/* ============================================================
   Kortay Enterprises — preview landing page
   Hybrid light corporate + dark premium sections.
   Accents: teal (primary) + bronze (secondary).
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.1vw, 2.125rem);
  --text-2xl: clamp(2rem, 1.3rem + 2.4vw, 3.4rem);

  /* Spacing */
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem; --space-32: 8rem;

  /* Radii / shadow / transition */
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --shadow-sm: 0 1px 2px rgba(28, 40, 42, 0.06);
  --shadow-md: 0 6px 24px rgba(28, 40, 42, 0.08);
  --shadow-lg: 0 18px 48px rgba(28, 40, 42, 0.12);
  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  --content: 1140px;
  --gutter: clamp(1.25rem, 5vw, 3rem);

  --font-display: 'General Sans', system-ui, sans-serif;
  --font-body: 'Satoshi', system-ui, sans-serif;
}

/* ---------- Light (corporate) ---------- */
:root, [data-theme='light'] {
  --color-bg: #f8f8f6;
  --color-surface: #ffffff;
  --color-surface-2: #f1f2f0;
  --color-border: #e1e2de;
  --color-text: #181c1d;
  --color-text-muted: #5b6364;
  --color-text-faint: #9aa1a1;

  --color-primary: #0c6b72;        /* teal */
  --color-primary-hover: #084e54;
  --color-primary-soft: #e3eeee;

  --brand-accent: #a9772f;         /* bronze */
  --brand-accent-soft: #f0e6d6;

  /* dark-section tokens (used by KOS + footer) */
  --ink-bg: #10171a;
  --ink-surface: #18222600;
  --ink-text: #e7ecec;
  --ink-text-muted: #9bacac;
  --ink-border: #2a383b;
  --ink-teal: #43b3bd;
  --ink-bronze: #cfa162;
}

/* ---------- Dark (premium) ---------- */
[data-theme='dark'] {
  --color-bg: #0e1416;
  --color-surface: #151e21;
  --color-surface-2: #1a2528;
  --color-border: #28363a;
  --color-text: #e6ecec;
  --color-text-muted: #95a4a4;
  --color-text-faint: #5f6e6e;

  --color-primary: #43b3bd;
  --color-primary-hover: #6ccad3;
  --color-primary-soft: #16282b;

  --brand-accent: #cfa162;
  --brand-accent-soft: #2a2419;

  --ink-bg: #0a0f11;
  --ink-text: #e7ecec;
  --ink-text-muted: #9bacac;
  --ink-border: #243033;
  --ink-teal: #43b3bd;
  --ink-bronze: #cfa162;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0e1416; --color-surface: #151e21; --color-surface-2: #1a2528;
    --color-border: #28363a; --color-text: #e6ecec; --color-text-muted: #95a4a4;
    --color-primary: #43b3bd; --color-primary-hover: #6ccad3; --color-primary-soft: #16282b;
    --brand-accent: #cfa162;
  }
}

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

html {
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  transition: background var(--transition), color var(--transition);
}

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

h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.12; text-wrap: balance; font-weight: 600; }
p { text-wrap: pretty; }

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

:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: 6px; }

::selection { background: var(--color-primary-soft); color: var(--color-primary-hover); }

a, button, .biz-card { transition: color var(--transition), background var(--transition),
  border-color var(--transition), box-shadow var(--transition), transform var(--transition); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

.container { width: 100%; max-width: var(--content); margin-inline: auto; padding-inline: var(--gutter); }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--color-primary); color: #fff; padding: var(--space-3) var(--space-5);
  border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus { left: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 600; font-family: var(--font-display);
  padding: 0.7rem 1.35rem; border-radius: var(--radius-md);
  border: 1px solid transparent; cursor: pointer;
}
.btn--primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn--ghost { background: transparent; color: var(--color-text); border-color: var(--color-border); }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ---------- Eyebrow / shared section heads ---------- */
.eyebrow {
  display: inline-block; font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--brand-accent); margin-bottom: var(--space-4);
}
.eyebrow--light { color: var(--ink-bronze); }

.accent-text { color: var(--color-primary); }

.section { padding-block: clamp(var(--space-16), 9vw, var(--space-32)); }
.section--alt { background: var(--color-surface-2); }
.section__head { max-width: 640px; margin-bottom: var(--space-12); }
.section__title { font-size: var(--text-xl); margin-bottom: var(--space-4); letter-spacing: -0.01em; }
.section__intro { color: var(--color-text-muted); font-size: var(--text-base); }

/* ---------- Header ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
}
.header.is-scrolled { border-bottom-color: var(--color-border); box-shadow: var(--shadow-sm); }
.header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); padding-block: var(--space-4); }

.brand { display: inline-flex; align-items: center; gap: var(--space-3); color: var(--color-text); }
.brand__mark { color: var(--color-primary); display: inline-flex; }
.brand__name { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; letter-spacing: -0.01em; line-height: 1; }
.brand__sub { display: block; font-size: 0.7rem; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--color-text-faint); margin-top: 3px; }

.nav { display: flex; gap: var(--space-8); }
.nav a { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted); }
.nav a:hover { color: var(--color-text); }

.header__actions { display: flex; align-items: center; gap: var(--space-4); }
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: var(--radius-md);
  background: transparent; border: 1px solid var(--color-border); color: var(--color-text-muted); cursor: pointer;
}
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-block: clamp(var(--space-20), 12vw, var(--space-32)); }
.hero__grid-bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 30% 0%, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 30% 0%, #000 0%, transparent 75%);
}
.hero__inner { position: relative; z-index: 1; max-width: 880px; }
.hero__title { font-size: var(--text-2xl); letter-spacing: -0.02em; margin-bottom: var(--space-6); }
.hero__lede { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 60ch; margin-bottom: var(--space-8); line-height: 1.55; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-bottom: var(--space-16); }

.hero__scope {
  max-width: 58ch;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* ---------- Businesses grid ---------- */
.biz-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.biz-card {
  display: flex; flex-direction: column;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-6);
  box-shadow: var(--shadow-sm); min-height: 200px;
}
a.biz-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--color-primary); }
.biz-card__top { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-5); }
.biz-card__tag {
  font-size: var(--text-xs); font-weight: 600; font-family: var(--font-display);
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--brand-accent); background: var(--brand-accent-soft);
  padding: 0.3rem 0.6rem; border-radius: 999px;
}
.biz-card__platform { font-size: var(--text-xs); color: var(--color-text-faint); font-weight: 500; }
.biz-card__arrow { color: var(--color-text-faint); font-size: 1.1rem; }
a.biz-card:hover .biz-card__arrow { color: var(--color-primary); transform: translate(2px, -2px); }
.biz-card__name { font-size: var(--text-lg); margin-bottom: var(--space-3); letter-spacing: -0.01em; }
.biz-card__desc { color: var(--color-text-muted); font-size: var(--text-sm); flex: 1; }
.biz-card__link { margin-top: var(--space-5); font-size: var(--text-sm); font-weight: 600; color: var(--color-primary); }
.biz-card__link--muted { color: var(--color-text-faint); font-weight: 500; }
.biz-card__note {
  margin-top: var(--space-5); font-size: var(--text-xs); color: var(--color-text-faint);
  font-style: italic; border-top: 1px dashed var(--color-border); padding-top: var(--space-3);
}
.biz-card--static { cursor: default; }

/* ---------- What we build ---------- */
.build-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
.build-card {
  position: relative; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-8); overflow: hidden;
}
.build-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(var(--color-primary), var(--brand-accent)); opacity: 0.7;
}
.build-card__index { font-family: var(--font-display); font-weight: 600; font-size: var(--text-sm); color: var(--brand-accent); letter-spacing: 0.1em; }
.build-card__title { font-size: var(--text-lg); margin: var(--space-3) 0 var(--space-3); }
.build-card p { color: var(--color-text-muted); font-size: var(--text-sm); }

/* ---------- KOS (dark premium) ---------- */
.kos { position: relative; overflow: hidden; background: var(--ink-bg); color: var(--ink-text); text-align: center; }
.kos__grid-bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--ink-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-border) 1px, transparent 1px);
  background-size: 56px 56px; opacity: 0.5;
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 0%, transparent 72%);
}
.kos::after {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: radial-gradient(ellipse 50% 60% at 50% 0%, color-mix(in srgb, var(--ink-teal) 16%, transparent), transparent 70%);
}
.kos__inner { position: relative; z-index: 1; max-width: 720px; margin-inline: auto; }
.kos__title {
  font-size: clamp(3rem, 8vw, 5.5rem); letter-spacing: 0.04em; font-weight: 600;
  background: linear-gradient(120deg, var(--ink-teal), var(--ink-bronze));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-5);
}
.kos__statement { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 500; color: var(--ink-text); margin: 0 auto var(--space-5); max-width: 48ch; }
.kos__support { color: var(--ink-text-muted); font-size: var(--text-base); max-width: 52ch; margin: 0 auto var(--space-10); }
.kos__pillars { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-4); }
.kos__pillar {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 500; color: var(--ink-text);
  border: 1px solid var(--ink-border); border-radius: 999px; padding: 0.55rem 1.1rem;
  background: color-mix(in srgb, var(--ink-text) 4%, transparent);
}
.kos__pillar span { color: var(--ink-teal); }

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact__inner { max-width: 640px; margin-inline: auto; }
.contact__intro { color: var(--color-text-muted); margin: 0 auto var(--space-8); max-width: 48ch; }
.contact__email {
  display: inline-block; font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.5rem, 4vw, 2.5rem); letter-spacing: -0.01em; color: var(--color-primary);
  border-bottom: 2px solid transparent; padding-bottom: 4px;
}
.contact__email:hover { color: var(--color-primary-hover); border-bottom-color: var(--brand-accent); }

/* ---------- Footer ---------- */
.footer { background: var(--ink-bg); color: var(--ink-text-muted); border-top: 1px solid var(--ink-border); padding-block: var(--space-12); }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-6); }
.footer__brand { display: inline-flex; align-items: center; gap: var(--space-3); color: var(--ink-text); font-family: var(--font-display); font-weight: 600; }
.footer__brand .brand__mark { color: var(--ink-teal); }
.footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-6); }
.footer__nav a { font-size: var(--text-sm); color: var(--ink-text-muted); }
.footer__nav a:hover { color: var(--ink-teal); }
.footer__copy { font-size: var(--text-xs); width: 100%; color: var(--ink-text-muted); opacity: 0.7; padding-top: var(--space-4); border-top: 1px solid var(--ink-border); }

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .biz-grid { grid-template-columns: repeat(2, 1fr); }
  .nav { display: none; }
}
@media (max-width: 640px) {
  .br-desktop { display: none; }
  .biz-grid, .build-grid { grid-template-columns: 1fr; }
  .nav__cta { display: none; }
  .hero__scope { max-width: 100%; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
}