/* ==========================================================================
   HKEMS-STMO · Base layer
   Reset, document canvas, layout primitives, typography, utilities.
   ========================================================================== */

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

html {
  /* 106.25% of the browser default: every rem-based size below scales with it */
  font-size: 106.25%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--app-bar-height) + 24px);
}

body {
  margin: 0;
  min-height: 100dvh;
  font: var(--font-body-md);
  color: var(--md-on-surface);
  background-color: var(--body-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ---------- elements ---------- */
[data-icon] {
  display: inline-flex;
  align-items: center;
  flex: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  color: var(--md-on-surface);
}

p,
ul,
ol,
dl,
figure,
blockquote {
  margin: 0;
}

ul[class],
ol[class] {
  padding: 0;
  list-style: none;
}

a {
  color: var(--md-primary);
  text-decoration: none;
  transition: color var(--dur-short3) var(--ease-standard);
}

a:hover {
  color: color-mix(in srgb, var(--md-primary) 78%, var(--md-on-surface));
}

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

img,
video {
  height: auto;
}

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

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

hr {
  border: 0;
  border-top: 1px solid var(--md-outline-variant);
  margin: var(--space-6) 0;
}

code,
kbd,
pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

kbd {
  padding: 2px 6px;
  border-radius: var(--shape-xs);
  border: 1px solid var(--md-outline-variant);
  background: var(--md-surface-container-high);
  font-size: 0.75em;
}

::selection {
  background: color-mix(in srgb, var(--md-primary) 30%, transparent);
  color: var(--md-on-surface);
}

:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 3px;
  border-radius: var(--shape-xs);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--md-outline) 45%, transparent);
  border: 2px solid transparent;
  background-clip: content-box;
  border-radius: var(--shape-full);
}

::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--md-outline) 70%, transparent);
  background-clip: content-box;
}

/* ---------- typography helpers ---------- */
.display-lg {
  font: var(--font-display-lg);
}
.display-md {
  font: var(--font-display-md);
}
.display-sm {
  font: var(--font-display-sm);
}
.headline-lg {
  font: var(--font-headline-lg);
  letter-spacing: var(--tracking-tight);
}
.headline-md {
  font: var(--font-headline-md);
}
.headline-sm {
  font: var(--font-headline-sm);
}
.title-lg {
  font: var(--font-title-lg);
}
.title-md {
  font: var(--font-title-md);
}
.title-sm {
  font: var(--font-title-sm);
}
.body-lg {
  font: var(--font-body-lg);
}
.body-md {
  font: var(--font-body-md);
}
.body-sm {
  font: var(--font-body-sm);
}
.label-lg {
  font: var(--font-label-lg);
}
.label-md {
  font: var(--font-label-md);
}
.label-sm {
  font: var(--font-label-sm);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.text-muted {
  color: var(--md-on-surface-variant);
}
.text-primary {
  color: var(--md-primary);
}
.text-tertiary {
  color: var(--md-tertiary);
}
.text-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

.container--narrow {
  width: min(100% - var(--container-pad) * 2, 860px);
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: clamp(56px, 8vw, 104px);
}

/* inner pages sit below the fixed app bar */
.page {
  padding-top: calc(var(--app-bar-height) + 10px);
}

.section--tight {
  padding-block: clamp(32px, 5vw, 56px);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: clamp(24px, 4vw, 44px);
}

.section-head__text {
  max-width: 62ch;
}

.section-title {
  font: var(--font-headline-md);
  letter-spacing: var(--tracking-tight);
}

.section-lead {
  margin-top: var(--space-2);
  font: var(--font-body-md);
  color: var(--md-on-surface-variant);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.stack--sm {
  gap: var(--space-2);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 960px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

.divider {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--md-outline-variant);
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 50%;
  translate: -50% 0;
  z-index: 100;
  padding: 10px 20px;
  border-radius: var(--shape-full);
  background: var(--md-primary);
  color: var(--md-on-primary);
  font: var(--font-label-lg);
  transition: top var(--dur-short3) var(--ease-standard);
}

.skip-link:focus-visible {
  top: 12px;
  color: var(--md-on-primary);
}

/* ---------- scroll reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-long1) var(--ease-emphasized-decel),
    transform var(--dur-long1) var(--ease-emphasized-decel);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

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

[hidden] {
  display: none !important;
}

.noscript-note {
  position: relative;
  z-index: 1;
  display: flex;
  gap: var(--space-3);
  align-items: center;
  justify-content: center;
  margin: calc(var(--app-bar-height) + 16px) auto 0;
  padding: 12px 20px;
  width: min(100% - 32px, 760px);
  border-radius: var(--shape-md);
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  font: var(--font-body-sm);
}

@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;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

@media print {
  body::before,
  body::after,
  .top-app-bar,
  .site-footer,
  .fab-back-to-top,
  .scroll-progress {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }
}