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

:root {
  --bg: #0a0a0a;
  --bg-card: #111111;
  --bg-card-hover: #161616;
  --border: #1e1e1e;
  --text: #e5e5e5;
  --text-muted: #888888;
  --accent: #ffffff;
  --font: 'Inter', 'Noto Sans Thai', -apple-system, BlinkMacSystemFont, sans-serif;
}

html { scroll-behavior: smooth; }
html.i18n-loading body { opacity: 0; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Fade-in ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Nav ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 24px;
  transition: background 0.3s, backdrop-filter 0.3s;
}
.nav.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav__logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}
.nav__cta {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--bg);
  background: var(--accent);
  padding: 8px 20px;
  border-radius: 6px;
  text-decoration: none;
  transition: opacity 0.2s;
}
.nav__cta:hover { opacity: 0.85; }

/* ===== Nav Right Group ===== */
.nav__right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ===== Locale Switcher ===== */
.locale-switch {
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  padding: 5px 14px;
  border-radius: 100px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.locale-switch:hover {
  color: var(--accent);
  border-color: var(--text-muted);
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 80px;
}
.badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero__sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
}

/* ===== Product Card ===== */
.product {
  padding: 40px 0 80px;
}
.product__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
}
.product__meta {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.product__card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}
.product__price {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
}
.product__desc {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 1rem;
}
.product__list {
  list-style: none;
  margin-bottom: 32px;
}
.product__list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  color: var(--text);
  font-size: 0.95rem;
}
.product__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* ===== Context Section (New) ===== */
.context {
  padding: 60px 0;
}
.context p {
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 24px;
  max-width: 640px;
}
.context p:last-child {
  margin-bottom: 0;
}

/* ===== Button ===== */
.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 8px;
  text-decoration: none;
  transition: opacity 0.2s;
  cursor: pointer;
  border: none;
}
.btn:hover { opacity: 0.85; }
.btn--lg {
  font-size: 1.1rem;
  padding: 16px 40px;
}

/* ===== What's Inside ===== */
.inside {
  padding: 80px 0;
}
.inside h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 40px;
}
.inside__grid {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.inside__item {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}
.inside__item:last-child {
  border-bottom: 1px solid var(--border);
}
.inside__num {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 8px;
}
.inside__item h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}
.inside__item p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ===== Author ===== */
.author {
  padding: 80px 0;
}
.author h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 16px;
}
.author p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
}

/* ===== CTA ===== */
.cta {
  padding: 80px 0;
  text-align: center;
}
.cta h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
}
.cta p {
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 1rem;
}

/* ===== Footer ===== */
.footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border);
}
.footer p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== Thai locale body ===== */
body.locale-th {
  line-height: 1.8;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .hero { padding: 120px 0 60px; }
  .product__card { padding: 28px 20px; }
  .nav { padding: 12px 16px; }
  .nav__right { gap: 8px; }
  .locale-switch { padding: 4px 10px; font-size: 0.72rem; }
  .nav__cta { padding: 7px 14px; font-size: 0.8rem; }
}

/* ===== Success Page ===== */
.success {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}
.success__inner {
  max-width: 440px;
  width: 100%;
  text-align: center;
}
.success__check {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2.5px solid #d4a843;
  background: rgba(212, 168, 67, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 36px;
}
.success__check svg {
  width: 28px;
  height: 28px;
  stroke: #d4a843;
}
.success__title {
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.success__title em {
  font-style: italic;
}
.success__subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 380px;
  margin-left: auto;
  margin-right: auto;
}
.success__download-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #d4a843;
  color: #0a0a0a;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  padding: 16px 36px;
  border-radius: 8px;
  text-decoration: none;
  transition: opacity 0.2s;
  cursor: pointer;
  border: none;
  margin-bottom: 48px;
}
.success__download-btn:hover {
  opacity: 0.85;
}
.success__download-btn:focus-visible {
  outline: 2px solid #d4a843;
  outline-offset: 3px;
}
.success__download-icon {
  width: 18px;
  height: 18px;
}
.success__contact {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.success__contact a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.success__contact a:hover {
  color: #d4a843;
}