/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #faf9f6;
  --color-text: #1a1a1a;
  --color-text-secondary: #555;
  --color-accent: #d4845a;
  --color-accent-dark: #a0633e;
  --color-card-project: #8b5e3c;
  --color-card-local: #b38060;
  --color-card-global: #c8b898;
  --color-code-bg: #2d2d2d;
  --color-code-text: #f8f8f2;
  --color-section-alt: #f0ece4;
  --color-tip-bg: #fdf6ee;
  --color-tip-border: #d4845a;
  --color-correct: #4caf50;
  --color-incorrect: #e74c3c;
  --font-body: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --max-width: 960px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 17px;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
nav {
  position: sticky;
  top: 0;
  background: rgba(250, 249, 246, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e0dcd4;
  z-index: 100;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 24px;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-accent-dark);
}

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.hero-note {
  margin-top: 16px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.hero-note a {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* Sections */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-section-alt);
}

.section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}

.section p {
  margin-bottom: 16px;
  color: var(--color-text-secondary);
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 32px 0;
}

.card {
  border-radius: 16px;
  padding: 28px 24px;
  color: #fff;
  position: relative;
  min-height: 200px;
}

.card h3 {
  color: #fff;
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 1.15rem;
}

.card ul {
  list-style: disc;
  padding-left: 20px;
}

.card li {
  margin-bottom: 8px;
  font-size: 0.95rem;
  line-height: 1.5;
}

.card-tag {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(255, 255, 255, 0.2);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-project {
  background: var(--color-card-project);
}

.card-local {
  background: var(--color-card-local);
}

.card-global {
  background: var(--color-card-global);
  color: var(--color-text);
}

.card-global h3 {
  color: var(--color-text);
}

.card-global .card-tag {
  background: rgba(0, 0, 0, 0.1);
}

/* Code blocks */
.code-block {
  margin: 20px 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

.code-header {
  background: #1e1e1e;
  color: #999;
  padding: 10px 20px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  border-bottom: 1px solid #3a3a3a;
}

.code-block pre {
  background: var(--color-code-bg);
  margin: 0;
  padding: 20px;
  overflow-x: auto;
}

.code-block code {
  color: var(--color-code-text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Inline code */
code {
  background: rgba(0, 0, 0, 0.06);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

/* Tip box */
.tip {
  background: var(--color-tip-bg);
  border-left: 4px solid var(--color-tip-border);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
}

.tip strong {
  color: var(--color-accent-dark);
}

.tip p {
  margin: 0;
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 32px 0;
}

.feature {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-section-alt);
  border-radius: 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-accent-dark);
  margin-bottom: 12px;
}

.feature h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.feature p {
  font-size: 0.92rem;
  margin: 0;
}

/* Workflow steps */
.workflow-steps {
  padding-left: 24px;
  margin: 16px 0 24px;
}

.workflow-steps li {
  margin-bottom: 10px;
  color: var(--color-text-secondary);
  padding-left: 8px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

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

.btn {
  background: var(--color-accent);
  color: #fff;
}

.btn:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}

/* Quiz */
.quiz-question {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
}

.quiz-question h4 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.quiz-question p {
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.quiz-question .question-number {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border: 2px solid #e0dcd4;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  font-size: 0.95rem;
}

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

.quiz-option.selected {
  border-color: var(--color-accent);
  background: var(--color-tip-bg);
}

.quiz-option.correct {
  border-color: var(--color-correct);
  background: #e8f5e9;
}

.quiz-option.incorrect {
  border-color: var(--color-incorrect);
  background: #fdecea;
}

.quiz-options.preview .quiz-option {
  cursor: default;
  pointer-events: none;
}

.quiz-option input[type="radio"] {
  accent-color: var(--color-accent);
}

.quiz-results {
  background: #fff;
  border-radius: 12px;
  padding: 32px;
  text-align: center;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
}

.quiz-results h3 {
  margin-top: 0;
}

#quiz-score {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.quiz-explanation {
  margin-top: 8px;
  padding: 10px 14px;
  background: #f9f9f7;
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  display: none;
}

.quiz-explanation.visible {
  display: block;
}

/* Quiz setup */
.quiz-setup-box {
  background: #fff;
  border-radius: 12px;
  padding: 40px;
  max-width: 480px;
  margin: 0 auto;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
  text-align: center;
}

.quiz-setup-box h2 {
  margin-bottom: 12px;
}

.quiz-setup-box p {
  margin-bottom: 24px;
}

.setup-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.setup-controls label {
  font-weight: 600;
  font-size: 0.95rem;
}

.setup-controls input[type="number"] {
  width: 100px;
  padding: 10px 14px;
  font-size: 1.1rem;
  text-align: center;
  border: 2px solid #e0dcd4;
  border-radius: 8px;
  font-family: var(--font-body);
}

.setup-controls input[type="number"]:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 24px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  border-top: 1px solid #e0dcd4;
}

footer p {
  margin-bottom: 6px;
}

footer a {
  color: var(--color-accent-dark);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }
}