/* ============================================================
   KP Personal Office - base: reset, typography, primitives
   ============================================================ */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-text);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--ink-body);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint paper grain via layered radial tints - atmosphere, not noise */
  background-image:
    radial-gradient(60rem 60rem at 82% -8%, oklch(94% 0.03 156 / 0.4), transparent 60%),
    radial-gradient(50rem 40rem at -10% 8%, oklch(96% 0.02 78 / 0.5), transparent 55%);
  background-attachment: fixed;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 460;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  font-optical-sizing: auto;
}

p { max-width: var(--measure); }

a { color: var(--evergreen); text-decoration: none; }
a:hover { color: var(--evergreen-deep); }

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

ul { list-style: none; padding: 0; }

::selection { background: var(--evergreen-tint); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--evergreen);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Layout primitives --- */
.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}
.wrap--narrow { max-width: var(--wrap-narrow); }

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

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -3.5rem;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); color: var(--paper); }

/* --- Eyebrow / labels --- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-text);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--evergreen);
}
.eyebrow::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: var(--bronze);
}
.eyebrow--center::before { display: none; }

/* --- Section heading block --- */
.section-head {
  display: grid;
  gap: var(--space-4);
  max-width: 48rem;
  margin-bottom: var(--space-12);
}
.section-head__num {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--ink-mute);
  font-feature-settings: "tnum";
}
.section-head h2 {
  font-size: var(--text-2xl);
}
.section-head p {
  font-size: var(--text-lg);
  color: var(--ink-body);
}

/* --- Buttons --- */
.btn {
  --btn-bg: var(--evergreen);
  --btn-fg: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-text);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.85rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--btn-bg);
  color: var(--btn-fg);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out);
  will-change: transform;
}
.btn:hover { color: var(--paper); transform: translateY(-2px); box-shadow: var(--shadow); background: var(--evergreen-deep); }
.btn:active { transform: translateY(0); }

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover {
  color: var(--ink);
  background: var(--surface);
  border-color: var(--evergreen);
}
.btn--on-deep { border-color: var(--line-on-deep); --btn-fg: var(--ink-on-deep); background: transparent; }
.btn--on-deep:hover { color: var(--paper-deep); background: var(--ink-on-deep); border-color: transparent; }

.btn--lg { padding: 1.05rem 2rem; font-size: var(--text-base); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: var(--text-sm);
}
.link-arrow .arrow { transition: transform var(--dur) var(--ease-out); }
.link-arrow:hover .arrow { transform: translateX(4px); }

/* --- Surface card --- */
.surface {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
}

/* --- Scroll reveal --- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
[data-reveal].is-in { opacity: 1; transform: none; }
[data-reveal][data-reveal-delay="1"] { transition-delay: 80ms; }
[data-reveal][data-reveal-delay="2"] { transition-delay: 160ms; }
[data-reveal][data-reveal-delay="3"] { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .btn, .link-arrow .arrow { transition: none; }
}