:root {
  --bg: #f6efe8;
  --panel: rgba(255, 252, 247, 0.82);
  --panel-strong: #fffaf3;
  --text: #172127;
  --muted: #5f6c76;
  --line: rgba(23, 33, 39, 0.1);
  --primary: #0f7b6c;
  --primary-deep: #095447;
  --accent: #ff8a5b;
  --accent-soft: #ffd8ca;
  --gold: #ffd36b;
  --shadow: 0 24px 60px rgba(49, 55, 60, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Outfit", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 211, 107, 0.5), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 123, 108, 0.16), transparent 25%),
    linear-gradient(180deg, #fff8f1 0%, var(--bg) 45%, #efe6dd 100%);
}

button {
  font: inherit;
}

.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.hero {
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 32px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(255, 250, 243, 0.7)),
    rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.topbar,
.hero-grid,
.section-heading,
.card-heading,
.planner-grid,
.workspace-grid,
.topic-grid,
.hero-actions,
.quiz-options,
.quiz-controls,
.flashcard-controls,
.ai-controls,
.modal-actions,
.topbar-actions {
  display: flex;
}

.topbar,
.section-heading,
.card-heading {
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
}

.topbar-actions {
  gap: 12px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #ff5d73);
  box-shadow: 0 16px 30px rgba(255, 138, 91, 0.35);
}

.eyebrow,
.kicker,
.panel-label,
.topic-tag,
.badge {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.eyebrow,
.panel-label,
.badge,
.topic-tag {
  color: var(--primary);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 1;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.4rem);
}

h3 {
  font-size: 1.4rem;
}

p {
  margin: 0;
  line-height: 1.6;
}

.kicker {
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 18px;
}

.hero-grid {
  gap: 22px;
  margin-top: 34px;
  align-items: stretch;
}

.hero-copy,
.progress-panel,
.study-card,
.topic-tile,
.planner-step {
  border-radius: 28px;
}

.hero-copy {
  flex: 1.5;
  padding: 18px 8px 18px 6px;
}

.hero-text,
.section-copy,
.quiz-meta,
.answer-rationale,
.placeholder-text {
  color: var(--muted);
}

.hero-actions {
  gap: 12px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.primary-button,
.secondary-button,
.ghost-button,
.topic-button,
.option-button,
.quiz-submit,
.card-action {
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.primary-button,
.quiz-submit {
  padding: 14px 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  color: white;
  box-shadow: 0 18px 32px rgba(15, 123, 108, 0.26);
}

.secondary-button,
.ghost-button,
.topic-button,
.card-action {
  padding: 13px 18px;
  background: white;
  color: var(--text);
  border: 1px solid var(--line);
}

.primary-button:hover,
.secondary-button:hover,
.ghost-button:hover,
.topic-button:hover,
.option-button:hover,
.quiz-submit:hover,
.card-action:hover {
  transform: translateY(-2px);
}

.progress-panel {
  width: min(320px, 100%);
  padding: 22px;
  background: linear-gradient(180deg, rgba(15, 123, 108, 0.09), rgba(255, 255, 255, 0.9));
  border: 1px solid rgba(15, 123, 108, 0.14);
}

.stat {
  padding: 16px 0;
  border-bottom: 1px solid rgba(15, 123, 108, 0.12);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.stat strong {
  font-size: 1.6rem;
}

.streak-card {
  margin-top: 18px;
  padding: 16px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.8);
}

main {
  margin-top: 28px;
}

.topic-section,
.study-card {
  margin-top: 26px;
}

.topic-grid,
.planner-grid,
.workspace-grid {
  gap: 18px;
}

.topic-grid,
.planner-grid {
  flex-wrap: wrap;
}

.topic-grid {
  margin-top: 18px;
}

.topic-tile,
.study-card,
.planner-step {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.topic-tile {
  flex: 1 1 220px;
  min-width: 220px;
  padding: 20px;
  display: grid;
  gap: 12px;
}

.topic-tile.is-active {
  border-color: rgba(255, 138, 91, 0.5);
  background: linear-gradient(180deg, rgba(255, 138, 91, 0.14), rgba(255, 255, 255, 0.82));
}

.topic-tile h3 {
  font-size: 1.2rem;
}

.topic-meta {
  color: var(--muted);
  font-size: 0.94rem;
}

.workspace-grid {
  align-items: flex-start;
}

.study-card {
  flex: 1;
  min-width: 0;
  padding: 24px;
}

.quiz-card,
.flashcard-card {
  min-height: 460px;
}

.badge {
  padding: 9px 12px;
  border-radius: 999px;
  background: rgba(15, 123, 108, 0.1);
  font-weight: 700;
}

.quiz-meta {
  margin-top: 10px;
}

.quiz-area,
.flashcard-area {
  margin-top: 22px;
}

.question-block {
  display: grid;
  gap: 16px;
}

.question-progress {
  color: var(--accent);
  font-weight: 700;
}

.question-prompt {
  font-size: 1.18rem;
  font-weight: 600;
}

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

.option-button {
  text-align: left;
  padding: 15px 16px;
  background: white;
  border: 1px solid rgba(23, 33, 39, 0.1);
}

.option-button.selected {
  border-color: rgba(15, 123, 108, 0.45);
  background: rgba(15, 123, 108, 0.08);
}

.option-button.correct {
  border-color: rgba(15, 123, 108, 0.48);
  background: rgba(15, 123, 108, 0.14);
}

.option-button.incorrect {
  border-color: rgba(200, 57, 57, 0.4);
  background: rgba(200, 57, 57, 0.12);
}

.quiz-controls,
.flashcard-controls,
.ai-controls,
.modal-actions {
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.ai-section {
  margin-top: 16px;
  padding: 16px;
  border-radius: 16px;
  background: rgba(15, 123, 108, 0.06);
  border: 1px solid rgba(15, 123, 108, 0.1);
}

.section-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 12px 0;
}

.ai-status {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 0.9rem;
  min-height: 20px;
}

.ai-status.loading {
  background: rgba(255, 211, 107, 0.2);
  color: var(--primary);
}

.ai-status.success {
  background: rgba(15, 123, 108, 0.15);
  color: var(--primary-deep);
}

.ai-status.error {
  background: rgba(200, 57, 57, 0.15);
  color: #c83939;
}

#ai-topic-input {
  flex: 1;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 0.95rem;
  min-width: 200px;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: white;
  border-radius: 24px;
  padding: 24px;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.3rem;
}

.close-button {
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--muted);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-button:hover {
  color: var(--text);
}

.modal-text {
  color: var(--muted);
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.modal-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 12px;
}

.modal-hint a {
  color: var(--primary);
  text-decoration: none;
}

.modal-hint a:hover {
  text-decoration: underline;
}

.modal-hint code {
  background: rgba(15, 123, 108, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  color: var(--primary-deep);
  font-size: 0.9em;
}

#openai-api-key-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-family: monospace;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.answer-rationale,
.quiz-result {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
}

.quiz-result strong {
  color: var(--primary);
}

.flashcard {
  min-height: 250px;
  padding: 24px;
  border-radius: 28px;
  background:
    linear-gradient(160deg, rgba(255, 138, 91, 0.14), rgba(255, 255, 255, 0.92)),
    var(--panel-strong);
  border: 1px solid rgba(255, 255, 255, 0.8);
  display: grid;
  align-content: space-between;
  gap: 16px;
}

.flashcard-label {
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.76rem;
}

.flashcard-front,
.flashcard-back {
  font-size: 1.12rem;
}

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

.planner-card {
  margin-top: 28px;
}

.planner-grid {
  margin-top: 20px;
}

.planner-step {
  flex: 1 1 220px;
  min-width: 220px;
  padding: 20px;
}

.planner-step span {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 14px;
  border-radius: 12px;
  background: rgba(255, 211, 107, 0.35);
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
}

@media (max-width: 900px) {
  .topbar,
  .hero-grid,
  .section-heading,
  .card-heading,
  .workspace-grid {
    flex-direction: column;
    align-items: flex-start;
  }

  .progress-panel {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 18px, 1180px);
  }

  .hero,
  .study-card,
  .topic-tile,
  .planner-step {
    border-radius: 24px;
  }

  .study-card,
  .topic-tile,
  .planner-step,
  .progress-panel {
    padding: 18px;
  }

  h1 {
    font-size: 2.3rem;
  }
}