/* ===========================================================================
   BASE — reset, typography, chrome, buttons, motion primitives.
   =========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.035em;
  margin: 0;
  text-wrap: balance;
}

h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-3); }
h4 { font-size: var(--step-1); letter-spacing: -0.02em; }

a { color: inherit; }

.mono {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

.eyebrow {
  color: var(--ink-2);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* --- accessibility ------------------------------------------------------ */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: 0.8rem 1.2rem;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- scroll progress ---------------------------------------------------- */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 60;
  pointer-events: none;
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: background var(--speed) var(--ease);
}

/* --- header ------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
  padding: 0.85rem var(--gutter);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.15rem;
  text-decoration: none;
}
.wordmark-dot {
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: var(--accent);
  transition: background var(--speed) var(--ease);
}

.site-nav { margin-left: auto; }
.nav-list { display: flex; gap: 1.4rem; }
.nav-list a {
  text-decoration: none;
  color: var(--ink-2);
  transition: color 200ms var(--ease);
}
.nav-list a:hover { color: var(--ink); }
.nav-toggle { display: none; }

.theme-toggle {
  width: 2.3rem;
  height: 2.3rem;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  color: var(--ink);
}
.theme-toggle:hover { border-color: var(--line-strong); }
.theme-icon {
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: inset -0.32rem -0.32rem 0 0 var(--paper);
  transition: box-shadow 300ms var(--ease), background 300ms var(--ease);
}
:root[data-theme="dark"] .theme-icon {
  box-shadow: inset 0 0 0 0 var(--paper);
  background: var(--accent);
}

/* --- buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.9rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform 260ms var(--ease), background 260ms var(--ease),
    color 260ms var(--ease), border-color 260ms var(--ease);
}
.btn:hover { transform: translateY(-2px); }

.btn-solid {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn-solid:hover { filter: saturate(1.15); }

.btn-line {
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-line:hover { border-color: var(--accent); color: var(--accent-text); }

/* --- TODO flags: impossible to ship by accident ------------------------- */
.todo {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.4;
  text-transform: none;
  letter-spacing: 0;
  color: #7a4b00;
  background: repeating-linear-gradient(-45deg, #ffe9b0 0 8px, #ffdf90 8px 16px);
  border: 1px dashed #b07a12;
  border-radius: 6px;
  padding: 0.15em 0.5em;
}
:root[data-theme="dark"] .todo {
  color: #ffe1a8;
  background: repeating-linear-gradient(-45deg, #40320f 0 8px, #4d3c11 8px 16px);
  border-color: #a9801f;
}

.todo-banner {
  position: fixed;
  left: 50%;
  bottom: 1.1rem;
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 0.8rem 0.7rem 1.1rem;
  border-radius: 999px;
  background: #1b1a17;
  color: #ffe1a8;
  border: 1px solid #a9801f;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  box-shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.6);
}
.todo-banner button {
  border: 0;
  border-radius: 999px;
  background: #ffe1a8;
  color: #1b1a17;
  font: inherit;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

/* --- reveal motion ------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--speed) var(--ease), transform var(--speed) var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

.stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 560ms var(--ease), transform 560ms var(--ease);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.stagger.is-visible > * { opacity: 1; transform: none; }

/* --- footer ------------------------------------------------------------- */
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 2.5rem var(--gutter) 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-2);
}

.noscript-note { padding: 3rem var(--gutter); }

/* --- mobile ------------------------------------------------------------- */
@media (max-width: 780px) {
  .nav-toggle {
    display: inline-block;
    border: 1px solid var(--line-strong);
    background: transparent;
    color: var(--ink);
    border-radius: 999px;
    padding: 0.45rem 0.9rem;
    font: inherit;
    font-family: var(--font-mono);
    text-transform: uppercase;
    cursor: pointer;
  }
  .nav-list {
    position: absolute;
    right: var(--gutter);
    top: calc(100% + 0.5rem);
    flex-direction: column;
    gap: 0.9rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.1rem 1.4rem;
    box-shadow: var(--shadow-lift);
    display: none;
  }
  .nav-list.is-open { display: flex; }
}

/* --- respect the user --------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal, .stagger > * { opacity: 1 !important; transform: none !important; }
}

/* --- print: turns the page into a clean one-pager ----------------------- */
@media print {
  .site-header, .scroll-progress, .strip, .hero-actions,
  .theme-toggle, .todo-banner, .skip-link { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .reveal, .stagger > * { opacity: 1 !important; transform: none !important; }
  .section { padding: 1.2rem 0 !important; page-break-inside: avoid; }
  .product { border: 1px solid #ccc !important; background: #fff !important; }
}