/* ============================================================
   合同会社Wisteriver — Corporate Site
   Palette: white / deep navy / muted green / subtle gold
   ============================================================ */

:root {
  --navy: #12375a;
  --navy-deep: #0e2a47;
  --navy-soft: #2a5278;
  --green: #3f6b57;
  --green-soft: #527e6a;
  --gold: #b08a44;
  --gold-soft: #c6a363;

  --ink: #1f2a33;
  --ink-soft: #4f5b66;
  --line: #e4e7ea;
  --line-soft: #eef1f3;

  --bg: #ffffff;
  --bg-tint: #f6f8f9;
  --bg-cream: #f7f4ec;
  --bg-navy: #0e2a47;

  --maxw: 1120px;
  --radius: 14px;
  --shadow-sm: 0 1px 2px rgba(14, 42, 71, .05), 0 4px 14px rgba(14, 42, 71, .05);
  --shadow-md: 0 10px 30px rgba(14, 42, 71, .10);

  --serif: "Zen Old Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Noto Sans JP", -apple-system, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
html { overflow-x: clip; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3 { line-height: 1.4; font-weight: 700; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 820px; }

.skip-link {
  position: absolute; left: 12px; top: -48px; z-index: 200;
  background: var(--navy); color: #fff; padding: 10px 16px; border-radius: 8px;
  transition: top .2s;
}
.skip-link:focus { top: 12px; }

:focus-visible { outline: 3px solid var(--gold-soft); outline-offset: 2px; border-radius: 4px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: 999px; font-weight: 700; font-size: .98rem;
  letter-spacing: .02em; transition: transform .15s, background .2s, color .2s, box-shadow .2s;
  white-space: nowrap;
}
.btn .ico { width: 18px; height: 18px; fill: currentColor; flex: none; }
.btn-primary { background: var(--navy); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--navy-deep); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { background: #fff; color: var(--navy); border: 1.5px solid var(--navy); }
.btn-outline:hover { background: var(--navy); color: #fff; transform: translateY(-2px); }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { height: 44px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-family: var(--serif); font-weight: 700; font-size: 1.25rem; color: var(--navy); letter-spacing: .06em; }
.brand-sub { font-size: .68rem; color: var(--ink-soft); letter-spacing: .04em; }

.nav { display: flex; align-items: center; gap: 28px; }
.nav-list { display: flex; align-items: center; gap: 22px; }
.nav-list a { font-size: .92rem; font-weight: 500; color: var(--ink); position: relative; padding: 6px 0; transition: color .2s; }
.nav-list a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--gold); transition: width .25s;
}
.nav-list a:hover { color: var(--navy); }
.nav-list a:hover::after { width: 100%; }

.nav-tel { display: flex; flex-direction: column; align-items: flex-end; line-height: 1.15; padding-left: 18px; border-left: 1px solid var(--line); }
.nav-tel-label { font-size: .64rem; color: var(--ink-soft); letter-spacing: .04em; }
.nav-tel-num { font-family: var(--sans); font-weight: 700; font-size: 1.02rem; color: var(--navy); letter-spacing: .01em; }

.nav-toggle { display: none; width: 44px; height: 44px; position: relative; }
.nav-toggle span {
  position: absolute; left: 10px; right: 10px; height: 2px; background: var(--navy);
  transition: transform .3s, opacity .2s; border-radius: 2px;
}
.nav-toggle span:nth-child(1) { top: 15px; }
.nav-toggle span:nth-child(2) { top: 21px; }
.nav-toggle span:nth-child(3) { top: 27px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(63, 107, 87, .07), transparent 60%),
    linear-gradient(180deg, var(--bg-cream) 0%, #fbfaf6 55%, #ffffff 100%);
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--line-soft) 1px, transparent 1px);
  background-size: 100% 38px; opacity: .5; pointer-events: none;
}
.hero-inner {
  position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px;
  align-items: center; padding: 84px 24px 92px;
}
.hero-eyebrow { font-size: .8rem; letter-spacing: .28em; color: var(--green); font-weight: 700; margin-bottom: 22px; }
.hero-title {
  font-family: var(--serif); font-size: clamp(2.1rem, 5.2vw, 3.6rem); color: var(--navy);
  letter-spacing: .02em; line-height: 1.32; margin-bottom: 28px;
}
.hero-lead { font-size: 1.04rem; color: var(--ink-soft); max-width: 36em; margin-bottom: 36px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-brand { display: flex; justify-content: center; align-items: center; }
.hero-logo { width: min(100%, 400px); filter: drop-shadow(0 18px 40px rgba(14, 42, 71, .12)); }

/* ---------- Section base ---------- */
.section { padding: 92px 0; }
.section-tint { background: var(--bg-tint); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-label { font-size: .78rem; letter-spacing: .26em; color: var(--gold); font-weight: 700; margin-bottom: 14px; }
.section-title { font-family: var(--serif); font-size: clamp(1.6rem, 3.6vw, 2.3rem); color: var(--navy); letter-spacing: .02em; }
.section-title::after { content: ""; display: block; width: 48px; height: 3px; background: var(--green); border-radius: 3px; margin: 20px auto 0; }
.section-desc { margin-top: 22px; color: var(--ink-soft); font-size: 1rem; }
.sp-br { display: none; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.3fr .9fr; gap: 48px; align-items: start; }
.about-lead p + p { margin-top: 20px; }
.about-lead p { color: var(--ink-soft); font-size: 1.02rem; }
.about-facts {
  background: var(--bg-cream); border: 1px solid #ece6d8; border-radius: var(--radius);
  padding: 10px 28px; box-shadow: var(--shadow-sm);
}
.about-facts li { display: flex; flex-direction: column; gap: 2px; padding: 18px 0; border-bottom: 1px solid #e8e1d1; }
.about-facts li:last-child { border-bottom: none; }
.fact-k { font-size: .76rem; letter-spacing: .12em; color: var(--green); font-weight: 700; }
.fact-v { font-size: 1.05rem; color: var(--navy); font-weight: 500; }
.fact-v small { display: block; font-size: .78rem; color: var(--ink-soft); font-weight: 400; letter-spacing: .04em; }

/* ---------- Services cards ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 26px; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: #d6dde3; }
.card-ico {
  width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(140deg, var(--navy), var(--navy-soft)); margin-bottom: 22px;
}
.card-ico svg { width: 28px; height: 28px; stroke: #fff; stroke-width: 1.7; fill: rgba(255,255,255,.14); stroke-linecap: round; stroke-linejoin: round; }
.card h3 { font-size: 1.18rem; color: var(--navy); margin-bottom: 12px; }
.card p { font-size: .94rem; color: var(--ink-soft); }

/* ---------- Strengths ---------- */
.strengths { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.strength {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 34px 34px 38px; box-shadow: var(--shadow-sm); overflow: hidden;
}
.strength::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: linear-gradient(var(--green), var(--green-soft)); }
.strength-no { font-family: var(--serif); font-size: 1.6rem; color: var(--gold); font-weight: 700; letter-spacing: .04em; }
.strength h3 { font-size: 1.2rem; color: var(--navy); margin: 6px 0 12px; }
.strength p { font-size: .96rem; color: var(--ink-soft); }

/* ---------- Flow ---------- */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: flow; }
.flow-step {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 20px; box-shadow: var(--shadow-sm); text-align: center;
}
.flow-step::after {
  content: "›"; position: absolute; right: -14px; top: 50%; transform: translateY(-50%);
  font-size: 1.8rem; color: var(--gold-soft); z-index: 2; line-height: 1;
}
.flow-step:last-child::after { display: none; }
.flow-no { display: inline-block; font-size: .72rem; letter-spacing: .14em; color: var(--green); font-weight: 700; margin-bottom: 10px; }
.flow-step h3 { font-size: 1.05rem; color: var(--navy); margin-bottom: 10px; }
.flow-step p { font-size: .86rem; color: var(--ink-soft); }

/* ---------- Company table ---------- */
.company-wrap { max-width: 760px; margin: 0 auto; }
.company-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.company-table th, .company-table td { text-align: left; padding: 20px 24px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.company-table tr:last-child th, .company-table tr:last-child td { border-bottom: none; }
.company-table th { width: 30%; background: var(--bg-tint); color: var(--navy); font-weight: 700; font-size: .92rem; letter-spacing: .04em; }
.company-table td { color: var(--ink); font-size: .98rem; }
.company-table a { color: var(--navy); font-weight: 700; border-bottom: 1px solid var(--gold-soft); }

/* ---------- Contact ---------- */
.section-contact { background: var(--bg-tint); }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 32px; align-items: stretch; }
.contact-call {
  background: linear-gradient(150deg, var(--navy-deep), var(--navy)); color: #fff;
  border-radius: var(--radius); padding: 40px 34px; box-shadow: var(--shadow-md);
  display: flex; flex-direction: column; justify-content: center;
}
.contact-call-label { font-size: .82rem; letter-spacing: .16em; color: var(--gold-soft); font-weight: 700; }
.contact-call-num { font-family: var(--sans); font-size: clamp(1.35rem, 3.4vw, 1.9rem); font-weight: 700; letter-spacing: .01em; margin: 8px 0 14px; color: #fff; word-break: break-word; }
.contact-call-note { font-size: .84rem; color: rgba(255,255,255,.78); margin-bottom: 26px; }
.contact-call .btn-primary { background: #fff; color: var(--navy); }
.contact-call .btn-primary:hover { background: var(--bg-cream); }

.contact-form-wrap { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow-sm); }
.contact-form-intro { font-size: .92rem; color: var(--ink-soft); margin-bottom: 22px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .88rem; font-weight: 700; color: var(--navy); margin-bottom: 7px; }
.req { font-size: .68rem; background: var(--green); color: #fff; padding: 2px 8px; border-radius: 4px; margin-left: 6px; letter-spacing: .04em; vertical-align: 1px; }
.field input, .field textarea {
  width: 100%; font-family: inherit; font-size: .98rem; color: var(--ink);
  padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 10px; background: #fdfdfd;
  transition: border-color .2s, box-shadow .2s;
}
.field textarea { resize: vertical; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .6; pointer-events: none; }
.field input:focus, .field textarea:focus { border-color: var(--navy-soft); box-shadow: 0 0 0 3px rgba(42, 82, 120, .12); outline: none; }
.field-consent { font-size: .86rem; color: var(--ink-soft); margin-bottom: 20px; }
.field-consent a { color: var(--navy); border-bottom: 1px solid var(--gold-soft); }
.field-consent input { margin-right: 6px; accent-color: var(--navy); }
.form-status { margin-top: 16px; font-size: .9rem; min-height: 1em; }
.form-status.is-error { color: #b3402f; }
.form-status.is-info { color: var(--navy); }
.form-status.is-ok { color: var(--green); }

/* ---------- Privacy ---------- */
.section-privacy { background: #fff; padding-top: 80px; }
.privacy-body p { color: var(--ink-soft); margin-bottom: 18px; font-size: .98rem; }
.privacy-body ul { margin: 0 0 18px; padding-left: 4px; }
.privacy-body li { position: relative; padding-left: 22px; margin-bottom: 10px; color: var(--ink-soft); font-size: .98rem; }
.privacy-body li::before { content: ""; position: absolute; left: 4px; top: 12px; width: 7px; height: 7px; background: var(--green); border-radius: 50%; }

/* ---------- Footer ---------- */
.site-footer { background: var(--bg-navy); color: rgba(255,255,255,.82); }
.footer-inner { display: grid; grid-template-columns: 1fr 1.4fr; gap: 48px; padding: 64px 24px 48px; }
.footer-logo { width: 180px; background: rgba(255,255,255,.96); padding: 18px 22px; border-radius: 12px; }
.footer-tagline { font-family: var(--serif); margin-top: 18px; color: #fff; font-size: 1.05rem; letter-spacing: .02em; }
.footer-info { display: flex; flex-direction: column; gap: 8px; font-size: .92rem; }
.footer-name { font-size: 1.15rem; color: #fff; font-weight: 700; letter-spacing: .04em; margin-bottom: 4px; }
.footer-name span { font-size: .78rem; color: rgba(255,255,255,.6); font-weight: 400; margin-left: 8px; }
.footer-info a { color: #fff; border-bottom: 1px solid rgba(198,163,99,.6); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 16px; }
.footer-nav a { color: rgba(255,255,255,.82); font-size: .88rem; border: none; transition: color .2s; }
.footer-nav a:hover { color: var(--gold-soft); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); }
.footer-bottom .container { padding-top: 22px; padding-bottom: 22px; }
.footer-bottom small { color: rgba(255,255,255,.55); font-size: .8rem; letter-spacing: .04em; }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 48px; height: 48px; border-radius: 50%; background: var(--navy); color: #fff;
  display: grid; place-items: center; box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(10px); transition: opacity .3s, transform .3s, visibility .3s, background .2s;
}
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: var(--navy-deep); }
.to-top svg { width: 22px; height: 22px; stroke: #fff; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Reveal animation ---------- */
.section-head, .card, .strength, .flow-step, .about-grid, .company-wrap, .contact-grid, .privacy-body {
  opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease;
}
.is-visible { opacity: 1 !important; transform: none !important; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .section-head, .card, .strength, .flow-step, .about-grid, .company-wrap, .contact-grid, .privacy-body { opacity: 1; transform: none; }
  * { transition: none !important; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(3, 1fr); }
  .flow-step:nth-child(3)::after { display: none; }
}

@media (max-width: 880px) {
  /* backdrop-filter makes the header a containing block for fixed children,
     which would clip the slide-in drawer — disable it on mobile. */
  .site-header { backdrop-filter: none; -webkit-backdrop-filter: none; background: #fff; }
  .nav-toggle { display: block; }
  .nav {
    position: fixed; top: 72px; right: 0; bottom: 0; width: min(82vw, 340px); z-index: 101;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-left: 1px solid var(--line); box-shadow: -10px 0 40px rgba(14,42,71,.12);
    padding: 18px 26px 32px; transform: translateX(105%); transition: transform .32s ease;
    overflow-y: auto;
  }
  .nav.open { transform: translateX(0); }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-list li { border-bottom: 1px solid var(--line-soft); }
  .nav-list a { display: block; padding: 16px 4px; font-size: 1rem; }
  .nav-list a::after { display: none; }
  .nav-tel { flex-direction: column; align-items: flex-start; gap: 2px; border-left: none; padding: 22px 4px 0; margin-top: 8px; }
  .nav-tel-num { font-size: 1.15rem; white-space: normal; word-break: break-all; }
  body.nav-open { overflow: hidden; }
  .nav-backdrop {
    position: fixed; inset: 72px 0 0 0; background: rgba(14,42,71,.32); z-index: 99;
    opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s;
  }
  .nav-backdrop.show { opacity: 1; visibility: visible; }

  .hero-inner { grid-template-columns: 1fr; gap: 12px; padding: 56px 24px 64px; text-align: center; }
  .hero-eyebrow { letter-spacing: .2em; }
  .hero-lead { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-brand { order: -1; }
  .hero-logo { width: min(64%, 240px); }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .strengths { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 600px) {
  body { font-size: 15.5px; }
  .section { padding: 64px 0; }
  .container { padding: 0 18px; }
  .cards { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; gap: 14px; }
  .flow-step::after { content: "›"; right: 50%; top: auto; bottom: -16px; transform: translateX(50%) rotate(90deg); }
  .flow-step:nth-child(3)::after { display: block; }
  .flow-step:last-child::after { display: none; }
  .brand-sub { display: none; }
  .brand-name { font-size: 1.1rem; }
  .section-head { margin-bottom: 40px; }
  .company-table th, .company-table td { padding: 14px 14px; }
  .company-table th { width: 34%; font-size: .84rem; }
  .contact-form-wrap { padding: 24px 20px; }
  .sp-br { display: inline; }
  .footer-logo { width: 150px; }
}

@media (max-width: 360px) {
  .company-table th, .company-table td { display: block; width: 100%; }
  .company-table th { border-bottom: none; }
}