/* ==========================================================================
   版面骨架 — Header / Drawer / Footer / Sticky Contact Bar
   對應：02-information-architecture.md §3、03-page-specs.md 第三部分
   ========================================================================== */

/* ── 原型提示條 ───────────────────────────── */

.proto-note {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--color-primary-deep);
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-caption);
}

.proto-note__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--gutter);
  max-width: var(--width-max);
  margin-inline: auto;
}

.proto-note__tag {
  flex-shrink: 0;
  padding: 2px 8px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xs);
  color: var(--color-accent);
  font-weight: 600;
}

.proto-note__text {
  flex: 1;
  min-width: 0;
  line-height: 1.6;
  opacity: 0.85;
}

/* 行動版只保留提示條首句，避免佔用過多首屏高度 */
@media (max-width: 767px) {
  .proto-note__detail { display: none; }
}

.proto-note__close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  color: inherit;
  opacity: 0.6;
  border-radius: var(--radius-xs);
}

.proto-note__close:hover { opacity: 1; }

/* ── Header ───────────────────────────────── */

.site-header {
  position: sticky;
  /* --proto-h 由 main.js 依原型提示條實際高度量測；正式站為 0 */
  top: var(--proto-h, 0px);
  z-index: 100;
  transition:
    background-color var(--duration-normal) var(--ease-out-expo),
    box-shadow var(--duration-normal) var(--ease-out-expo),
    color var(--duration-normal) var(--ease-out-expo);
}

/* 初始透明疊加於 Hero（白字），捲動 80px 後轉毛玻璃底 + 深色文字 */
.site-header--overlay {
  position: fixed;
  inset-inline: 0;
  top: var(--proto-h, 0px);
  color: var(--color-text-inverse);
  background: linear-gradient(
    to bottom,
    rgba(19, 42, 36, 0.62) 0%,
    rgba(19, 42, 36, 0.28) 60%,
    transparent 100%
  );
}

.site-header.is-stuck {
  position: fixed;
  color: var(--color-text);
  background: rgba(248, 245, 240, 0.86);
  backdrop-filter: saturate(180%) blur(14px);
  box-shadow: 0 1px 0 var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-height);
  max-width: var(--width-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-shrink: 0;
}

.brand__mark {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.brand__sub {
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  opacity: 0.62;
  font-family: var(--font-numeric);
  text-transform: uppercase;
}

/* 行動版收起拉丁副標，避免擠壓右側動作區 */
@media (max-width: 767px) {
  .brand__sub { display: none; }
}

.nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-inline: auto;
}

.nav__item { position: relative; }

.nav__link {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding-inline: var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: border-color var(--duration-fast) var(--ease-out-expo);
}

.nav__link:hover,
.nav__item:focus-within > .nav__link {
  border-bottom-color: var(--color-accent);
}

.nav__link[aria-current='page'] {
  border-bottom-color: currentColor;
}

/* 下拉選單：hover 觸發 + 鍵盤 focus 可達 */
.nav__panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  padding: var(--space-3);
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity var(--duration-fast) var(--ease-out-expo),
    transform var(--duration-fast) var(--ease-out-expo),
    visibility var(--duration-fast);
}

.nav__item:hover > .nav__panel,
.nav__item:focus-within > .nav__panel {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.nav__panel a {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-xs);
  font-size: var(--text-sm);
  transition: background-color var(--duration-fast) var(--ease-out-expo);
}

.nav__panel a:hover { background: var(--color-primary-soft); }

.nav__panel .is-cta {
  margin-top: var(--space-2);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
  color: var(--color-accent-strong);
  font-weight: 600;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-xs);
  color: inherit;
  transition: background-color var(--duration-fast) var(--ease-out-expo);
}

.icon-btn:hover { background: rgba(128, 128, 128, 0.14); }
.icon-btn svg { width: 21px; height: 21px; }

.header__tel {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding-inline: var(--space-3);
  height: 44px;
  font-weight: 600;
  font-size: var(--text-sm);
}

.header__tel svg { width: 18px; height: 18px; }

.header__cta { display: none; }

@media (min-width: 1024px) {
  .nav { display: flex; }
  .header__cta { display: inline-flex; }
  .nav-toggle { display: none; }
}

@media (min-width: 1280px) {
  .header__tel { display: inline-flex; }
}

/* ── 行動版抽屜 ───────────────────────────── */

.drawer {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--color-surface);
  color: var(--color-text);
  transform: translateX(100%);
  visibility: hidden;
  transition:
    transform var(--duration-normal) var(--ease-out-expo),
    visibility var(--duration-normal);
}

.drawer.is-open {
  transform: none;
  visibility: visible;
}

.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding-inline: var(--gutter);
  border-bottom: 1px solid var(--color-border);
}

.drawer__body {
  overflow-y: auto;
  padding: var(--space-4) var(--gutter) var(--space-6);
}

.drawer__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  min-height: 56px;
  font-size: var(--text-lg);
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}

.drawer__foot {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  padding: var(--space-4) var(--gutter)
    calc(var(--space-4) + env(safe-area-inset-bottom));
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-raised);
}

/* ── Sticky Contact Bar（RFP 明確要求，不可關閉即消失）── */

.sticky-contact {
  position: fixed;
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out-expo),
    visibility var(--duration-normal),
    transform var(--duration-normal) var(--ease-out-expo);
}

.sticky-contact.is-visible {
  opacity: 1;
  visibility: visible;
}

/* 行動版：底部固定橫列 */
.sticky-contact {
  inset-inline: 0;
  bottom: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  padding: var(--space-3) var(--gutter)
    calc(var(--space-3) + env(safe-area-inset-bottom));
  background: rgba(248, 245, 240, 0.94);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
  transform: translateY(8px);
}

.sticky-contact.is-visible { transform: none; }

.sticky-contact .btn { min-height: 56px; }

/* 直立展開條目僅用於桌機 */
.sticky-contact__item { display: none; }

/* 桌機：右緣垂直長條，hover 向左展開文字標籤 */
@media (min-width: 1024px) {
  .sticky-contact {
    inset-inline: auto 0;
    bottom: auto;
    top: 50%;
    display: flex;
    flex-direction: column;
    gap: 1px;
    width: auto;
    padding: 0;
    background: none;
    backdrop-filter: none;
    border: 0;
    transform: translateY(-50%) translateX(8px);
    overflow: hidden;
  }

  .sticky-contact.is-visible { transform: translateY(-50%); }

  .sticky-contact .btn { display: none; }

  .sticky-contact__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    height: 56px;
    padding-inline: 17px;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
    max-width: 56px;
    overflow: hidden;
    white-space: nowrap;
    transition:
      max-width var(--duration-normal) var(--ease-out-expo),
      background-color var(--duration-fast) var(--ease-out-expo);
  }

  .sticky-contact__item:first-child { border-radius: var(--radius-sm) 0 0 0; }
  .sticky-contact__item:last-child { border-radius: 0 0 0 var(--radius-sm); }

  .sticky-contact__item:hover,
  .sticky-contact__item:focus-visible {
    max-width: 240px;
    background: var(--color-primary-deep);
  }

  .sticky-contact__item svg {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
  }

  .sticky-contact__label {
    font-size: var(--text-sm);
    font-weight: 500;
    /* 收合狀態下 padding 區域仍會露出文字邊緣，以透明度確保乾淨 */
    opacity: 0;
    transition: opacity var(--duration-fast) var(--ease-out-expo);
  }

  .sticky-contact__item:hover .sticky-contact__label,
  .sticky-contact__item:focus-visible .sticky-contact__label { opacity: 1; }
}

/* ── 即時客服（右下，避開 Sticky Bar）──────── */

.livechat {
  position: fixed;
  right: var(--gutter);
  bottom: calc(88px + env(safe-area-inset-bottom));
  z-index: 85;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: #06c755;
  color: #fff;
  box-shadow: var(--shadow-lg);
  transition: transform var(--duration-fast) var(--ease-out-expo);
}

.livechat:hover { transform: scale(1.05); }
.livechat svg { width: 28px; height: 28px; }

@media (min-width: 1024px) {
  .livechat { bottom: var(--space-6); }
}

/* ── Footer ───────────────────────────────── */

.site-footer {
  background: var(--color-surface-raised);
  border-top: 1px solid var(--color-border);
  /* 避免 Sticky Bar 遮蔽頁尾內容 */
  padding-bottom: calc(96px + env(safe-area-inset-bottom));
}

@media (min-width: 1024px) {
  .site-footer { padding-bottom: 0; }
}

.footer__grid {
  display: grid;
  gap: var(--space-7);
  padding-block: var(--section-tight);
}

@media (min-width: 768px) {
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr 1.3fr; }
}

.footer__title {
  margin-bottom: var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__list a {
  display: inline-block;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast) var(--ease-out-expo);
}

.footer__list a:hover { border-bottom-color: var(--color-accent-strong); }

.footer__desc {
  margin-top: var(--space-4);
  max-width: 24em;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__edm {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.footer__edm .input { min-height: 48px; }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-5);
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer__bottom a { border-bottom: 1px solid transparent; }
.footer__bottom a:hover { border-bottom-color: currentColor; }
.footer__bottom .spacer { margin-left: auto; }