/* ===== CSS Custom Properties ===== */
:root {
  --color-bg: #FDF8F0;
  --color-surface: #FFFFFF;
  --color-text: #3E2C1B;
  --color-text-light: #6B5A4A;
  --color-accent: #D4A373;
  --color-accent-dark: #B5834A;
  --color-secondary: #8B9A6D;
  --color-border: #E3D5C8;
  --color-muted: #F5EDE4;
  --font-heading: Georgia, 'Times New Roman', serif;
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(62, 44, 27, 0.08);
  --shadow-md: 0 4px 12px rgba(62, 44, 27, 0.1);
  --max-width: 1100px;
  --header-height: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-accent);
  color: #fff;
  padding: 8px 16px;
  z-index: 1000;
  text-decoration: none;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  top: 0;
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
}

.logo svg {
  color: var(--color-accent);
}

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

.main-nav a {
  text-decoration: none;
  color: var(--color-text-light);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

/* ===== Hero ===== */
.hero {
  padding: 60px 0 40px;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}

.hero-content {
  flex: 1 1 320px;
}

.hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-visual {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
}

.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 32px;
  border-radius: 50px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  box-shadow: var(--shadow-sm);
}

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

.btn-primary:active {
  transform: translateY(0);
}

/* ===== How It Works ===== */
.how-it-works {
  padding: 50px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.how-it-works h2,
.builder h2,
.tips h2,
.examples h2 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  text-align: center;
  margin-bottom: 12px;
}

.section-intro {
  text-align: center;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto 36px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.step-card {
  background: var(--color-muted);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s;
}

.step-card:hover {
  box-shadow: var(--shadow-md);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.step-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.step-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ===== Builder ===== */
.builder {
  padding: 50px 0;
}

.habit-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  max-width: 700px;
  margin: 0 auto 40px;
  box-shadow: var(--shadow-sm);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input,
.form-group select {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212, 163, 115, 0.2);
}

.habit-form .btn-primary {
  display: block;
  width: 100%;
  margin-top: 12px;
}

/* ===== Timeline Output ===== */
.timeline-output {
  max-width: 700px;
  margin: 0 auto;
  min-height: 80px;
}

.timeline-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  animation: fadeIn 0.4s ease-out;
}

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

.timeline-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: 20px;
  text-align: center;
}

.timeline-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.timeline-item {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 400px;
}

.timeline-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  flex-shrink: 0;
}

.timeline-dot.anchor {
  background: var(--color-accent);
}

.timeline-dot.new {
  background: var(--color-secondary);
}

.timeline-label {
  font-size: 0.95rem;
  color: var(--color-text);
}

.timeline-connector {
  width: 2px;
  height: 24px;
  background: var(--color-border);
  margin-left: 6px;
}

.timeline-note {
  margin-top: 16px;
  font-style: italic;
  color: var(--color-text-light);
  text-align: center;
  font-size: 0.9rem;
}

/* ===== Tips ===== */
.tips {
  padding: 50px 0;
  background: var(--color-muted);
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.tip-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.tip-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.tip-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ===== Examples ===== */
.examples {
  padding: 50px 0;
}

.example-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.example-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.example-chain {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.chain-item {
  background: var(--color-muted);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

.chain-item.anchor {
  background: #F5EDE4;
  color: var(--color-accent-dark);
}

.chain-item.new {
  background: #E9EFE0;
  color: #5C6B3C;
}

.chain-arrow {
  font-size: 1.2rem;
  color: var(--color-text-light);
}

.example-card p {
  color: var(--color-text-light);
  font-size: 0.9rem;
  font-style: italic;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
  margin-top: 20px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-inner p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.footer-inner nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

.footer-inner nav a {
  text-decoration: none;
  color: var(--color-text-light);
  font-size: 0.85rem;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-subtitle {
    max-width: 100%;
  }

  .hero-visual {
    margin-top: 20px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .main-nav ul {
    gap: 14px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header-inner {
    flex-direction: column;
    gap: 8px;
    padding: 8px 0;
  }

  .site-header {
    height: auto;
    padding: 8px 0;
  }

  .main-nav ul {
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding: 30px 0 20px;
  }
}

/* ===== Legal Pages ===== */
.legal-content {
  max-width: 720px;
  margin: 40px auto;
  padding: 0 20px;
}

.legal-content h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-bottom: 24px;
}

.legal-content h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  margin: 28px 0 12px;
}

.legal-content p {
  margin-bottom: 16px;
  color: var(--color-text-light);
}

.about-content {
  max-width: 720px;
  margin: 40px auto;
  padding: 0 20px;
}

.about-content h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-bottom: 24px;
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}