/* Base reset */
* { box-sizing: border-box; max-width: 100%; }
html { line-height: 1.5; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif; color: #111; background: #fafafa; }
img { max-width: 100%; height: auto; display: block; }
a { color: #0b5; text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

/* Theme */
:root {
  --brand: #0076b6;
  --brand-contrast: #ffffff;
  --accent: #e60033;
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #6b7280;

  /* Mobile-first scaling */
  --spacing: 1rem;
  --hero-padding: 3rem;
}

@media (min-width: 800px) {
  :root {
    --spacing: 2.5rem;
    --hero-padding: 15rem;
  }
}

.container { width: min(1200px, 92%); margin-inline: auto; }
.flow > * + * { margin-top: var(--spacing); }

.skip-link { position: absolute; left: -999px; top: -999px; background: #000; color: #fff; padding: .5rem .75rem; z-index: 1000; }
.skip-link:focus { left: .5rem; top: .5rem; }

/* Header */
.site-header {
  background: var(--brand);
  color: var(--brand-contrast);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .65rem 0;
}
.logo { color: var(--brand-contrast); font-weight: 700; letter-spacing: .5px; }

/* Make nav wrap on small screens */
.nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
}
.nav a {
  color: var(--brand-contrast);
  padding: .45rem .75rem;
  border-radius: .25rem;
  font-size: .95rem;
}

/* Hero */
.hero {
  background: linear-gradient(180deg, rgba(0,118,182,.75), rgba(0,118,182,.75)), url('images/hero-shibuya.jpg') center/cover no-repeat;
  color: #fff;
  padding: var(--hero-padding) 0;
  text-align: center;
}
.hero .btn {
  background: var(--accent);
  color: #fff;
  padding: .65rem 1rem;
  border-radius: .35rem;
  display: inline-block;
}
.hero .btn:hover { filter: brightness(.95); }

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: .85rem;
  margin: 1.25rem 0 2rem;
}
.card {
  background: var(--bg);
  border: 1px solid #e5e7eb;
  border-radius: .5rem;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0,0,0,.03);
}
.card h3 { margin: .75rem 1rem .25rem; }
.card p { margin: 0 1rem 1rem; color: var(--muted); }

/* Content */
main.container { padding: 1.25rem 0 2.5rem; }
section.block { padding: 1rem 0; border-top: 1px solid #eee; }

/* Mobile-first layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 820px) {
  .two-col { grid-template-columns: 1fr 1fr; }
}

/* Lists */
.list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: .75rem;
}
.list-grid li {
  background: var(--bg);
  border: 1px solid #e5e7eb;
  border-radius: .5rem;
  padding: .75rem .9rem;
}

/* Table */
table { width: 100%; border-collapse: collapse; }
th, td { border: 1px solid #e5e7eb; padding: .6rem .5rem; text-align: left; }
th { background: #f7fafc; }

/* Forms */
form { display: grid; gap: .85rem; max-width: 720px; }
label { font-weight: 600; }
input, select, textarea {
  width: 100%;
  padding: .6rem .65rem;
  border: 1px solid #cbd5e1;
  border-radius: .35rem;
  font: inherit;
}
textarea { min-height: 140px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: .85rem;
}
@media (min-width: 640px) {
  .form-row { grid-template-columns: 1fr 1fr; }
}
.actions { display: flex; gap: .75rem; }
button, .button {
  background: var(--brand);
  color: var(--brand-contrast);
  border: none;
  padding: .65rem 1rem;
  border-radius: .35rem;
  cursor: pointer;
}
button:hover, .button:hover { filter: brightness(.95); }

/* Footer */
.site-footer { background: #0f172a; color: #cbd5e1; }
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  padding: 1rem 0;
}
.site-footer a { color: #e2e8f0; }

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