/* ============================================================
   Casa Aura — Projects / 專案
   #D9D8D0 全寬區塊；單列水平跑馬燈，六張直式專案卡片。
   卡片：直式滿出血圖 + 白色文字（名稱左上、摘錄左下）。
   懸停暫停跑馬燈、淡入 50% 黑疊加層與摘錄。
   ============================================================ */

.projects {
  background: var(--color-alt-bg);
  padding-block: var(--section-padding-block);   /* 與其他常規區塊一致 */
  overflow: hidden;

  /* ---- 可調變數 ---- */
  --marquee-duration: 70s;                 /* 跑馬燈速度 */
  --proj-fade: 500ms;                      /* 疊加層 / 摘錄淡入 */
  --proj-gap: clamp(1.25rem, 2.5vw, 2.5rem);
  --proj-card-w: clamp(240px, 24vw, 340px);
}

/* 視窗：預設可水平捲動（無 JS / 減少動態時的後備） */
.projects__viewport {
  overflow-x: auto;
  scrollbar-width: none;                   /* Firefox 隱藏捲軸 */
}
.projects__viewport::-webkit-scrollbar {
  display: none;
}

/* 動畫啟用時：隱藏溢出，改由跑馬燈推動 */
.projects.is-animated .projects__viewport {
  overflow: hidden;
}

/* 軌道：水平排列，寬度依內容（每張卡片右側均勻間距，利於無縫循環）*/
.projects__track {
  display: flex;
  width: max-content;
}

.projects.is-animated .projects__track {
  will-change: transform;                  /* 位置由 projects.js 逐格推動 */
}

/* ---- 標題列：「作品集」＋ ← → ------------------------- */
.projects__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0 var(--page-gutter);
  margin-bottom: var(--space-4);
}
.projects__title {
  font-family: var(--font-zh-serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: 0.1em;
  color: var(--color-ink);
}
.projects__controls {
  display: none;                           /* 沒有 JS 時不顯示按鈕 */
  gap: 0.75rem;
}
.projects.is-ready .projects__controls {
  display: flex;
}
.projects__btn {
  width: 3rem;
  height: 3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-ink);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1;
  transition: background-color 0.3s ease, color 0.3s ease;
}
.projects__btn:hover {
  background: var(--color-ink);
  color: var(--color-page-bg);
}
.projects__btn:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 3px;
}

/* ---- View All Projects ------------------------------- */
.projects__more {
  display: flex;
  justify-content: center;
  margin-top: var(--space-5);
  padding: 0 var(--page-gutter);
}
.projects__more a {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: var(--fs-sm);
  color: var(--color-ink);
  padding-bottom: 0.35rem;
  border-bottom: 1px solid currentColor;
  transition: opacity 0.3s ease;
}
.projects__more a:hover {
  opacity: 0.6;
}

/* ---- 卡片 -------------------------------------------- */
.proj-card {
  position: relative;
  display: block;
  flex: none;
  width: var(--proj-card-w);
  aspect-ratio: 3 / 4;                     /* 高直版 */
  margin-right: var(--proj-gap);           /* 卡片間距（均勻，利於無縫循環）*/
  overflow: hidden;
  background: #1a1714;
}

.proj-card__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* 名稱可讀性：頂部微妙漸層（名稱在左上） */
.proj-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 45%;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.45), rgba(0, 0, 0, 0));
  pointer-events: none;
}

/* 懸停淡入的 50% 黑疊加層 */
.proj-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity var(--proj-fade) ease;
  pointer-events: none;
}
.proj-card:hover .proj-card__overlay,
.proj-card:focus-visible .proj-card__overlay {
  opacity: 1;
}

/* 文字：名稱左上、摘錄左下 */
.proj-card__content {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(1.25rem, 1.6vw, 1.75rem);
  color: var(--color-on-dark);
  pointer-events: none;
}

.proj-card__name {
  font-family: var(--font-display);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: clamp(1.1rem, 1.5vw, 1.5rem);
  color: var(--color-on-dark);
}

.proj-card__excerpt {
  max-width: 22ch;
  font-family: var(--font-zh-serif);
  font-weight: 400;
  font-size: var(--fs-base);
  line-height: 1.8;
  color: var(--color-on-dark);
  opacity: 0;                              /* 懸停才淡入 */
  transform: translateY(8px);
  transition:
    opacity var(--proj-fade) ease,
    transform var(--proj-fade) ease;
}
.proj-card:hover .proj-card__excerpt,
.proj-card:focus-visible .proj-card__excerpt {
  opacity: 1;
  transform: translateY(0);
}

/* ---- 手機：大卡片、摘錄常駐（無懸停）、保留跑馬燈 ----- */
@media (max-width: 768px) {
  .projects {
    --proj-card-w: 78vw;                  /* 一張約滿版、下一張在邊緣探出 */
  }
  /* 無懸停 → 摘錄預設顯示 */
  .proj-card__excerpt {
    opacity: 1;
    transform: none;
  }
  /* 底部漸層讓摘錄在圖上清晰可讀 */
  .proj-card::after {
    content: "";
    position: absolute;
    inset: auto 0 0 0;
    height: 55%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0));
    pointer-events: none;
  }
}

/* ---- 卡片可點擊：游標提示 ------------------------------ */
.proj-card {
  cursor: zoom-in;
}
.proj-card:focus-visible {
  outline: 2px solid var(--color-on-dark);
  outline-offset: -6px;
}

/* ============================================================
   燈箱（點擊卡片放大）
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 40;                             /* 高於導覽列(10) 與行動選單(20) */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.5rem, 5vw, 4rem);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;

  --lb-fade: 0.4s;
}
.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 18, 15, 0.97);   /* 幾乎全不透明，導覽列不會透出來 */
  cursor: zoom-out;
}

/* 圖 + 說明 */
.lightbox__figure {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  max-width: min(100%, 1100px);
  transform: scale(0.97);
  transition: transform var(--lb-fade) cubic-bezier(0.33, 0, 0.2, 1);
  pointer-events: none;                    /* 點圖以外皆可關閉 */
}
.lightbox.is-open .lightbox__figure {
  transform: scale(1);
}

.lightbox__img {
  display: block;
  max-width: 100%;
  max-height: 72vh;
  width: auto;
  height: auto;
  object-fit: contain;
}

.lightbox__caption {
  text-align: center;
  color: var(--color-on-dark);
}
.lightbox__name {
  font-family: var(--font-display);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: clamp(1.1rem, 1.6vw, 1.5rem);
  color: var(--color-on-dark);
}
.lightbox__more {
  display: inline-block;
  margin-top: var(--space-3);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: 0.8rem;
  color: var(--color-on-dark);
  padding-bottom: 0.3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.6);
  opacity: 0.8;
  transition: opacity 0.3s ease;
}
.lightbox__more:hover,
.lightbox__more:focus-visible {
  opacity: 1;
}
.lightbox__caption {
  pointer-events: auto;
}
.lightbox__excerpt {
  margin: var(--space-2) auto 0;
  max-width: 46ch;
  font-family: var(--font-zh-serif);
  font-size: var(--fs-base);
  line-height: 1.9;
  color: var(--color-on-dark);
  opacity: 0.85;
}

/* 關閉鈕與左右切換 */
.lightbox__close,
.lightbox__nav {
  position: absolute;
  z-index: 2;
  color: var(--color-on-dark);
  line-height: 1;
  opacity: 0.7;
  transition: opacity 0.3s ease;
}
.lightbox__close:hover,
.lightbox__nav:hover,
.lightbox__close:focus-visible,
.lightbox__nav:focus-visible {
  opacity: 1;
}

.lightbox__close {
  top: clamp(1rem, 2.5vw, 2rem);
  right: clamp(1rem, 2.5vw, 2rem);
  font-size: 2.25rem;
  padding: var(--space-2);
}

.lightbox__nav {
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
  padding: var(--space-3);
}
.lightbox__nav--prev {
  left: clamp(0.25rem, 1.5vw, 1.5rem);
}
.lightbox__nav--next {
  right: clamp(0.25rem, 1.5vw, 1.5rem);
}

/* 燈箱開啟時鎖定背景捲動 */
html.lightbox-open {
  overflow: hidden;
}

/* 手機：圖片給多一點高度、左右鈕縮小 */
@media (max-width: 768px) {
  .lightbox__img {
    max-height: 62vh;
  }
  .lightbox__nav {
    font-size: 2.25rem;
  }
  .lightbox__excerpt {
    font-size: var(--fs-sm);
  }
}

/* ---- 尊重「減少動態」偏好：停用跑馬燈，改手動捲動 ---- */
@media (prefers-reduced-motion: reduce) {
  .projects.is-animated .projects__viewport {
    overflow-x: auto;
  }
  .proj-card__excerpt {
    transition: none;
  }
  .lightbox,
  .lightbox__figure {
    transition: none;
  }
}