/* ==========================================================================
   BASE — reset, type ladder, containers, buttons, tags, reveal, dialogs
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  background: var(--bg-white);
  color: var(--ink-primary);
  color-scheme: only light;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  background: var(--bg-white);
  color: var(--ink-primary);
  overflow-x: hidden;
}
/* `hidden` turns body into a scroll container, which silently breaks position:sticky
   in the pinned sections. `clip` stops horizontal overflow without doing that. */
@supports (overflow: clip) { body { overflow-x: clip; } }

body.scroll-locked { overflow: hidden; }

/* ---- Type ladder: family by role, size by ramp, leading/tracking by size ---- */
h1, h2, h3 { font-family: var(--font-serif); font-weight: 400; color: var(--ink-primary); text-wrap: balance; }
h1 { font-size: var(--type-title); line-height: var(--leading-display); letter-spacing: var(--tracking-display); }
h2 { font-size: var(--type-section); line-height: var(--leading-heading); letter-spacing: var(--tracking-title); }
h3 { font-size: var(--type-subsection); line-height: var(--leading-heading); letter-spacing: var(--tracking-heading); }
h4 { font-family: var(--font-sans); font-size: var(--text-lg); font-weight: 600; line-height: var(--leading-tight); letter-spacing: var(--tracking-normal); color: var(--ink-primary); }
p { color: var(--ink-secondary); line-height: var(--leading-body); }
em, .accent { font-style: italic; color: var(--brand-green-accent); }

a { color: inherit; text-decoration: none; transition: color var(--motion-state) var(--ease); }
img, svg, video, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
ul[role="list"], ol[role="list"] { list-style: none; }

:focus-visible { outline: 2px solid var(--brand-green-sage); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--brand-gold); color: var(--brand-green-deep); }

.skip-link { position: absolute; left: var(--space-md); top: -100px; z-index: 1000; padding: var(--space-sm) var(--space-md); background: var(--brand-green-deep); color: var(--brand-ivory); border-radius: var(--radius-sm); font-size: var(--text-sm); font-weight: 600; }
.skip-link:focus { top: var(--space-md); }

.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }

/* ---- Containers ---- */
.container { width: 100%; max-width: var(--container-max); margin-inline: auto; padding-inline: var(--gutter); }
.container-narrow { width: 100%; max-width: var(--container-narrow); margin-inline: auto; padding-inline: var(--gutter); }

/* ---- Eyebrows, section heads ---- */
.eyebrow {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--text-2xs);
  font-weight: 600;
  line-height: var(--leading-ui);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--brand-green-accent);
  margin-bottom: var(--space-sm);
}
@media (min-width: 768px) { .eyebrow { font-size: var(--text-xs); } }

.section-head { margin-bottom: var(--space-4xl); max-width: 56rem; }
.section-head h2 { margin-bottom: var(--space-md); }
@media (min-width: 768px) { .section-head h2 { margin-bottom: var(--space-xl); } }
.section-head p { max-width: var(--measure); font-size: var(--text-lg); color: var(--ink-secondary); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  min-height: 44px;
  font-family: var(--font-sans); font-size: var(--text-base); font-weight: 500; line-height: 1.2;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background-color var(--motion-state) var(--ease), color var(--motion-state) var(--ease), border-color var(--motion-state) var(--ease), transform var(--motion-move) var(--ease), box-shadow var(--motion-move) var(--ease);
}
.btn:active { transform: scale(var(--motion-press)); }
.btn svg { width: 16px; height: 16px; flex: none; }

.btn-primary { background: var(--brand-green-deep); border-color: var(--brand-green-deep); color: var(--brand-ivory); }
.btn-primary:hover { background: var(--brand-green-accent); border-color: var(--brand-green-accent); }

.btn-ghost { background: transparent; border-color: var(--rule-strong); color: var(--ink-primary); }
.btn-ghost:hover { background: var(--ink-primary); border-color: var(--ink-primary); color: var(--bg-white); }

.btn-quiet { padding-inline: var(--space-sm); color: var(--ink-secondary); }
.btn-quiet:hover { color: var(--brand-green-accent); }

.btn-gold { background: var(--brand-gold); border-color: var(--brand-gold); color: var(--brand-green-deep); font-weight: 600; }
.btn-gold:hover { background: #D2C494; border-color: #D2C494; }

.btn-on-dark { background: transparent; border-color: var(--rule-on-dark-strong); color: var(--ink-on-dark); }
.btn-on-dark:hover { background: var(--wash-on-dark-hover); border-color: var(--ink-on-dark); }

.btn-sm { min-height: 36px; padding: var(--space-xs) var(--space-md); font-size: var(--text-sm); }

/* ---- Tags ---- */
.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.tag {
  display: inline-flex; align-items: center;
  padding: 3px 10px;
  font-size: var(--text-xs); font-weight: 500; line-height: var(--leading-ui);
  color: var(--ink-muted);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-pill);
  background: var(--bg-white);
}
.tag-accent { color: var(--brand-green-accent); background: var(--brand-green-tint); border-color: transparent; }

/* ---- Scroll reveal: 500ms, 20px rise, eased entry, 60ms sibling stagger ---- */
.reveal {
  opacity: 0;
  transform: translateY(var(--motion-rise));
  transition: opacity var(--motion-enter) var(--ease-enter), transform var(--motion-enter) var(--ease-enter);
  transition-delay: var(--reveal-delay, 0s);
}
.reveal.is-visible { opacity: 1; transform: none; }
.stagger > .reveal:nth-child(1) { --reveal-delay: 0s; }
.stagger > .reveal:nth-child(2) { --reveal-delay: calc(var(--motion-stagger) * 1); }
.stagger > .reveal:nth-child(3) { --reveal-delay: calc(var(--motion-stagger) * 2); }
.stagger > .reveal:nth-child(4) { --reveal-delay: calc(var(--motion-stagger) * 3); }
.stagger > .reveal:nth-child(5) { --reveal-delay: calc(var(--motion-stagger) * 4); }
.stagger > .reveal:nth-child(6) { --reveal-delay: calc(var(--motion-stagger) * 5); }
.stagger > .reveal:nth-child(n+7) { --reveal-delay: calc(var(--motion-stagger) * 6); }

/* ---- Dialog primitives (case study, digital card, imprint) ---- */
.dialog {
  position: fixed; inset: 0; z-index: 200;
  display: grid; place-items: center;
  padding: var(--space-md);
  background: rgba(18, 21, 18, 0.62);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  opacity: 0; visibility: hidden;
  transition: opacity var(--motion-move) var(--ease), visibility 0s linear var(--motion-move);
}
.dialog.is-open { opacity: 1; visibility: visible; transition: opacity var(--motion-move) var(--ease), visibility 0s; }
.dialog-panel {
  position: relative;
  width: 100%; max-width: 760px; max-height: min(88vh, 900px);
  overflow-y: auto; overscroll-behavior: contain;
  background: var(--bg-white); color: var(--ink-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  box-shadow: var(--shadow-lightbox);
  transform: translateY(12px) scale(0.985);
  transition: transform var(--motion-move) var(--ease-enter);
}
.dialog.is-open .dialog-panel { transform: none; }
.dialog-panel--narrow { max-width: 440px; text-align: center; }
.dialog-panel--dark { background: var(--brand-green-deep); color: var(--brand-ivory); }
.dialog-close {
  position: absolute; top: var(--space-md); right: var(--space-md); z-index: 2;
  width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center;
  color: var(--ink-secondary); background: var(--bg-subtle);
  transition: background-color var(--motion-state) var(--ease), color var(--motion-state) var(--ease);
}
.dialog-close:hover { background: var(--ink-primary); color: var(--bg-white); }
.dialog-panel--dark .dialog-close { background: var(--wash-on-dark); color: var(--ink-on-dark); }
.dialog-panel--dark .dialog-close:hover { background: var(--wash-on-dark-hover); }
.dialog-close svg { width: 18px; height: 18px; }
@media (max-width: 767.98px) { .dialog-panel { padding: var(--space-xl); border-radius: var(--radius-lg); } }

/* ---- Reduced motion: everything stands still and is visible ---- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  .btn, .dialog, .dialog-panel { transition: none !important; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}

/* ---- Touch: on phones every link and control answers a 44px tap ---- */
@media (max-width: 767.98px) {
  .brand-mark { min-height: 44px; }
  .dialog-close { width: 44px; height: 44px; }
  .how-go, .product-link, .cv-download, .credential-verify { position: relative; }
  .how-go::after, .product-link::after, .cv-download::after, .credential-verify::after {
    content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 44px; transform: translateY(-50%);
  }
}