/**
 * Gantomo SNS — ウェルカムハブ（プラットフォーム統合 LP）
 */

.gs-main--landing {
  max-width: none;
  padding: 0;
}

.gs-hub {
  min-height: calc(100vh - var(--g-crossnav-height, 56px) - 4rem);
  background: transparent;
}

.gs-hub__shell {
  max-width: var(--gs-shell-max);
  margin: 0 auto;
  padding: 2.5rem var(--gs-content-pad) 3rem;
}

.gs-hub__hero {
  text-align: center;
  margin-bottom: 2.5rem;
}

.gs-hub__hero-visual {
  position: relative;
  margin: -0.5rem auto 1.5rem;
  padding: 0;
  max-width: 56rem;
  aspect-ratio: 21 / 7;
  min-height: 10.5rem;
  max-height: 17rem;
  border-radius: var(--gs-radius);
  overflow: hidden;
  border: 1px solid var(--gs-line);
  box-shadow: var(--gs-shadow-md);
}

.gs-hub__hero-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
}

.gs-hub__hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(247, 251, 249, 0.08) 0%, rgba(247, 251, 249, 0.42) 72%, rgba(247, 251, 249, 0.72) 100%),
    linear-gradient(90deg, rgba(42, 157, 111, 0.06) 0%, transparent 35%, transparent 65%, rgba(124, 159, 212, 0.06) 100%);
}

.gs-hub__hero-visual--fallback {
  background:
    linear-gradient(180deg, #f7fbf9 0%, #ffffff 100%),
    radial-gradient(ellipse 60% 100% at 15% 50%, rgba(42, 157, 111, 0.14), transparent 60%),
    radial-gradient(ellipse 50% 90% at 85% 40%, rgba(124, 159, 212, 0.12), transparent 55%),
    radial-gradient(ellipse 40% 80% at 50% 0%, rgba(217, 123, 92, 0.08), transparent 50%);
}

.gs-hub__hero-visual--fallback::after {
  position: static;
  display: block;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 720 88' aria-hidden='true'%3E%3Cpath d='M0 72 C180 52 300 84 360 68 C420 52 540 80 720 62 L720 88 L0 88 Z' fill='%23eef6f2' fill-opacity='0.75'/%3E%3Cpath d='M360 44c-5.5-4.5-9.5-9-9.5-13.5a5.5 5.5 0 0 1 10-3.2 5.5 5.5 0 0 1 10 3.2c0 4.5-4 9-10.5 13.5z' fill='%232a9d6f' fill-opacity='0.08'/%3E%3C/svg%3E") center bottom / cover no-repeat;
}

.gs-hub__eyebrow {
  margin: 0 0 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gs-ink-muted);
}

.gs-hub__title {
  margin: 0 auto 1rem;
  max-width: 18ch;
  font-size: clamp(1.85rem, 4.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--gs-ink);
}

.gs-hub__lead {
  margin: 0 auto 1.75rem;
  max-width: 36rem;
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--gs-ink-muted);
}

.gs-hub__stats {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  margin: 0 0 1.75rem;
  padding: 0.85rem 1.25rem;
  background: var(--gs-surface);
  border: 1px solid var(--gs-line);
  border-radius: var(--gs-radius-pill);
  box-shadow: var(--gs-shadow);
}

.gs-hub__stat {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.gs-hub__stat dt {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gs-ink-muted);
}

.gs-hub__stat dd {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--gs-ink);
}

.gs-hub__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* --- 3本柱カード --- */
.gs-hub__pillars {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

.gs-hub__pillars--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.gs-hub__pillars--4 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.gs-pillar {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  background: var(--gs-surface);
  border: 1px solid var(--gs-line);
  border-radius: var(--gs-radius);
  box-shadow: var(--gs-shadow-md);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.gs-pillar:hover {
  transform: translateY(-2px);
  box-shadow: var(--gs-shadow-lg);
}

.gs-pillar__main {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 1.5rem 1.35rem 1.25rem;
  text-decoration: none;
  color: inherit;
}

.gs-pillar__main:hover {
  color: inherit;
}

.gs-pillar--sns .gs-pillar__main {
  background: linear-gradient(160deg, var(--gs-pillar-sns-soft) 0%, var(--gs-surface) 55%);
  border-top: 3px solid var(--gs-pillar-sns);
}

.gs-pillar--forum .gs-pillar__main {
  background: linear-gradient(160deg, var(--gs-pillar-forum-soft) 0%, var(--gs-surface) 55%);
  border-top: 3px solid var(--gs-pillar-forum);
}

.gs-pillar--news .gs-pillar__main {
  background: linear-gradient(160deg, var(--gs-pillar-news-soft) 0%, var(--gs-surface) 55%);
  border-top: 3px solid var(--gs-pillar-news);
}

.gs-pillar--chat .gs-pillar__main {
  background: linear-gradient(160deg, var(--gs-pillar-chat-soft) 0%, var(--gs-surface) 55%);
  border-top: 3px solid var(--gs-pillar-chat);
}

.gs-pillar__icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 0.75rem;
}

.gs-pillar__badge {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: var(--gs-radius-pill);
  background: rgba(15, 20, 25, 0.05);
  color: var(--gs-ink-muted);
}

.gs-pillar__title {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.gs-pillar__desc {
  margin: 0 0 1rem;
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--gs-ink-muted);
}

.gs-pillar__cta {
  font-size: 0.88rem;
  font-weight: 700;
}

.gs-pillar--sns .gs-pillar__cta { color: var(--gs-pillar-sns); }
.gs-pillar--forum .gs-pillar__cta { color: var(--gs-pillar-forum); }
.gs-pillar--news .gs-pillar__cta { color: var(--gs-pillar-news); }
.gs-pillar--chat .gs-pillar__cta { color: var(--gs-pillar-chat); }

.gs-pillar__links {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1.35rem;
  border-top: 1px solid var(--gs-line);
  background: rgba(15, 20, 25, 0.02);
}

.gs-pillar__links a {
  flex: 1;
  padding: 0.45rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  color: var(--gs-ink);
  background: var(--gs-surface);
  border: 1px solid var(--gs-line);
  border-radius: var(--gs-radius-sm);
  transition: background 0.15s ease;
}

.gs-pillar__links a:hover {
  background: var(--gs-bg);
  color: var(--gs-pillar-sns);
}

/* --- 最新ニュース --- */
.gs-hub__news {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--gs-surface);
  border: 1px solid var(--gs-line);
  border-radius: var(--gs-radius);
  box-shadow: var(--gs-shadow-md);
}

.gs-hub__news-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--gs-line);
}

.gs-hub__news-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
}

.gs-hub__news-archive {
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
}

.gs-news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.gs-news-list__item + .gs-news-list__item {
  margin-top: 0.35rem;
}

.gs-news-list__link {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.65rem 0.75rem;
  border-radius: var(--gs-radius-sm);
  text-decoration: none;
  color: inherit;
  transition: background 0.12s ease;
}

.gs-news-list__link:hover {
  background: var(--gs-bg);
}

.gs-news-list__date {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gs-ink-muted);
  white-space: nowrap;
}

.gs-news-list__title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--gs-ink);
  line-height: 1.4;
}

.gs-news-list__more {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
}

/* --- 使い分けガイド --- */
.gs-hub__guide {
  padding: 1.75rem;
  background: var(--gs-surface);
  border: 1px solid var(--gs-line);
  border-radius: var(--gs-radius);
  box-shadow: var(--gs-shadow);
}

.gs-hub__guide-title {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  color: var(--gs-ink-muted);
}

.gs-hub__guide-grid {
  display: grid;
  gap: 1rem;
}

.gs-hub__guide-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.gs-hub__guide-grid--4 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.gs-guide-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: var(--gs-radius-sm);
  background: var(--gs-bg);
}

.gs-guide-item__icon {
  font-size: 1.35rem;
  line-height: 1;
  flex-shrink: 0;
}

.gs-guide-item h3 {
  margin: 0 0 0.25rem;
  font-size: 0.92rem;
  font-weight: 700;
}

.gs-guide-item p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--gs-ink-muted);
  line-height: 1.45;
}

.gs-guide-item--sns { border-left: 3px solid var(--gs-pillar-sns); }
.gs-guide-item--forum { border-left: 3px solid var(--gs-pillar-forum); }
.gs-guide-item--news { border-left: 3px solid var(--gs-pillar-news); }
.gs-guide-item--chat { border-left: 3px solid var(--gs-pillar-chat); }

@media (max-width: 900px) {
  .gs-hub__pillars--3,
  .gs-hub__pillars--4,
  .gs-hub__guide-grid--3,
  .gs-hub__guide-grid--4 {
    grid-template-columns: 1fr;
  }

  .gs-hub__title {
    max-width: none;
  }
}

@media (max-width: 768px) {
  .gs-hub__shell {
    padding-top: 1.5rem;
    padding-bottom: 2rem;
  }

  .gs-hub__hero-visual {
    aspect-ratio: 16 / 9;
    min-height: 9rem;
    max-height: 14rem;
  }

  .gs-hub__stats {
    flex-direction: column;
    align-items: center;
    border-radius: var(--gs-radius);
  }

  .gs-news-list__link {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

/* ===== 大規模 SNS ハブ ===== */
.gs-hub--sns {
  background: transparent;
}

.gs-hub__hero--sns .gs-hub__title {
  max-width: 14em;
  font-size: clamp(2rem, 5vw, 2.85rem);
  letter-spacing: 0.06em;
}

.gs-hub__section-title {
  margin: 0 0 1.25rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gs-ink);
}

.gs-hub__actions {
  margin: 0 0 2.5rem;
}

.gs-hub__action-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--gs-line);
  border: 1px solid var(--gs-line);
  border-radius: var(--gs-radius);
  overflow: hidden;
}

.gs-action {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.35rem 1.4rem;
  background: var(--gs-surface);
  border: none;
  border-radius: 0;
  box-shadow: none;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s ease;
}

.gs-action:hover {
  background: var(--gs-bg-elevated);
  color: inherit;
}

.gs-action__title {
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--gs-ink);
}

.gs-action__desc {
  flex: 1;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--gs-ink-muted);
}

.gs-action__cta {
  margin-top: 0.35rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--gs-accent);
}

.gs-action--feed,
.gs-action--groups,
.gs-action--members,
.gs-action--forum,
.gs-action--news,
.gs-action--chat {
  border-top: none;
}

.gs-hub__flow {
  margin: 0 0 2.5rem;
  padding: 1.75rem 1.5rem;
  background: var(--gs-surface);
  border: 1px solid var(--gs-line);
  border-radius: var(--gs-radius);
}

.gs-hub__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.gs-hub__steps li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.gs-hub__step-num {
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--gs-accent-soft);
  color: var(--gs-accent-deep);
  font-size: 0.85rem;
  font-weight: 600;
}

.gs-hub__steps h3 {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
  font-weight: 700;
}

.gs-hub__steps p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.5;
  color: var(--gs-ink-muted);
}

.gs-hub__secondary {
  text-align: center;
  margin-bottom: 1rem;
}

.gs-hub__secondary-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  font-weight: 700;
  color: var(--gs-ink-muted);
  text-decoration: none;
  border-radius: var(--gs-radius-pill);
}

.gs-hub__secondary-link:hover {
  color: var(--gs-accent);
  background: var(--gs-accent-soft);
}

.gs-btn--text {
  background: transparent;
  color: var(--gs-accent);
  border: none;
  box-shadow: none;
  font-weight: 700;
}

.gs-btn--text:hover {
  background: var(--gs-accent-soft);
  color: var(--gs-accent-hover);
}

@media (max-width: 900px) {
  .gs-hub__action-grid,
  .gs-hub__steps {
    grid-template-columns: 1fr;
  }
}