/* =========================================================
   SYNSETECH — 株式会社シンセテック
   コーポレートサイト
   ========================================================= */

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

:root {
  --c-text: #1a2438;
  --c-text-sub: #5a6a82;
  --c-text-mute: #8a98ac;
  --c-bg: #ffffff;
  --c-bg-alt: #f6f8fb;
  --c-bg-soft: #eef2f7;
  --c-border: #dde4ed;
  --c-border-light: #eef2f7;
  --c-accent: #1a3a6e;
  --c-accent-hover: #14315e;
  --c-accent-soft: #e8eef7;

  /* 日本語コーポレートサイト標準フォントスタック */
  --font-sans:
    'Noto Sans JP',
    'ヒラギノ角ゴ ProN', 'Hiragino Kaku Gothic ProN',
    'メイリオ', Meiryo,
    'ＭＳ Ｐゴシック',
    'Yu Gothic Medium', 'Yu Gothic',
    sans-serif;

  --font-serif:
    'Noto Serif JP',
    'ヒラギノ明朝 ProN', 'Hiragino Mincho ProN',
    'Yu Mincho', 'YuMincho',
    'ＭＳ Ｐ明朝',
    serif;

  --max: 1100px;
  --gutter: clamp(1.25rem, 3.5vw, 2.5rem);
  --header-h: 70px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--c-text);
  background: var(--c-bg);
  font-size: 15px;
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'palt';  /* プロポーショナル詰め */
  text-rendering: optimizeLegibility;
}

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

::selection { background: var(--c-accent-soft); color: var(--c-accent); }

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* =========================================================
   Header
   ========================================================= */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.topbar.is-transparent {
  background: rgba(255, 255, 255, 0);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}
.topbar.is-transparent .brand { color: #fff; }
.topbar.is-transparent .brand-jp { color: rgba(255, 255, 255, 0.65); }
.topbar.is-transparent .nav-links a { color: rgba(255, 255, 255, 0.85); }
.topbar.is-transparent .nav-links a:hover { color: #fff; }
.topbar.is-transparent .nav-links a::after { background: #fff; }
.topbar.is-transparent .nav-cta {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff !important;
}
.topbar.is-transparent .nav-cta:hover {
  background: rgba(255, 255, 255, 0.25);
}
.topbar.is-transparent .menu-toggle { color: #fff; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  color: var(--c-accent);
}
.brand-jp {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--c-text-sub);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}
.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--c-text);
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--c-accent); }
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--c-accent);
  transition: width 0.25s ease;
}
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  background: var(--c-accent);
  color: #fff !important;
  padding: 0.55rem 1.1rem;
  border-radius: 2px;
  font-size: 0.85rem !important;
  transition: background 0.2s ease;
}
.nav-cta:hover { background: var(--c-accent-hover); }
.nav-cta::after { display: none !important; }

.menu-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 0.5rem;
  color: var(--c-text);
  cursor: pointer;
}

/* =========================================================
   Hero Slideshow
   ========================================================= */
.hero-slideshow {
  position: relative;
  width: 100%;
  height: clamp(420px, 70vh, 680px);
  overflow: hidden;
  background: #0d1a2e;
}

.slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 1s ease, visibility 0s 1s;
  z-index: 1;
}
.slide.is-active {
  opacity: 1;
  visibility: visible;
  transition: opacity 1s ease, visibility 0s 0s;
  z-index: 2;
}

.slide > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.05);
  transition: transform 8s ease-out;
}
.slide.is-active > img {
  transform: scale(1);
}

.slide-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(13, 26, 46, 0.82) 0%, rgba(13, 26, 46, 0.45) 50%, rgba(13, 26, 46, 0.25) 100%);
  z-index: 1;
}

.slide-content {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--header-h);
  color: #fff;
}

.slide-label {
  margin: 0 0 1rem;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
}

.slide-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.7rem, 4vw, 3rem);
  line-height: 1.35;
  letter-spacing: 0.02em;
  margin: 0 0 1.2rem;
  max-width: 18em;
}
.slide-title strong {
  color: #8cc4ff;
  font-weight: 500;
}

.slide-text {
  margin: 0 0 1.8rem;
  font-size: clamp(0.88rem, 1.3vw, 1.02rem);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.8);
  max-width: 36em;
}

.slide-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  font-size: 0.88rem;
  font-weight: 500;
  background: #fff;
  color: var(--c-accent);
  border: 0;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.25s ease, transform 0.25s ease;
  width: fit-content;
}
.slide-btn:hover {
  background: #e8eef7;
  transform: translateY(-1px);
}

/* Progress bar */
.slide-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.15);
  z-index: 10;
}
.slide-progress-bar {
  height: 100%;
  width: 0%;
  background: #fff;
}

/* Indicators */
.slide-indicators {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}
.indicator {
  width: 36px;
  height: 3px;
  border: 0;
  padding: 0;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transition: background 0.3s ease;
  border-radius: 2px;
}
.indicator.is-active {
  background: #fff;
}

/* Arrows */
.slide-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease;
  backdrop-filter: blur(4px);
}
.slide-arrow:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
}
.slide-arrow--prev { left: clamp(12px, 2vw, 30px); }
.slide-arrow--next { right: clamp(12px, 2vw, 30px); }

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  font-size: 0.88rem;
  font-weight: 500;
  border: 1px solid var(--c-border);
  background: #fff;
  color: var(--c-text);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}
.btn-primary {
  background: var(--c-accent);
  color: #fff;
  border-color: var(--c-accent);
}
.btn-primary:hover {
  background: var(--c-accent-hover);
  border-color: var(--c-accent-hover);
  color: #fff;
}
.btn .arrow { transition: transform 0.2s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* =========================================================
   Section
   ========================================================= */
.section {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
}
.section--alt { background: var(--c-bg-alt); }

.section-head {
  margin-bottom: clamp(2rem, 4vw, 3rem);
  text-align: center;
}
.section-head .en {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--c-accent);
  font-weight: 700;
  margin-bottom: 0.6rem;
}
.section-head h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.5rem, 2.6vw, 1.9rem);
  letter-spacing: 0.04em;
  margin: 0 0 0.8rem;
  color: var(--c-text);
}
.section-head h2::after {
  content: '';
  display: block;
  width: 32px;
  height: 2px;
  background: var(--c-accent);
  margin: 0.9rem auto 0;
}
.section-head .desc {
  max-width: 48em;
  margin: 1.2rem auto 0;
  color: var(--c-text-sub);
  font-size: 0.95rem;
  line-height: 1.95;
}

/* =========================================================
   Services
   ========================================================= */
.services {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

.service-card {
  background: #fff;
  border: 1px solid var(--c-border);
  padding: clamp(1.5rem, 3vw, 2.2rem);
  border-radius: 2px;
  transition: all 0.25s ease;
  display: grid;
  grid-template-rows: auto auto auto 1fr;
  gap: 0.8rem;
}
.service-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26, 58, 110, 0.08);
}

.service-card .num {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--c-accent);
}
.service-card .num::after {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--c-accent);
}

.service-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  margin: 0;
  letter-spacing: 0.02em;
}
.service-card .en-sub {
  font-size: 0.75rem;
  color: var(--c-text-mute);
  letter-spacing: 0.1em;
  font-weight: 400;
}

.service-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--c-text-sub);
  line-height: 1.85;
}

.service-card ul {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0.8rem 0 0;
  border-top: 1px dashed var(--c-border);
  display: grid;
  gap: 0.4rem;
}
.service-card ul li {
  font-size: 0.85rem;
  color: var(--c-text-sub);
  padding-left: 1rem;
  position: relative;
}
.service-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  background: var(--c-accent);
  border-radius: 50%;
}

/* =========================================================
   Showcase
   ========================================================= */
.showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.showcase + .showcase { margin-top: clamp(3rem, 6vw, 5rem); }
.showcase--reverse .showcase-text { order: 2; }

.showcase-image {
  border: 1px solid var(--c-border);
  border-radius: 2px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: #fff;
}
.showcase-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.showcase-text .label {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--c-accent);
  font-weight: 700;
  margin: 0 0 1rem;
}
.showcase-text h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 500;
  margin: 0 0 1rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
}
.showcase-text p {
  margin: 0 0 0.8rem;
  font-size: 0.95rem;
  color: var(--c-text-sub);
  line-height: 1.95;
}

.spec-table {
  margin-top: 1.5rem;
  width: 100%;
  border-collapse: collapse;
  border-top: 1px solid var(--c-border);
}
.spec-table tr { border-bottom: 1px solid var(--c-border); }
.spec-table th,
.spec-table td {
  text-align: left;
  padding: 0.8rem 0.4rem;
  font-size: 0.88rem;
  vertical-align: top;
}
.spec-table th {
  width: 30%;
  font-weight: 500;
  color: var(--c-accent);
  letter-spacing: 0.05em;
  font-size: 0.82rem;
}
.spec-table td { color: var(--c-text-sub); }

/* =========================================================
   News
   ========================================================= */
.news-list {
  max-width: 900px;
  margin: 0 auto;
  border-top: 1px solid var(--c-border);
}
.news-item {
  display: grid;
  grid-template-columns: 130px 110px 1fr auto;
  gap: 1.5rem;
  padding: 1.4rem 0.4rem;
  border-bottom: 1px solid var(--c-border);
  align-items: center;
  transition: background 0.2s ease;
}
.news-item:hover { background: var(--c-bg-alt); }
.news-item time {
  font-size: 0.85rem;
  color: var(--c-text-sub);
  letter-spacing: 0.04em;
}
.news-item .tag {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  background: var(--c-accent-soft);
  color: var(--c-accent);
  border-radius: 2px;
  text-align: center;
  font-weight: 500;
  width: fit-content;
}
.news-item h3 {
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0;
  line-height: 1.6;
  color: var(--c-text);
}
.news-item .arrow-link {
  font-size: 0.78rem;
  color: var(--c-text-mute);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  transition: color 0.2s ease, gap 0.2s ease;
}
.news-item:hover .arrow-link {
  color: var(--c-accent);
  gap: 0.7rem;
}

/* =========================================================
   Blog
   ========================================================= */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

.blog-card {
  background: #fff;
  border: 1px solid var(--c-border);
  padding: 1.6rem;
  border-radius: 2px;
  transition: all 0.25s ease;
}
.blog-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26, 58, 110, 0.08);
}
.blog-card .meta {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 0 0 0.8rem;
  font-size: 0.78rem;
  color: var(--c-text-mute);
}
.blog-card .meta .cat {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  background: var(--c-accent-soft);
  color: var(--c-accent);
  letter-spacing: 0.08em;
  font-weight: 500;
  border-radius: 2px;
}
.blog-card h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  margin: 0 0 0.6rem;
  line-height: 1.5;
}
.blog-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--c-text-sub);
  line-height: 1.8;
}

/* =========================================================
   Company
   ========================================================= */
.company-image-wrap {
  max-width: 900px;
  margin: 0 auto;
  border: 1px solid var(--c-border);
  background: #fff;
  border-radius: 2px;
  overflow: hidden;
}
.company-image-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.company-note {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--c-text-mute);
}

/* =========================================================
   Contact
   ========================================================= */
.contact-grid {
  max-width: 700px;
  margin: 0 auto;
}

.contact-info {
  background: #fff;
  border: 1px solid var(--c-border);
  padding: 1.8rem;
  border-radius: 2px;
}
.contact-info h3 {
  font-size: 0.92rem;
  margin: 0 0 1rem;
  color: var(--c-accent);
  font-weight: 700;
  letter-spacing: 0.06em;
}
.contact-info dl {
  margin: 0;
  display: grid;
  gap: 1rem;
}
.contact-info dt {
  font-size: 0.78rem;
  color: var(--c-text-mute);
  letter-spacing: 0.1em;
  margin-bottom: 0.2rem;
}
.contact-info dd {
  margin: 0;
  font-size: 0.92rem;
  color: var(--c-text);
}
.contact-info dd a:hover { color: var(--c-accent); }

.contact-form {
  background: #fff;
  border: 1px solid var(--c-border);
  padding: 1.8rem;
  border-radius: 2px;
  display: grid;
  gap: 1.1rem;
}
.contact-form .row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.contact-form label {
  display: grid;
  grid-template-rows: auto auto;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--c-text);
  font-weight: 500;
}
.contact-form .label-text {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.contact-form .req {
  display: inline-block;
  font-size: 0.65rem;
  background: #d24343;
  color: #fff;
  padding: 0.05rem 0.4rem;
  border-radius: 2px;
  letter-spacing: 0.04em;
  font-weight: 500;
  line-height: 1.4;
  flex-shrink: 0;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  font: inherit;
  font-size: 0.92rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--c-border);
  border-radius: 2px;
  background: #fff;
  color: var(--c-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-soft);
}
.contact-form textarea { resize: vertical; min-height: 130px; }
.contact-form .submit-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.4rem;
}
.form-status {
  margin: 0;
  font-size: 0.85rem;
  min-height: 1.4em;
  color: var(--c-text-sub);
}

/* =========================================================
   Footer
   ========================================================= */
footer.foot {
  background: #1a2438;
  color: #c8d1e0;
  padding: 2.5rem 0 1.5rem;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2rem;
  align-items: start;
  padding-bottom: 1.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.foot-brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.05em;
  color: #fff;
  margin-bottom: 0.3rem;
}
.foot-brand-jp {
  font-size: 0.78rem;
  color: #8a98ac;
  margin-bottom: 0.8rem;
}
.foot p { margin: 0; font-size: 0.82rem; line-height: 1.85; }
.foot h4 {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: #fff;
  margin: 0 0 0.8rem;
  font-weight: 700;
}
.foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.4rem; }
.foot ul a {
  font-size: 0.85rem;
  color: #c8d1e0;
  transition: color 0.2s ease;
}
.foot ul a:hover { color: #fff; }
.foot-bottom {
  padding-top: 1.5rem;
  font-size: 0.75rem;
  color: #8a98ac;
  text-align: center;
  letter-spacing: 0.08em;
}

/* =========================================================
   Reveal
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

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

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .menu-toggle { display: inline-flex; }

  .nav-links.is-open {
    display: flex;
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    padding: 0.5rem var(--gutter) 1rem;
    gap: 0;
  }
  .nav-links.is-open a {
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--c-border-light);
    width: 100%;
  }
  .nav-links.is-open a:last-child { border-bottom: 0; margin-top: 0.6rem; }

  .hero-slideshow { height: clamp(360px, 60vh, 520px); }
  .slide-arrow { display: none; }
  .slide-title { font-size: clamp(1.5rem, 5.5vw, 2rem); }

  .hero-grid { grid-template-columns: 1fr; }
  .hero-image { order: -1; max-width: 480px; margin: 0 auto; }

  .services { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }

  .showcase, .showcase--reverse { grid-template-columns: 1fr; }
  .showcase--reverse .showcase-text { order: 0; }

  .news-item {
    grid-template-columns: auto auto;
    grid-template-rows: auto auto auto;
    gap: 0.4rem 1rem;
  }
  .news-item time { grid-column: 1; grid-row: 1; }
  .news-item .tag { grid-column: 2; grid-row: 1; justify-self: start; }
  .news-item h3 { grid-column: 1 / -1; grid-row: 2; }
  .news-item .arrow-link { grid-column: 1 / -1; grid-row: 3; }

  .contact-form .row { grid-template-columns: 1fr; }

  .foot-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}