/* ==========================================================================
   Terra Sense — "Stilla mark" design system
   ========================================================================== */

:root {
  /* Palette */
  --paper: #faf6ee;
  --paper-warm: #f3ecdd;
  --ink: #2f4f4f;
  --ink-soft: #4a5d58;
  --apple: #3e7a4e;
  --sage: #9db98a;
  --amber: #c9a24b;
  --earth: #8a6d3b;
  --card: #ffffff;
  --hairline: rgba(47, 79, 79, 0.10);
  --hairline-strong: rgba(47, 79, 79, 0.35);

  /* BBiC triangle (variant A) */
  --bbic-rose: #e5aca6;
  --bbic-rose-ink: #6b3a34;
  --bbic-gold: #e0c87e;
  --bbic-gold-ink: #5f5026;
  --bbic-green: #aecba0;
  --bbic-green-ink: #3d5233;

  /* Type */
  --font-serif: "Fraunces", "Georgia", serif;
  --font-sans: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  --radius: 14px;
  --radius-pill: 999px;
  --shell-max: 1120px;
}

/* Reset ------------------------------------------------------------------ */

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

img, svg { max-width: 100%; height: auto; }

a { color: var(--apple); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.12;
  margin: 0 0 var(--space-4);
  color: var(--ink);
}

p { margin: 0 0 var(--space-4); }

/* Skip link */
.ts-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 18px;
  border-radius: 0 0 var(--radius) 0;
  z-index: 100;
}
.ts-skip:focus { left: 0; }

/* Canvas layer ------------------------------------------------------------ */

#leaves {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* Everything above the canvas */
.ts-header, main, .ts-footer { position: relative; z-index: 1; }

/* Shell ------------------------------------------------------------------- */

.ts-shell {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Header ------------------------------------------------------------------ */

.ts-header {
  border-bottom: 1px solid var(--hairline);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.ts-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding: var(--space-3) var(--space-6);
  max-width: var(--shell-max);
  margin: 0 auto;
}

.ts-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  font-size: 15px;
  color: var(--ink);
}
.ts-brand:hover { text-decoration: none; }
.ts-brand__logo { width: auto; height: 38px; flex: none; }
.ts-brand__sub {
  display: block;
  font-weight: 600;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--earth);
}

.ts-nav { display: flex; align-items: center; gap: var(--space-5); }
.ts-nav a {
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 600;
}
.ts-nav a:hover { color: var(--ink); text-decoration: none; }

.ts-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 6px 14px;
  cursor: pointer;
}

/* Chapters ---------------------------------------------------------------- */

.ts-chapter {
  padding: var(--space-9) 0;
  position: relative;
}

/* Tinted bands: painted by the canvas when JS runs; CSS fallback otherwise */
.ts-chapter--tinted { background: var(--paper-warm); }
.js-leaves .ts-chapter--tinted { background: transparent; }

.ts-kicker {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--earth);
  margin-bottom: var(--space-3);
}

.ts-eyebrow {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--earth);
  margin-bottom: var(--space-4);
}

.ts-title { font-size: clamp(30px, 4.5vw, 44px); }
h1.ts-title { font-size: clamp(36px, 6vw, 56px); }

.ts-lead {
  font-size: 19px;
  color: var(--ink-soft);
  max-width: 620px;
}

/* Chapters where a leaf formation lives beside the text */
.ts-chapter--aside .ts-chapter__text { max-width: 560px; }

/* Breathing interludes: leaf-only space between chapters on narrow screens.
   Only shown when the leaf engine runs (html.js-leaves) — no empty gaps
   without JS — and only below the corridor breakpoint. */
.ts-interlude { display: none; }
@media (max-width: 900px) {
  .js-leaves .ts-interlude {
    display: block;
    height: 52vh;
    position: relative;
    z-index: 1;
  }
}

/* Hero -------------------------------------------------------------------- */

.ts-hero {
  padding: var(--space-10) 0;
  text-align: center;
}
.ts-hero .ts-lead { margin-left: auto; margin-right: auto; }

.ts-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}
.ts-hero .ts-actions, .ts-center .ts-actions { justify-content: center; }

.ts-statline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  justify-content: center;
  margin-top: var(--space-6);
  font-size: 14px;
  color: var(--earth);
}

/* Buttons ------------------------------------------------------------------ */

.ts-btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.ts-btn:hover { text-decoration: none; transform: translateY(-1px); }

.ts-btn--primary {
  background: var(--ink);
  color: var(--paper);
}
.ts-btn--primary:hover { box-shadow: 0 6px 18px rgba(47, 79, 79, 0.25); }

.ts-btn--ghost {
  border-color: var(--hairline-strong);
  color: var(--ink);
  background: transparent;
}
.ts-btn--ghost:hover { background: rgba(47, 79, 79, 0.05); }

/* Cards & grids ------------------------------------------------------------ */

.ts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.ts-card {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: var(--space-5);
}

.ts-card h3 { font-size: 20px; margin-bottom: var(--space-2); }
.ts-card p { font-size: 15px; color: var(--ink-soft); margin-bottom: 0; }

.ts-meta {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--earth);
  margin-bottom: var(--space-2);
}

/* Pills -------------------------------------------------------------------- */

.ts-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0;
  margin: var(--space-3) 0 var(--space-5);
  list-style: none;
}
.ts-pill {
  background: var(--card);
  border: 1px solid rgba(47, 79, 79, 0.14);
  border-radius: var(--radius-pill);
  font-size: 14px;
  padding: 6px 14px;
  color: var(--ink);
}

/* Split layouts ------------------------------------------------------------ */

.ts-split {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-7);
  align-items: start;
  margin-top: var(--space-5);
}

.ts-about-card { text-align: left; }
.ts-about-card .ts-photo {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 10px;
  background: linear-gradient(135deg, #dce7d2, var(--paper-warm));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--earth);
  text-align: center;
  margin-bottom: var(--space-3);
  overflow: hidden;
}
.ts-about-card .ts-photo img { width: 100%; height: 100%; object-fit: cover; }
.ts-about-card strong { display: block; font-size: 16px; }

/* Blog cards / posts -------------------------------------------------------- */

.ts-post-card { display: block; color: inherit; }
.ts-post-card:hover { text-decoration: none; border-color: var(--hairline-strong); }
.ts-post-card h3 { color: var(--ink); }
.ts-post-card:hover h3 { color: var(--apple); }

.ts-more {
  display: inline-block;
  margin-top: var(--space-5);
  font-weight: 600;
  color: var(--apple);
}

.ts-post {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-9);
}
.ts-post h1 { font-size: clamp(30px, 5vw, 42px); }
.ts-post__meta { color: var(--earth); font-size: 14px; margin-bottom: var(--space-6); }
.ts-post__body p { color: var(--ink-soft); }
.ts-post__body h2 { font-size: 24px; margin-top: var(--space-6); }
.ts-post__signature {
  margin-top: var(--space-6);
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--ink);
}
.ts-post__back { display: inline-block; margin-top: var(--space-6); font-weight: 600; }

/* Contact ------------------------------------------------------------------ */

.ts-contact-details {
  margin-top: var(--space-5);
  font-size: 15px;
  color: var(--ink-soft);
}
.ts-contact-details span { display: block; }

/* Footer ------------------------------------------------------------------- */

.ts-footer {
  background: var(--ink);
  color: rgba(250, 246, 238, 0.85);
  font-size: 14px;
  margin-top: var(--space-8);
}
.ts-footer__inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  justify-content: space-between;
  align-items: center;
}
.ts-footer a { color: var(--paper); }

/* Reveal animations ---------------------------------------------------------
   Elements start hidden only when JS is present (html.js, set in <head>).
   html.js-leaves is added by leaves.js when the canvas engine starts. */

.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* BBiC figure ---------------------------------------------------------------- */

.ts-bbic {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: var(--space-5);
  text-align: center;
}
.ts-bbic figcaption {
  font-size: 13px;
  color: var(--earth);
  margin-top: var(--space-2);
}

/* Responsive ----------------------------------------------------------------- */

@media (max-width: 900px) {
  .ts-grid { grid-template-columns: 1fr; }
  .ts-split { grid-template-columns: 1fr; gap: var(--space-5); }
  .ts-chapter { padding: var(--space-8) 0; }
  .ts-hero { padding: var(--space-8) 0; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .ts-shell { padding: 0 var(--space-5); }
  .ts-header__inner { padding: var(--space-3) var(--space-5); }
  .ts-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--hairline);
    padding: var(--space-2) var(--space-5) var(--space-4);
  }
  .ts-nav.is-open { display: flex; }
  .ts-nav a { display: block; padding: var(--space-2) 0; font-size: 16px; }
  .ts-nav-toggle { display: inline-block; }
  .ts-brand__text { font-size: 13px; }
}

/* Reduced motion --------------------------------------------------------------- */

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