/* ==========================================================================
   site-10 — Premium tối giản / Luxury dark
   ========================================================================== */

:root {
  --bg: #0a0a0a;
  --bg-alt: #121212;
  --ink: #f2efe9;
  --ink-muted: #b8b3a8;
  --ink-faint: #857f72;
  --gold: #c9a876;
  --gold-soft: rgba(201, 168, 118, 0.35);
  --gold-faint: rgba(201, 168, 118, 0.14);
  --divider: rgba(201, 168, 118, 0.2);
  --serif: "Fraunces", "Playfair Display", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ease-slow: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}

.wrap-narrow {
  max-width: 720px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 34px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.5s var(--ease-slow), color 0.5s var(--ease-slow),
    border-color 0.5s var(--ease-slow), transform 0.5s var(--ease-slow);
}

.btn-solid {
  background: var(--gold);
  color: #14120d;
  border: 1px solid var(--gold);
}

.btn-solid:hover,
.btn-solid:focus-visible {
  background: transparent;
  color: var(--gold);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--divider);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-muted);
  border: 1px solid transparent;
  padding: 16px 8px;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--gold);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 11px;
}

.btn-wide {
  width: 100%;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(10, 10, 10, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--divider);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand-mark {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.site-nav {
  display: flex;
  gap: 36px;
}

.site-nav a {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-muted);
  transition: color 0.5s var(--ease-slow);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--gold);
}

/* ---------- Hero ---------- */

.hero {
  padding: 120px 0 100px;
  border-bottom: 1px solid var(--divider);
}

.hero-inner {
  text-align: center;
}

.eyebrow {
  margin: 0 0 28px;
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--gold);
}

.hero-title {
  margin: 0 0 24px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.6rem, 6vw, 5rem);
  letter-spacing: 0.02em;
  line-height: 1.08;
  color: var(--ink);
}

.hero-tagline {
  max-width: 620px;
  margin: 0 auto 48px;
  font-size: 17px;
  font-weight: 300;
  color: var(--ink-muted);
  line-height: 1.75;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 96px;
}

/* ---------- Hero mockup (pure CSS) ---------- */

.hero-mock {
  max-width: 640px;
  margin: 0 auto;
}

.mock-frame {
  border: 1px solid var(--gold-soft);
  border-radius: 4px;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  overflow: hidden;
  text-align: left;
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--divider);
}

.mock-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--gold-soft);
}

.mock-url {
  margin-left: 12px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.mock-body {
  padding: 28px 24px 32px;
}

.mock-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.mock-label {
  flex: 0 0 130px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.mock-bar-track {
  flex: 1;
  height: 2px;
  background: var(--divider);
  position: relative;
  overflow: hidden;
}

.mock-bar-fill {
  position: absolute;
  inset: 0;
  width: 82%;
  background: var(--gold);
}

.mock-fill-2 {
  width: 58%;
}

.mock-fill-3 {
  width: 94%;
}

.mock-stats {
  display: flex;
  gap: 40px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--divider);
}

.mock-num {
  display: block;
  font-family: var(--serif);
  font-size: 26px;
  color: var(--gold);
}

.mock-num-label {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

/* ---------- Sections ---------- */

.section {
  padding: 110px 0;
  border-bottom: 1px solid var(--divider);
}

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

.section-eyebrow {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--gold);
  text-align: center;
}

.section-title {
  margin: 0 0 72px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.9rem, 3.6vw, 2.8rem);
  letter-spacing: 0.015em;
  line-height: 1.28;
  text-align: center;
  color: var(--ink);
}

/* ---------- Feature list ---------- */

.feature-list {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 880px;
}

.feature-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  align-items: baseline;
  padding: 28px 0;
  border-top: 1px solid var(--divider);
  transition: padding-left 0.5s var(--ease-slow);
}

.feature-list li:last-child {
  border-bottom: 1px solid var(--divider);
}

.feature-item:hover {
  padding-left: 10px;
}

.feature-icon {
  font-size: 20px;
  color: var(--gold);
  opacity: 0.9;
}

.feature-title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.feature-desc {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink-muted);
  line-height: 1.7;
  max-width: 640px;
}

/* ---------- Process ---------- */

.process-list {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 760px;
  display: grid;
  gap: 0;
}

.process-step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 28px;
  padding: 30px 0;
  border-top: 1px solid var(--divider);
}

.process-list li:last-child {
  border-bottom: 1px solid var(--divider);
}

.process-num {
  font-family: var(--serif);
  font-size: 26px;
  color: var(--gold);
}

.process-step h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.process-step p {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink-muted);
  line-height: 1.7;
}

/* ---------- Use cases ---------- */

.usecase-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--divider);
  border: 1px solid var(--divider);
}

.usecase-item {
  background: var(--bg);
  padding: 36px 28px;
  transition: background 0.5s var(--ease-slow);
}

.usecase-item:hover {
  background: var(--bg-alt);
}

.usecase-title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 16.5px;
  letter-spacing: 0.01em;
  color: var(--gold);
}

.usecase-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.7;
}

/* ---------- Pricing ---------- */

.pricing-card {
  text-align: center;
  padding: 72px 48px;
  border: 1px solid var(--gold-soft);
  position: relative;
}

.pricing-card::before,
.pricing-card::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1px solid var(--gold);
  opacity: 0.7;
}

.pricing-card::before {
  top: -1px;
  left: -1px;
  border-right: none;
  border-bottom: none;
}

.pricing-card::after {
  bottom: -1px;
  right: -1px;
  border-left: none;
  border-top: none;
}

.pricing-limited {
  margin: 0 0 24px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.pricing-product {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 30px;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.pricing-price {
  margin: 0 0 32px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
  color: var(--gold);
}

.pricing-includes {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: inline-flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.pricing-includes li {
  font-size: 14px;
  color: var(--ink-muted);
  padding-left: 20px;
  position: relative;
}

.pricing-includes li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--gold);
}

/* ---------- FAQ ---------- */

.faq-list {
  border-top: 1px solid var(--divider);
}

.faq-item {
  border-bottom: 1px solid var(--divider);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 4px;
  background: transparent;
  border: none;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.01em;
  text-align: left;
  cursor: pointer;
}

.faq-question:hover,
.faq-question:focus-visible {
  color: var(--gold);
}

.faq-icon {
  flex-shrink: 0;
  font-family: var(--serif);
  font-size: 20px;
  color: var(--gold);
  transition: transform 0.5s var(--ease-slow);
}

.faq-item[data-open="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--ease-slow);
}

.faq-answer p {
  margin: 0;
  padding: 0 4px 26px;
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.75;
  max-width: 640px;
}

/* ---------- Final CTA ---------- */

.cta-final {
  text-align: center;
  padding: 130px 0;
}

.cta-final-title {
  margin: 0 auto 44px;
  max-width: 620px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  letter-spacing: 0.015em;
  line-height: 1.4;
  color: var(--ink);
}

.cta-final-contact {
  margin: 40px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.cta-final-contact a {
  text-decoration: none;
  color: var(--ink-muted);
  transition: color 0.5s var(--ease-slow);
}

.cta-final-contact a:hover,
.cta-final-contact a:focus-visible {
  color: var(--gold);
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 56px 0 64px;
  background: var(--bg-alt);
}

.disclaimer {
  margin: 0 0 24px;
  font-size: 12px;
  color: var(--ink-muted);
  line-height: 1.8;
}

.footer-copy {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

/* ---------- Buy modal override (luxury dark tone) ---------- */

.buy-modal-overlay {
  --buy-modal-accent: #c9a876;
  --buy-modal-accent-text: #14120d;
  --buy-modal-bg: #121212;
  --buy-modal-text: #f2efe9;
  --buy-modal-muted: #b8b3a8;
  --buy-modal-border: rgba(201, 168, 118, 0.25);
  --buy-modal-radius: 4px;
  --buy-modal-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  .wrap {
    padding: 0 20px;
  }

  .site-nav {
    display: none;
  }

  .hero {
    padding: 88px 0 72px;
  }

  .hero-title {
    letter-spacing: 0.005em;
  }

  .section {
    padding: 76px 0;
  }

  .section-title {
    margin-bottom: 48px;
    letter-spacing: 0.005em;
  }

  .feature-item {
    grid-template-columns: 40px 1fr;
    gap: 16px;
  }

  .process-step {
    grid-template-columns: 44px 1fr;
    gap: 18px;
  }

  .pricing-card {
    padding: 48px 24px;
  }

  .cta-final {
    padding: 88px 0;
  }

  .btn {
    letter-spacing: 0.1em;
    padding: 15px 26px;
  }
}