/* ==========================================================================
   Chuk Yip Company — Base
   Modern minimal reset, typography, focus, reduced-motion, skip link,
   shared layout primitives (.container, .flow, .visually-hidden).
   Requires tokens.css loaded first.
   ========================================================================== */

/* --- Modern minimal reset --- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

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

/* Smooth scrolling only when the user has not asked for reduced motion. */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img {
  display: block;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding: 0;
}

summary {
  cursor: pointer;
}

/* --- Typography --- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--leading-heading);
  color: var(--color-text);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  letter-spacing: -0.01em;
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: -0.005em;
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

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

a {
  color: var(--color-accent-strong);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--color-text);
}

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

/* --- Focus: visible ring via :focus-visible; outlines are never removed --- */
:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
}

/* --- Skip link (first focusable element on every page) --- */
.skip-link {
  position: absolute;
  top: 0;
  left: var(--space-2);
  z-index: var(--z-skip-link);
  padding: var(--space-1) var(--space-2);
  background: var(--color-text);
  color: var(--color-bg);
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transform: translateY(-120%);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* --- Shared layout primitives --- */
.container {
  width: min(calc(100% - 2 * var(--gutter)), var(--max-width));
  margin-inline: auto;
}

/* Vertical rhythm for stacked copy blocks. */
.flow > * + * {
  margin-block-start: 1em;
}

.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;
}

/* --- Motion: transitions exist ONLY inside this gate --- */
@media (prefers-reduced-motion: no-preference) {
  a {
    transition: color var(--duration-fast) var(--ease-standard);
  }

  .skip-link {
    transition: transform var(--duration-fast) var(--ease-standard);
  }

  .btn {
    transition: background-color var(--duration-fast) var(--ease-standard),
      color var(--duration-fast) var(--ease-standard),
      border-color var(--duration-fast) var(--ease-standard);
  }

  .nav__link,
  .submenu__link {
    transition: background-color var(--duration-fast) var(--ease-standard),
      color var(--duration-fast) var(--ease-standard);
  }

  .nav__chevron,
  .faq-item summary::after,
  .nav-toggle__icon span {
    transition: transform var(--duration-fast) var(--ease-standard),
      opacity var(--duration-fast) var(--ease-standard);
  }
}

/* --- Print: prototypes are reviewed on screen, but never waste paper --- */
@media print {
  .sticky-cta,
  .nav-toggle {
    display: none !important;
  }
}