/* ============================================
   SkyCetus 2.0 — 天鲸星系专页
   底层：安静、诗意、哲学感
   ============================================ */

/* Hero */
.gs-hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.gs-hero-bg { position: absolute; inset: 0; }

.gs-stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(2px 2px at 20px 30px, rgba(255,255,255,0.12), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.08), transparent),
    radial-gradient(2px 2px at 200px 50px, rgba(139,122,212,0.15), transparent),
    radial-gradient(1px 1px at 160px 120px, rgba(212,175,55,0.1), transparent);
  background-size: 250px 200px;
  animation: starTwinkle 10s ease-in-out infinite alternate;
}

@keyframes starTwinkle {
  0% { opacity: 0.5; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

.gs-nebula {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(139, 122, 212, 0.12), transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(212, 175, 55, 0.08), transparent 50%);
}

.gs-hero-content {
  position: relative;
  z-index: 1;
  padding: 2rem;
}

.gs-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 200;
  background: linear-gradient(135deg, var(--white) 30%, var(--purple-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.gs-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--white-50);
  margin-bottom: 1.5rem;
}

.gs-intro {
  font-size: 0.95rem;
  color: var(--white-40);
  line-height: 2;
}

/* Spiral Section */
.spiral-section {
  padding: var(--section-padding) var(--container-padding);
  background: var(--bg-primary);
  max-width: 900px;
  margin: 0 auto;
}

.spiral-track {
  margin-bottom: 4rem;
}

.spiral-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.spiral-marker {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
}

.spiral-a-color { color: var(--purple-light); }
.spiral-b-color { color: var(--cyan); }

.spiral-desc {
  font-size: 0.85rem;
  color: var(--white-30);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--white-10);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-dot {
  position: absolute;
  left: -2.5rem;
  top: 0.4rem;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  border: 2px solid;
  background: var(--space-deep);
  z-index: 1;
}

.spiral-a-dot { border-color: var(--purple); }
.spiral-b-dot { border-color: var(--cyan); }

.timeline-date {
  font-size: 0.78rem;
  color: var(--white-30);
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}

.timeline-body h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.15rem;
  color: var(--white-90);
  margin-bottom: 0.5rem;
}

.timeline-body p {
  font-size: 0.9rem;
  color: var(--white-50);
  line-height: 1.8;
}

.timeline-detail {
  margin-top: 0.5rem;
  font-style: italic;
  color: var(--white-30) !important;
  font-size: 0.85rem !important;
}

/* Intersections */
.intersections {
  padding: 4rem 0;
  text-align: center;
}

.intersections-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--gold);
  margin-bottom: 2.5rem;
}

.intersection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}

.intersection-card {
  padding: 1.75rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--t-base);
}

.intersection-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.cross-number {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 200;
  color: var(--gold);
  display: block;
  margin-bottom: 0.5rem;
}

.intersection-card h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1rem;
  color: var(--white);
  margin-bottom: 0.3rem;
}

.cross-date {
  font-size: 0.75rem;
  color: var(--white-30);
  display: block;
  margin-bottom: 0.75rem;
}

.intersection-card p {
  font-size: 0.82rem;
  color: var(--white-40);
  line-height: 1.7;
}

/* Philosophy */
.philosophy-section {
  padding: var(--section-padding) var(--container-padding);
  background: linear-gradient(180deg, var(--space-deep), var(--space-dark), var(--space-deep));
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.philosophy-card {
  padding: 2.5rem 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--t-base);
}

.philosophy-card:hover {
  border-color: var(--border-purple);
  box-shadow: var(--shadow-glow-purple);
}

.philosophy-icon {
  font-size: 2rem;
  color: var(--gold);
  display: block;
  margin-bottom: 1rem;
}

.philosophy-card h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 1rem;
}

.philosophy-card p {
  font-size: 0.88rem;
  color: var(--white-50);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.philosophy-card blockquote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--gold);
  padding-top: 1rem;
  border-top: 1px solid var(--white-08);
}

/* CTA */
.gs-cta {
  padding: var(--section-padding) var(--container-padding);
  text-align: center;
  background: var(--bg-primary);
}

.gs-cta h2 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 300;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.gs-cta p {
  color: var(--white-40);
  margin-bottom: 2rem;
}

.gs-cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
  .philosophy-grid { grid-template-columns: 1fr; max-width: 450px; margin: 0 auto; }
  .intersection-grid { grid-template-columns: 1fr 1fr; }
  .gs-cta-buttons { flex-direction: column; align-items: center; }
  .spiral-label { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
}

@media (max-width: 480px) {
  .intersection-grid { grid-template-columns: 1fr; }
}