/* ============================================
   布局系统 — 网格 / 区段 / 响应式
   一会去哪儿 · Layout
   ============================================ */

/* ── 顶部导航 ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(250, 246, 240, 0.85);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid rgba(42, 37, 32, 0.06);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-lg);
}

.site-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  letter-spacing: var(--tracking-tight);
}

.site-header__logo-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.site-header__logo em {
  font-style: italic;
  color: var(--color-primary);
  font-weight: var(--weight-semibold);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* ── 城市选择器 ── */
.city-picker {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-xs) var(--space-md);
  background: var(--color-surface);
  border: 1px solid rgba(42, 37, 32, 0.08);
  border-radius: var(--radius-pill);
  font-size: var(--text-small);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.city-picker:hover {
  border-color: var(--color-primary-soft);
  background: var(--color-surface-elevated);
}

.city-picker__icon {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
}

.city-picker__chevron {
  width: 12px;
  height: 12px;
  color: var(--color-text-faint);
}

/* ── Hero 区段 ── */
.hero {
  position: relative;
  padding: var(--space-3xl) 0 var(--space-4xl);
  min-height: calc(100vh - var(--header-height));
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

/* 桌面端双栏布局 */
@media (min-width: 1024px) {
  .hero .container {
    flex-direction: row;
    align-items: stretch;
    gap: var(--space-3xl);
  }

  .hero__main {
    flex: 1 1 0;
    min-width: 0;
    max-width: 620px;
  }

  .hero__aside {
    flex: 0 0 400px;
    position: sticky;
    top: calc(var(--header-height) + var(--space-xl));
    align-self: flex-start;
    max-height: calc(100vh - var(--header-height) - var(--space-3xl));
    overflow-y: auto;
    scrollbar-width: thin;
  }
}

/* 移动端：aside 在 main 下方 */
@media (max-width: 1023px) {
  .hero__aside {
    order: 3;
  }
}

.hero__weather {
  align-self: flex-start;
  margin-bottom: var(--space-2xl);
  max-width: 380px;
}

.hero__content {
  max-width: 720px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-tiny);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.hero__eyebrow::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--color-primary);
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-lg);
}

.hero__title em {
  font-style: italic;
  color: var(--color-primary);
  position: relative;
}

.hero__title em::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0.08em;
  width: 100%;
  height: 0.12em;
  background: var(--color-accent-soft);
  z-index: -1;
  border-radius: var(--radius-pill);
}

.hero__subtitle {
  font-size: var(--text-h3);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-2xl);
  max-width: 540px;
}

.hero__cta-row {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.hero__social-proof {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-small);
  color: var(--color-text-faint);
}

.hero__social-proof .dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-circle);
  background: var(--color-good);
  animation: breathe 2s var(--ease-in-out) infinite;
}

/* ── 偏好定制区段 ── */
.preferences {
  padding: var(--space-3xl) 0;
}

.preferences__inner {
  max-width: var(--container-narrow);
  margin-inline: auto;
}

.preferences__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.preferences__title {
  font-size: var(--text-h1);
  margin-bottom: var(--space-sm);
}

.preferences__subtitle {
  font-size: var(--text-body);
  color: var(--color-text-muted);
}

/* ── 分步问卷 ── */
.preference-step {
  margin-bottom: var(--space-2xl);
  padding: var(--space-xl);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(42, 37, 32, 0.05);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.preference-step:hover {
  box-shadow: var(--shadow-md);
}

.preference-step__label {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.preference-step__number {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-style: italic;
  color: var(--color-primary);
  font-weight: var(--weight-semibold);
}

.preference-step__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: var(--weight-medium);
  color: var(--color-text);
}

.preference-step__hint {
  font-size: var(--text-tiny);
  color: var(--color-text-faint);
  margin-left: auto;
}

/* ── 选项网格 ── */
.option-grid {
  display: grid;
  gap: var(--space-sm);
}

.option-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.option-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.option-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.option-grid--5 {
  grid-template-columns: repeat(5, 1fr);
}

@media (max-width: 640px) {
  .option-grid--3,
  .option-grid--4,
  .option-grid--5 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── 提交栏 ── */
.preferences__submit {
  display: flex;
  justify-content: center;
  margin-top: var(--space-3xl);
}

/* ── AI 生成区段 ── */
.generating {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) 0;
  text-align: center;
}

.generating__canvas-wrap {
  position: relative;
  width: 200px;
  height: 200px;
  margin-bottom: var(--space-2xl);
}

.generating__canvas-wrap canvas {
  width: 100%;
  height: 100%;
}

.generating__fallback {
  display: none;
  width: 120px;
  height: 120px;
}

.generating__title {
  font-size: var(--text-h2);
  margin-bottom: var(--space-sm);
}

.generating__subtitle {
  font-size: var(--text-body);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
}

.generating__steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-align: left;
  min-width: 280px;
}

/* ── 结果区段 ── */
.results {
  padding: var(--space-3xl) 0;
}

.results__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.results__title {
  font-size: var(--text-h1);
  margin-bottom: var(--space-2xs);
}

.results__title em {
  font-style: italic;
  color: var(--color-primary);
}

.results__meta {
  font-size: var(--text-small);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.results__meta .divider {
  width: 4px;
  height: 4px;
  border-radius: var(--radius-circle);
  background: var(--color-text-faint);
}

/* ── 不对称结果网格 ── */
.results__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  align-items: start;
}

@media (min-width: 1024px) {
  .results__grid {
    grid-template-columns: 1.3fr 1fr;
    grid-template-areas:
      "card-0 card-1"
      "card-0 card-2"
      "card-3 card-3";
  }
  .results__grid .result-card:nth-child(1) { grid-area: card-0; }
  .results__grid .result-card:nth-child(2) { grid-area: card-1; }
  .results__grid .result-card:nth-child(3) { grid-area: card-2; }
  .results__grid .result-card:nth-child(4) { grid-area: card-3; }
}

@media (max-width: 1023px) {
  .results__grid {
    grid-template-columns: 1fr;
  }
}

/* ── 详情抽屉 ── */
.detail-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: rgba(42, 37, 32, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) var(--ease-smooth),
              visibility var(--duration-normal) var(--ease-smooth);
}

.detail-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.detail-drawer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-drawer);
  max-height: 92vh;
  background: var(--color-bg);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  box-shadow: var(--shadow-xl);
  transform: translateY(100%);
  transition: transform var(--duration-slower) var(--ease-out);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.detail-drawer.is-open {
  transform: translateY(0);
}

@media (min-width: 1024px) {
  .detail-drawer {
    top: 0;
    right: 0;
    left: auto;
    width: 560px;
    max-height: 100vh;
    border-radius: var(--radius-xl) 0 0 var(--radius-xl);
    transform: translateX(100%);
  }
  .detail-drawer.is-open {
    transform: translateX(0);
  }
}

.detail-drawer__handle {
  display: flex;
  justify-content: center;
  padding: var(--space-sm) 0 var(--space-xs);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: var(--z-raised);
}

.detail-drawer__handle::before {
  content: '';
  width: 40px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-text-faint);
  opacity: 0.4;
}

@media (min-width: 1024px) {
  .detail-drawer__handle {
    display: none;
  }
}

/* ── 页脚 ── */
.site-footer {
  padding: var(--space-2xl) 0;
  text-align: center;
  font-size: var(--text-tiny);
  color: var(--color-text-faint);
  border-top: 1px solid rgba(42, 37, 32, 0.06);
  margin-top: var(--space-4xl);
}

/* ── 响应式微调 ── */
@media (max-width: 640px) {
  .hero {
    padding: var(--space-2xl) 0 var(--space-3xl);
    min-height: auto;
  }

  .hero__weather {
    max-width: 100%;
  }

  .preference-step {
    padding: var(--space-lg);
  }

  .results__header {
    flex-direction: column;
    align-items: flex-start;
  }
}