/* ============================================================
   品牌主页专属样式 · home.css · 决策 5
   ============================================================ */

/* ---- Topbar (品牌主页版) ---- */
.topbar--brand {
  background: transparent;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  border-bottom: none;
  padding: 20px 40px;
}
.topbar--brand .topbar__brand {
  color: rgba(255, 255, 255, 0.95);
  font-size: var(--text-caption);
  letter-spacing: 6px;
}
.topbar--brand .topbar__brand a {
  color: inherit;
  text-decoration: none;
}
.topbar__nav {
  display: flex;
  gap: 32px;
  font-size: var(--text-caption);
  letter-spacing: 5px;
}
.topbar__nav a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color 0.3s;
}
.topbar__nav a:hover { color: #fff; }

/* ---- Brand Hero (星图满屏) ---- */
.brand-hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  background: radial-gradient(ellipse at center bottom, #1A2640 0%, #0A0F1F 60%, #050810 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-hero__sky {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}
.brand-hero__svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* 星点慢漂动画 */
.stars--layer1 {
  animation: drift1 120s linear infinite;
}
.stars--layer2 {
  animation: drift2 80s linear infinite;
}
@keyframes drift1 {
  0%   { transform: translate(0, 0); }
  50%  { transform: translate(-30px, 15px); }
  100% { transform: translate(0, 0); }
}
@keyframes drift2 {
  0%   { transform: translate(0, 0); }
  50%  { transform: translate(20px, -10px); }
  100% { transform: translate(0, 0); }
}

/* 星点呼吸闪烁 */
.stars circle {
  animation: twinkle 4s ease-in-out infinite;
}
.stars circle:nth-child(2n)  { animation-delay: 1s; animation-duration: 5s; }
.stars circle:nth-child(3n)  { animation-delay: 2s; animation-duration: 6s; }
.stars circle:nth-child(5n)  { animation-delay: 0.5s; animation-duration: 3s; }
@keyframes twinkle {
  0%, 100% { opacity: 0.6; }
  50%      { opacity: 1; }
}

.brand-hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  padding: 0 20px;
}

.brand-hero__eyebrow {
  font-size: var(--text-caption);
  letter-spacing: 10px;
  color: rgba(255, 216, 168, 0.8);
  margin: 0 0 50px;
  font-family: var(--font-serif-cn), serif;
}

.brand-hero__title {
  font-size: var(--text-poster);
  letter-spacing: 32px;
  text-indent: 32px;
  margin: 0 0 24px;
  font-weight: 300;
  color: #fff;
  font-family: var(--font-serif-cn), serif;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.6), 0 0 80px rgba(255, 216, 168, 0.15);
}

.brand-hero__en {
  font-size: var(--text-body);
  letter-spacing: 12px;
  color: rgba(255, 216, 168, 0.85);
  margin: 0 0 56px;
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
}

.brand-hero__tagline {
  font-size: var(--text-body);
  letter-spacing: 8px;
  color: rgba(255, 255, 255, 0.75);
  margin: 0 0 70px;
  font-family: var(--font-serif-cn), serif;
}

.brand-hero__cta {
  display: inline-block;
  padding: 16px 40px;
  border: 1.5px solid rgba(255, 216, 168, 0.7);
  color: #FFD8A8;
  text-decoration: none;
  font-size: var(--text-caption);
  letter-spacing: 8px;
  font-family: var(--font-serif-cn), serif;
  transition: all 0.4s;
}
.brand-hero__cta:hover {
  background: rgba(255, 216, 168, 0.12);
  border-color: #FFD8A8;
  color: #fff;
  box-shadow: 0 0 30px rgba(255, 216, 168, 0.25);
}


/* ---- Section 2: 三步 ---- */
.three-steps {
  background: #FBF7EF;
  padding: 100px 40px;
}
.three-steps__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
}
.three-steps__item {
  flex: 1;
  text-align: center;
  padding: 30px 20px;
}
.three-steps__num {
  font-size: var(--text-display);
  color: var(--color-seal);
  font-family: var(--font-serif-cn), serif;
  font-weight: 200;
  margin-bottom: 14px;
}
.three-steps__title {
  font-size: var(--text-body-lg);
  letter-spacing: 8px;
  color: var(--color-ink);
  margin-bottom: 12px;
  font-family: var(--font-serif-cn), serif;
}
.three-steps__desc {
  font-size: var(--text-caption);
  letter-spacing: 3px;
  color: #6B6B6B;
  line-height: 1.8;
}
.three-steps__divider {
  font-size: var(--text-h3);
  color: #C9B998;
  font-family: var(--font-serif-cn), serif;
  font-weight: 200;
}


/* ---- Section 3: 主推 ---- */
.featured {
  background: #FBF7EF;
  padding: 60px 40px 80px;
}
.featured__grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.featured__card {
  background: #fff;
  border: 1px solid #D8CFC0;
  padding: 50px 44px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: all 0.3s;
  position: relative;
}
.featured__card:hover {
  border-color: var(--color-seal);
  box-shadow: 0 12px 40px rgba(160, 82, 45, 0.12);
  transform: translateY(-4px);
}
.featured__card--primary {
  background: linear-gradient(135deg, #fff 0%, #FFF8EE 100%);
}
.featured__card--collector {
  background: linear-gradient(135deg, #1A2640 0%, #0A0F1F 100%);
  color: #fff;
  border-color: #2A3650;
}
.featured__card--collector:hover {
  border-color: #FFD8A8;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}
.featured__card-label {
  font-size: var(--text-caption);
  letter-spacing: 6px;
  color: var(--color-fenghou);
  font-family: 'Cormorant Garamond', serif;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.featured__card--collector .featured__card-label {
  color: #FFD8A8;
}
.featured__card-title {
  font-size: var(--text-h3);
  letter-spacing: 12px;
  margin: 0 0 8px;
  font-weight: 500;
  font-family: var(--font-serif-cn), serif;
}
.featured__card-en {
  font-size: var(--text-caption);
  letter-spacing: 4px;
  color: #6B6B6B;
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  margin: 0 0 28px;
}
.featured__card--collector .featured__card-en {
  color: rgba(255, 216, 168, 0.7);
}
.featured__card-desc {
  font-size: var(--text-caption);
  line-height: 2;
  letter-spacing: 2px;
  color: var(--color-ink-light);
  margin: 0 0 32px;
  flex: 1;
}
.featured__card--collector .featured__card-desc {
  color: rgba(255, 255, 255, 0.8);
}
.featured__card-cta {
  font-size: var(--text-caption);
  letter-spacing: 6px;
  color: var(--color-seal);
  align-self: flex-start;
  border-bottom: 1px solid currentColor;
  padding-bottom: 4px;
}
.featured__card--collector .featured__card-cta {
  color: #FFD8A8;
}


/* ---- Section 4: 次级网格 ---- */
.secondary-grid-wrap {
  background: #F5EFE2;
  padding: 80px 40px 60px;
  text-align: center;
}
.section-title {
  font-size: var(--text-h4);
  letter-spacing: 14px;
  color: var(--color-ink);
  margin: 0 0 14px;
  font-weight: 400;
  font-family: var(--font-serif-cn), serif;
}
.section-subtitle {
  font-size: var(--text-caption);
  letter-spacing: 5px;
  color: #6B6B6B;
  margin: 0 0 48px;
  font-family: var(--font-serif-cn), serif;
}
.secondary-grid {
  max-width: 1100px;
  margin: 0 auto 40px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.secondary-grid__item {
  background: #fff;
  border: 1px solid #E5DCC8;
  padding: 20px 14px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  font-size: var(--text-caption);
  letter-spacing: 3px;
  line-height: 1.6;
  transition: all 0.25s;
  font-family: var(--font-serif-cn), serif;
}
.secondary-grid__item:hover {
  border-color: var(--color-seal);
  color: var(--color-seal);
  transform: translateY(-2px);
}
.secondary-grid__item-num {
  font-size: var(--text-body);
  color: var(--color-fenghou);
  display: block;
  margin-bottom: 6px;
  font-family: 'Cormorant Garamond', serif;
}
.secondary-grid__item-title {
  display: block;
  color: var(--color-ink);
}
.secondary-grid__more {
  margin-top: 32px;
}
.secondary-grid__more-link {
  display: inline-block;
  color: var(--color-fenghou);
  text-decoration: none;
  font-size: var(--text-caption);
  letter-spacing: 6px;
  border-bottom: 1px solid transparent;
  padding-bottom: 3px;
  transition: border-color 0.3s;
}
.secondary-grid__more-link:hover {
  border-bottom-color: var(--color-fenghou);
}


/* ---- Footer ---- */
.brand-footer {
  background: #1A1A1A;
  color: rgba(255, 255, 255, 0.7);
  padding: 50px 40px;
}
.brand-footer__inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}
.brand-footer__links {
  font-size: var(--text-caption);
  letter-spacing: 5px;
  margin-bottom: 20px;
}
.brand-footer__links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.3s;
}
.brand-footer__links a:hover {
  color: #FFD8A8;
}
.brand-footer__brand {
  font-size: var(--text-caption);
  letter-spacing: 4px;
  margin-bottom: 12px;
  color: rgba(255, 255, 255, 0.5);
  font-family: 'Cormorant Garamond', serif;
}
.brand-footer__tagline {
  font-size: var(--text-caption);
  letter-spacing: 4px;
  color: rgba(255, 255, 255, 0.45);
  font-family: var(--font-serif-cn), serif;
  font-style: italic;
}

.footer__link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.footer__link:hover {
  border-bottom-color: currentColor;
}


/* ---- 移动端响应 ---- */
@media (max-width: 768px) {
  .topbar--brand { padding: 14px 20px; flex-direction: column; gap: 8px; }
  .topbar__nav { gap: 16px; font-size: var(--text-caption); letter-spacing: 3px; }
  .brand-hero { min-height: 500px; }
  .brand-hero__title { font-size: var(--text-h1); letter-spacing: 14px; text-indent: 14px; }
  .brand-hero__en { font-size: var(--text-caption); letter-spacing: 6px; }
  .brand-hero__tagline { font-size: var(--text-caption); letter-spacing: 4px; padding: 0 20px; }
  .brand-hero__eyebrow { font-size: var(--text-caption); letter-spacing: 5px; }
  .brand-hero__cta { font-size: var(--text-caption); letter-spacing: 5px; padding: 12px 28px; }

  .three-steps__inner { flex-direction: column; gap: 16px; }
  .three-steps__divider { transform: rotate(90deg); }
  .three-steps__num { font-size: var(--text-h1); }
  .three-steps__title { font-size: var(--text-body); letter-spacing: 5px; }

  .featured__grid { grid-template-columns: 1fr; gap: 20px; }
  .featured__card { padding: 32px 24px; }
  .featured__card-title { font-size: var(--text-h4); letter-spacing: 7px; }

  .secondary-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .section-title { font-size: var(--text-body); letter-spacing: 8px; }
}