/* ============================================================
   Santronica Page-B — Minimalistic Apple-style Design
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Palette: graphite & silver. Every colour on the site derives from these twelve. */
  --dark-bg:        #0E1012;
  --dark-surface:   #171A1D;
  --dark-text:      #F1F3F5;
  --dark-muted:     #9AA1A9;
  --light-bg:       #F6F7F8;
  --light-surface:  #FFFFFF;
  --light-text:     #121417;
  --light-muted:    #5E656D;
  --accent:         #C9CFD6;
  --on-accent:      #0E1012;
  --accent-ink:     #2A2F36;
  --on-accent-ink:  #FFFFFF;

  /* Surfaces. Default sections sit on --bg with white cards; alternate sections flip that. */
  --bg:             var(--light-bg);
  --bg-alt:         var(--light-surface);
  --card:           var(--light-surface);
  --card-alt:       var(--light-bg);
  --bg-dark:        var(--dark-bg);
  --tile-dark:      var(--dark-surface);

  --text:           var(--light-text);
  --text-2:         var(--light-muted);
  --text-dark:      var(--dark-text);
  --text-dark-2:    var(--dark-muted);

  --hairline:             color-mix(in srgb, var(--light-text) 8%, transparent);
  --hairline-strong:      color-mix(in srgb, var(--light-text) 16%, transparent);
  --hairline-dark:        color-mix(in srgb, var(--dark-text) 10%, transparent);
  --hairline-dark-strong: color-mix(in srgb, var(--dark-text) 22%, transparent);
  --field-border:         color-mix(in srgb, var(--light-text) 26%, transparent);
  --field-border-hover:   color-mix(in srgb, var(--light-text) 42%, transparent);

  --shadow-soft: 0 1px 2px color-mix(in srgb, var(--light-text) 4%, transparent),
                 0 18px 40px -22px color-mix(in srgb, var(--light-text) 22%, transparent);
  --shadow-dark: 0 1px 2px color-mix(in srgb, var(--dark-bg) 60%, transparent),
                 0 28px 60px -28px color-mix(in srgb, var(--dark-bg) 92%, transparent);

  /* Interactive colour: graphite ink on light ground, silver on dark ground. */
  --action:        var(--accent-ink);
  --on-action:     var(--on-accent-ink);
  --action-hover:  var(--light-text);

  --radius-sm:     20px;
  --radius-lg:     28px;

  --nav-h:         52px;
  --container:     980px;
}

/* Dark grounds swap the interactive pair to silver. */
.hero,
.section-dark,
.footer,
.nav.nav--dark {
  --action:        var(--accent);
  --on-action:     var(--on-accent);
  --action-hover:  var(--dark-text);
}

@media (max-width: 768px) {
  :root {
    --radius-lg: 20px;
  }
}

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

html {
  background: var(--bg-dark);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(44px, 6vw, 80px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

h2 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.07;
  margin-bottom: 2rem;
  text-wrap: balance;
}

h3 {
  font-size: clamp(18px, 2.5vw, 24px);
  letter-spacing: -0.01em;
}

p {
  font-size: 17px;
  line-height: 1.47;
}

/* ---------- Container & Utilities ---------- */
.container {
  width: min(var(--container), 100% - 44px);
  margin-inline: auto;
  /* Content paints above the floating PCB; section backgrounds paint below it. */
  position: relative;
  z-index: 1;
}

/* Sections stay non-positioned so their flat backgrounds render beneath the fixed .pcb-stage.
   Spacing follows the screen height too, so short laptop screens don't get half-empty views. */
.section {
  padding: clamp(64px, min(9vw, 12vh), 120px) 0;
  padding: clamp(64px, min(9vw, 12svh), 120px) 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-dark {
  background: var(--bg-dark);
  color: var(--text-dark);
}

.section-dark .eyebrow {
  color: var(--accent);
}

.section-dark h2,
.section-dark h3 {
  color: var(--text-dark);
}

.section-dark p {
  color: var(--text-dark-2);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: color-mix(in srgb, var(--light-bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hairline);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.nav.nav--dark {
  background: color-mix(in srgb, var(--dark-bg) 66%, transparent);
  border-bottom-color: var(--hairline-dark);
  color: var(--text-dark);
}

.nav.nav--dark .nav-links a:not(.btn) {
  color: var(--text-dark-2);
}

.nav.nav--dark .nav-links a:not(.btn):hover,
.nav.nav--dark .nav-links a:not(.btn).active {
  color: var(--text-dark);
}

.nav.nav--dark .nav-links a:not(.btn)::after {
  background: var(--accent);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 22px;
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-weight: 600;
  letter-spacing: 0.1em;
  font-size: 13px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a:not(.btn) {
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 4px 0;
}

.nav-links a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--action);
  transition: right 0.2s ease;
}

.nav-links a:not(.btn):hover,
.nav-links a:not(.btn).active {
  color: var(--text);
}

.nav-links a:not(.btn):hover::after,
.nav-links a:not(.btn).active::after {
  right: 0;
}

.nav-toggle {
  display: none;
}

.nav-cta {
  margin-left: 12px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-weight: 500;
  font-size: 14px;
  padding: 10px 20px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  font-family: inherit;
}

.btn:active {
  transform: scale(0.97);
}

.btn-accent {
  background: var(--action);
  color: var(--on-action);
}

.btn-accent:hover {
  background: var(--action-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-dark);
  border: 1px solid var(--hairline-dark-strong);
}

.btn-ghost:hover {
  border-color: var(--text-dark);
  background: color-mix(in srgb, var(--dark-text) 5%, transparent);
}

.btn-small {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ---------- Typography Helpers ---------- */
.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 12px;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 1px;
  margin-right: 10px;
  vertical-align: middle;
  background: currentColor;
  opacity: 0.55;
}

.section-lead {
  max-width: 640px;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.53;
  margin-bottom: 2rem;
}

.section-dark .section-lead {
  color: var(--text-dark-2);
}

/* ---------- Badges & Tags ---------- */
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  color: var(--text);
  background: var(--card);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.hero .badge,
.section-dark .badge {
  border-color: var(--hairline-dark);
  color: var(--text-dark);
  background: var(--tile-dark);
}

/* Ex / hazardous-area emphasis: a solid pill in the interactive colour. */
.badge.badge-ex {
  border-color: var(--action);
  background: var(--action);
  color: var(--on-action);
}

.tag-ex {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  margin-left: 8px;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 6px;
  vertical-align: 0.15em;
  background: var(--action);
  color: var(--on-action);
}

/* ---------- Chip Tags ---------- */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.chip-tag {
  display: inline-block;
  font-size: 14px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--hairline);
}

.chip-tag.chip-ex {
  background: transparent;
  color: var(--action);
  border-color: var(--action);
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent-ink);
  color: var(--on-accent-ink);
  padding: 12px 20px;
  z-index: 200;
  font-weight: 600;
  font-size: 14px;
}

.skip-link:focus {
  left: 0;
}

/* ---------- Forms ---------- */
.field {
  margin-bottom: 20px;
}

label {
  display: block;
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text);
}

input[type="text"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--field-border);
  border-radius: 10px;
  font-family: inherit;
  font-size: 16px;
  background: var(--light-bg);
  color: var(--text);
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

input:hover,
textarea:hover,
select:hover {
  border-color: var(--field-border-hover);
}

::placeholder {
  color: var(--text-2);
  opacity: 0.8;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  background: var(--light-surface);
  border-color: var(--action);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--action) 14%, transparent);
}

textarea {
  resize: vertical;
  line-height: 1.5;
}

select {
  cursor: pointer;
}

.optional {
  font-weight: 400;
  color: var(--text-2);
}

.honey-field {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

.form-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-2);
  min-height: 20px;
}

/* ---------- PCB Stage & Slots ---------- */
.pcb-stage {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.pcb-live .pcb-stage {
  opacity: 1;
}

.pcb-stage canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Debug mode */
html.pcb-debug .pcb-slot {
  outline: 1px dashed magenta;
}

html.pcb-debug .pcb-slot::after {
  content: attr(data-pcb-slot);
  position: absolute;
  bottom: 4px;
  left: 4px;
  font-size: 10px;
  color: magenta;
  font-family: monospace;
  background: white;
  padding: 2px 4px;
  border-radius: 2px;
}

/* ---------- Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--action);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .container {
    width: 100%;
    padding: 0 22px;
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
  }

  .nav-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--text);
    border-radius: 1px;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .nav.nav--dark .nav-toggle span {
    background: var(--text-dark);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    /* The nav's backdrop-filter makes it the containing block for this fixed panel,
       so "bottom: 0" would end it at the nav's own bottom edge. Size it explicitly. */
    height: calc(100vh - var(--nav-h));
    height: calc(100dvh - var(--nav-h));
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    padding: 12px 22px 32px;
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

  .nav.nav--dark .nav-links {
    background: var(--bg-dark);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a:not(.btn) {
    font-size: 17px;
    padding: 16px 0;
    border-bottom: 1px solid var(--hairline);
  }

  .nav-links a:not(.btn)::after {
    display: none;
  }

  .nav.nav--dark .nav-links a:not(.btn) {
    border-bottom-color: var(--hairline-dark);
  }

  .nav-links .nav-cta {
    margin-left: 0;
    margin-top: 24px;
    display: block;
    text-align: center;
    font-size: 15px;
    padding: 14px 20px;
  }
}