/* ============================================================
   Karosa Holdings — Investor-grade design system
   ============================================================ */

:root {
  --font-display: "Instrument Serif", Georgia, "Times New Roman", serif;
  --font-brand: "Fraunces", "Instrument Serif", Georgia, serif;
  --font-body: "Manrope", ui-sans-serif, system-ui, sans-serif;

  --step--1: clamp(0.75rem, 0.72rem + 0.15vw, 0.85rem);
  --step-0:  clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --step-1:  clamp(1.1rem, 1rem + 0.45vw, 1.35rem);
  --step-2:  clamp(1.4rem, 1.2rem + 0.9vw, 1.9rem);
  --step-3:  clamp(2rem, 1.55rem + 2.1vw, 3.4rem);
  --step-4:  clamp(2.8rem, 2rem + 3.8vw, 5.4rem);
  --step-brand: clamp(2.4rem, 1.7rem + 3.2vw, 4.6rem);

  --space-xs: clamp(0.4rem, 0.35rem + 0.3vw, 0.6rem);
  --space-s:  clamp(0.75rem, 0.6rem + 0.6vw, 1.1rem);
  --space-m:  clamp(1.25rem, 1rem + 1.2vw, 2rem);
  --space-l:  clamp(2.25rem, 1.7rem + 2.5vw, 4rem);
  --space-xl: clamp(4rem, 2.8rem + 5vw, 8.5rem);

  --measure: 62ch;
  --shell: 1120px;
  --radius: 2px;

  /* Ink + champagne — prestige holding company, not startup purple */
  --bg: #0a0b0d;
  --bg-elev: #12141a;
  --bg-soft: #181b22;
  --text: #f4f1ea;
  --text-soft: #9a958a;
  --line: rgba(244, 241, 234, 0.1);
  --accent: #c9a46a;
  --accent-bright: #e2c48a;
  --accent-ink: #0a0b0d;
  --ok: #6fbf9a;
  --ring: #c9a46a;
  --glow: rgba(201, 164, 106, 0.18);
  --glow-blue: rgba(59, 108, 255, 0.14);
  --blue: #3b6cff;
  --blue-soft: #6b8fff;
  --violet: #8b6cff;
  --silver: #c5cad3;
  --silver-soft: #9aa3b0;

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

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3efe6;
    --bg-elev: #fffcf7;
    --bg-soft: #ebe5d8;
    --text: #14151a;
    --text-soft: #5f5a52;
    --line: rgba(20, 21, 26, 0.12);
    --accent: #8a6430;
    --accent-bright: #a8793a;
    --accent-ink: #fffcf7;
    --ok: #2d7a58;
    --ring: #8a6430;
    --glow: rgba(138, 100, 48, 0.14);
    --glow-blue: rgba(45, 80, 200, 0.1);
    --blue: #2f56d4;
    --blue-soft: #4d73e8;
    --violet: #6d4fd4;
    --silver: #5a6170;
    --silver-soft: #7a8290;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 80% -10%, var(--glow), transparent 55%),
    radial-gradient(900px 500px at -5% 25%, var(--glow-blue), transparent 50%),
    radial-gradient(700px 420px at 60% 90%, rgba(139, 108, 255, 0.08), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--step-4); margin: 0 0 var(--space-m); }
h2 { font-size: var(--step-3); margin: 0 0 var(--space-s); max-width: 18ch; }
h3 { font-size: var(--step-2); margin: 0 0 var(--space-xs); }

p { margin: 0 0 var(--space-s); max-width: var(--measure); }
.lead { font-size: var(--step-1); color: var(--text-soft); line-height: 1.55; }

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: color-mix(in srgb, var(--accent) 50%, transparent);
}
a:hover { text-decoration-color: var(--accent); color: var(--accent-bright); }

:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
  padding: 0.9rem clamp(1rem, 3vw, 2rem);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text);
}
.brand:hover { color: var(--text); }
.brand-mark {
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 0.35rem;
  object-fit: cover;
  flex-shrink: 0;
}
.brand-text {
  font-family: var(--font-brand);
  font-size: clamp(1.15rem, 1.05rem + 0.35vw, 1.35rem);
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--silver);
}
.brand-signal {
  position: relative;
  z-index: 2;
  margin: 0 0 var(--space-l);
  max-width: none;
  overflow: visible;
}
.brand-signal-line {
  display: inline-block;
  font-family: var(--font-brand);
  font-size: var(--step-brand);
  font-weight: 600;
  font-optical-sizing: auto;
  line-height: 1.3;
  letter-spacing: -0.025em;
  padding: 0.08em 0.02em 0.28em;
  color: var(--silver);
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.5vw, 1.75rem);
}
.site-header nav a {
  text-decoration: none;
  color: var(--text-soft);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.site-header nav a:hover { color: var(--text); }
.nav-cta {
  color: var(--accent-ink) !important;
  background: var(--accent);
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
}
.nav-cta:hover { filter: brightness(1.08); color: var(--accent-ink) !important; }

@media (max-width: 700px) {
  .site-header nav a:not(.nav-cta) { display: none; }
}

/* ---------- Sections ---------- */
main > section {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: var(--space-xl) clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}

.section-head { margin-bottom: var(--space-l); }
.section-label {
  margin: 0 0 var(--space-xs);
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.section-intro {
  color: var(--text-soft);
  max-width: 48ch;
  margin-top: var(--space-s);
}

/* ---------- Buttons ---------- */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: var(--space-m) 0;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.45rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  font-size: var(--step-0);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s var(--ease), background 0.2s ease, border-color 0.2s ease;
}
.button:active { transform: translateY(1px); }
.button.primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.button.primary:hover { background: var(--accent-bright); color: var(--accent-ink); }
.button.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}
.button.ghost:hover { border-color: var(--accent); color: var(--accent-bright); }

/* ---------- Hero ---------- */
.hero {
  min-height: min(100vh, 920px);
  display: grid;
  align-content: center;
  padding-top: calc(var(--space-xl) + 2rem);
  padding-bottom: var(--space-xl);
  overflow: visible;
}

.hero-veil {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 35%, transparent) 0%, transparent 28%, transparent 70%, var(--bg) 100%),
    radial-gradient(ellipse 60% 50% at 70% 35%, transparent 0%, color-mix(in srgb, var(--bg) 40%, transparent) 100%);
  pointer-events: none;
}
.hero-field {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.9;
}

.hero h1 {
  position: relative;
  z-index: 1;
  max-width: 16ch;
  font-size: var(--step-3);
  color: var(--text-soft);
}
.hero h1 em {
  font-style: italic;
  color: var(--text);
}

.hero .lede {
  position: relative;
  z-index: 1;
  font-size: var(--step-1);
  color: var(--text-soft);
  max-width: 46ch;
}

.hero .cta-row {
  position: relative;
  z-index: 1;
}

/* ---------- About ---------- */
.about-layout {
  display: grid;
  gap: var(--space-l);
  grid-template-columns: 1.4fr 0.9fr;
  align-items: start;
}
@media (max-width: 800px) {
  .about-layout { grid-template-columns: 1fr; }
}

.about-copy .lead { margin-bottom: var(--space-m); }

.milestones {
  padding: var(--space-m);
  background: var(--bg-elev);
  border: 1px solid var(--line);
}
.milestones ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-m);
}
.milestones li {
  display: grid;
  gap: 0.25rem;
  padding-bottom: var(--space-m);
  border-bottom: 1px solid var(--line);
}
.milestones li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.milestone-label {
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent);
}

/* ---------- Portfolio + hologram ---------- */
.holo-stage {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-l);
  align-items: stretch;
  min-height: 480px;
}
@media (max-width: 900px) {
  .holo-stage { grid-template-columns: 1fr; min-height: 0; }
}

.holo-viewport {
  position: relative;
  margin: 0;
  min-height: 520px;
  background:
    radial-gradient(circle at 50% 42%, var(--glow), transparent 52%),
    radial-gradient(circle at 50% 100%, rgba(90, 110, 140, 0.12), transparent 45%),
    linear-gradient(180deg, #10131a, #0c0e13 60%, #0a0b0d);
  border: 1px solid var(--line);
  overflow: hidden;
  touch-action: none;
  cursor: grab;
  isolation: isolate;
}
.holo-viewport::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    transparent 0,
    transparent 3px,
    rgba(244, 241, 234, 0.015) 3px,
    rgba(244, 241, 234, 0.015) 4px
  );
  pointer-events: none;
  z-index: 1;
  mix-blend-mode: soft-light;
}
.holo-viewport:active { cursor: grabbing; }

#holo-canvas {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  min-height: 520px;
}

.holo-hint {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  display: flex;
  gap: 0.5rem;
  margin: 0;
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
  pointer-events: none;
}

.holo-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  padding: var(--space-l) var(--space-m);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  min-height: 100%;
}
.holo-panel .product-value {
  margin: 0 0 var(--space-xs);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent);
}
.product-title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: var(--space-s);
}
.product-title-row h3 {
  margin: 0;
  font-size: var(--step-3);
}
.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
}
.tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--line);
  color: var(--text-soft);
}
.tag.status[data-status="beta"] {
  color: var(--blue-soft);
  border-color: color-mix(in srgb, var(--blue) 50%, var(--line));
}
.tag.status[data-status="development"] {
  color: var(--violet);
  border-color: color-mix(in srgb, var(--violet) 50%, var(--line));
}
.product-outcome {
  margin-top: auto;
  padding-top: var(--space-m);
  border-top: 1px solid var(--line);
  color: var(--text-soft);
  font-size: var(--step--1);
}

.product-switcher {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.4rem;
  margin-top: var(--space-m);
}
.product-switcher button {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.65rem 0.3rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.product-switcher button:hover {
  border-color: var(--accent);
  color: var(--text);
}
.product-switcher button.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.product-fallback {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Operating model ---------- */
.edge-list {
  list-style: none;
  margin: 0 0 var(--space-l);
  padding: 0;
  display: grid;
  gap: 0;
}
.edge-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: var(--space-m);
  padding: var(--space-m) 0;
  border-top: 1px solid var(--line);
}
.edge-list li:last-child { border-bottom: 1px solid var(--line); }
.edge-index {
  font-family: var(--font-display);
  font-size: var(--step-2);
  color: var(--accent);
  line-height: 1;
}
.edge-list p { margin: 0; color: var(--text-soft); }

/* ---------- Investors ---------- */
.partner-points {
  margin: var(--space-m) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}
.partner-points li {
  padding: var(--space-m) 0;
  border-top: 1px solid var(--line);
  max-width: var(--measure);
}
.partner-points li:last-child { border-bottom: 1px solid var(--line); }

/* ---------- Contact ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--space-l);
  align-items: start;
}
@media (max-width: 800px) {
  .contact-layout { grid-template-columns: 1fr; }
}

.availability {
  padding: var(--space-m);
  background: var(--bg-elev);
  border: 1px solid var(--line);
}
.availability p { margin: 0 0 0.5rem; }
.availability-status { display: flex; align-items: center; gap: 0.55rem; }
.dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--blue-soft);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--blue) 28%, transparent);
  flex-shrink: 0;
}
.contact-direct { color: var(--text-soft); font-size: var(--step--1); }

.contact form {
  display: grid;
  gap: var(--space-s);
}
.form-row { display: grid; gap: 0.4rem; }
.form-row label {
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.optional { color: var(--text-soft); font-weight: 400; text-transform: none; letter-spacing: 0; }

input, select, textarea {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.8rem 0.9rem;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
textarea { resize: vertical; min-height: 7rem; }
.hidden-field { position: absolute; left: -9999px; }
.contact form .button { justify-self: start; margin-top: 0.25rem; }

/* ---------- Form success toast ---------- */
body.toast-open { overflow: hidden; }

.form-toast {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  backdrop-filter: blur(10px) saturate(120%);
}

.form-toast[hidden] { display: none; }

.form-toast-card {
  width: min(26rem, 100%);
  padding: var(--space-l) var(--space-m);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  text-align: left;
}

.form-toast-kicker {
  margin: 0 0 var(--space-xs);
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.form-toast-card h2 {
  margin: 0 0 var(--space-s);
  max-width: none;
  font-size: var(--step-2);
}

.form-toast-card p {
  margin: 0 0 var(--space-m);
  color: var(--text-soft);
}

.form-toast-card .button {
  width: 100%;
}

/* ---------- Footer ---------- */
.site-footer {
  max-width: var(--shell);
  margin-inline: auto;
  padding: var(--space-l) clamp(1rem, 3vw, 2rem) var(--space-xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.7fr 1fr;
  gap: var(--space-m);
  padding-bottom: var(--space-m);
  border-bottom: 1px solid var(--line);
}
@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
.footer-logo {
  display: inline-block;
  margin: 0 0 0.75rem;
  text-decoration: none;
}
.footer-logo img {
  display: block;
  width: min(200px, 70vw);
  height: auto;
}
.site-footer p { color: var(--text-soft); margin: 0 0 0.25rem; }
.site-footer nav {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.site-footer nav a {
  text-decoration: none;
  color: var(--text-soft);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}
.site-footer nav a:hover { color: var(--accent); }
.copyright {
  margin-top: var(--space-m);
  color: var(--text-soft);
  font-size: var(--step--1);
}

/* ---------- Phone / small screens ---------- */
@media (max-width: 700px) {
  body {
    overflow-x: clip;
  }

  .site-header {
    padding: 0.75rem 1rem;
    padding-top: max(0.75rem, env(safe-area-inset-top));
  }

  .brand-mark {
    width: 1.6rem;
    height: 1.6rem;
  }

  .brand-text {
    font-size: 1.05rem;
  }

  main > section {
    padding: var(--space-l) 1rem;
  }

  .hero {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    min-height: auto;
    padding-top: calc(var(--space-l) + 0.5rem);
    padding-bottom: var(--space-l);
    overflow: hidden;
  }

  .hero-veil {
    display: none;
  }

  .hero-field {
    position: relative;
    inset: auto;
    order: 5;
    width: 100%;
    height: 220px;
    margin-top: var(--space-m);
    opacity: 0.95;
  }

  .brand-signal {
    order: 1;
    margin-bottom: var(--space-m);
  }

  .brand-signal-line {
    display: block;
    max-width: 11ch;
    font-size: clamp(2.1rem, 11vw, 2.75rem);
    line-height: 1.12;
    padding-bottom: 0.12em;
  }

  .hero h1 {
    order: 2;
    max-width: 14ch;
    font-size: clamp(1.45rem, 6.2vw, 1.85rem);
  }

  .hero .lede {
    order: 3;
    max-width: 36ch;
    font-size: var(--step-0);
  }

  .hero .cta-row {
    order: 4;
  }

  .cta-row {
    gap: 0.6rem;
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
    max-width: none;
    padding: 0.9rem 1.2rem;
  }

  .holo-viewport,
  #holo-canvas {
    min-height: 340px;
  }

  .holo-panel {
    padding: var(--space-m) 1rem;
  }

  .product-title-row h3 {
    font-size: var(--step-2);
  }

  .product-switcher {
    grid-template-columns: repeat(2, 1fr);
  }

  .holo-hint {
    left: 0.75rem;
    bottom: 0.75rem;
    font-size: 0.65rem;
  }

  .edge-list li {
    grid-template-columns: 2.75rem 1fr;
    gap: var(--space-s);
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    padding-bottom: max(var(--space-xl), env(safe-area-inset-bottom));
  }

  input,
  select,
  textarea {
    font-size: 16px; /* prevent iOS input zoom */
  }

  .contact form .button {
    width: 100%;
    max-width: none;
    justify-self: stretch;
  }
}

@media (max-width: 420px) {
  .button {
    max-width: none;
  }
}