/* ==========================================================================
   KAISEI — kaiseix.com  |  Shared styles (v3.0)
   Tailwind (CDN) handles utilities; this file holds brand tokens + components.
   ========================================================================== */

:root {
  /* Brand */
  --color-navy-900: #0B1F33;
  --color-navy-700: #13314F;
  --color-indigo-600: #1F4E79;
  --color-indigo-400: #3E6EA0;
  --color-gold-500: #C9A227;
  --color-gold-300: #E0C463;
  /* Accessible gold for TEXT on light backgrounds (AA ~4.9:1 on white).
     Use --color-gold-500 only for fills/lines, never for small text. */
  --color-gold-text: #8A6D1A;
  /* Neutral */
  --color-white: #FFFFFF;
  --color-gray-50: #F5F7FA;
  --color-gray-100: #EAEEF3;
  --color-gray-300: #C7D0DA;
  --color-gray-500: #8A97A6;
  --color-gray-700: #4A5765;
  --color-gray-900: #1A2430;
  /* Elevation / radius */
  --shadow-sm: 0 1px 2px rgba(11,31,51,.06);
  --shadow-md: 0 4px 16px rgba(11,31,51,.08);
  --shadow-lg: 0 12px 40px rgba(11,31,51,.12);
  --radius-md: 6px;
  --radius-lg: 12px;
  --ease: cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }
body {
  font-family: "Inter", "Noto Sans JP", "Noto Sans SC", system-ui, sans-serif;
  color: var(--color-gray-900);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}
:lang(ja) h1, :lang(ja) h2, :lang(ja) h3 { font-family: "Noto Serif JP", serif; }
:lang(zh) h1, :lang(zh) h2, :lang(zh) h3 { font-family: "Noto Serif SC", serif; }
:lang(ja) p, :lang(ja) li { line-height: 1.8; }
:lang(zh) p, :lang(zh) li { line-height: 1.8; }

.site-shell { display: flex; min-height: 100vh; flex-direction: column; }

/* ---- Header / nav ---- */
.header-logo { height: 40px; width: auto; display: block; }
.nav-link {
  font-size: .95rem; font-weight: 600; color: var(--color-gray-700);
  padding-bottom: 2px; border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.nav-link:hover { color: var(--color-indigo-600); }
.nav-link.is-active { color: var(--color-navy-900); border-color: var(--color-gold-500); }

.language-select select {
  border: 1px solid var(--color-gray-300); border-radius: var(--radius-md);
  padding: .4rem .6rem; font-size: .85rem; font-weight: 600; background: #fff;
  color: var(--color-gray-700); cursor: pointer;
}

/* ---- Buttons ---- */
.btn-primary, .btn-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .75rem 1.5rem; border-radius: var(--radius-md);
  font-weight: 700; font-size: .95rem; text-align: center;
  transition: transform .15s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease);
}
.btn-primary { background: var(--color-gold-500); color: var(--color-navy-900); }
.btn-primary:hover { background: var(--color-gold-300); box-shadow: var(--shadow-md); }
.btn-secondary { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.6); }
.btn-secondary:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn-outline {
  display: inline-flex; align-items: center; padding: .75rem 1.5rem;
  border-radius: var(--radius-md); font-weight: 700; font-size: .95rem;
  border: 1.5px solid var(--color-indigo-600); color: var(--color-indigo-600);
  transition: all .2s var(--ease);
}
.btn-outline:hover { background: var(--color-indigo-600); color: #fff; }
*:focus-visible { outline: 3px solid var(--color-gold-300); outline-offset: 2px; }

/* ---- Sections / helpers ---- */
.section-label {
  font-size: .75rem; font-weight: 700; letter-spacing: .16em;
  text-transform: uppercase; color: var(--color-gold-text);
}
.gold-line { height: 3px; width: 56px; background: var(--color-gold-500); border-radius: 999px; }
.bg-alt { background: var(--color-gray-50); }
.bg-navy { background: var(--color-navy-900); color: #fff; }

.hero-bg {
  background:
    linear-gradient(180deg, rgba(11,31,51,.72), rgba(11,31,51,.88)),
    radial-gradient(1200px 600px at 70% -10%, #1F4E79 0%, transparent 60%),
    var(--color-navy-900);
  color: #fff;
}
.hero-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.hero-visual {
  min-height: 24rem;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  background: var(--color-navy-700);
}
.hero-visual img,
.feature-image img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}
.hero-tile {
  min-height: 9rem;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(145deg, rgba(224,196,99,.16), transparent 45%),
    linear-gradient(145deg, rgba(62,110,160,.85), rgba(11,31,51,.95));
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-end;
  padding: 1rem;
}
.hero-tile.tall { min-height: 15rem; }
.hero-tile span {
  color: #fde68a;
  font-size: .9rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.image-panel {
  min-height: 22rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
  color: #fff;
  background: var(--color-navy-900);
}
.feature-image {
  min-height: 22rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  background: var(--color-gray-100);
}
.image-panel span {
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.panel-japan {
  background:
    linear-gradient(180deg, rgba(11,31,51,.08), rgba(11,31,51,.82)),
    linear-gradient(135deg, #f8fafc 0 18%, #dbeafe 18% 36%, #0f172a 36% 52%, #c9a227 52% 56%, #1f4e79 56% 100%);
}
.panel-grid {
  background:
    linear-gradient(180deg, rgba(11,31,51,.12), rgba(11,31,51,.84)),
    repeating-linear-gradient(90deg, rgba(255,255,255,.12) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(255,255,255,.10) 0 1px, transparent 1px 72px),
    linear-gradient(135deg, #13314f, #1f4e79);
}
.cta-band {
  background:
    linear-gradient(135deg, rgba(255,255,255,.28), transparent 42%),
    linear-gradient(120deg, var(--color-gold-500), var(--color-gold-300));
  color: var(--color-navy-900);
}
.stat-number {
  color: var(--color-gold-300);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1;
}
.page-header {
  background: linear-gradient(180deg, var(--color-navy-900), var(--color-navy-700));
  color: #fff;
}

/* ---- Cards ---- */
.card {
  background: #fff; border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  padding: 1.75rem; transition: box-shadow .2s var(--ease), transform .2s var(--ease);
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.card-title { font-weight: 700; font-size: 1.15rem; color: var(--color-gray-900); }

.company-profile {
  overflow: hidden;
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.company-profile-row {
  display: grid;
  grid-template-columns: minmax(10rem, 14rem) 1fr;
  border-top: 1px solid var(--color-gray-100);
}
.company-profile-row:first-child { border-top: 0; }
.company-profile dt {
  background: var(--color-gray-50);
  color: var(--color-gray-700);
  font-weight: 700;
  padding: 1rem 1.25rem;
}
.company-profile dd {
  color: var(--color-gray-900);
  padding: 1rem 1.25rem;
}
.portfolio-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.portfolio-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  text-align: left;
}
.portfolio-table th,
.portfolio-table td {
  border-top: 1px solid var(--color-gray-100);
  padding: 1rem 1.25rem;
  vertical-align: top;
}
.portfolio-table thead th {
  border-top: 0;
  background: var(--color-navy-900);
  color: #fff;
  font-size: .85rem;
  letter-spacing: .04em;
}
.portfolio-table tbody th {
  color: var(--color-indigo-600);
  font-weight: 800;
}
.portfolio-table tbody td {
  color: var(--color-gray-700);
}
@media (max-width: 640px) {
  .company-profile-row { grid-template-columns: 1fr; }
  .company-profile dt { padding-bottom: .35rem; }
  .company-profile dd { padding-top: .35rem; }
}

/* ---- Forms ---- */
.field-label { font-size: .85rem; font-weight: 600; color: var(--color-gray-700); }
.field {
  width: 100%; border: 1px solid var(--color-gray-300); border-radius: var(--radius-md);
  padding: .7rem .85rem; font-size: .95rem; color: var(--color-gray-900);
  background: #fff; transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.field:focus { border-color: var(--color-indigo-600); box-shadow: 0 0 0 3px rgba(31,78,121,.15); outline: none; }

/* ---- Footer ---- */
.site-footer { background: var(--color-navy-900); color: #cbd5e1; }
.site-footer a { color: #cbd5e1; transition: color .2s var(--ease); }
.site-footer a:hover { color: var(--color-gold-300); }

/* ---- Mobile menu ---- */
.mobile-panel { display: none; }
.mobile-panel.is-open { display: block; }

/* ---- Motion ---- */
[data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .card:hover { transform: none; }
}