/* =========================================================================
   ZEPHYR — Design Tokens & Base
   ========================================================================= */

:root {
  /* Color system — navy / teal / gold, sampled directly from the Zephyr logo
     (the wing-and-wind mark: deep navy fading into a bright teal, with a small
     warm-gold accent where the strokes cross). Warm cream neutrals stay — navy
     + teal + cream + gold reads as a premium coastal/wind palette, and it keeps
     the product photography, not the chrome, as the star. Variable names kept
     for minimal churn; values changed to match the logo exactly. */
  --ink: #17130e;
  --ink-70: #17130eb3;
  --ink-40: #17130e99;
  --paper: #fbf6ec;
  --paper-2: #f2e6cd;
  --paper-3: #ead8b8;
  --cream-line: #e2cfa4;
  --terracotta: #146e93; /* primary accent — logo's mid-blue */
  --terracotta-dark: #0a4a66; /* logo's deep navy (wordmark) */
  --terracotta-light: #d7e9f0;
  --amber: #d9a22e; /* secondary accent — logo's small gold accent */
  --amber-dark: #a87a1e;
  --amber-light: #f6e7c6;
  --wind: #2e9dbb; /* tertiary — logo's bright teal/cyan swirl */
  --wind-dark: #166b85;
  --wind-light: #d9f0f2;
  --white: #fffdf9;

  /* Semantic */
  --bg: var(--paper);
  --bg-alt: var(--paper-2);
  --text: var(--ink);
  --text-soft: var(--ink-70);
  --text-faint: var(--ink-40);
  --accent: var(--terracotta);
  --accent-dark: var(--terracotta-dark);
  --line: var(--cream-line);
  /* Decorative only — never place white or light text directly on the amber end,
     contrast fails there. Used for glows, underlines, icon badges, borders.
     Blue-to-teal mirrors the logo's own gradient direction. */
  --gradient-brand: linear-gradient(135deg, var(--terracotta) 0%, var(--wind) 100%);

  /* Type */
  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Scale (fluid) — optical sizing: tracking tightens and leading loosens as size grows */
  --fs-display: clamp(3.2rem, 8vw, 7.2rem);
  --fs-h1: clamp(2.6rem, 6vw, 5.6rem);
  --fs-h2: clamp(2rem, 4vw, 3.4rem);
  --fs-h3: clamp(1.35rem, 2.4vw, 1.9rem);
  --fs-lead: clamp(1.05rem, 1.6vw, 1.3rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;

  --tracking-display: -0.035em;
  --tracking-h1: -0.025em;
  --tracking-h2: -0.018em;
  --tracking-h3: -0.012em;
  --tracking-body: 0;
  --tracking-eyebrow: 0.14em;

  --leading-display: 1.02;
  --leading-h1: 1.06;
  --leading-h2: 1.12;
  --leading-h3: 1.25;
  --leading-body: 1.6;

  /* Layout */
  --container: 1240px;
  --gutter: clamp(1.25rem, 5vw, 3rem);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  /* Motion — curves and durations are picked deliberately, never approximated.
     ease-out: entrances/exits. ease-in-out: on-screen movement/morphing. */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease: var(--ease-out);
  --ease-soft: var(--ease-out);
  --dur-press: 0.12s;
  --dur-fast: 0.2s;
  --dur-base: 0.45s;
  --dur-slow: 0.85s;
  --stagger: 60ms;

  /* Materials — translucent layers (Apple-style depth) */
  --glass-bg: rgba(248, 243, 234, 0.72);
  --glass-bg-strong: rgba(248, 243, 234, 0.88);
  --glass-border: rgba(255, 253, 249, 0.5);
  --glass-blur: blur(20px) saturate(180%);
  --glass-bg-ink: rgba(22, 20, 15, 0.55);
  --glass-border-ink: rgba(248, 243, 234, 0.12);

  --shadow-sm: 0 2px 10px rgba(22, 20, 15, 0.06);
  --shadow-md: 0 10px 30px rgba(22, 20, 15, 0.1);
  --shadow-lg: 0 24px 60px rgba(22, 20, 15, 0.16);
  --shadow-xl: 0 40px 90px rgba(22, 20, 15, 0.22);
}

/* =========================================================================
   Reset
   ========================================================================= */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

@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;
  }
}

body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

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

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

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

button { cursor: pointer; }

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 600;
}

/* Optical sizing: tracking tightens and leading loosens as type gets larger —
   never one letter-spacing value for every size (see apple-design §15). */
h1, .fs-display { letter-spacing: var(--tracking-h1); line-height: var(--leading-h1); }
h2 { letter-spacing: var(--tracking-h2); line-height: var(--leading-h2); }
h3, h4 { letter-spacing: var(--tracking-h3); line-height: var(--leading-h3); }

.fs-display {
  font-size: var(--fs-display);
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-display);
}

.icon {
  width: 1.2em;
  height: 1.2em;
  display: inline-block;
  flex-shrink: 0;
  vertical-align: -0.2em;
}

::selection { background: var(--terracotta); color: var(--white); }

:focus-visible {
  outline: 2.5px solid var(--terracotta);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -60px;
  background: var(--ink);
  color: var(--white);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--dur-fast) var(--ease);
}
.skip-link:focus { top: 1rem; }

/* =========================================================================
   Layout helpers
   ========================================================================= */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(4.5rem, 9vw, 8rem);
}

.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }

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

.section--ink {
  background: var(--ink);
  color: var(--paper);
}
.section--ink h2, .section--ink h3 { color: var(--paper); }

.section-head {
  max-width: 720px;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 1rem;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 3px;
  border-radius: 2px;
  background: var(--gradient-brand);
  display: inline-block;
}

.section-head--center .eyebrow::before { display: none; }

.lead {
  font-size: var(--fs-lead);
  color: var(--text-soft);
  max-width: 46ch;
}

.section-head--center .lead { margin-inline: auto; }

.grid {
  display: grid;
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* =========================================================================
   Reveal / scroll animation base (JS toggles .is-visible)
   ========================================================================= */

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease-soft), transform 0.8s var(--ease-soft);
  will-change: opacity, transform;
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

[data-reveal="scale"] { transform: scale(0.94); }
[data-reveal="scale"].is-visible { transform: scale(1); }

[data-reveal="left"] { transform: translateX(-32px); }
[data-reveal="left"].is-visible { transform: translateX(0); }

[data-reveal="right"] { transform: translateX(32px); }
[data-reveal="right"].is-visible { transform: translateX(0); }

[data-reveal-group] > * { transition-delay: calc(var(--i, 0) * var(--stagger)); }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}

/* Materials degrade gracefully rather than disappearing */
@media (prefers-reduced-transparency: reduce) {
  :root {
    --glass-bg: var(--paper);
    --glass-bg-strong: var(--paper);
    --glass-bg-ink: var(--ink);
  }
  .glass, .site-header.is-scrolled, .hero__float-card, .placeholder-frame__badge {
    backdrop-filter: none !important;
  }
}
@media (prefers-contrast: more) {
  :root { --line: var(--ink-40); --glass-border: var(--ink); --glass-border-ink: var(--paper); }
}