/* Oqiva Labs — engineered, mono-accent technical aesthetic */

:root {
  /* Surface */
  --bg: #FAFAF7;
  --bg-elev: #F4F3EE;
  --bg-soft: #EFEEE8;
  --line: rgba(20, 22, 18, 0.10);
  --line-strong: rgba(20, 22, 18, 0.18);
  --line-faint: rgba(20, 22, 18, 0.06);

  /* Foreground */
  --ink: #14160F;
  --ink-2: #2C2F26;
  --ink-mute: #6A6E5F;
  --ink-faint: #9AA08B;

  /* Accent — operations green */
  --accent: oklch(0.62 0.16 150);
  --accent-deep: oklch(0.45 0.14 152);
  --accent-soft: oklch(0.92 0.05 150);
  --accent-glow: oklch(0.78 0.13 150 / 0.22);

  /* Status */
  --warn: oklch(0.74 0.13 75);
  --info: oklch(0.62 0.10 240);

  /* Type */
  --font-display: "Space Grotesk", "IBM Plex Sans Thai", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Hanken Grotesk", "IBM Plex Sans Thai", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Geometry */
  --radius: 14px;
  --radius-sm: 8px;
  --radius-lg: 22px;

  /* Layout */
  --gutter: clamp(20px, 4vw, 48px);
  --maxw: 1280px;

  /* Density */
  --section-pad: clamp(96px, 12vw, 160px);
  --row-gap: clamp(40px, 6vw, 80px);
}

[data-density="compact"] {
  --section-pad: clamp(64px, 8vw, 110px);
  --row-gap: clamp(28px, 4vw, 56px);
}
[data-density="comfy"] {
  --section-pad: clamp(120px, 16vw, 200px);
  --row-gap: clamp(56px, 8vw, 112px);
}

[data-theme="dark"] {
  --bg: #0E100B;
  --bg-elev: #161A12;
  --bg-soft: #1C2017;
  --line: rgba(240, 240, 230, 0.10);
  --line-strong: rgba(240, 240, 230, 0.20);
  --line-faint: rgba(240, 240, 230, 0.06);
  --ink: #F2F2EA;
  --ink-2: #D6D8CC;
  --ink-mute: #8E9281;
  --ink-faint: #5C604F;
  --accent: oklch(0.74 0.16 150);
  --accent-deep: oklch(0.85 0.14 150);
  --accent-soft: oklch(0.32 0.08 150);
  --accent-glow: oklch(0.78 0.16 150 / 0.30);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
}

body {
  overflow-x: hidden;
}

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

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

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

/* Typography utilities */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}

.eyebrow-accent {
  color: var(--accent-deep);
}

.display-xl {
  font-family: var(--font-display);
  font-size: clamp(48px, 7.4vw, 112px);
  line-height: 0.96;
  letter-spacing: -0.035em;
  font-weight: 500;
  text-wrap: balance;
}

.display-lg {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.028em;
  font-weight: 500;
  text-wrap: balance;
}

.display-md {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 48px);
  line-height: 1.06;
  letter-spacing: -0.022em;
  font-weight: 500;
  text-wrap: balance;
}

.display-sm {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-weight: 500;
}

.body-lg {
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.55;
  color: var(--ink-2);
  text-wrap: pretty;
}

.body-md {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
  text-wrap: pretty;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  font-weight: 500;
}

/* Layout */
.shell {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section {
  padding-top: var(--section-pad);
  padding-bottom: var(--section-pad);
  position: relative;
  border-top: 1px solid var(--line);
}

/* Subtle baseline grid (decorative) */
.grid-rule {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-faint) 1px, transparent 1px);
  background-size: calc(100% / 12) 100%;
  background-position: 0 0;
  opacity: 0.5;
  mask-image: linear-gradient(to bottom, transparent, black 5%, black 95%, transparent);
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s cubic-bezier(0.2, 0.7, 0.2, 1),
              transform 0.9s cubic-bezier(0.2, 0.7, 0.2, 1);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px 14px 24px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  font-family: var(--font-body);
  transition: transform 0.2s cubic-bezier(0.2, 0.7, 0.2, 1),
              background 0.2s, color 0.2s, border-color 0.2s;
  border: 1px solid transparent;
  white-space: nowrap;
  position: relative;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--ink);
  color: var(--bg);
}
.btn-primary:hover {
  background: var(--accent-deep);
  color: var(--bg);
}
.btn-accent {
  background: var(--accent);
  color: #0E1208;
}
.btn-accent:hover {
  background: var(--accent-deep);
  color: var(--bg);
}
.btn-ghost {
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover {
  border-color: var(--ink);
  background: var(--bg-elev);
}

.btn .arr {
  transition: transform 0.25s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.btn:hover .arr { transform: translateX(3px); }

/* Pill tag */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  background: var(--bg);
}
.pill .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px var(--accent-glow); }
  50% { box-shadow: 0 0 0 6px transparent; }
}

/* Cards */
.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  overflow: hidden;
}
.card.elev {
  background: var(--bg-elev);
}

/* Hover lift */
.lift {
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.2, 1),
              border-color 0.3s, box-shadow 0.3s;
}
.lift:hover {
  transform: translateY(-3px);
  border-color: var(--ink);
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 18px 0;
  transition: background 0.3s, border-color 0.3s, padding 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  backdrop-filter: blur(20px) saturate(140%);
  border-bottom-color: var(--line);
  padding: 12px 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 8px 14px;
  font-size: 13.5px;
  color: var(--ink-2);
  border-radius: 999px;
  transition: background 0.2s, color 0.2s;
}
.nav-link:hover {
  background: var(--bg-elev);
  color: var(--ink);
}
.nav-cluster {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Wordmark */
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: -0.02em;
  font-weight: 500;
  color: var(--ink);
}
.wordmark .mark { width: 22px; height: 22px; }

/* Lang toggle */
.lang-toggle {
  display: inline-flex;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.lang-toggle button {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--ink-mute);
  transition: background 0.2s, color 0.2s;
}
.lang-toggle button.on {
  background: var(--ink);
  color: var(--bg);
}

/* Diagonal hatch background helper */
.hatch {
  background-image: repeating-linear-gradient(
    -45deg,
    var(--line-faint) 0,
    var(--line-faint) 1px,
    transparent 1px,
    transparent 8px
  );
}

/* Animated underline link */
.u-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  color: var(--ink);
  font-weight: 500;
  font-size: 14px;
}
.u-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 100%;
  background: var(--ink);
  transform-origin: left;
  transform: scaleX(0.4);
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.u-link:hover::after {
  transform: scaleX(1);
}
.u-link.accent { color: var(--accent-deep); }
.u-link.accent::after { background: var(--accent-deep); }

/* Marquee row */
.marquee {
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
}
.marquee-track {
  display: flex;
  gap: 56px;
  width: max-content;
  animation: scroll-x 50s linear infinite;
}
@keyframes scroll-x {
  to { transform: translateX(-50%); }
}

/* Diagram grid */
.dotgrid {
  background-image: radial-gradient(var(--line-strong) 1px, transparent 1px);
  background-size: 18px 18px;
  background-position: 0 0;
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 999px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--ink-mute); }

/* Sticky chrome heading */
.sticky-heading {
  position: sticky;
  top: 100px;
}

/* Caret blink */
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}
.caret { animation: blink 1.05s steps(2) infinite; }

/* Subtle shimmer for live demo */
@keyframes shimmer {
  0% { background-position: -200px 0; }
  100% { background-position: 200px 0; }
}
.shimmer-line {
  background: linear-gradient(90deg, var(--bg-soft) 0%, var(--bg-elev) 50%, var(--bg-soft) 100%);
  background-size: 400px 100%;
  animation: shimmer 1.6s infinite linear;
}

/* Ticker dot trail */
@keyframes orbit {
  to { transform: rotate(360deg); }
}

/* For Thai text use slightly larger line-height */
[lang="th"] .body-lg, [lang="th"] .body-md { line-height: 1.65; }
[lang="th"] .display-xl, [lang="th"] .display-lg, [lang="th"] .display-md, [lang="th"] .display-sm {
  line-height: 1.18;
  letter-spacing: -0.01em;
}

/* When language is th, body uses Plex Thai prominent */
html[lang="th"] {
  --font-body: "IBM Plex Sans Thai", "Hanken Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-display: "IBM Plex Sans Thai Looped", "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
}

/* Hide scrollbars on horizontal scrollers */
.no-scrollbar { scrollbar-width: none; }
.no-scrollbar::-webkit-scrollbar { display: none; }