/* ============================================================
   Big Sky Dynamics — bsdyno.com
   Design system: "Big Sky" — cool slate neutrals, sky-steel accent.
   Display: Cabinet Grotesk. Body: Satoshi. (Fontshare)
   ============================================================ */

:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 0.5rem + 7vw, 7rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --font-display: 'Cabinet Grotesk', 'Avenir Next', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', 'Helvetica Neue', sans-serif;

  --content-narrow: 680px;
  --content-default: 960px;
  --content-wide: 1160px;
}

/* ---- Light mode (default) ---- */
:root,
[data-theme='light'] {
  color-scheme: light;
  --color-bg: #f6f8f9;
  --color-surface: #fbfcfd;
  --color-surface-2: #ffffff;
  --color-surface-offset: #edf1f4;
  --color-surface-offset-2: #e2e9ed;
  --color-divider: #dde4e8;
  --color-border: #ccd6dc;

  --color-text: #16222b;
  --color-text-muted: #56656f;
  --color-text-faint: #93a2ab;
  --color-text-inverse: #f7fafb;

  --color-primary: #0b5fa5;
  --color-primary-hover: #094d88;
  --color-primary-active: #073c6c;
  --color-primary-highlight: #d9e8f3;

  --color-accent-sky: #2f8fd4;

  --shadow-sm: 0 1px 2px rgba(18, 33, 43, 0.06);
  --shadow-md: 0 4px 14px rgba(18, 33, 43, 0.09);
  --shadow-lg: 0 16px 40px rgba(18, 33, 43, 0.14);
}

/* ---- Dark mode ---- */
[data-theme='dark'] {
  color-scheme: dark;
  --color-bg: #0f151a;
  --color-surface: #141c22;
  --color-surface-2: #18222a;
  --color-surface-offset: #1a252e;
  --color-surface-offset-2: #20303c;
  --color-divider: #22303a;
  --color-border: #2e404d;

  --color-text: #d5dde2;
  --color-text-muted: #8fa0aa;
  --color-text-faint: #5d6e78;
  --color-text-inverse: #10181e;

  --color-primary: #6db4e8;
  --color-primary-hover: #8cc5ef;
  --color-primary-active: #a8d5f4;
  --color-primary-highlight: #1d3345;

  --color-accent-sky: #4d9bd6;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --color-bg: #0f151a;
    --color-surface: #141c22;
    --color-surface-2: #18222a;
    --color-surface-offset: #1a252e;
    --color-surface-offset-2: #20303c;
    --color-divider: #22303a;
    --color-border: #2e404d;
    --color-text: #d5dde2;
    --color-text-muted: #8fa0aa;
    --color-text-faint: #5d6e78;
    --color-text-inverse: #10181e;
    --color-primary: #6db4e8;
    --color-primary-hover: #8cc5ef;
    --color-primary-active: #a8d5f4;
    --color-primary-highlight: #1d3345;
    --color-accent-sky: #4d9bd6;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
  }
}

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: var(--space-20);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  text-wrap: balance;
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.015em;
}

p,
li,
figcaption {
  text-wrap: pretty;
  max-width: 68ch;
}

::selection {
  background: color-mix(in oklab, var(--color-primary) 25%, transparent);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

a,
button {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ================= Layout primitives ================= */
.container {
  width: min(var(--content-wide), 100% - 2 * var(--space-6));
  margin-inline: auto;
}

.container--narrow {
  width: min(var(--content-narrow), 100% - 2 * var(--space-6));
}

.section {
  padding-block: clamp(var(--space-16), 7vw, var(--space-24));
}

.section--tight {
  padding-block: clamp(var(--space-12), 5vw, var(--space-16));
}

.section--offset {
  background: var(--color-surface);
  border-block: 1px solid var(--color-divider);
}

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.eyebrow::before {
  content: '';
  display: inline-block;
  width: 1.75rem;
  height: 2px;
  background: var(--color-primary);
  flex: none;
}

.section-title {
  font-size: var(--text-xl);
  margin-block: var(--space-4) var(--space-5);
  max-width: 24ch;
}

.section-lead {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  line-height: 1.5;
  max-width: 56ch;
}

/* ================= Header ================= */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}

.header--scrolled {
  border-bottom-color: var(--color-divider);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  letter-spacing: -0.01em;
}

.brand__mark {
  color: var(--color-primary);
  flex: none;
}

.brand__name {
  white-space: nowrap;
}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
}

.nav a:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.nav a[aria-current='page'] {
  color: var(--color-text);
  font-weight: 700;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  align-items: center;
  justify-content: center;
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
  }
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    box-shadow: var(--shadow-md);
    padding: var(--space-3) var(--space-4) var(--space-4);
    margin-left: 0;
  }
  .nav--open {
    display: flex;
  }
  .nav a {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
  }
  .theme-toggle {
    margin-left: 0;
  }
}

/* ================= Hero ================= */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(var(--space-16), 9vw, var(--space-32)) clamp(var(--space-16), 8vw, var(--space-24));
}

.hero__grid-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--color-divider) 1px, transparent 1px);
  background-size: 12.5% 100%;
  opacity: 0.45;
  mask-image: linear-gradient(to bottom, transparent, black 20%, black 80%, transparent);
}

.hero__inner {
  position: relative;
}

.hero h1 {
  font-size: var(--text-hero);
  line-height: 1.02;
  letter-spacing: -0.03em;
  max-width: 15ch;
  margin-block: var(--space-6);
}

.hero h1 em {
  font-style: normal;
  color: var(--color-primary);
}

.hero__lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: 1.55;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-10);
}

/* Interior page hero */
.page-hero {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20)) clamp(var(--space-8), 4vw, var(--space-12));
  border-bottom: 1px solid var(--color-divider);
  position: relative;
  overflow: hidden;
}

.page-hero h1 {
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
  max-width: 22ch;
  margin-block: var(--space-5) var(--space-5);
}

.page-hero .section-lead {
  font-size: var(--text-base);
}

/* ================= Buttons ================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  line-height: 1.4;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--primary:active {
  background: var(--color-primary-active);
}

.btn--ghost {
  border-color: var(--color-border);
  color: var(--color-text);
  background: transparent;
}

.btn--ghost:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-text-faint);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn .arrow {
  transition: transform var(--transition-interactive);
}

.btn:hover .arrow {
  transform: translateX(3px);
}

/* ================= Cards ================= */
.card-grid {
  display: grid;
  gap: var(--space-5);
  margin-top: var(--space-10);
}

@media (min-width: 640px) {
  .card-grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .card-grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
}

.card__icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  margin-bottom: var(--space-2);
}

.card h3 {
  font-size: var(--text-lg);
}

.card p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

.card__link {
  margin-top: auto;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.card__link:hover {
  color: var(--color-primary-hover);
}

/* ================= Split (asymmetric two-column) ================= */
.split {
  display: grid;
  gap: var(--space-10);
  align-items: start;
}

@media (min-width: 900px) {
  .split {
    grid-template-columns: 5fr 7fr;
    gap: var(--space-16);
  }
  .split--flip {
    grid-template-columns: 7fr 5fr;
  }
}

.split__aside {
  position: relative;
}

@media (min-width: 900px) {
  .split__aside {
    position: sticky;
    top: var(--space-24);
  }
}

/* ================= Steps / process ================= */
.steps {
  display: grid;
  gap: var(--space-8);
  margin-top: var(--space-10);
  counter-reset: step;
}

@media (min-width: 760px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1020px) {
  .steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

.step {
  border-top: 2px solid var(--color-border);
  padding-top: var(--space-5);
}

.step::before {
  counter-increment: step;
  content: '0' counter(step);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-sm);
  color: var(--color-primary);
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: var(--space-3);
}

.step h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.step p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ================= Checklist ================= */
.checklist {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.checklist li {
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
  color: var(--color-text-muted);
  max-width: 60ch;
}

.checklist li::before {
  content: '';
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 1px;
  background: var(--color-primary);
  flex: none;
  transform: translateY(-1px);
}

.checklist strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ================= CTA band ================= */
.cta-band {
  background:
    radial-gradient(120% 140% at 85% -10%, color-mix(in oklab, var(--color-primary) 32%, transparent), transparent 60%),
    var(--color-surface-offset);
  border-block: 1px solid var(--color-divider);
}

.cta-band__inner {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 860px) {
  .cta-band__inner {
    grid-template-columns: 1.4fr 1fr;
  }
}

.cta-band h2 {
  font-size: var(--text-xl);
  max-width: 26ch;
  margin-top: var(--space-4);
}

.cta-band p {
  color: var(--color-text-muted);
  margin-top: var(--space-3);
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ================= Contact panel ================= */
.contact-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
}

.contact-list {
  list-style: none;
  display: grid;
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.contact-list a {
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: none;
}

.contact-list a:hover {
  color: var(--color-primary-hover);
}

.definition {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.definition dt {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

.definition dd {
  font-size: var(--text-base);
}

/* ================= Store placeholder ================= */
.store-hero {
  text-align: center;
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

.store-hero .eyebrow {
  justify-content: center;
}

.store-hero .eyebrow::before {
  display: none;
}

.store-hero h1 {
  font-size: var(--text-3xl);
  margin-block: var(--space-5);
  letter-spacing: -0.025em;
}

.store-hero p {
  margin-inline: auto;
  color: var(--color-text-muted);
  max-width: 46ch;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  margin-top: var(--space-8);
}

.status-pill::before {
  content: '';
  width: 0.5rem;
  height: 0.5rem;
  border-radius: var(--radius-full);
  background: var(--color-accent-sky);
}

/* ================= Big statement / pull quote ================= */
.pull {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  max-width: 30ch;
  color: var(--color-text);
}

.pull em {
  font-style: normal;
  color: var(--color-primary);
}

/* ================= Divider mark ================= */
.horizon-rule {
  border: none;
  height: 1px;
  background: var(--color-divider);
  position: relative;
  overflow: visible;
  margin-block: var(--space-12);
}

/* ================= Footer ================= */
.footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding-block: var(--space-12) var(--space-8);
  margin-top: var(--space-16);
}

.footer__grid {
  display: grid;
  gap: var(--space-10);
}

@media (min-width: 820px) {
  .footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

.footer h4 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

.footer ul {
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.footer a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
}

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

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  margin-bottom: var(--space-4);
}

.footer__tagline {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  max-width: 34ch;
}

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
}

/* ================= 404 ================= */
.error-hero {
  text-align: center;
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
}

.error-hero h1 {
  font-size: var(--text-3xl);
  margin-block: var(--space-5) var(--space-4);
}

.error-hero p {
  margin-inline: auto;
  color: var(--color-text-muted);
}