/* ── Reset ───────────────────────────────────── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  background: #fff;
  color: #111;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #ebebeb;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 40px;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.site-name {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
  cursor: pointer;
}

.nav-main {
  display: flex;
  gap: 28px;
  flex: 1;
}

.nav-link {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #bbb;
  text-transform: uppercase;
  transition: color 0.15s;
  cursor: pointer;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: #111;
}

.nav-social {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-shrink: 0;
}

.social-link {
  display: flex;
  align-items: center;
  color: #ccc;
  transition: color 0.15s;
}

.social-link:hover {
  color: #111;
}

.social-link svg {
  width: 16px;
  height: 16px;
}

/* ── Main ────────────────────────────────────── */

#main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 40px 80px;
}

/* ── Masonry ─────────────────────────────────── */

.masonry {
  columns: 3;
  column-gap: 20px;
}

.card {
  break-inside: avoid;
  page-break-inside: avoid;
  margin-bottom: 20px;
  cursor: pointer;
}

.card-image-wrap {
  overflow: hidden;
  background: #f5f5f5;
  line-height: 0;
}

.card-image {
  width: 100%;
  display: block;
  transition: opacity 0.25s ease;
}

.card:hover .card-image {
  opacity: 0.75;
}

.card-title {
  padding: 9px 0 0;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: #999;
  text-transform: uppercase;
}

/* ── About ───────────────────────────────────── */

.about-section {
  max-width: 520px;
  padding-top: 8px;
}

.about-section p {
  font-size: 15px;
  line-height: 1.95;
  color: #444;
  margin-bottom: 1.4em;
}

.about-section p:last-child {
  margin-bottom: 0;
}

/* ── Dialog ──────────────────────────────────── */

dialog {
  padding: 0;
  border: none;
  max-width: min(760px, 92vw);
  width: 100%;
  max-height: 82vh;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.18);
  /* 強制置中，避免 display:flex 覆蓋 UA 預設定位 */
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
}

dialog[open] {
  display: flex;
  flex-direction: column;
  animation: dialogIn 0.2s ease-out;
  will-change: transform, opacity;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  animation: backdropIn 0.2s ease-out;
}

@keyframes dialogIn {
  from {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@keyframes backdropIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.dialog-header {
  display: flex;
  justify-content: flex-end;
  padding: 14px 14px 0;
  flex-shrink: 0;
  background: #fff;
}

.dialog-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  cursor: pointer;
  color: #bbb;
  transition: color 0.15s;
}

.dialog-close:hover {
  color: #111;
}

.dialog-close svg {
  width: 20px;
  height: 20px;
}

.dialog-body {
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: 16px 44px 52px;
}

.dialog-item {
  margin-bottom: 32px;
}

.dialog-item:last-child {
  margin-bottom: 0;
}

.dialog-item img {
  width: 100%;
  display: block;
  background: #f5f5f5;
}

.dialog-item-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.75;
  color: #aaa;
  letter-spacing: 0.02em;
}

/* ── Utility ─────────────────────────────────── */

.hidden {
  display: none !important;
}

/* ── Responsive ──────────────────────────────── */

@media (max-width: 960px) {
  .header-inner {
    padding: 0 24px;
    gap: 24px;
  }

  #main {
    padding: 72px 24px 60px;
  }

  .masonry {
    columns: 2;
    column-gap: 16px;
  }

  .card {
    margin-bottom: 16px;
  }
}

@media (max-width: 600px) {
  .header-inner {
    padding: 0 16px;
    gap: 16px;
    height: 52px;
  }

  .site-name {
    font-size: 13px;
  }

  .nav-main {
    gap: 16px;
  }

  #main {
    padding: 64px 16px 48px;
  }

  .masonry {
    columns: 2;
    column-gap: 10px;
  }

  .card {
    margin-bottom: 10px;
  }

  .dialog-body {
    padding: 8px 20px 36px;
  }
}

@media (max-width: 380px) {
  .masonry {
    columns: 1;
  }
}