/* ============================================================
   Tabs — horizontal tab bar with hairline underline + orange
   active accent · paired with .tab-panel switching.

   Promoted from project pattern on 2026-05-26 (was shared.css).
   Used on Earnings page (Overview / Transactions / Payouts / Tax),
   E-Shop (Products / Bundles / Auctions), Projects (status filter
   tabs), Fans CRM (Leaderboard / Hall of fame).

   Anatomy:
     .tabs (role="tablist")
       .tabs__item              (button, default style)
         <text>
         .tabs__item-count      (optional pill badge with number)
       .tabs__item--active      (foreground color + orange underline)
     .tab-panel                 (hidden by default)
       .tab-panel--active       (display: block)

   The tab → panel mapping is wired by inline JS on the consuming
   page (see earnings.html for canonical example).
   ============================================================ */
.tabs {
  display: flex;
  gap: var(--sp-4);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--sp-20);
}
.tabs__item {
  padding: var(--sp-10) var(--sp-14);
  font-family: var(--font-ui);
  font-size: var(--fs-13);
  font-weight: var(--fw-regular);
  color: var(--muted-foreground);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tabs__item:hover { color: var(--foreground); }
.tabs__item--active {
  color: var(--foreground);
  border-bottom-color: var(--primary);
}
.tabs__item-count {
  margin-left: var(--sp-6);
  font-size: var(--fs-11);
  color: var(--muted-foreground);
  background: var(--muted);
  border-radius: var(--radius-pill);
  padding: 1px 7px;
}
/* Opt-in plain count: keep the label/count rhythm without a separate pill.
   計數色用最暗文字 token --muted-foreground（原 --foreground-muted 偏亮），讓計數更退後、
   不與標籤爭焦（2026-07-24 使用者反饋「顏色再深一點」）。 */
.tabs--count-plain .tabs__item-count {
  padding: 0;
  color: var(--muted-foreground);
  background: transparent;
}

/* ── .tabs--brand — opt-in pill variant with a soft brand (orange) active
     fill instead of the underline. Used as a primary type switch where a
     little brand colour is wanted without a saturated block (E-Shop F3
     Products / Bundles / Auctions). Does NOT change the default .tabs, so
     other pages keep the underline style. (2026-06-15) ── */
.tabs--brand {
  gap: var(--sp-8);
  border-bottom: 0;
  margin-bottom: 0;
}
.tabs--brand .tabs__item {
  padding: 9px var(--sp-16);
  border-bottom: 0;
  margin-bottom: 0;
  border-radius: var(--radius-pill);
  color: var(--foreground-muted);
  transition:
    background-color var(--duration) var(--easing),
    color var(--duration) var(--easing);
}
.tabs--brand .tabs__item:hover {
  background: var(--accent);   /* Q9 2026-07-13：未選項 hover 統一用 accent */
  color: var(--foreground);
}
.tabs--brand .tabs__item--active {
  background: color-mix(in srgb, var(--primary) 18%, var(--card));
  color: var(--foreground);
  border-bottom: 0;
}
.tabs--brand .tabs__item--active:hover {
  background: color-mix(in srgb, var(--primary) 24%, var(--card));
}

/* ── .tabs--underline-short — variant with the base gray divider off and the
     active underline shortened + centered (≈ text width, not full item pad)
     instead of full-width. Separator is left to the consuming context (e.g.
     a downward toolbar shadow) rather than the base `.tabs` gray border.
     Promoted from an E-Shop page override (Figma node 671-2337/671-2295,
     E-Shop F3 type switch). (2026-07-10) ── */
.tabs--underline-short {
  border-bottom-color: transparent;
}
.tabs--underline-short .tabs__item {
  position: relative;
  /* 讓分頁被拉高時（例如收進較高的工具列卡），文字垂直置中、底線仍靠分頁底緣（::after bottom:0）。
     2026-07-22：平台費率頁工具列卡需要「文字置中＋底線貼卡底邊」。 */
  display: inline-flex;
  align-items: center;
}
.tabs--underline-short .tabs__item--active {
  border-bottom-color: transparent;
}
.tabs--underline-short .tabs__item--active::after {
  content: "";
  position: absolute;
  left: var(--sp-12);
  right: var(--sp-12);
  bottom: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

/* ── .tabs--underline-label — opt-in：active 底線只和「第一個子元素（標籤 span）」等寬、
     不含尾隨的計數徽章（.tabs__item-count）。用於標籤後帶計數的分頁（如 projects 狀態列）。
     搭 .tabs--underline-short 使用；底線改掛在標籤 span 上（撐成整列高、文字置中，::after
     bottom:0 才落在分頁底緣）。**只適用「標籤包在子元素裡」的分頁**——標籤為 <button> 直接
     文字的分頁（product-detail／admin-platform-fees）不加此 class，維持整條 item 底線。
     2026-07-24 使用者反饋：projects 狀態列底線不要延伸到計數數字下方。 ── */
.tabs--underline-label.tabs--underline-short .tabs__item--active::after {
  content: none;
}
.tabs--underline-label .tabs__item > :first-child {
  position: relative;
  align-self: stretch;
  display: inline-flex;
  align-items: center;
}
.tabs--underline-label .tabs__item--active > :first-child::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  /* 標籤 span 因 align-self:stretch 撐滿 item 內容框、底緣在 item 底內距（--sp-10）之上；
     下移 --sp-12 讓底線貼齊 item／卡片底緣（比 --sp-10 多的 2px 補標籤框未完全填滿內容框的
     算繪誤差），而非浮在標籤正下方（2026-07-24 使用者反饋「底線要貼底邊」）。 */
  bottom: calc(-1 * var(--sp-12));
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

/* ── .tabs--card — opt-in variant that puts the tab bar on its own filled
     card instead of a bare hairline row: same surface treatment as
     `.form-section--outlined` (fill + resting shadow + top edge highlight,
     Q18), so the tab bar reads as the first card of the page rather than a
     divider line. The base gray border-bottom is dropped — separation comes
     from the card edge. Pair with `.tabs--underline-short` so the orange
     active marker sits under the label instead of spanning the whole item.
     Does NOT change the default .tabs; the other 15 consumer pages keep the
     hairline style. (2026-07-20, Figma node 849-19673)
     Consumers: product-detail.html ── */
.tabs--card {
  background: var(--card);
  border-bottom: 0;
  border-radius: var(--radius-xl);
  /* 下內距歸零（2026-07-21 使用者裁示）：橘色底線畫在 .tabs__item 的 bottom:0，
     卡片若留下內距，底線就會浮在卡面中間而非貼著卡片下緣。 */
  padding: var(--sp-6) var(--sp-12) 0;
  box-shadow: var(--shadow-card), var(--shadow-edge-top);
  margin-bottom: var(--sp-16);
}
/* base 的 -1px 是用來把 item 壓在 .tabs 的 hairline 上；card 變體沒有那條 hairline，
   留著只會讓底線多凸出卡片 1px。 */
.tabs--card .tabs__item { margin-bottom: 0; }

/* ── .live-dot — ambient activity dot for the one state that means "happening
     right now and earning" (Projects Live / 已上線). Opt-in per item.
     (2026-07-27, L directive "a breathing dot")

     Rides `.tabs__item--live` OR `.filter-tabs__item--live`, so it follows the
     MEANING rather than a position: after the 2026-07-27 restructure the Live
     control is a state pill on row 2, not a tab on row 1.

     Colour: --primary (orange), NOT green. The same projects wear
     .badge--orange in the Status column, and green is already spoken for by
     Published (.badge--success). One concept, one colour — a green dot here
     would be the Published colour pointing at Live rows.

     Motion: ambient, not a UI transition, so it sits outside the 150–300ms
     feedback budget — 2.6s at low amplitude reads as breathing rather than
     blinking. Only transform+opacity animate (GPU; no layout, no paint of the
     tab itself). The solid core never moves so the dot stays legible; only the
     halo breathes.

     Why looping is allowed here at all: the house rule is that persistent
     chrome does not animate (see the side-rail's zero-entrance-animation
     spec), and Vercel's Status Dot animates only in TRANSITIONAL states and
     goes static at terminal ones. Live is where money is actively moving — that
     is what earns the motion. Every settled state (Draft/Scheduled/Succeeded/
     Cancelled) stays still.

     Three guards keep it honest:
       1. data-live="0"  → the dot is removed entirely. It can never imply
          activity that does not exist.
       2. prefers-reduced-motion → static ring, no movement.
       3. html[data-hidden] (set on visibilitychange) → paused off-screen, so
          a backgrounded tab costs nothing.
     The dot is aria-hidden: the control already says "Live" + a count, so
     liveness is never carried by colour alone (WCAG 1.4.1). ── */
.tabs__item--live .live-dot,
.filter-tabs__item--live .live-dot {
  /* Renders before the label. DOM order stays [label][count][dot] so
     .tabs--underline-label's `> :first-child` is still the label span and the
     active underline keeps measuring the label only. */
  order: -1;
  position: relative;
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}
/* .tabs__item has no gap, so the dot buys its own spacing; .filter-tabs__item
   already sets gap:--sp-6 between children, so adding a margin there would
   double-space it. */
.tabs__item--live .live-dot { margin-right: var(--sp-8); }
.tabs__item--live .live-dot::after,
.filter-tabs__item--live .live-dot::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--primary);
  animation: tabs-live-breathe 2600ms cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes tabs-live-breathe {
  0%, 100% { transform: scale(1);   opacity: 0.5; }
  50%      { transform: scale(2.2); opacity: 0;   }
}
/* Nothing live ⇒ no indicator. */
.tabs__item--live[data-live="0"] .live-dot,
.filter-tabs__item--live[data-live="0"] .live-dot { display: none; }
/* Off-screen ⇒ stop burning frames (paired with the visibilitychange hook). */
html[data-hidden] .tabs__item--live .live-dot::after,
html[data-hidden] .filter-tabs__item--live .live-dot::after { animation-play-state: paused; }
@media (prefers-reduced-motion: reduce) {
  .tabs__item--live .live-dot::after,
  .filter-tabs__item--live .live-dot::after {
    animation: none;
    opacity: 0.32;
    transform: scale(1.8);
  }
}

/* When .tabs__item is rendered as <button> (programmatic tabs),
   strip default button chrome. */
button.tabs__item {
  background: transparent;
  border: 0;
  font-family: inherit;
  outline: none;
}
button.tabs__item:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Panel — switched in sync with .tabs__item--active by inline JS */
.tab-panel { display: none; }
.tab-panel--active { display: block; }