/* =========================================================
   HYDROCORE — 事例紹介 一覧
   ========================================================= */

:root {
  --ink: #121822;
  --ink-soft: #3A4453;
  --line: #E1E5EC;
  --line-soft: #EAEDF1;
  --paper: #F3F5F8;
  --paper-alt: #FFFFFF;
  --hero-bg: #E7EAEF;
  --hero-grid: #D3D9E1;
  --blue: #2F6BD6;
  --blue-deep: #12305F;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --sans: 'Zen Kaku Gothic New', 'Hiragino Sans', sans-serif;
  --gap-page: clamp(20px, 5vw, 88px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding-left: var(--gap-page);
  padding-right: var(--gap-page);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb-bar__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 32px 8px;
}
.breadcrumb {
  margin: 0;
}
.breadcrumb__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #5B6472;
}
.breadcrumb__item + .breadcrumb__item::before {
  content: '› ';
  color: #5B6472;
  font-size: 14px;
}
.breadcrumb__item a {
  color: #5B6472;
  text-decoration: none;
}
.breadcrumb__item a:hover {
  color: var(--blue);
}

/* ---------- Page header ---------- */
.page-header {
  position: relative;
  background: var(--hero-bg);
  padding: 0 0 clamp(40px, 7vw, 60px);
  overflow: hidden;
}
.page-header__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hero-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.7;
  pointer-events: none;
}
.page-header__inner { position: relative; padding-top: clamp(28px, 4vw, 40px); }
.page-header__title {
  margin: 0;
  font-weight: 900;
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1.2;
  letter-spacing: 0.01em;
}
.page-header__sub {
  margin: 14px 0 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: #5B6472;
}

/* ---------- Filter ---------- */
.filter-section {
  padding: clamp(28px, 5vw, 40px) 0 0;
  background: var(--paper-alt);
  border-bottom: 1px solid var(--line);
}
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: clamp(20px, 4vw, 28px);
}
.filter-btn {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #5B6472;
  background: transparent;
  border: 1px solid #C3CAD5;
  border-radius: 2px;
  padding: 5px 12px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.filter-btn:hover {
  color: var(--blue);
  border-color: var(--blue);
}
.filter-btn.is-active {
  color: var(--paper-alt);
  background: var(--blue);
  border-color: var(--blue);
}

/* ---------- Works grid ---------- */
.works-section {
  padding: clamp(40px, 7vw, 64px) 0 clamp(64px, 10vw, 96px);
}
.works-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 36px);
}
@media (min-width: 640px) {
  .works-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Work card ---------- */
.work-card {
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}
.work-card:hover {
  box-shadow: 0 8px 28px rgba(18,24,34,0.10);
  transform: translateY(-3px);
}
.work-card[hidden] { display: none; }

.work-card__link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.work-card__media {
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #DCE1E8;
}
.work-card__media img,
.work-card__media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.work-card:hover .work-card__media img,
.work-card:hover .work-card__media video {
  transform: scale(1.04);
}

.work-card__body {
  padding: 20px 22px 24px;
}
.work-card__cats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}
.cat-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 2px;
  padding: 2px 7px;
}
.work-card__title {
  margin: 0;
  font-weight: 900;
  font-size: clamp(16px, 2.4vw, 20px);
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.work-card__sub {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

/* ---------- Empty state ---------- */
.works-empty {
  margin: 48px 0 0;
  text-align: center;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: #8A94A2;
}