/* =========================================================================
   Ann Coach — 首頁 Hero（Nav + Hero），對齊 Figma node 3:5 / 10:28
   轉場後由 scroll.js 淡入。
   ========================================================================= */

/* ---------- 首頁 Hero 容器（疊在形象照層底下，轉場時淡入） ---------- */
.home-hero {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  background: var(--color-white);   /* 首頁 Hero 白底（Figma） */
  opacity: 0;                 /* 由 scroll.js 於轉場時淡入 */
  will-change: opacity, transform;
}

/* ---------- Nav（3:5）：固定頂端、轉場後由 scroll.js 淡入 ---------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: clamp(14px, 1.6vw, 22px) clamp(24px, 5vw, 80px);
  background: var(--color-white);
  opacity: 0;                 /* 開場/轉場前隱藏；由 scroll.js 淡入 */
  visibility: hidden;
  transition: box-shadow 0.3s ease;
}
/* 捲離首頁 Hero 後加陰影，讓固定列與內容分層 */
.site-nav.is-scrolled { box-shadow: 0 2px 20px rgba(0, 0, 0, 0.07); }

.nav-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--color-on-light);
  font-size: clamp(17px, 1.5vw, 22px);
  white-space: nowrap;
}
.nav-logo .cjk-el {
  font-family: var(--font-cjk);
  font-weight: var(--fw-cjk-extralight);
}
.nav-logo .latin-el {
  font-family: var(--font-latin);
  font-weight: var(--fw-latin-extralight);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: clamp(16px, 1.8vw, 28px);
}
.nav-menu > a {
  font-family: var(--font-cjk);
  font-weight: var(--fw-cjk-extralight);
  font-size: clamp(15px, 1.15vw, 18px);
  color: var(--color-on-light);
  white-space: nowrap;
  transition: color 0.2s ease;
}
.nav-menu > a:hover { color: var(--color-accent); }

.nav-cta {
  font-family: var(--font-cjk);
  font-weight: var(--fw-cjk-medium) !important;
  color: var(--color-accent-ink) !important;
  background: var(--color-accent);
  padding: 0.4em 1em;
  border-radius: 56px;
  transition: filter 0.2s ease, transform 0.2s ease;
}
.nav-cta:hover { filter: brightness(1.06); transform: scale(1.02); }

/* Instagram icon（Nav / Footer 共用） */
.ig-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-on-light);
  transition: color 0.2s ease, transform 0.2s ease;
}
.ig-link svg { display: block; width: 24px; height: 24px; }
.ig-link:hover { color: var(--color-accent); transform: scale(1.08); }

/* ---------- Hero 主體（10:28） ---------- */
.hh-inner {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(32px, 5vw, 64px);
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 80px) clamp(24px, 4vw, 60px);
}

.hh-copy {
  flex: 1 1 0;
  max-width: 522px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(16px, 1.7vw, 25px);
}

.hh-eyebrow {
  font-family: var(--font-latin);
  font-weight: var(--fw-latin-medium);
  font-size: clamp(16px, 1.4vw, 22px);
  color: var(--color-on-light);
}

.hh-title {
  font-family: var(--font-cjk);
  font-weight: var(--fw-cjk-medium);
  font-size: clamp(30px, 3.9vw, 48px);
  line-height: 1.2;
  color: var(--color-on-light);
}
.hh-title .accent { color: var(--color-accent); }

.hh-sub {
  font-family: var(--font-cjk);
  font-weight: var(--fw-cjk-medium);
  font-size: clamp(16px, 1.4vw, 22px);
  color: var(--color-on-light);
}

.hh-cta {
  display: flex;
  gap: 16px;
  margin-top: clamp(4px, 0.8vw, 10px);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-cjk);
  font-weight: var(--fw-cjk-medium);
  font-size: clamp(15px, 1.3vw, 20px);
  padding: 0.55em 1.4em;
  border-radius: 50px;
  white-space: nowrap;
  cursor: pointer;
  transition: filter 0.2s ease, transform 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--primary:hover { filter: brightness(1.06); }
.btn--ghost { background: var(--color-accent-ink); color: var(--color-accent); }
.btn--ghost:hover { filter: brightness(0.98); }

.hh-photo {
  flex: 1 1 0;
  max-width: 522px;
  aspect-ratio: 522 / 640;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 30px 70px -35px rgba(0, 0, 0, 0.45);
}
.hh-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 漢堡按鈕（預設隱藏，< 900px 顯示） ---------- */
.nav-toggle {
  display: none;
  position: relative;
  z-index: 2;                 /* 高於滿版選單，保持可點 */
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-on-light);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.2s ease;
}
/* 開啟時變 X */
.nav-toggle.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- 響應式 ---------- */

/* 平板 + 手機（< 900px）：導覽列走漢堡，選單展開滿版 */
@media (max-width: 899px) {
  .nav-logo { position: relative; z-index: 2; }
  .nav-toggle { display: flex; }

  .nav-menu {
    position: fixed;
    inset: 0;
    z-index: 1;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: clamp(24px, 4vh, 40px);
    background: var(--color-cream);
    padding: 80px 24px 40px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }
  .nav-menu.is-open { opacity: 1; visibility: visible; pointer-events: auto; }

  .nav-menu > a { font-size: clamp(22px, 3vw, 28px); }
  .ig-link svg { width: 30px; height: 30px; }
  .nav-cta { font-size: clamp(20px, 2.6vw, 26px); padding: 0.5em 1.4em; }
}

/* 選單開啟時鎖住背景捲動 */
body.nav-open { overflow: hidden; }

/* 窄螢幕 Hero 堆疊 */
@media (max-width: 820px) {
  .hh-inner {
    flex-direction: column-reverse;
    text-align: center;
    gap: 28px;
    padding-top: 8px;
  }
  .hh-copy { align-items: center; max-width: 520px; }
  .hh-photo { width: min(78vw, 360px); }
}