/* =========================================================================
   Trelven LLC — Design system
   Dark theme. Indigo accent. DM Sans + Instrument Serif + JetBrains Mono.
   ========================================================================= */

/* ---------- Tokens ---------- */
:root {
  --bg: #06060a;
  --bg-elev: #0c0c14;
  --bg-card: #0f0f18;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #e6e6f0;
  --text-muted: #9a9aae;
  --text-dim: #6b6b80;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.35);
  --success: #34d399;
  --danger: #f87171;

  --font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  --max-w: 1200px;
  --gutter: clamp(20px, 4vw, 40px);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 160ms var(--ease);
}
a:hover { color: var(--accent-hover); }

button {
  font: inherit;
  cursor: pointer;
  border: 0;
  background: none;
  color: inherit;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* ---------- Ambient backdrop ---------- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(900px 600px at 15% -10%, rgba(99, 102, 241, 0.15), transparent 60%),
    radial-gradient(700px 500px at 100% 10%, rgba(99, 102, 241, 0.08), transparent 60%),
    radial-gradient(800px 500px at 50% 100%, rgba(99, 102, 241, 0.06), transparent 60%);
}

/* ---------- Layout helpers ---------- */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section { padding-block: clamp(80px, 12vw, 140px); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 0 20px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--border-strong);
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}
.section-title em {
  font-style: italic;
  color: var(--accent);
}

.section-lead {
  font-size: clamp(17px, 1.6vw, 19px);
  color: var(--text-muted);
  max-width: 64ch;
  margin: 0 0 56px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: rgba(6, 6, 10, 0.65);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--border);
  background: rgba(6, 6, 10, 0.85);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  letter-spacing: -0.01em;
  font-size: 17px;
  color: var(--text);
}
.brand:hover { color: var(--text); }
.brand-mark {
  width: 32px;
  height: 32px;
  color: var(--text);
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 32px;
  align-items: center;
}
.nav-links a {
  font-size: 14.5px;
  color: var(--text-muted);
}
.nav-links a:hover { color: var(--text); }
.nav-links .nav-cta {
  padding: 9px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text);
  transition: all 180ms var(--ease);
}
.nav-links .nav-cta:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  position: relative;
  transition: transform 220ms var(--ease), opacity 180ms var(--ease);
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  transition: transform 220ms var(--ease);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after  { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after  { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: transform 180ms var(--ease), background 180ms var(--ease),
              border-color 180ms var(--ease), color 180ms var(--ease),
              box-shadow 220ms var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 30px -10px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 14px 40px -10px var(--accent-glow);
}
.btn-ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: var(--text);
  color: var(--text);
  transform: translateY(-1px);
}
.btn .arrow { transition: transform 220ms var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- Hero ---------- */
.hero {
  padding-block: clamp(100px, 14vw, 180px) clamp(80px, 12vw, 140px);
  position: relative;
}

.hero-inner {
  display: grid;
  gap: 32px;
  max-width: 880px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.18);
  color: var(--success);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  width: max-content;
}
.badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: pulse 2s var(--ease) infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
  50%      { box-shadow: 0 0 0 8px rgba(52, 211, 153, 0); }
}

.hero h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(48px, 9vw, 104px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  margin: 0;
}
.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero-sub {
  font-size: clamp(17px, 1.7vw, 20px);
  color: var(--text-muted);
  max-width: 60ch;
  margin: 0;
}

.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ---------- Cards / Grids ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.card {
  position: relative;
  padding: 32px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease),
              background 220ms var(--ease);
  overflow: hidden;
}
.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.4), transparent 40%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity 260ms var(--ease);
  pointer-events: none;
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent);
  margin-bottom: 22px;
}
.card h3 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}
.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
}

/* ---------- About section ---------- */
.about .section-title { max-width: 16ch; }

/* ---------- Apps section ---------- */
.app-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 36px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg-card), rgba(15, 15, 24, 0.4));
  border: 1px solid var(--border);
  min-height: 280px;
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}
.app-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
}
.app-status {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.app-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.app-card h3 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3vw, 36px);
  line-height: 1.1;
  font-weight: 400;
  margin: 0;
  letter-spacing: -0.015em;
}
.app-card p {
  margin: 0;
  color: var(--text-muted);
  max-width: 50ch;
}

/* ---------- Values ---------- */
.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}
.value {
  padding: 36px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.value-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}
.value h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  font-size: clamp(26px, 3vw, 32px);
  line-height: 1.15;
  margin: 0;
  letter-spacing: -0.01em;
}
.value p {
  margin: 0;
  color: var(--text-muted);
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}
.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 32px);
  color: var(--text);
  margin-top: 8px;
}
.contact-email:hover { color: var(--accent-hover); }

form.contact-form {
  display: grid;
  gap: 18px;
  padding: 36px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}
.field { display: grid; gap: 8px; }
.field label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.field input,
.field textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font: inherit;
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: #0d0d18;
}
.field textarea {
  min-height: 130px;
  resize: vertical;
}
.form-note {
  font-size: 13px;
  color: var(--text-dim);
  margin: 0;
}
.form-status {
  font-size: 13px;
  color: var(--success);
  min-height: 1em;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 64px 32px;
  margin-top: 60px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 14.5px;
  max-width: 32ch;
  margin: 12px 0 0;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 0 16px;
  font-weight: 500;
}
.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.footer-col a {
  color: var(--text-muted);
  font-size: 14.5px;
}
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-dim);
}

/* ---------- Legal / standalone pages ---------- */
.legal {
  padding-block: clamp(60px, 10vw, 120px);
}
.legal-inner {
  max-width: 760px;
  margin-inline: auto;
}
.legal h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}
.legal .updated {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 48px;
  display: block;
}
.legal h2 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(24px, 2.6vw, 30px);
  letter-spacing: -0.01em;
  margin: 48px 0 14px;
}
.legal h3 {
  font-size: 17px;
  font-weight: 500;
  margin: 28px 0 10px;
}
.legal p,
.legal li {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.75;
}
.legal a {
  color: var(--accent-hover);
  text-decoration: underline;
  text-decoration-color: rgba(99, 102, 241, 0.4);
  text-underline-offset: 3px;
}
.legal ul,
.legal ol {
  padding-left: 22px;
}
.legal ul li,
.legal ol li {
  margin-bottom: 8px;
}

/* ---------- FAQ ---------- */
.faq {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 22px 26px;
  transition: border-color 200ms var(--ease);
}
.faq details[open] { border-color: var(--border-strong); }
.faq summary {
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.005em;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  color: var(--text);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--text-dim);
  transition: transform 220ms var(--ease);
}
.faq details[open] summary::after { content: "−"; }
.faq details > p,
.faq details > ul {
  margin: 14px 0 0;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .badge .dot { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed;
    inset: 64px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 24px;
    background: rgba(6, 6, 10, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform 240ms var(--ease), opacity 200ms var(--ease);
  }
  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links li {
    border-top: 1px solid var(--border);
  }
  .nav-links a {
    display: block;
    padding: 16px 4px;
    font-size: 16px;
    color: var(--text);
  }
  .nav-links .nav-cta {
    margin-top: 14px;
    text-align: center;
    border-radius: 999px;
    padding: 12px 16px;
  }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .hero-ctas { width: 100%; }
  .btn { width: 100%; justify-content: center; }
  .card, .app-card, form.contact-form { padding: 26px; }
  .value { padding: 28px 24px; }
}

/* Lock scroll while mobile nav is open */
body.nav-open { overflow: hidden; }