/* ========================================
   MoonLog — Brand Stylesheet
   ======================================== */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --color-primary: #6366F1;
  --color-secondary: #8B5CF6;
  --color-bg: #13141A;
  --color-card: #1E1F26;
  --color-card-hover: #262730;
  --color-text: #FFFFFF;
  --color-text-secondary: #9CA3AF;
  --color-border: #2D2E3A;
  --color-gradient: linear-gradient(135deg, #6366F1, #8B5CF6);
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 800px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-secondary);
}

/* ---------- Header ---------- */
.site-header {
  background: var(--color-gradient);
  padding: 0;
  position: relative;
  overflow: hidden;
}

.site-header::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 50%;
  pointer-events: none;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: 30%;
  width: 120px;
  height: 120px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 50%;
  pointer-events: none;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 36px;
  position: relative;
  z-index: 1;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
}

.brand img {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.brand h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-subtitle {
  font-size: 0.95rem;
  opacity: 0.85;
  margin-top: 4px;
  padding-left: 68px;
}

/* ---------- Navigation ---------- */
.site-nav {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.nav-inner a {
  display: inline-block;
  padding: 14px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.nav-inner a:hover,
.nav-inner a.active {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

/* ---------- Main Content ---------- */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 60px;
  width: 100%;
}

/* ---------- Card ---------- */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 24px;
  transition: border-color var(--transition);
}

.card:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card h2 .icon {
  font-size: 1.3rem;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 20px 0 10px;
  color: var(--color-text);
}

.card p,
.card li {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.card ul {
  list-style: none;
  padding: 0;
}

.card ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
}

.card ul li::before {
  content: '·';
  position: absolute;
  left: 4px;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.8;
}

/* ---------- FAQ (Accordion) ---------- */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 18px 0;
}

.faq-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  user-select: none;
  gap: 12px;
}

.faq-question::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--color-primary);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-question::after {
  content: '−';
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding-top: 12px;
}

.faq-answer p {
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  line-height: 1.8;
}

/* ---------- Contact Banner ---------- */
.contact-banner {
  background: var(--color-gradient);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  margin-top: 12px;
}

.contact-banner h2 {
  justify-content: center;
  margin-bottom: 8px;
}

.contact-banner p {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 20px;
}

.contact-banner .btn {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: background var(--transition);
}

.contact-banner .btn:hover {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  padding: 28px 24px;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
}

.site-footer a {
  color: var(--color-text-secondary);
}

.site-footer a:hover {
  color: var(--color-primary);
}

/* ---------- Index Hero ---------- */
.hero {
  text-align: center;
  padding: 60px 0 40px;
}

.hero img {
  width: 100px;
  height: 100px;
  border-radius: 24px;
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
  margin-bottom: 24px;
}

.hero h2 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.hero p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
}

.hero-links .btn-primary {
  background: var(--color-gradient);
  color: #fff;
}

.hero-links .btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  color: #fff;
}

.hero-links .btn-outline {
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: var(--color-card);
}

.hero-links .btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ---------- Feature Grid (Index) ---------- */
.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 16px;
}

.feature-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), transform var(--transition);
}

.feature-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.feature-card .icon {
  font-size: 1.6rem;
  margin-bottom: 12px;
  display: block;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---------- Effective Date Tag ---------- */
.date-tag {
  display: inline-block;
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 20px;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .header-inner {
    padding: 28px 20px 24px;
  }

  .brand img {
    width: 42px;
    height: 42px;
  }

  .brand h1 {
    font-size: 1.3rem;
  }

  .header-subtitle {
    padding-left: 58px;
    font-size: 0.88rem;
  }

  .main-content {
    padding: 28px 16px 48px;
  }

  .card {
    padding: 24px 20px;
  }

  .hero {
    padding: 40px 0 28px;
  }

  .hero h2 {
    font-size: 1.4rem;
  }

  .hero img {
    width: 80px;
    height: 80px;
  }

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

  .contact-banner {
    padding: 24px 20px;
  }
}