:root {
  --bg: #050506;
  --fg: #ffffff;
  --dim: #8e8e96;
  --faint: #44444a;
  --card-bg: #070709;
  --line: #1c1c20;
  --line-strong: #2c2c34;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

.mono {
  font-family: var(--mono);
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

/* Nav */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 5, 6, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

nav .wrap {
  display: flex;
  align-items: center;
  height: 68px;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 3.5px;
  height: 18px;
}

.brand-mark i {
  display: block;
  width: 2.5px;
  background: #ffffff;
  border-radius: 1px;
}

.brand-mark i:nth-child(1) { height: 18px; }
.brand-mark i:nth-child(2) { height: 11px; }
.brand-mark i:nth-child(3) { height: 18px; }
.brand-mark i:nth-child(4) { height: 11px; }

.brand-mark.dark i {
  background: #000000;
}

.navlinks {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 24px;
}

.navlink {
  color: var(--dim);
  font-size: 14px;
  transition: color 0.15s;
}

.navlink:hover, .navlink.active {
  color: var(--fg);
}

.navlinks .dot {
  color: var(--faint);
  font-size: 11px;
}

/* Mobile menu — button toggles body.menu-open */
.hamb {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 4px;
}
.hbars {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}
.hbars i {
  height: 2px;
  background: #ffffff;
  display: block;
  border-radius: 1px;
}
.hamb-links {
  position: fixed;
  right: 16px;
  top: 76px;
  background: #0a0a0c;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  padding: 6px;
  min-width: 170px;
  z-index: 300;
  display: none;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
}
body.menu-open .hamb-links {
  display: block;
}
.hamb-links a {
  display: block;
  padding: 13px 18px;
  color: var(--dim);
  font-size: 14.5px;
  border-radius: 9px;
}
.hamb-links a:hover, .hamb-links a:active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
}

.btn-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  color: #000000;
  font-weight: 600;
  font-size: 13.5px;
  padding: 9px 20px;
  border-radius: 999px;
  border: 1px solid #ffffff;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s, opacity 0.15s;
}

.btn-pill:hover {
  background: #e5e5ea;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--fg);
  font-size: 13.5px;
  padding: 9px 22px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  transition: border-color 0.15s, background 0.15s;
}

.btn-ghost:hover {
  border-color: #555560;
  background: rgba(255, 255, 255, 0.03);
}

/* Page titles (Models, Privacy, Support) */
.page-header {
  text-align: center;
  padding: 72px 0 44px;
}

.page-title {
  font-size: clamp(40px, 5.5vw, 64px);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.page-sub {
  color: var(--dim);
  font-size: 17px;
  letter-spacing: -0.01em;
}

/* Chips row */
.chips-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--dim);
  background: transparent;
  cursor: pointer;
  transition: all 0.15s;
}

.chip:hover {
  border-color: var(--line-strong);
  color: var(--fg);
}

.chip.active {
  border-color: #ffffff;
  color: #ffffff;
}

.chip-dot {
  color: var(--faint);
  font-size: 10px;
}

/* Cards & Lists */
.section-label {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--dim);
  margin: 44px 0 16px;
  letter-spacing: 0.01em;
}

.card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.model-card {
  display: flex;
  align-items: center;
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card-bg);
  transition: border-color 0.15s;
}

.model-card:hover {
  border-color: var(--line-strong);
}

.model-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 18px;
  flex-shrink: 0;
  color: #ffffff;
}

.model-info {
  flex: 1;
  min-width: 0;
}

.model-name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 2px;
}

.model-desc {
  font-size: 12.5px;
  color: var(--dim);
  font-family: var(--mono);
}

.model-meta {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--dim);
  text-align: right;
  margin-left: 20px;
  white-space: nowrap;
}

/* Three-column grid (Privacy) */
.col-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.feature-box {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card-bg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
}

.feature-icon-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: #ffffff;
}

.feature-title {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--dim);
  font-size: 13.5px;
  font-family: var(--mono);
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-list li::after {
  content: "";
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--faint);
  margin-left: 4px;
}

/* Banner / wide card */
.wide-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card-bg);
  padding: 32px 28px;
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 22px;
}

.wide-card .icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.wide-card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 4px;
}

.wide-card-desc {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--dim);
}

/* Support tip box */
.support-center {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.tip-box {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card-bg);
  padding: 36px 32px;
}

.tip-options {
  display: flex;
  gap: 14px;
  align-items: center;
}

.tip-btn {
  flex: 1;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 14px;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: all 0.15s;
  color: #ffffff;
}

.tip-btn:hover {
  border-color: #ffffff;
}

.tip-val {
  font-size: 20px;
  font-weight: 600;
  font-family: var(--mono);
}

.tip-unit {
  font-size: 11px;
  color: var(--dim);
  font-family: var(--mono);
  margin-top: 2px;
}

.tip-monthly {
  flex: 2;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 14px;
  cursor: pointer;
  color: #ffffff;
  background: transparent;
  transition: all 0.15s;
}

.tip-monthly:hover {
  border-color: #ffffff;
}

.tip-single {
  flex: 1;
}

.tip-note {
  margin-top: 22px;
  text-align: center;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--faint);
}

.tip-note a {
  color: var(--dim);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.tip-note a:hover {
  color: var(--fg);
}

/* Monospace note */
.mono-note {
  text-align: center;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--faint);
  margin: 48px 0;
  line-height: 1.8;
}

/* Footer */
footer {
  border-top: 1px solid var(--line);
  margin-top: 80px;
}

footer .wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  height: 90px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
}

footer .dot {
  color: var(--faint);
}
footer .flinks {
  margin-left: auto;
  display: flex;
  gap: 16px;
}
footer .flinks a {
  color: var(--dim);
}
footer .flinks a:hover {
  color: var(--fg);
}

@media (max-width: 768px) {
  .col-grid-3 {
    grid-template-columns: 1fr;
  }
  .tip-options {
    flex-direction: column;
  }
  .navlinks .navlink {
    display: none;
  }
  .navlinks .dot {
    display: none;
  }
  .hamb {
    display: block;
  }
  .btn-pill {
    padding: 8px 14px;
    font-size: 12.5px;
  }
  .navlinks {
    gap: 14px;
  }
  footer .wrap {
    height: auto;
    padding: 22px 0;
    flex-wrap: wrap;
  }
  footer .flinks {
    margin-left: 0;
    width: 100%;
    justify-content: center;
  }
}