/* ==========================================================
   soneru corporate site — light minimal
   ========================================================== */

:root {
  --color-text: #14161a;
  --color-text-sub: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f6f8;
  --color-accent: #1b1e24;
  --color-accent-dark: #000000;
  --color-eyebrow: #9aa0a8;
  --color-border: #e7e9ed;
  /* うっすらモノトーングラデーション */
  --grad-dark: linear-gradient(155deg, #34383f 0%, #16181d 100%);
  --grad-hero: radial-gradient(ellipse 70% 55% at 82% -5%, rgba(20, 22, 26, 0.06), transparent 60%),
    linear-gradient(180deg, #f7f8fa 0%, #ffffff 55%);
  --grad-alt: linear-gradient(180deg, #f6f7f9 0%, #f1f2f5 100%);
  --max-width: 1080px;
  --font-ja: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  font-family: var(--font-ja);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.pc-only { display: inline; }

/* ---------- header ---------- */

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: inline-flex;
  align-items: center;
}

.logo-img {
  height: 28px;
  width: auto;
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
  font-size: 0.92rem;
  font-weight: 500;
}

.nav a:not(.nav-cta) {
  position: relative;
  padding: 4px 0;
  color: var(--color-text-sub);
  transition: color 0.2s;
}

.nav a:not(.nav-cta):hover { color: var(--color-text); }

.nav-cta {
  padding: 9px 20px;
  border-radius: 999px;
  background: var(--grad-dark);
  color: #fff;
  transition: opacity 0.2s;
}

.nav-cta:hover { opacity: 0.82; }

.nav-toggle { display: none; }

/* ---------- hero ---------- */

.hero {
  padding: 180px 0 120px;
  background: var(--grad-hero);
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-eyebrow);
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
  margin-bottom: 28px;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--color-text-sub);
  margin-bottom: 40px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--grad-dark);
  color: #fff;
  box-shadow: 0 6px 18px rgba(20, 22, 26, 0.18);
}

.btn-primary:hover { opacity: 0.9; }

.btn-ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.6);
}

.btn-ghost:hover { border-color: var(--color-text); }

.btn-lg { padding: 18px 48px; font-size: 1.05rem; }

/* ---------- sections ---------- */

.section { padding: 110px 0; }
.section-alt { background: var(--grad-alt); }

.section-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-eyebrow);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 56px;
}

/* ---------- services ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.card {
  padding: 40px 32px;
  border: 1px solid var(--color-border);
  border-radius: 16px;
  background: #fff;
  transition: box-shadow 0.25s, transform 0.25s;
}

.card:hover {
  box-shadow: 0 16px 40px rgba(20, 22, 26, 0.08);
  border-color: #dcdfe4;
  transform: translateY(-4px);
}

.card-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 24px;
  color: var(--color-text);
  opacity: 0.85;
}

.card-icon svg { width: 100%; height: 100%; }

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.card p {
  font-size: 0.93rem;
  color: var(--color-text-sub);
}

/* ---------- works ---------- */

.works-lead {
  color: var(--color-text-sub);
  margin: -36px 0 44px;
}

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

.work {
  display: flex;
  gap: 20px;
  padding: 28px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 16px;
  transition: box-shadow 0.25s, transform 0.25s;
}

.work:hover {
  box-shadow: 0 16px 40px rgba(20, 22, 26, 0.08);
  border-color: #dcdfe4;
  transform: translateY(-4px);
}

.work-icon {
  width: 80px;
  height: 80px;
  border-radius: 18px;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(20, 22, 26, 0.1);
}

.work-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.work-body p {
  font-size: 0.9rem;
  color: var(--color-text-sub);
  margin-bottom: 14px;
}

.work-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
}

.work-link span { transition: transform 0.2s; }
.work-link:hover span { transform: translate(2px, -2px); }

.works-more {
  margin-top: 36px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
}

.works-more a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--color-text-sub);
  transition: color 0.2s;
}

.works-more a:hover { color: var(--color-text); }

/* ---------- strengths ---------- */

.strengths {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px 40px;
}

.strength-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #c7cbd1;
  margin-bottom: 10px;
  font-feature-settings: "tnum";
}

.strength h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.strength p {
  font-size: 0.93rem;
  color: var(--color-text-sub);
}

/* ---------- company ---------- */

.company-table {
  max-width: 720px;
  border-top: 1px solid var(--color-border);
}

.company-table > div {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 16px;
  padding: 20px 8px;
  border-bottom: 1px solid var(--color-border);
}

.company-table dt {
  font-weight: 600;
  color: var(--color-text-sub);
  font-size: 0.93rem;
}

.company-table dd { font-size: 0.95rem; }

/* ---------- contact ---------- */

.section-contact {
  background:
    radial-gradient(ellipse 60% 70% at 50% 120%, rgba(20, 22, 26, 0.06), transparent 60%),
    linear-gradient(180deg, #ffffff 0%, #f2f3f5 100%);
}

.contact-inner { text-align: center; }

.contact-inner .section-title { margin-bottom: 20px; }

.contact-lead {
  color: var(--color-text-sub);
  margin-bottom: 36px;
}

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-footer { height: 24px; }

.footer-links {
  display: flex;
  gap: 24px;
  font-size: 0.88rem;
  font-weight: 500;
}

.footer-links a {
  color: var(--color-text-sub);
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--color-text); }

.footer small {
  color: var(--color-text-sub);
  font-size: 0.8rem;
}

/* ---------- reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- responsive ---------- */

@media (max-width: 768px) {
  .pc-only { display: none; }

  .nav {
    position: fixed;
    top: 64px;
    right: 0;
    left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: 8px 24px 20px;
    display: none;
  }

  .nav.is-open { display: flex; }

  .nav a:not(.nav-cta) { padding: 14px 0; }

  .nav-cta {
    margin-top: 12px;
    text-align: center;
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
  }

  .nav-toggle span {
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.25s;
  }

  .nav-toggle.is-open span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

  .hero { padding: 140px 0 80px; }
  .section { padding: 72px 0; }
  .section-title { margin-bottom: 36px; }

  .cards, .strengths, .works { grid-template-columns: 1fr; }

  .company-table > div { grid-template-columns: 110px 1fr; }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
  }
}