/* ============================================================
   nav.css — 導覽列（含手機漢堡選單）
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 0;
}

/* ── Logo ── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-right: 20px;
  border-right: 1px solid var(--border);
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--pink);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.nav-logo-mark svg { width: 18px; height: 18px; }
.nav-logo-text {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--text);
}
.nav-logo-text .accent { color: var(--pink); }

/* ── 主選單包裝（桌面：一排；手機：收合抽屜） ── */
.nav-menu {
  display: flex;
  align-items: center;
  flex: 1;
  gap: 0;
}

/* ── 分頁 Tab ── */
.nav-tabs {
  display: flex;
  flex: 1;
  padding-left: 8px;
}
.nav-tab {
  padding: 0 16px;
  height: var(--nav-h);
  font-size: 13px;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
}
.nav-tab:hover  { color: var(--text-dim); }
.nav-tab.active {
  color: var(--pink-bright);
  border-bottom-color: var(--pink);
}

/* ── 右側按鈕 ── */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 12px;
  flex-shrink: 0;
}

/* ── 漢堡按鈕（手機專用）── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border-md);
  border-radius: var(--r-md);
  padding: 8px;
  margin-left: auto;
}
.nav-hamburger span {
  display: block;
  height: 1.5px;
  background: var(--text-dim);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── 手機響應式 ── */
@media (max-width: 768px) {
  .nav {
    padding: 0 16px;
    flex-wrap: wrap;
    height: auto;
    min-height: var(--nav-h);
  }

  .nav-logo {
    height: var(--nav-h);
    border-right: none;
    padding-right: 0;
  }

  .nav-hamburger { display: flex; }

  .nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    border-top: 1px solid var(--border);
    padding: 12px 0;
    gap: 0;
  }
  .nav-menu.open { display: flex; }

  .nav-tabs {
    flex-direction: column;
    padding-left: 0;
  }
  .nav-tab {
    height: auto;
    padding: 13px 16px;
    text-align: left;
    border-bottom: none;
    border-left: 2px solid transparent;
    font-size: 14px;
  }
  .nav-tab.active {
    border-bottom-color: transparent;
    border-left-color: var(--pink);
    background: var(--pink-dim);
    color: var(--pink-bright);
  }

  .nav-actions {
    padding: 12px 16px 4px;
    border-top: 1px solid var(--border);
    justify-content: stretch;
  }
  .nav-actions .btn-ghost,
  .nav-actions .btn-pink {
    flex: 1;
    text-align: center;
    padding: 10px;
    font-size: 14px;
  }

  #app {
    /* 手機導覽列高度會因展開而變動，先固定 nav-h */
    padding-top: var(--nav-h);
  }
}