/* ==========================================================================
   Morikawa Partners — Design System
   丸の内のエンタープライズ税理士法人。濃紺×白×銀のBIG4級コーポレートトーン
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+JP:wght@300;400;500;600;700&family=Noto+Serif+JP:wght@400;600;700&display=swap');

:root {
  /* Core Palette ---------------------------------------------------------- */
  --navy-900: #07152A;
  --navy-800: #0B1F3A;          /* primary */
  --navy-700: #132F54;
  --navy-600: #1F3F6E;
  --navy-500: #2C5088;

  --silver-50:  #F5F6F8;
  --silver-100: #EAECF0;
  --silver-200: #D9DCE2;
  --silver-300: #C0C4CA;        /* brand silver */
  --silver-400: #9AA0A8;
  --silver-500: #6E747E;
  --silver-600: #4A4F58;

  --ink-900: #0E1420;
  --ink-700: #2A3142;
  --ink-500: #525A6B;

  --white: #FFFFFF;
  --cream: #FAFAF7;

  --accent-gold: #B79154;       /* used sparingly — awards / premium */
  --accent-line: #8A6D3F;

  --success: #2E7D5B;
  --danger:  #B33A3A;

  /* Surfaces */
  --surface-0: #FFFFFF;
  --surface-1: #F8F9FB;
  --surface-2: #EFF2F6;
  --surface-navy: #0B1F3A;
  --surface-navy-deep: #07152A;

  /* Type stacks */
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-jp: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --font-serif-jp: 'Noto Serif JP', 'Yu Mincho', 'Hiragino Mincho ProN', serif;
  --font-sans: var(--font-en), var(--font-jp);

  /* Spacing scale (8px base) */
  --s-1: 4px;   --s-2: 8px;   --s-3: 12px;  --s-4: 16px;
  --s-5: 20px;  --s-6: 24px;  --s-8: 32px;  --s-10: 40px;
  --s-12: 48px; --s-16: 64px; --s-20: 80px; --s-24: 96px;
  --s-32: 128px; --s-40: 160px;

  /* Layout */
  --container: 1360px;
  --container-wide: 1480px;
  --gutter: 32px;
  --nav-h: 76px;

  /* Radii — conservative, enterprise */
  --r-0: 0;
  --r-1: 2px;
  --r-2: 4px;
  --r-3: 8px;

  /* Shadows — restrained */
  --sh-1: 0 1px 2px rgba(11,31,58,.06), 0 1px 1px rgba(11,31,58,.04);
  --sh-2: 0 4px 16px rgba(11,31,58,.08), 0 1px 2px rgba(11,31,58,.06);
  --sh-3: 0 12px 40px rgba(11,31,58,.12), 0 2px 6px rgba(11,31,58,.06);
  --sh-navy: 0 20px 60px rgba(7,21,42,.35);

  --ease: cubic-bezier(.2,.7,.2,1);
}

/* Reset ------------------------------------------------------------------- */
*,*::before,*::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-sans);
  color: var(--ink-900);
  background: var(--white);
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: .01em;
  font-feature-settings: "palt";
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
h1,h2,h3,h4,h5 { margin: 0; font-weight: 600; letter-spacing: -.01em; line-height: 1.25; }

/* Typography -------------------------------------------------------------- */
.eyebrow {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--silver-500);
}
.eyebrow.on-navy { color: var(--silver-300); }
.eyebrow--gold { color: var(--accent-gold); }

.h-display {
  font-family: var(--font-jp);
  font-weight: 500;
  font-size: clamp(44px, 5.2vw, 78px);
  line-height: 1.15;
  letter-spacing: -.015em;
}
.h-display .en {
  display:block;
  font-family: var(--font-en);
  font-weight: 300;
  font-size: .4em;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--silver-400);
  margin-top: 18px;
}

.h-1 { font-size: clamp(40px, 4vw, 56px); font-weight: 500; line-height: 1.18; letter-spacing: -.015em; }
.h-2 { font-size: clamp(30px, 2.6vw, 40px); font-weight: 500; line-height: 1.25; letter-spacing: -.01em; }
.h-3 { font-size: clamp(22px, 1.6vw, 26px); font-weight: 600; line-height: 1.35; }
.h-4 { font-size: 18px; font-weight: 600; line-height: 1.4; }

.body-lg { font-size: 17px; line-height: 1.8; color: var(--ink-700); }
.body    { font-size: 15px; line-height: 1.75; color: var(--ink-700); }
.body-sm { font-size: 13px; line-height: 1.7; color: var(--silver-500); }
.mono    { font-family: var(--font-en); font-variant-numeric: tabular-nums; letter-spacing: .04em; }

.serif-mark {
  font-family: var(--font-serif-jp);
  font-weight: 600;
}

/* Layout ------------------------------------------------------------------ */
.container {
  width: min(100% - 48px, var(--container));
  margin-inline: auto;
}
.container-wide { width: min(100% - 48px, var(--container-wide)); margin-inline: auto; }

.section { padding: var(--s-24) 0; }
.section-sm { padding: var(--s-16) 0; }
.section-lg { padding: var(--s-32) 0; }

.on-navy {
  background: var(--surface-navy);
  color: var(--white);
}
.on-navy-deep { background: var(--surface-navy-deep); color: var(--white); }
.on-silver { background: var(--surface-1); }

/* Hairline accents — BIG4 signature */
.hair-top    { border-top: 1px solid var(--silver-200); }
.hair-bottom { border-bottom: 1px solid var(--silver-200); }
.on-navy .hair-top, .on-navy .hair-bottom,
.on-navy-deep .hair-top, .on-navy-deep .hair-bottom {
  border-color: rgba(255,255,255,.08);
}

/* Navigation -------------------------------------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--silver-100);
}
.nav--on-hero {
  background: rgba(7,21,42,.55);
  backdrop-filter: saturate(130%) blur(10px);
  -webkit-backdrop-filter: saturate(130%) blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  color: var(--white);
}
.nav-inner {
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px;
}
.brand {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--font-jp);
  font-weight: 600; letter-spacing: .02em;
}
.brand-mark {
  width: 34px; height: 34px; flex: none;
}
.brand-text { display:flex; flex-direction: column; line-height: 1; }
.brand-text .ja { font-size: 15px; letter-spacing: .08em; }
.brand-text .en { font-family: var(--font-en); font-size: 10px; font-weight: 500; letter-spacing: .2em; color: var(--silver-500); margin-top: 4px; text-transform: uppercase;}
.nav--on-hero .brand-text .en { color: var(--silver-300); }

.nav-menu {
  display: flex; align-items: center; gap: 4px;
}
.nav-link {
  padding: 10px 14px;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .04em;
  color: inherit;
  opacity: .85;
  position: relative;
}
.nav-link:hover { opacity: 1; }
.nav-link.is-active { opacity: 1; }
.nav-link.is-active::after {
  content:''; position:absolute; left: 14px; right: 14px; bottom: 4px;
  height: 2px; background: var(--accent-gold);
}
.nav-right { display: flex; align-items: center; gap: 16px; }
.lang-switch {
  display: flex; align-items: center; gap: 2px;
  font-family: var(--font-en);
  font-size: 11.5px; font-weight: 500; letter-spacing: .16em;
  color: var(--silver-500);
}
.nav--on-hero .lang-switch { color: var(--silver-300); }
.lang-switch button {
  padding: 6px 8px;
  border-radius: var(--r-1);
  color: inherit;
  opacity: .65;
  transition: opacity .15s;
}
.lang-switch button.is-active { opacity: 1; color: var(--navy-800); font-weight: 600;}
.nav--on-hero .lang-switch button.is-active { color: var(--white); }
.lang-switch .sep { opacity: .3; }

/* Buttons ---------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px;
  font-family: var(--font-en);
  font-size: 13px; font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  border-radius: var(--r-1);
  transition: all .2s var(--ease);
  white-space: nowrap;
}
.btn .arrow { width: 14px; height: 10px; transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }
.btn-primary {
  background: var(--navy-800); color: var(--white);
  border: 1px solid var(--navy-800);
}
.btn-primary:hover { background: var(--navy-700); border-color: var(--navy-700); }
.btn-ghost {
  background: transparent; color: inherit;
  border: 1px solid currentColor;
}
.btn-ghost.on-light { color: var(--navy-800); border-color: var(--silver-300);}
.btn-ghost.on-light:hover { background: var(--navy-800); color: var(--white); border-color: var(--navy-800); }
.btn-ghost.on-dark { color: var(--white); border-color: rgba(255,255,255,.3);}
.btn-ghost.on-dark:hover { background: var(--white); color: var(--navy-800); }

.btn-link {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-en);
  font-size: 12px; font-weight: 500; letter-spacing: .16em;
  text-transform: uppercase;
  padding-bottom: 6px;
  border-bottom: 1px solid currentColor;
  transition: gap .2s var(--ease);
}
.btn-link:hover { gap: 16px; }

/* Cards ------------------------------------------------------------------ */
.card {
  background: var(--white);
  border: 1px solid var(--silver-100);
  transition: border-color .2s, box-shadow .2s, transform .2s;
}
.card:hover { border-color: var(--silver-300); box-shadow: var(--sh-2); }
.card--dark { background: var(--navy-700); border-color: rgba(255,255,255,.08); color: var(--white); }
.card--dark:hover { border-color: rgba(255,255,255,.2); }

/* Chip / Tag */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  font-family: var(--font-en);
  font-size: 10.5px; font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  border: 1px solid var(--silver-200);
  color: var(--silver-600);
  border-radius: 999px;
  background: var(--white);
}
.chip--gold { border-color: var(--accent-line); color: var(--accent-line); }
.chip--navy { background: var(--navy-800); color: var(--white); border-color: var(--navy-800); }
.on-navy .chip { border-color: rgba(255,255,255,.2); color: var(--silver-200); background: transparent;}

/* Section header ---------------------------------------------------------- */
.sec-head {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  padding-bottom: var(--s-12);
  align-items: end;
}
.sec-head .num {
  font-family: var(--font-en);
  font-size: 12px; letter-spacing: .2em; color: var(--accent-gold);
  margin-bottom: 14px; display: block;
}
.sec-head h2 {
  font-family: var(--font-jp);
  font-weight: 500;
  font-size: clamp(32px, 2.8vw, 44px);
  line-height: 1.25;
  letter-spacing: -.01em;
}
.sec-head .en-sub {
  font-family: var(--font-en);
  font-weight: 300;
  font-size: 13px; letter-spacing: .22em;
  color: var(--silver-500);
  text-transform: uppercase;
  margin-top: 12px;
}
.sec-head .rhs { color: var(--ink-700); font-size: 15.5px; line-height: 1.85; max-width: 56ch; }

/* Footer ------------------------------------------------------------------ */
.footer {
  background: var(--navy-900);
  color: var(--silver-200);
  padding: 80px 0 32px;
  font-size: 13px;
}
.footer a:hover { color: var(--white); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 48px;
  padding-bottom: 64px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer h4 {
  font-family: var(--font-en);
  font-size: 11px; font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--silver-400);
  margin-bottom: 20px;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.footer-brand .ja { font-family: var(--font-jp); font-size: 18px; font-weight: 600; color: var(--white); letter-spacing: .05em;}
.footer-brand .en { font-family: var(--font-en); font-size: 11px; letter-spacing: .22em; color: var(--silver-400); margin-top: 8px; text-transform: uppercase; }
.footer-brand p { color: var(--silver-300); font-size: 13px; line-height: 1.8; margin-top: 24px; max-width: 34ch; }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 32px; font-size: 11.5px; color: var(--silver-400);
  letter-spacing: .05em;
}
.footer-bottom .certs { display: flex; gap: 24px; align-items: center;}
.cert-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 2px;
  font-family: var(--font-en); font-size: 10px; letter-spacing: .15em;
  color: var(--silver-300);
}
.cert-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--success); }

/* Utility ----------------------------------------------------------------- */
.divider { height: 1px; background: var(--silver-100); width: 100%; }
.on-navy .divider { background: rgba(255,255,255,.08); }

.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }

.stat {
  display: grid; gap: 6px;
}
.stat .num {
  font-family: var(--font-en);
  font-size: clamp(42px, 3.6vw, 56px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--navy-800);
  font-variant-numeric: tabular-nums;
}
.stat .num sup { font-size: .5em; font-weight: 300; vertical-align: top; margin-left: 4px; color: var(--accent-gold); }
.on-navy .stat .num { color: var(--white); }
.stat .lbl {
  font-family: var(--font-en); font-size: 11px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--silver-500);
}
.on-navy .stat .lbl { color: var(--silver-300); }
.stat .ja-lbl { font-family: var(--font-jp); font-size: 13px; color: var(--ink-700); margin-top: 2px;}
.on-navy .stat .ja-lbl { color: var(--silver-200); }

/* Breadcrumb */
.crumbs {
  display:flex; align-items: center; gap: 10px;
  font-family: var(--font-en); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--silver-500);
  padding: 20px 0;
}
.crumbs .sep { opacity: .5; }
.crumbs .cur { color: var(--navy-800); }

/* Page intro block */
.page-intro {
  padding: 72px 0 64px;
  background: var(--surface-1);
  border-bottom: 1px solid var(--silver-100);
}
.page-intro h1 {
  font-family: var(--font-jp);
  font-weight: 500;
  font-size: clamp(40px, 4.2vw, 60px);
  line-height: 1.2; letter-spacing: -.015em;
}
.page-intro .en {
  font-family: var(--font-en);
  font-weight: 300;
  font-size: 13px; letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--accent-gold);
  display: block; margin-bottom: 16px;
}
.page-intro p.lede {
  margin-top: 24px;
  font-size: 17px; line-height: 1.85; color: var(--ink-700);
  max-width: 64ch;
}

/* Small helpers */
.mt-2 { margin-top: 8px; } .mt-4 { margin-top: 16px; } .mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; } .mt-10 { margin-top: 40px; } .mt-12 { margin-top: 48px; }
.mb-4 { margin-bottom: 16px; } .mb-6 { margin-bottom: 24px; } .mb-8 { margin-bottom: 32px; } .mb-12 { margin-bottom: 48px; }

.text-gold { color: var(--accent-gold); }
.text-silver { color: var(--silver-400); }
.text-navy { color: var(--navy-800); }
.text-center { text-align: center; }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* Scroll marquee ticker */
.ticker {
  overflow: hidden; white-space: nowrap;
  border-top: 1px solid var(--silver-100);
  border-bottom: 1px solid var(--silver-100);
  padding: 18px 0;
  background: var(--white);
}
.ticker-track {
  display: inline-flex; gap: 64px; animation: tick 60s linear infinite;
  font-family: var(--font-en); font-size: 12px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--silver-500);
  padding-left: 64px;
}
.ticker-track .dot { color: var(--accent-gold); }
@keyframes tick { to { transform: translateX(-50%);} }

/* Print */
@media print {
  .nav, .footer { display: none; }
}