:root {
  color-scheme: light dark;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", "Segoe UI", Arial, sans-serif;
  --font-serif: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", "Segoe UI", Arial, sans-serif;

  --bg: #f7f7f7;
  --bg-accent: #efe8e2;
  --card: #ffffff;
  --text: #1a1a1a;
  --muted: #5d5a55;
  --line: #e2ded8;
  --accent: #00a6f4;
  --accent-2: #f9d648;
  --shadow: 0 20px 60px rgba(26, 26, 26, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-accent: #1a1e22;
    --card: #161a1f;
    --text: #f2f2f2;
    --muted: #a5a5a5;
    --line: #2b3138;
    --accent: #00bcff;
    --accent-2: #ffd166;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 48px 20px 32px;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--bg);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 100%;
  width: 100%;
  margin: 0 0 36px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-mark {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: none;
}

.logo-light {
  display: block;
}

@media (prefers-color-scheme: dark) {
  .logo-light {
    display: none;
  }

  .logo-dark {
    display: block;
  }
}

.brand-text h1 {
  margin: 0 0 6px;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  letter-spacing: -0.02em;
}

.brand-text p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.faq {
  max-width: 100%;
  width: 100%;
  margin: 0;
  display: grid;
  gap: 24px;
}

.section {
  padding: 8px 0;
  display: grid;
  gap: 18px;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.section-title {
  font-size: 1.4rem;
  margin: 0;
  font-weight: 600;
}

.section-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.accordion {
  display: grid;
  gap: 12px;
}

.accordion-item {
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.6);
  transition: border 0.2s ease, transform 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  .accordion-item {
    background: rgba(22, 26, 31, 0.7);
  }
}

.accordion-item.open {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.accordion-button {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text);
  padding: 18px 20px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  text-align: left;
}

.accordion-button span {
  font-weight: 500;
}

.accordion-button::after {
  content: "+";
  font-size: 1.4rem;
  line-height: 1;
  transition: transform 0.2s ease;
}

.accordion-item.open .accordion-button::after {
  content: "–";
  transform: rotate(180deg);
}

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.accordion-panel-content {
  padding: 0 20px 20px;
  color: var(--muted);
  font-family: var(--font-serif);
  line-height: 1.6;
}

.accordion-panel-content h1,
.accordion-panel-content h2,
.accordion-panel-content h3 {
  color: var(--text);
}

.accordion-panel-content ul,
.accordion-panel-content ol {
  padding-left: 20px;
}

.site-footer {
  margin: 40px auto 0;
  color: var(--muted);
  font-size: 0.85rem;
  min-height: 12px;
}

@media (min-width: 900px) {
  .site-header,
  .faq {
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 800px) {
  body {
    padding: 24px 12px 24px;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .brand-mark {
    width: 48px;
    height: 48px;
  }

  .section {
    padding: 22px;
  }
}

@media (max-width: 560px) {
  body {
    padding-left: 8px;
    padding-right: 8px;
  }

  .section {
    padding: 0;
  }

  .accordion-button {
    padding: 16px;
  }

  .accordion-panel-content {
    padding: 0 16px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}