/* ==========================================================================
   MyFlightsAssist — Design Tokens
   Concept: airport wayfinding + boarding-pass stub, rendered in a warm,
   paper-and-ink palette rather than any single airline's brand colors.
   ========================================================================== */

:root {
  /* Color */
  --ink: #16233F;        /* primary text, primary dark surfaces */
  --ink-soft: #223159;   /* secondary dark surface, gradients */
  --paper: #FAF8F3;      /* page background */
  --paper-dim: #F1ECE1;  /* secondary background panels */
  --brass: #A2732F;      /* accent: links, CTAs, highlights */
  --brass-deep: #7E5A24; /* accent hover/active */
  --slate: #5B6672;      /* secondary/muted text on paper */
  --slate-on-ink: #B7C0D6; /* secondary text on ink surfaces */
  --line: #DEDACD;       /* hairline borders on paper */
  --line-on-ink: #3A4568; /* hairline borders on ink */
  --ok-bg: #EFF3EC;
  --ok-text: #3E5C3E;
  --white: #FFFFFF;

  /* Type */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --step--1: clamp(0.85rem, 0.82rem + 0.15vw, 0.95rem);
  --step-0:  clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --step-1:  clamp(1.2rem, 1.1rem + 0.4vw, 1.4rem);
  --step-2:  clamp(1.5rem, 1.3rem + 0.8vw, 1.9rem);
  --step-3:  clamp(1.9rem, 1.6rem + 1.4vw, 2.6rem);
  --step-4:  clamp(2.4rem, 1.9rem + 2.2vw, 3.6rem);

  /* Layout */
  --content-max: 74rem;
  --measure: 62ch;
  --radius-sm: 3px;
  --radius-md: 6px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 2.75rem;
  --space-5: 4.5rem;
  --space-6: 7rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 0.5em;
  font-weight: 600;
}

h1 { font-size: var(--step-4); font-weight: 500; }
h2 { font-size: var(--step-3); font-weight: 500; }
h3 { font-size: var(--step-2); font-weight: 600; }
h4 { font-size: var(--step-1); font-weight: 600; }

p { margin: 0 0 1em; max-width: var(--measure); }
p.wide { max-width: none; }

a { color: var(--brass-deep); text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
a:hover { color: var(--brass); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible, summary:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.eyebrow {
  color: var(--brass-deep);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.section { padding-block: var(--space-5); }
.section--tight { padding-block: var(--space-4); }
.section--ink { background: var(--ink); color: var(--white); }
.section--ink h2, .section--ink h3 { color: var(--white); }
.section--ink p { color: var(--slate-on-ink); }
.section--dim { background: var(--paper-dim); }

.rule {
  border: none;
  border-top: 1px solid var(--line);
  margin: var(--space-4) 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--step--1);
  padding: 0.85em 1.5em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  line-height: 1;
}
.btn--primary { background: var(--brass); color: var(--white); }
.btn--primary:hover { background: var(--brass-deep); color: var(--white); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--white); }
.btn--on-ink { background: var(--white); color: var(--ink); }
.btn--on-ink:hover { background: var(--brass); color: var(--white); }
.btn--disabled { background: var(--line); color: var(--slate); cursor: not-allowed; pointer-events: none; }

.tag {
  display: inline-block;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--ink);
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3em 0.9em;
}

.badge-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0;
}
.badge-strip li {
  display: flex;
  align-items: baseline;
  gap: 0.5em;
  font-size: var(--step--1);
  color: var(--slate);
}
.badge-strip strong { color: var(--ink); font-size: var(--step-0); }
.section--ink .badge-strip li { color: var(--slate-on-ink); }
.section--ink .badge-strip strong { color: var(--white); }

/* Flight-path divider: the one recurring structural motif, used sparingly */
.flight-divider {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-4) 0;
  color: var(--brass-deep);
}
.flight-divider::before,
.flight-divider::after {
  content: "";
  flex: 1;
  border-top: 1px dashed var(--line);
}
.flight-divider svg { flex-shrink: 0; }

.grid {
  display: grid;
  gap: var(--space-3);
}
@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) {
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: var(--space-3);
}
.card h3, .card h4 { margin-bottom: 0.4em; }
.card p:last-child { margin-bottom: 0; }

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

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--white);
  padding: 0.75em 1.25em; z-index: 100;
}
.skip-link:focus { left: var(--space-3); top: var(--space-3); }

.breadcrumb {
  font-size: var(--step--1);
  color: var(--slate);
  margin-bottom: var(--space-3);
}
.breadcrumb a { color: var(--slate); }
.breadcrumb span[aria-current] { color: var(--ink); }

table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 0.6em 0.8em; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--font-body); font-weight: 600; color: var(--ink); }