: absolute;
  right: 28px;
  bottom: 28px;
  width: 280px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(25, 23, 23, 0.1);
  border-radius: 18px;
  padding: 18px;
  display: grid;
  gap: 12px;
  box-shadow: 0 18px 40px rgba(25, 23, 23, 0.15);
}

.import-head h3 {
  margin: 0 0 6px;
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 18px;
}

.import-head p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.panel-head h2 {
  margin: 0 0 8px;
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 28px;
}

.panel-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.study-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.study-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.study-actions input {
  border-radius: 999px;
  border: 1px solid rgba(25, 23, 23, 0.18);
  padding: 10px 14px;
  font-family: inherit;
  min-width: 220px;
}

.dropzone {
  position: relative;
  border: 2px dashed rgba(25, 23, 23, 0.2);
  border-radius: 20px;
  padding: 36px;
  text-align: center;
  background: linear-gradient(
    130deg,
    rgba(255, 255, 255, 0.85),
    rgba(255, 255, 255, 0.6)
  );
  transition: border 0.2s ease, transform 0.2s ease;
}

.dropzone.compact {
  padding: 16px;
}

.dropzone.dragover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.dropzone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.dropzone-copy {
  display: grid;
  gap: 8px;
}

.dropzone-title {
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 22px;
}

.dropzone.compact .dropzone-title {
  font-size: 16px;
}

.dropzone.compact .dropzone-sub {
  font-size: 12px;
}

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

.load-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

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

.btn {
  border: none;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.btn.primary {
  background: var(--bg-ink);
  color: #fff;
  box-shadow: 0 12px 30px rgba(25, 23, 23, 0.2);
}

.btn.accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 30px rgba(255, 106, 61, 0.35);
}

.btn.ghost {
  background: transparent;
  border: 1px solid var(--outline);
}

.btn:not(:disabled):hover {
  transform: translateY(-2px);
}

.quiz-top {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.progress {
  background: rgba(25, 23, 23, 0.08);
  border-radius: 999px;
  overflow: hidden;
  height: 10px;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.3s ease;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: var(--muted);
}

.quiz-card {
  background: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.95),
    rgba(255, 255, 255, 0.8)
  );
  border-radius: 20px;
  padding: 28px;
  border: 1px solid rgba(25, 23, 23, 0.08);
  display: grid;
  gap: 24px;
  min-height: 280px;
  animation: rise 0.4s ease;
}

.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.question-tag {
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(23, 126, 137, 0.1);
  color: var(--accent-2);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.question-title {
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 24px;
  margin: 0;
  line-height: 1.4;
}

.option-list {
  display: grid;
  gap: 12px;
}

.match-grid {
  display: grid;
  gap: 12px;
}

.match-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 12px;
  border-radius: 14px;
  background: rgba(25, 23, 23, 0.04);
  border: 1px solid transparent;
}

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

.match-select {
  width: 100%;
  border-radius: 12px;
  border: 1px solid rgba(25, 23, 23, 0.2);
  padding: 10px 12px;
  font-family: inherit;
  background: #fff;
}

.option {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid transparent;
  background: rgba(25, 23, 23, 0.04);
  transition: border 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.option input {
  margin-top: 4px;
}

.option span {
  line-height: 1.4;
}

.option:hover {
  border-color: rgba(25, 23, 23, 0.2);
  transform: translateY(-1px);
}

.option input:checked + span {
  font-weight: 600;
}

.quiz-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.stat-card {
  padding: 20px;
  border-radius: 16px;
  border: 1px solid rgba(25, 23, 23, 0.1);
  background: rgba(255, 255, 255, 0.9);
}

.stat-label {
  color: var(--muted);
  font-size: 13px;
}

.stat-value {
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 28px;
  margin-top: 6px;
}

.score-ring {
  display: grid;
  place-items: center;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: conic-gradient(
    var(--accent) 0deg,
    rgba(25, 23, 23, 0.08) 0deg
  );
  margin: 0 auto;
}

.score-value {
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 32px;
}

.score-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.review {
  display: grid;
  gap: 16px;
}

.review h3 {
  margin: 0;
  font-family: "Bricolage Grotesque", sans-serif;
}

.review-list {
  display: grid;
  gap: 16px;
}

.study-list {
  display: grid;
  gap: 16px;
}

.study-card {
  padding: 20px;
  border-radius: 16px;
  border: 1px solid rgba(25, 23, 23, 0.12);
  background: rgba(255, 255, 255, 0.92);
  display: grid;
  gap: 12px;
}

.study-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.study-title {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
}

.study-options {
  display: grid;
  gap: 8px;
  padding-left: 18px;
  margin: 0;
}

.study-options li {
  line-height: 1.4;
}

.study-options li.is-correct {
  font-weight: 600;
  color: var(--accent-2);
}

.review-card {
  padding: 20px;
  border-radius: 16px;
  border: 1px solid rgba(255, 106, 61, 0.3);
  background: rgba(255, 106, 61, 0.08);
  display: grid;
  gap: 12px;
}

.review-card h4 {
  margin: 0;
  font-size: 18px;
}

.review-row {
  display: grid;
  gap: 6px;
  font-size: 14px;
}

.review-row strong {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

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

.disclaimer {
  margin-top: 32px;
  text-align: center;
  font-size: 12px;
  color: rgba(25, 23, 23, 0.45);
}

@keyframes panelIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .panel {
    padding: 24px;
  }

  .start-panel {
    min-height: auto;
  }

  .import-panel {
    position: static;
    width: 100%;
  }

  .study-head {
    flex-direction: column;
    align-items: stretch;
  }

  .study-actions {
    width: 100%;
    justify-content: space-between;
  }

  .study-actions input {
    min-width: 0;
    flex: 1;
  }

  .quiz-actions {
    flex-direction: column;
  }

  .score-ring {
    width: 130px;
    height: 130px;
  }
}