/* ==========================================================================
   AuroraOSP — Material 3 Expressive design system
   Tokens, shape scale, expressive motion, and components.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Color tokens — dark-first "deep aurora" scheme
   -------------------------------------------------------------------------- */
:root {
  color-scheme: light dark;

  /* Light scheme (default) */
  --md-primary: #00687a;
  --md-on-primary: #ffffff;
  --md-primary-container: #a6eefc;
  --md-on-primary-container: #001f26;

  --md-secondary: #006b54;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #90f7d3;
  --md-on-secondary-container: #002018;

  --md-tertiary: #4f5b92;
  --md-on-tertiary: #ffffff;
  --md-tertiary-container: #dee0ff;
  --md-on-tertiary-container: #060e43;

  --md-error: #ba1a1a;
  --md-on-error: #ffffff;
  --md-error-container: #ffdad6;
  --md-on-error-container: #410002;

  --md-surface: #f5fafb;
  --md-on-surface: #171d1e;
  --md-surface-dim: #d5dbdc;
  --md-surface-bright: #f5fafb;
  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #eff5f6;
  --md-surface-container: #e9eff0;
  --md-surface-container-high: #e3e9eb;
  --md-surface-container-highest: #dee4e5;
  --md-on-surface-variant: #3f484a;

  --md-outline: #6f797a;
  --md-outline-variant: #bfc8ca;

  --md-inverse-surface: #2b3133;
  --md-inverse-on-surface: #ecf2f3;
  --md-inverse-primary: #55d6ec;

  --md-scrim: 0 0 0;

  /* Aurora accent ramp — used for gradients and glow, not for text */
  --aurora-1: #00e5ff;
  --aurora-2: #22d3a8;
  --aurora-3: #6f7cff;
  --aurora-4: #b07cff;

  --md-shadow-1: 0 1px 2px rgb(0 0 0 / .18), 0 1px 3px 1px rgb(0 0 0 / .10);
  --md-shadow-2: 0 1px 2px rgb(0 0 0 / .18), 0 2px 6px 2px rgb(0 0 0 / .10);
  --md-shadow-3: 0 4px 8px 3px rgb(0 0 0 / .10), 0 1px 3px rgb(0 0 0 / .18);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --md-primary: #55d6ec;
    --md-on-primary: #00363f;
    --md-primary-container: #004e5b;
    --md-on-primary-container: #a6eefc;
    --md-secondary: #74dab8;
    --md-on-secondary: #00382a;
    --md-secondary-container: #00513f;
    --md-on-secondary-container: #90f7d3;
    --md-tertiary: #bcc3ff;
    --md-on-tertiary: #1f2b60;
    --md-tertiary-container: #374278;
    --md-on-tertiary-container: #dee0ff;
    --md-error: #ffb4ab;
    --md-on-error: #690005;
    --md-error-container: #93000a;
    --md-on-error-container: #ffdad6;
    --md-surface: #0c1416;
    --md-on-surface: #dde4e5;
    --md-surface-dim: #0c1416;
    --md-surface-bright: #323a3b;
    --md-surface-container-lowest: #060e10;
    --md-surface-container-low: #141c1e;
    --md-surface-container: #182022;
    --md-surface-container-high: #222b2c;
    --md-surface-container-highest: #2d3537;
    --md-on-surface-variant: #bfc8ca;
    --md-outline: #899294;
    --md-outline-variant: #3f484a;
    --md-inverse-surface: #dde4e5;
    --md-inverse-on-surface: #2b3133;
    --md-inverse-primary: #00687a;
    --md-shadow-1: 0 1px 2px rgb(0 0 0 / .40), 0 1px 3px 1px rgb(0 0 0 / .22);
    --md-shadow-2: 0 1px 2px rgb(0 0 0 / .40), 0 2px 6px 2px rgb(0 0 0 / .22);
    --md-shadow-3: 0 4px 8px 3px rgb(0 0 0 / .22), 0 1px 3px rgb(0 0 0 / .40);
  }
}

:root[data-theme="dark"] {
  --md-primary: #55d6ec;
  --md-on-primary: #00363f;
  --md-primary-container: #004e5b;
  --md-on-primary-container: #a6eefc;

  --md-secondary: #74dab8;
  --md-on-secondary: #00382a;
  --md-secondary-container: #00513f;
  --md-on-secondary-container: #90f7d3;

  --md-tertiary: #bcc3ff;
  --md-on-tertiary: #1f2b60;
  --md-tertiary-container: #374278;
  --md-on-tertiary-container: #dee0ff;

  --md-error: #ffb4ab;
  --md-on-error: #690005;
  --md-error-container: #93000a;
  --md-on-error-container: #ffdad6;

  --md-surface: #0c1416;
  --md-on-surface: #dde4e5;
  --md-surface-dim: #0c1416;
  --md-surface-bright: #323a3b;
  --md-surface-container-lowest: #060e10;
  --md-surface-container-low: #141c1e;
  --md-surface-container: #182022;
  --md-surface-container-high: #222b2c;
  --md-surface-container-highest: #2d3537;
  --md-on-surface-variant: #bfc8ca;

  --md-outline: #899294;
  --md-outline-variant: #3f484a;

  --md-inverse-surface: #dde4e5;
  --md-inverse-on-surface: #2b3133;
  --md-inverse-primary: #00687a;

  --md-shadow-1: 0 1px 2px rgb(0 0 0 / .40), 0 1px 3px 1px rgb(0 0 0 / .22);
  --md-shadow-2: 0 1px 2px rgb(0 0 0 / .40), 0 2px 6px 2px rgb(0 0 0 / .22);
  --md-shadow-3: 0 4px 8px 3px rgb(0 0 0 / .22), 0 1px 3px rgb(0 0 0 / .40);
}

/* --------------------------------------------------------------------------
   2. Shape scale — M3 Expressive adds the "increased" and XXL steps
   -------------------------------------------------------------------------- */
:root {
  --shape-xs: 4px;
  --shape-sm: 8px;
  --shape-md: 12px;
  --shape-lg: 16px;
  --shape-lg-inc: 20px;
  --shape-xl: 28px;
  --shape-xl-inc: 32px;
  --shape-xxl: 48px;
  --shape-full: 999px;
}

/* --------------------------------------------------------------------------
   3. Motion — expressive spatial springs
   -------------------------------------------------------------------------- */
:root {
  --ease-standard: cubic-bezier(.2, 0, 0, 1);
  --ease-emphasized: cubic-bezier(.2, 0, 0, 1);
  --ease-spatial-fast: cubic-bezier(.42, 1.67, .21, .90);
  --ease-spatial: cubic-bezier(.38, 1.21, .22, 1);
  --ease-effects: cubic-bezier(.34, .80, .34, 1);
  --dur-short: 150ms;
  --dur-medium: 300ms;
  --dur-long: 500ms;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------------------
   4. Typography — emphasized type scale
   -------------------------------------------------------------------------- */
:root {
  --font-brand: "Space Grotesk", "Google Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-plain: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.display-lg, .display-md, .display-sm,
.headline-lg, .headline-md, .headline-sm {
  font-family: var(--font-brand);
  font-weight: 600;
  letter-spacing: -.02em;
  line-height: 1.12;
  text-wrap: balance;
}

.display-lg { font-size: clamp(2.75rem, 7vw, 4.5rem); letter-spacing: -.035em; }
.display-md { font-size: clamp(2.25rem, 5.5vw, 3.5rem); letter-spacing: -.03em; }
.display-sm { font-size: clamp(2rem, 4.5vw, 2.75rem); }
.headline-lg { font-size: clamp(1.75rem, 3.5vw, 2.25rem); }
.headline-md { font-size: clamp(1.5rem, 3vw, 1.875rem); }
.headline-sm { font-size: 1.375rem; line-height: 1.25; }

.title-lg { font-family: var(--font-brand); font-size: 1.1875rem; font-weight: 600; line-height: 1.35; letter-spacing: -.01em; }
.title-md { font-family: var(--font-plain); font-size: 1rem; font-weight: 600; line-height: 1.4; letter-spacing: .0094em; }
.title-sm { font-family: var(--font-plain); font-size: .875rem; font-weight: 600; line-height: 1.43; letter-spacing: .0071em; }

.body-lg { font-size: 1.0625rem; line-height: 1.62; letter-spacing: .0031em; }
.body-md { font-size: .9375rem; line-height: 1.6; letter-spacing: .0156em; }
.body-sm { font-size: .8125rem; line-height: 1.55; letter-spacing: .025em; }

.label-lg { font-size: .875rem; font-weight: 600; letter-spacing: .0071em; }
.label-md { font-size: .75rem; font-weight: 600; letter-spacing: .0417em; }
.label-sm { font-size: .6875rem; font-weight: 600; letter-spacing: .0455em; }

.overline, .section__head .overline {
  font-family: var(--font-plain);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--md-primary);
}

/* --------------------------------------------------------------------------
   5. Base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

/* SVG defaults to display:inline, which some UA sheets apply after [hidden];
   make the attribute authoritative so the theme toggle shows one icon. */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  margin: 0;
  font-family: var(--font-plain);
  font-size: 1rem;
  line-height: 1.6;
  background: var(--md-surface);
  color: var(--md-on-surface);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 { margin: 0; }
p { margin: 0; }
a { color: inherit; }
img, svg { max-width: 100%; }
ul, ol { margin: 0; padding: 0; }

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

.wrap {
  width: min(1200px, 100% - 3rem);
  margin-inline: auto;
}
@media (max-width: 600px) { .wrap { width: min(1200px, 100% - 2rem); } }

.stack > * + * { margin-top: var(--gap, 1rem); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}

/* --------------------------------------------------------------------------
   6. Buttons — filled, tonal, outlined, text + expressive shape morph
   -------------------------------------------------------------------------- */
.btn {
  --btn-bg: var(--md-primary);
  --btn-fg: var(--md-on-primary);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  min-height: 3rem;
  padding: 0 1.75rem;
  border: 0;
  border-radius: var(--shape-full);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-plain);
  font-size: .9375rem;
  font-weight: 650;
  letter-spacing: .01em;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  isolation: isolate;
  transition:
    border-radius var(--dur-medium) var(--ease-spatial-fast),
    transform var(--dur-medium) var(--ease-spatial-fast),
    box-shadow var(--dur-short) var(--ease-standard),
    background-color var(--dur-short) var(--ease-standard);
}
/* the expressive bit: pill relaxes into a squircle while pressed */
.btn:hover { border-radius: var(--shape-lg-inc); }
.btn:active { border-radius: var(--shape-md); transform: scale(.96); }

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  z-index: -1;
  transition: opacity var(--dur-short) var(--ease-standard);
}
.btn:hover::after { opacity: .08; }
.btn:active::after { opacity: .12; }

.btn--lg { min-height: 3.5rem; padding: 0 2.25rem; font-size: 1rem; }
.btn--sm { min-height: 2.5rem; padding: 0 1.25rem; font-size: .875rem; }

.btn--filled { box-shadow: var(--md-shadow-1); }
.btn--filled:hover { box-shadow: var(--md-shadow-2); }

.btn--tonal {
  --btn-bg: var(--md-secondary-container);
  --btn-fg: var(--md-on-secondary-container);
}

.btn--outlined {
  --btn-bg: transparent;
  --btn-fg: var(--md-primary);
  box-shadow: inset 0 0 0 1px var(--md-outline-variant);
}
.btn--outlined:hover { box-shadow: inset 0 0 0 1px var(--md-primary); }

.btn--text {
  --btn-bg: transparent;
  --btn-fg: var(--md-primary);
  padding: 0 1rem;
}

.btn .icon { width: 1.25em; height: 1.25em; flex: none; }

/* Button group — segmented, expressive squeeze on neighbours */
.btn-group {
  display: inline-flex;
  gap: 3px;
  padding: 3px;
  background: var(--md-surface-container);
  border-radius: var(--shape-full);
}
.btn-group .seg {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--md-on-surface-variant);
  font-family: inherit;
  font-size: .875rem;
  font-weight: 650;
  padding: .625rem 1.25rem;
  border-radius: var(--shape-full);
  cursor: pointer;
  transition:
    background-color var(--dur-short) var(--ease-standard),
    color var(--dur-short) var(--ease-standard),
    border-radius var(--dur-medium) var(--ease-spatial-fast);
}
.btn-group .seg:hover { background: color-mix(in oklab, var(--md-on-surface) 8%, transparent); }
.btn-group .seg[aria-selected="true"] {
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-radius: var(--shape-lg);
}

/* --------------------------------------------------------------------------
   7. Cards
   -------------------------------------------------------------------------- */
.card {
  position: relative;
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-xl);
  padding: 1.75rem;
  transition:
    transform var(--dur-medium) var(--ease-spatial),
    border-radius var(--dur-medium) var(--ease-spatial),
    border-color var(--dur-short) var(--ease-standard),
    background-color var(--dur-short) var(--ease-standard);
}
.card--interactive { cursor: pointer; }
.card--interactive:hover {
  transform: translateY(-4px);
  border-radius: var(--shape-xl-inc);
  border-color: color-mix(in oklab, var(--md-primary) 45%, var(--md-outline-variant));
  background: var(--md-surface-container);
}
.card--filled { background: var(--md-surface-container); border-color: transparent; }

/* --------------------------------------------------------------------------
   8. Chips
   -------------------------------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem .875rem;
  border-radius: var(--shape-sm);
  border: 1px solid var(--md-outline-variant);
  background: transparent;
  color: var(--md-on-surface-variant);
  font-size: .8125rem;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
}
.chip--accent {
  border-color: transparent;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}
.chip--tertiary {
  border-color: transparent;
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
}
.chip--secondary {
  border-color: transparent;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}
.chip-row { display: flex; flex-wrap: wrap; gap: .5rem; }

/* Filter chips (interactive) */
.chip--filter { cursor: pointer; font-family: inherit; border-radius: var(--shape-sm); transition: all var(--dur-short) var(--ease-standard); }
.chip--filter:hover { background: color-mix(in oklab, var(--md-on-surface) 8%, transparent); }
.chip--filter[aria-pressed="true"] {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-color: transparent;
}

/* --------------------------------------------------------------------------
   9. Wavy progress indicator — an M3 Expressive signature
   -------------------------------------------------------------------------- */
.wavy-rule {
  display: block;
  width: 100%;
  height: 14px;
  color: var(--md-primary);
  opacity: .55;
}
.wavy-rule path {
  stroke: currentColor;
  stroke-width: 3;
  stroke-linecap: round;
  fill: none;
}

/* --------------------------------------------------------------------------
   10. Top app bar + navigation
   -------------------------------------------------------------------------- */
.appbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--md-surface) 78%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-medium) var(--ease-standard),
              background-color var(--dur-medium) var(--ease-standard);
}
.appbar[data-scrolled="true"] {
  border-bottom-color: var(--md-outline-variant);
  background: color-mix(in oklab, var(--md-surface-container-low) 88%, transparent);
}
.appbar__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-brand);
  font-size: 1.1875rem;
  font-weight: 700;
  letter-spacing: -.02em;
  text-decoration: none;
  color: var(--md-on-surface);
  margin-right: auto;
}
.brand__mark {
  width: 36px;
  height: 36px;
  flex: none;
  object-fit: contain;
  /* the mark's band separators are transparent, so it reads on either theme */
}
.brand em { font-style: normal; color: var(--md-primary); }

.nav { display: flex; align-items: center; gap: .25rem; }
.nav a {
  position: relative;
  padding: .625rem 1rem;
  border-radius: var(--shape-full);
  font-size: .9375rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  transition: color var(--dur-short) var(--ease-standard),
              background-color var(--dur-short) var(--ease-standard),
              border-radius var(--dur-medium) var(--ease-spatial-fast);
}
.nav a:hover {
  color: var(--md-on-surface);
  background: color-mix(in oklab, var(--md-on-surface) 8%, transparent);
  border-radius: var(--shape-md);
}
.nav a[aria-current="page"] {
  color: var(--md-on-secondary-container);
  background: var(--md-secondary-container);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 44px; height: 44px;
  flex: none;
  border: 0;
  border-radius: var(--shape-full);
  background: transparent;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  transition: background-color var(--dur-short) var(--ease-standard),
              border-radius var(--dur-medium) var(--ease-spatial-fast),
              color var(--dur-short) var(--ease-standard);
}
.icon-btn:hover {
  background: color-mix(in oklab, var(--md-on-surface) 10%, transparent);
  color: var(--md-on-surface);
  border-radius: var(--shape-md);
}
.icon-btn svg { width: 22px; height: 22px; }

.nav-toggle { display: none; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-grid; }
  .nav {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: .25rem;
    padding: 1rem 1.5rem 1.5rem;
    background: var(--md-surface-container-low);
    border-bottom: 1px solid var(--md-outline-variant);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-medium) var(--ease-standard),
                transform var(--dur-medium) var(--ease-spatial);
  }
  .nav[data-open="true"] { opacity: 1; transform: none; pointer-events: auto; }
  .nav a { padding: .875rem 1rem; }
  .appbar__cta { display: none; }
}

/* --------------------------------------------------------------------------
   11. Sections & footer
   -------------------------------------------------------------------------- */
.section { padding: clamp(4rem, 9vw, 7.5rem) 0; }
.section--tight { padding: clamp(3rem, 6vw, 5rem) 0; }
.section__head { max-width: 58ch; margin-bottom: 3rem; }
.section__head > p + p,
.section__head > .overline + h2 + p { margin-top: 1rem; }
.section__head > p:not(.overline) { color: var(--md-on-surface-variant); }
.section__head > h2 { margin-top: .625rem; }

.footer {
  border-top: 1px solid var(--md-outline-variant);
  background: var(--md-surface-container-lowest);
  padding: 4rem 0 2.5rem;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 2.5rem;
}
@media (max-width: 860px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer__grid { grid-template-columns: 1fr; } }
.footer h4 { font-size: .8125rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--md-on-surface-variant); margin-bottom: 1rem; }
.footer ul { list-style: none; display: grid; gap: .625rem; }
.footer a { color: var(--md-on-surface-variant); text-decoration: none; font-size: .9375rem; transition: color var(--dur-short) var(--ease-standard); }
.footer a:hover { color: var(--md-primary); }
.footer__base {
  margin-top: 3rem; padding-top: 1.75rem;
  border-top: 1px solid var(--md-outline-variant);
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between;
  color: var(--md-on-surface-variant); font-size: .8125rem;
}

/* --------------------------------------------------------------------------
   12. Scroll reveal
   -------------------------------------------------------------------------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--dur-long) var(--ease-standard),
              transform var(--dur-long) var(--ease-spatial);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }