/* ==========================================================================
   OnTechLab — style.css
   Layers: reset → tokens → base → layout → components → utilities
   All spatial values use logical properties.
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ---------- 2. Tokens ---------- */
:root {
  /* Color — OnTechLab identity: Persian Blue / Pale Sky / Platinum / Blue Slate / Deep Walnut */
  --color-ink-900: #0A1525;
  --color-ink-800: #0C1A2E;
  --color-ink-700: #10233C;
  --color-sky: #8CC4E2;
  --color-sky-strong: #B7DCF0;
  --color-walnut: #C4A26E;
  --color-platinum: #E7EDF2;
  --color-slate: #93A7BA;
  --color-line: rgba(140, 196, 226, 0.14);
  --color-line-strong: rgba(140, 196, 226, 0.3);
  --color-tint: rgba(140, 196, 226, 0.04);
  --color-tint-strong: rgba(140, 196, 226, 0.08);

  --color-bg: var(--color-ink-900);
  --color-text: var(--color-slate);
  --color-heading: var(--color-platinum);
  --color-accent: var(--color-sky);
  --color-on-accent: #081120;

  /* Typography */
  --font-sans: "Space Grotesk", "Segoe UI", system-ui, -apple-system, sans-serif;
  --text-xs: clamp(0.72rem, 0.7rem + 0.1vw, 0.78rem);
  --text-sm: clamp(0.85rem, 0.82rem + 0.15vw, 0.95rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.15rem, 1.05rem + 0.5vw, 1.4rem);
  --text-xl: clamp(1.5rem, 1.3rem + 1vw, 2.1rem);
  --text-2xl: clamp(1.9rem, 1.5rem + 2vw, 3rem);
  --text-hero: clamp(2.4rem, 1.8rem + 3.4vw, 4.4rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Shape & motion */
  --radius-sm: 0.5rem;
  --radius-md: 0.85rem;
  --radius-full: 999px;
  --motion-fast: 180ms ease;
  --motion-slow: 600ms cubic-bezier(0.22, 1, 0.36, 1);

  /* Z-index hierarchy (mandatory) */
  --z-navbar: 1001;
  --z-drawer: 1500;
  --z-lightbox: 2000;
}

/* Optional light theme hook (brand default is dark) */
[data-theme="light"] {
  --color-bg: #F4F8FB;
  --color-text: #3D5268;
  --color-heading: #0A1525;
  --color-line: rgba(10, 21, 37, 0.12);
  --color-tint: rgba(10, 21, 37, 0.03);
  --color-tint-strong: rgba(10, 21, 37, 0.06);
}

/* ---------- 3. Fonts (self-hosted, GDPR-compliant) ---------- */
@font-face {
  font-family: "Space Grotesk";
  src: url("assets/fonts/space-grotesk-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Space Grotesk";
  src: url("assets/fonts/space-grotesk-latin-500-normal.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Space Grotesk";
  src: url("assets/fonts/space-grotesk-latin-700-normal.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* ---------- 4. Base ---------- */
html {
  scroll-behavior: smooth;
  scroll-padding-block-start: 5.5rem;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background:
    linear-gradient(160deg, var(--color-ink-900) 0%, var(--color-ink-800) 50%, #091322 100%)
    fixed var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* Subtle lab-grid texture (from the OTL dashboard) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(140, 196, 226, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 196, 226, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

h1, h2, h3 {
  color: var(--color-heading);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { max-inline-size: 65ch; }

a {
  color: var(--color-accent);
  text-decoration: none;
}

img { display: block; max-inline-size: 100%; block-size: auto; }

ul, ol { list-style: none; }

:focus-visible {
  outline: 2px solid var(--color-sky-strong);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: var(--color-sky);
  color: var(--color-on-accent);
}

/* ---------- 5. Layout ---------- */
.container {
  inline-size: min(100% - 2rem, 1200px);
  margin-inline: auto;
}

main { position: relative; z-index: 1; }

.section {
  padding-block: var(--space-24);
  border-block-start: 1px solid var(--color-line);
}

.section--tinted { background: var(--color-tint); }

.section__title {
  font-size: var(--text-2xl);
  margin-block-end: var(--space-4);
  max-inline-size: 22ch;
}

.section__sub {
  font-size: var(--text-lg);
  margin-block-end: var(--space-12);
  max-inline-size: 52ch;
}

.eyebrow {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--color-sky);
  margin-block-end: var(--space-3);
}

/* Eyebrow arc tick — echo of the logo arch */
.eyebrow::before {
  content: "";
  display: inline-block;
  inline-size: 14px;
  block-size: 7px;
  margin-inline-end: var(--space-2);
  border: 1.5px solid var(--color-sky);
  border-block-end: none;
  border-start-start-radius: 14px;
  border-start-end-radius: 14px;
  vertical-align: baseline;
}

/* ---------- 6. Components ---------- */

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  padding-block: 0.8em;
  padding-inline: 1.6em;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--motion-fast), border-color var(--motion-fast),
              color var(--motion-fast), transform var(--motion-fast);
}

.btn--primary {
  background: var(--color-sky);
  color: var(--color-on-accent);
  box-shadow: 0 0 24px rgba(140, 196, 226, 0.25);
}
.btn--primary:hover {
  background: var(--color-sky-strong);
  transform: translateY(-1px);
}

.btn--ghost {
  color: var(--color-platinum);
  border-color: var(--color-line-strong);
}
.btn--ghost:hover {
  border-color: var(--color-sky);
  color: var(--color-sky);
}

.btn--sm { padding-block: 0.55em; padding-inline: 1.2em; }
.btn--lg { font-size: var(--text-base); }

/* --- Navbar --- */
.navbar {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-navbar);
  background: rgba(10, 21, 37, 0.82);
  backdrop-filter: blur(12px);
  border-block-end: 1px solid var(--color-line);
}

.navbar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  min-block-size: 4.25rem;
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar__logo { inline-size: auto; block-size: 1.6rem; }

.navbar__logo-sub {
  font-size: var(--text-xs);
  color: var(--color-slate);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-inline-start: 1px solid var(--color-line-strong);
  padding-inline-start: var(--space-3);
  white-space: nowrap;
}

.navbar__nav { display: none; }

.navbar__list {
  display: flex;
  gap: var(--space-6);
}

.navbar__link {
  font-size: var(--text-sm);
  color: var(--color-slate);
  transition: color var(--motion-fast);
}
.navbar__link:hover,
.navbar__link[aria-current="page"] { color: var(--color-platinum); }

.navbar__actions {
  margin-inline-start: auto; /* logical — auto-adapts to RTL */
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.navbar__actions .btn { display: none; }

.navbar__burger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 2.6rem;
  block-size: 2.6rem;
  background: transparent;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  color: var(--color-platinum);
  cursor: pointer;
}

@media (min-width: 800px) {
  .navbar__nav { display: block; }
  .navbar__actions .btn { display: inline-block; }
  .navbar__burger { display: none; }
}

@media (max-width: 480px) {
  .navbar__logo-sub { display: none; }
}

/* --- Language switch --- */
.lang-switch {
  display: flex;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-full);
  padding: 2px;
  gap: 2px;
}

.lang-switch__btn {
  font-family: inherit;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-slate);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  padding: 0.3em 0.75em;
  cursor: pointer;
  transition: background var(--motion-fast), color var(--motion-fast);
}
.lang-switch__btn:hover { color: var(--color-platinum); }
.lang-switch__btn[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.lang-switch--drawer { justify-content: center; margin-block: var(--space-2); }

/* --- Drawer --- */
.drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  visibility: hidden;
  pointer-events: none;
}
.drawer.is-open {
  visibility: visible;
  pointer-events: auto;
}

.drawer__overlay {
  position: absolute;
  inset: 0;
  background: rgba(5, 10, 20, 0.6);
  opacity: 0;
  transition: opacity var(--motion-fast);
}
.drawer.is-open .drawer__overlay { opacity: 1; }

.drawer__panel {
  position: absolute;
  inset-block: 0;
  inset-inline-end: 0;
  inline-size: min(85vw, 22rem);
  background: var(--color-ink-800);
  border-inline-start: 1px solid var(--color-line);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--motion-fast);
}
[dir="rtl"] .drawer__panel { transform: translateX(-100%); }
.drawer.is-open .drawer__panel { transform: translateX(0); }

.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer__logo { inline-size: auto; block-size: 1.3rem; }

.drawer__close {
  inline-size: 2.4rem;
  block-size: 2.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  color: var(--color-platinum);
  cursor: pointer;
}

.drawer__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.drawer__link {
  display: block;
  padding-block: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-platinum);
  border-block-end: 1px solid var(--color-line);
}

.drawer__cta { text-align: center; margin-block-start: auto; }

/* --- Hero --- */
.hero {
  position: relative;
  padding-block-start: calc(4.25rem + var(--space-24));
  padding-block-end: 0;
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__title {
  font-size: var(--text-hero);
  letter-spacing: -0.02em;
  max-inline-size: 18ch;
  margin-block-end: var(--space-6);
}

.hero__accent { color: var(--color-sky); }

.hero__sub {
  font-size: var(--text-lg);
  max-inline-size: 56ch;
  margin-block-end: var(--space-8);
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
  margin-block-end: var(--space-8);
}

/* Signature: the bridge/arch from the logo rationale */
.hero__arch { inline-size: min(100%, 1200px); margin-inline: auto; }
.hero__arch svg { inline-size: 100%; block-size: auto; display: block; }

.arch__horizon {
  stroke: var(--color-line-strong);
  stroke-width: 1.5;
}

.arch__path {
  fill: none;
  stroke: var(--color-sky);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  filter: drop-shadow(0 0 10px rgba(140, 196, 226, 0.45));
  animation: arch-draw 1.8s cubic-bezier(0.22, 1, 0.36, 1) 0.3s forwards;
}

.arch__node { fill: var(--color-sky); }
.arch__node--end { fill: var(--color-walnut); }

.arch__label {
  fill: var(--color-slate);
  font-family: var(--font-sans);
  font-size: 15px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

@keyframes arch-draw {
  to { stroke-dashoffset: 0; }
}

/* --- Status strip --- */
.status-strip {
  background: var(--color-tint);
  border-block: 1px solid var(--color-line);
}

.status-strip__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-block: var(--space-3);
}

.status-strip__dot {
  inline-size: 8px;
  block-size: 8px;
  border-radius: var(--radius-full);
  background: var(--color-sky);
  box-shadow: 0 0 8px rgba(140, 196, 226, 0.8);
  animation: pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

.status-strip__text {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: rgba(140, 196, 226, 0.7);
}

@keyframes pulse {
  50% { opacity: 0.4; }
}

/* --- The Lab --- */
.lab__grid {
  display: grid;
  gap: var(--space-12);
  margin-block-start: var(--space-8);
}

@media (min-width: 800px) {
  .lab__grid { grid-template-columns: 1fr 1.2fr; }
}

.lab__lede {
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-platinum);
  line-height: 1.4;
}

.lab__points {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.lab__point {
  border-inline-start: 2px solid var(--color-line-strong);
  padding-inline-start: var(--space-6);
}

.lab__point-title {
  font-size: var(--text-lg);
  margin-block-end: var(--space-2);
}

/* --- Divisions --- */
.divisions__grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(340px, 100%), 1fr));
}

.division {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  background: var(--color-tint);
  transition: border-color var(--motion-fast), background var(--motion-fast);
}

.division--mammut:hover {
  border-color: rgba(140, 196, 226, 0.45);
  background: rgba(140, 196, 226, 0.07);
}

.division--camel:hover {
  border-color: rgba(196, 162, 110, 0.45);
  background: rgba(196, 162, 110, 0.06);
}

.division__head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-block-end: var(--space-2);
}

.division__emoji { font-size: 1.6rem; }

.division__name { font-size: var(--text-xl); }

.division__tag {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-block-end: var(--space-4);
}
.division--mammut .division__tag { color: var(--color-sky); }
.division--camel .division__tag { color: var(--color-walnut); }

/* --- Approach steps (a genuine sequence — numbering carries meaning) --- */
.steps {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
  counter-reset: step;
}

.step {
  border-block-start: 2px solid var(--color-line-strong);
  padding-block-start: var(--space-6);
}

.step__num {
  display: block;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-walnut);
  margin-block-end: var(--space-3);
}

.step__title {
  font-size: var(--text-lg);
  margin-block-end: var(--space-2);
}

.step__desc { font-size: var(--text-sm); }

/* --- Principles --- */
.principles__grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  margin-block-start: var(--space-8);
}

.principle {
  background: var(--color-tint-strong);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}

.principle__title {
  font-size: var(--text-base);
  margin-block-end: var(--space-3);
  color: var(--color-sky-strong);
}

.principle p { font-size: var(--text-sm); }

/* --- Investors --- */
.investors {
  display: grid;
  gap: var(--space-12);
  align-items: center;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  background:
    radial-gradient(circle at 85% 20%, rgba(140, 196, 226, 0.08), transparent 60%),
    var(--color-tint);
  padding: var(--space-12);
}

@media (min-width: 800px) {
  .investors { grid-template-columns: 1.6fr 1fr; }
}

.investors__title { margin-block-end: var(--space-4); }

.investors__desc { margin-block-end: var(--space-8); }

.investors__badge {
  justify-self: center;
  text-align: center;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  padding: var(--space-8) var(--space-12);
  background: rgba(140, 196, 226, 0.06);
}

.investors__stage {
  display: block;
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-sky);
  text-shadow: 0 0 24px rgba(140, 196, 226, 0.5);
}

.investors__stage-sub {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-slate);
}

/* --- Contact / CTA --- */
.section--cta { text-align: center; }

.contact__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact__title {
  font-size: var(--text-2xl);
  max-inline-size: 20ch;
  margin-block-end: var(--space-4);
}

.contact__sub {
  max-inline-size: 50ch;
  margin-block-end: var(--space-8);
}

/* --- Footer --- */
.footer {
  position: relative;
  z-index: 1;
  border-block-start: 1px solid var(--color-line);
  background: rgba(140, 196, 226, 0.02);
}

.footer__inner {
  display: grid;
  gap: var(--space-8);
  padding-block: var(--space-12);
}

@media (min-width: 800px) {
  .footer__inner { grid-template-columns: 2fr 1fr 1fr; }
}

.footer__logo { margin-block-end: var(--space-3); opacity: 0.85; }

.footer__tagline { font-size: var(--text-sm); }

.footer__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-slate);
  transition: color var(--motion-fast);
}
.footer__link:hover,
.footer__link[aria-current="page"] { color: var(--color-platinum); }

.footer__base {
  border-block-start: 1px solid var(--color-line);
  padding-block: var(--space-4);
}

.footer__copy {
  font-size: var(--text-xs);
  color: rgba(147, 167, 186, 0.6);
}

/* --- Legal pages --- */
.legal {
  padding-block-start: calc(4.25rem + var(--space-16));
  padding-block-end: var(--space-24);
}

.legal__title {
  font-size: var(--text-2xl);
  margin-block-end: var(--space-8);
}

.legal h2 {
  font-size: var(--text-lg);
  margin-block-start: var(--space-8);
  margin-block-end: var(--space-3);
}

.legal p,
.legal li {
  margin-block-end: var(--space-3);
  max-inline-size: 70ch;
}

.legal ul {
  list-style: disc;
  padding-inline-start: var(--space-6);
}

.legal .placeholder {
  color: var(--color-walnut);
}

/* ---------- 7. Utilities ---------- */
.skip-link {
  position: absolute;
  inset-block-start: -100%;
  inset-inline-start: var(--space-4);
  z-index: calc(var(--z-lightbox) + 1);
  background: var(--color-sky);
  color: var(--color-on-accent);
  padding: var(--space-3) var(--space-6);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 500;
}
.skip-link:focus {
  inset-block-start: 0;
}

.visually-hidden {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--motion-slow), transform var(--motion-slow);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* No-JS fallback: content always visible */
.no-js .reveal { opacity: 1; transform: none; }

/* ---------- 8. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
  .arch__path { stroke-dashoffset: 0; animation: none; }
  .status-strip__dot { animation: none; }
}