/* Brevitas Systems — brand tokens
   Editorial-technical dark theme.
   Single source of truth for color, type, motion. */

:root {
  /* Dark mode colors (default) */
  --ink: #0f1410;
  --ink-2: #161b17;
  --ink-3: #1e231f;
  --line: #2a2f2a;
  --stone: #716b5e;
  --stone-2: #9a948a;
  --bone: #e8e2d5;
  --bone-dim: #c7c2b6;
  --bronze: #d4a84b;
  --bronze-deep: #a5802f;
  --oxblood: #8b2e2e;
  --signal: #a8c98b;
  --signal-glow: rgba(168, 201, 139, 0.12);

  --fg: var(--bone);
  --fg-dim: var(--bone-dim);
  --bg: var(--ink);

  /* Theme toggle icon colors */
  --toggle-bg: rgba(232, 226, 213, 0.1);
  --toggle-hover: rgba(232, 226, 213, 0.15);
  --toggle-icon: var(--bone-dim);

  /* Glassmorphic effects for dark mode */
  --glass-bg: linear-gradient(135deg, rgba(22, 27, 23, 0.9) 0%, rgba(15, 20, 16, 0.95) 100%);
  --glass-border: rgba(212, 169, 109, 0.15);
  --glass-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
  --input-bg: linear-gradient(135deg, rgba(22, 27, 23, 0.6) 0%, rgba(15, 20, 16, 0.8) 100%);
  --input-border: rgba(42, 47, 42, 0.8);
  --input-focus-bg: linear-gradient(135deg, rgba(212, 169, 109, 0.08) 0%, rgba(22, 27, 23, 0.9) 100%);
  --input-focus-border: #d4a96d;

  /* Navigation backgrounds */
  --nav-bg: rgba(15, 20, 16, 0.78);
  --nav-bg-scrolled: rgba(15, 20, 16, 0.92);

  /* Component backgrounds */
  --graphite: #100f0d;
  --component-bg-dark: rgba(16, 15, 13, 0.82);
  --component-bg-dark-light: rgba(16, 15, 13, 0.4);

  /* Success state gradient */
  --success-gradient: linear-gradient(135deg, rgba(168, 201, 139, 0.08) 0%, rgba(22, 27, 23, 0.95) 100%);
}

/* Light mode */
[data-theme="light"] {
  --ink: #fbfaf8;
  --ink-2: #f4f2ed;
  --ink-3: #ebe7e0;
  --line: #d4cfc4;
  --stone: #8b8578;
  --stone-2: #6b655a;
  --bone: #1a1815;
  --bone-dim: #3a3530;
  --bronze: #b88a20;
  --bronze-deep: #9a7319;
  --oxblood: #a03838;
  --signal: #5a7c3f;
  --signal-glow: rgba(90, 124, 63, 0.08);

  --fg: var(--bone);
  --fg-dim: var(--bone-dim);
  --bg: var(--ink);

  --toggle-bg: rgba(26, 24, 21, 0.08);
  --toggle-hover: rgba(26, 24, 21, 0.12);
  --toggle-icon: var(--bone-dim);

  /* Glassmorphic effects for light mode */
  --glass-bg: linear-gradient(135deg, rgba(251, 250, 248, 0.92) 0%, rgba(244, 242, 237, 0.95) 100%);
  --glass-border: rgba(184, 138, 32, 0.2);
  --glass-shadow: 0 16px 32px rgba(0, 0, 0, 0.08);
  --input-bg: linear-gradient(135deg, rgba(251, 250, 248, 0.8) 0%, rgba(244, 242, 237, 0.9) 100%);
  --input-border: rgba(212, 207, 196, 0.6);
  --input-focus-bg: linear-gradient(135deg, rgba(184, 138, 32, 0.05) 0%, rgba(251, 250, 248, 0.95) 100%);
  --input-focus-border: #b88a20;

  /* Navigation backgrounds for light mode */
  --nav-bg: rgba(251, 250, 248, 0.78);
  --nav-bg-scrolled: rgba(251, 250, 248, 0.92);

  /* Component backgrounds for light mode */
  --graphite: #f4f2ed;
  --component-bg-dark: rgba(244, 242, 237, 0.82);
  --component-bg-dark-light: rgba(244, 242, 237, 0.4);

  /* Success state gradient for light mode */
  --success-gradient: linear-gradient(135deg, rgba(90, 124, 63, 0.08) 0%, rgba(251, 250, 248, 0.95) 100%);
}

:root {
  /* Motion */
  --dur-xs: 120ms;
  --dur-sm: 240ms;
  --dur-md: 420ms;
  --dur-lg: 720ms;
  --dur-xl: 1200ms;

  --ease-out-standard: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out-data: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-step: steps(24);

  /* Layout */
  --max-w: 1280px;
  --narrow-w: 640px;
  --mid-w: 880px;
  --gutter: 72px;
  --gutter-m: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--ink);
  color: var(--fg);
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-feature-settings: "ss01", "cv11";
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color 300ms ease, color 300ms ease;
}

body { overflow-x: hidden; }

::selection { background: var(--bronze); color: var(--ink); }

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

/* Typography scale */
.t-display-xl {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 300;
  font-size: clamp(56px, 9vw, 120px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 36;
  text-wrap: balance;
}
.t-display {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 300;
  font-size: clamp(52px, 7vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 36;
  text-wrap: balance;
}
.t-h1 {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 400;
  font-size: clamp(40px, 5.5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  font-variation-settings: "opsz" 30;
  text-wrap: balance;
}
.t-h2 {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 400;
  font-size: clamp(32px, 3.8vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.012em;
  font-variation-settings: "opsz" 24;
  text-wrap: balance;
}
.t-h3 {
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-weight: 500;
  font-size: clamp(24px, 2.4vw, 32px);
  line-height: 1.18;
  letter-spacing: -0.01em;
}
.t-body-lg {
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-weight: 400;
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.55;
  color: var(--bone-dim);
}
.t-body {
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 1.62;
  color: var(--bone-dim);
}
.t-small {
  font-size: 14px;
  color: var(--stone-2);
}
.t-mono-lg {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 400;
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.5;
}
.t-mono {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 400;
  font-size: 13px;
  line-height: 1.5;
}
.t-overline {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone-2);
}

.serif { font-family: 'Newsreader', Georgia, serif; font-variation-settings: "opsz" 30; }
.mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }

.tabular { font-variant-numeric: tabular-nums; }

.signal { color: var(--signal); }
.bronze { color: var(--bronze); }
.oxblood { color: var(--oxblood); }
.stone-2 { color: var(--stone-2); }
.bone-dim { color: var(--bone-dim); }

/* Layout helpers */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 720px) {
  .container { padding: 0 20px; }
}

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

.section {
  padding: clamp(96px, 12vh, 200px) 0;
  position: relative;
}
.section--tight {
  padding: clamp(64px, 8vh, 120px) 0;
}

/* Grid */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 32px;
}
@media (max-width: 900px) {
  .grid-12 { grid-template-columns: 1fr; gap: 32px; }
}

/* Focus */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 3px;
  border-radius: 2px;
}
.btn-primary:focus-visible { outline-color: var(--bronze); }

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

/* Links with underline-on-hover */
.link {
  display: inline-block;
  position: relative;
  color: var(--fg);
}
.link::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-sm) var(--ease-out-standard);
}
.link:hover::after { transform: scaleX(1); }
.link:not(:hover)::after { transform-origin: right center; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.005em;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--dur-sm) var(--ease-out-standard), color var(--dur-sm) var(--ease-out-standard), border-color var(--dur-sm) var(--ease-out-standard);
  white-space: nowrap;
}
.btn .arrow {
  display: inline-block;
  transition: transform var(--dur-sm) var(--ease-out-standard);
}
.btn:hover .arrow { transform: translateX(4px); }

.btn-primary {
  background: var(--bronze);
  color: var(--ink);
  border-color: var(--bronze);
}
.btn-primary:hover {
  background: var(--bronze-deep);
  border-color: var(--bronze-deep);
  color: var(--ink);
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--fg);
}
.btn-secondary:hover {
  background: var(--fg);
  color: var(--ink);
}

.btn-ghost {
  background: transparent;
  color: var(--fg-dim);
  padding: 8px 0;
}
.btn-ghost:hover { color: var(--fg); }
.btn-ghost.underline { text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 4px; }
.btn-ghost.underline:hover { text-decoration-color: var(--fg); }

/* Inputs */
.input {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--fg);
  padding: 12px 16px;
  font-family: 'Inter Tight', system-ui, sans-serif;
  font-size: 15px;
  border-radius: 2px;
  width: 100%;
  transition: border-color var(--dur-xs) var(--ease-out-standard), background var(--dur-xs) var(--ease-out-standard);
}
.input::placeholder { color: var(--stone); }
.input:focus { border-color: var(--fg); background: rgba(255,255,255,0.01); }

/* Overline */
.overline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.overline-dot {
  width: 6px;
  height: 6px;
  background: var(--bronze);
  border-radius: 50%;
  display: inline-block;
}

/* Cards */
.card {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 28px;
  transition: border-color var(--dur-sm) var(--ease-out-standard);
}
.card:hover { border-color: var(--stone-2); }

/* Fade-up on scroll */
.fade-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-lg) var(--ease-out-soft), transform var(--dur-lg) var(--ease-out-soft);
}
.fade-up.in {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays */
.delay-1 { transition-delay: 60ms; }
.delay-2 { transition-delay: 120ms; }
.delay-3 { transition-delay: 180ms; }
.delay-4 { transition-delay: 240ms; }
.delay-5 { transition-delay: 320ms; }

/* Scrollbar subtle */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--ink); }
::-webkit-scrollbar-thumb { background: var(--ink-3); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--line); }

/* Noise overlay (very subtle) */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.025;
  z-index: 100;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* Logo mark */
.logo-mark {
  width: 28px;
  height: 28px;
  position: relative;
  display: inline-block;
  flex-shrink: 0;
}
.logo-mark::before, .logo-mark::after {
  content: '';
  position: absolute;
  background: currentColor;
}
.logo-mark::before {
  /* outer square as border */
  inset: 0;
  background: transparent;
  border: 1.5px solid currentColor;
}
.logo-mark-inner {
  position: absolute;
  inset: 0;
}
.logo-mark-inner::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 3px;
  bottom: 3px;
  width: 1.5px;
  background: currentColor;
  transform: translateX(-50%);
}
.logo-mark-inner::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 3px;
  right: 3px;
  height: 1.5px;
  background: currentColor;
  transform: translateY(-50%);
}

/* Inline waitlist row */
.waitlist-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
  max-width: 520px;
}
.waitlist-row .input { flex: 1; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: var(--nav-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-sm), background var(--dur-sm);
}
.nav.scrolled {
  border-bottom-color: var(--line);
  background: var(--nav-bg-scrolled);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
@media (max-width: 720px) { .nav-inner { padding: 14px 20px; } }
.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}
.nav-link {
  font-size: 14px;
  color: var(--stone-2);
  transition: color var(--dur-xs);
  position: relative;
}
.nav-link:hover, .nav-link.active { color: var(--fg); }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1px;
  background: var(--bronze);
}

@media (max-width: 820px) {
  .nav-links.desktop { display: none; }
}
.nav-hamburger {
  display: none;
  background: transparent;
  border: 0;
  color: var(--fg);
  cursor: pointer;
  padding: 8px;
}
@media (max-width: 820px) {
  .nav-hamburger { display: inline-flex; flex-direction: column; gap: 5px; }
  .nav-hamburger span { display: block; width: 20px; height: 1.5px; background: currentColor; }
  .nav .btn-primary.nav-cta { display: none; }
}

/* Mobile sheet */
.nav-sheet {
  position: fixed;
  inset: 0;
  background: var(--ink);
  z-index: 200;
  padding: 24px 20px;
  display: none;
  flex-direction: column;
  gap: 24px;
}
.nav-sheet.open { display: flex; }
.nav-sheet-links {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 32px;
}
.nav-sheet-links a {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 300;
  font-size: 44px;
  line-height: 1.1;
  color: var(--fg);
}
.nav-sheet-links a:hover { color: var(--bronze); }
.nav-sheet-close {
  align-self: flex-end;
  background: transparent;
  border: 0;
  color: var(--fg);
  font-size: 28px;
  cursor: pointer;
}

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  padding: 72px 0 32px;
  margin-top: 64px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
}
@media (max-width: 820px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer h4 {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone);
  font-weight: 500;
  margin: 0 0 20px 0;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.footer li a { color: var(--fg-dim); font-size: 14px; transition: color var(--dur-xs); }
.footer li a:hover { color: var(--fg); }

.footer-bottom {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  color: var(--stone);
}
.footer-bottom .legal {
  display: flex;
  gap: 20px;
}
.footer-bottom .legal a:hover { color: var(--fg); }

.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.status-dot::before {
  content: '';
  width: 7px; height: 7px;
  background: var(--signal);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--signal-glow);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}