/* ============================================================
   暗房 / VISUAL DATABASE — Minimal · Editorial · Archive
   ============================================================ */

:root {
  --bg: #f7f5f0;          /* 米白 */
  --bg-card: #fcfbf8;
  --ink: #141414;
  --ink-2: #6f6c66;       /* 辅助信息 */
  --line: #141414;
  --line-soft: #d8d4cb;
  --accent-bg: #141414;
  --accent-ink: #f7f5f0;
  --font: "Helvetica Neue", Helvetica, Arial, "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "Courier New", monospace;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button, input { font-family: inherit; font-size: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }

/* ---------------- Header ---------------- */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  padding: 40px 40px 24px;
  border-bottom: 1px solid var(--line);
}

.brand h1 {
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.brand-en {
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--ink-2);
}

.brand-sub {
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-2);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 12px;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.entry-count { color: var(--ink-2); }

.group-toggle {
  border: 1px solid var(--line);
  padding: 6px 14px;
  letter-spacing: 0.14em;
  font-size: 12px;
  background: var(--bg-card);
}
.group-toggle:hover { background: var(--accent-bg); color: var(--accent-ink); }

/* ---------------- Toolbar ---------------- */

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding: 14px 40px;
  border-bottom: 1px solid var(--line);
}

.cat-tabs { display: flex; gap: 2px; flex-wrap: wrap; }

.cat-tabs button {
  padding: 6px 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  border: 1px solid transparent;
  color: var(--ink-2);
}
.cat-tabs button:hover { color: var(--ink); }
.cat-tabs button.active {
  color: var(--ink);
  border-color: var(--line);
  background: var(--bg-card);
}

.search-box input {
  width: 340px;
  max-width: 60vw;
  padding: 6px 2px;
  font-size: 13px;
  border: none;
  border-bottom: 1px solid var(--line);
  background: transparent;
  outline: none;
  letter-spacing: 0.04em;
}
.search-box input::placeholder { color: var(--ink-2); }

/* ---------------- Tag bar ---------------- */

.tagbar-wrap {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 10px 40px;
  border-bottom: 1px solid var(--line-soft);
}

.tagbar-label {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-2);
  padding-top: 4px;
  flex: none;
}

.tagbar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  max-height: 66px;
  overflow-y: auto;
}

.tag-chip {
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.04em;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
}
.tag-chip:hover { color: var(--ink); }
.tag-chip.active { color: var(--ink); border-bottom-color: var(--line); }
.tag-chip .n { font-size: 9px; color: var(--ink-2); margin-left: 2px; }

/* ---------------- Status line ---------------- */

.status-line {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 40px;
  font-size: 12px;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--line);
  background: var(--bg-card);
}
.status-line .quit {
  text-decoration: underline;
  text-underline-offset: 3px;
  font-size: 11px;
}

/* ---------------- Grid & cards ---------------- */

.grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.card {
  background: var(--bg);
  perspective: 1400px;
  min-width: 0;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0.1, 0.2, 1);
  cursor: pointer;
}

.card.flipped .card-inner { transform: rotateY(180deg); }

.card-face {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--bg);
  display: flex;
  flex-direction: column;
}

/* front */
.card-front { position: relative; }

.thumb {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--bg-card);
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(12%);
  transition: filter 0.3s ease;
}
.card:hover .thumb img { filter: grayscale(0%); }

.thumb-missing {
  text-align: center;
  color: var(--ink-2);
  font-size: 10px;
  letter-spacing: 0.2em;
  line-height: 2;
}

.front-meta {
  padding: 10px 12px 14px;
  min-height: 96px;
}

.fid {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-2);
}

.fcat {
  float: right;
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--ink-2);
}

.ftitle {
  clear: both;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.45;
}

.more-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg);
  border: 1px solid var(--line);
  font-size: 10px;
  font-family: var(--mono);
  padding: 1px 6px;
}

/* back */
.card-back {
  position: absolute;
  inset: 0;
  transform: rotateY(180deg);
  padding: 14px 14px 12px;
  border: 1px solid var(--line);
  overflow-y: auto;
  font-size: 12px;
}

.card-back header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
  margin-bottom: 8px;
}

.card-back h3 { font-size: 13px; font-weight: 600; margin-top: 3px; line-height: 1.4; }

.card-back dl > div { margin-bottom: 7px; }

.card-back dt {
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--ink-2);
}

.card-back dd { font-size: 12px; line-height: 1.55; word-break: break-word; }

.card-back .tags dd { display: flex; flex-wrap: wrap; gap: 3px 8px; }

.mini-tag {
  font-size: 10px;
  color: var(--ink-2);
  border-bottom: 1px solid var(--line-soft);
  white-space: nowrap;
}
.mini-tag:hover { color: var(--ink); border-bottom-color: var(--line); }

.card-back a { color: var(--ink); text-underline-offset: 3px; }

.back-groups {
  margin-top: 10px;
  border-top: 1px solid var(--line-soft);
  padding-top: 8px;
}

.back-groups > span {
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--ink-2);
}

.group-checks {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin-top: 6px;
}

.group-check {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  cursor: pointer;
  user-select: none;
}
.group-check input { accent-color: var(--ink); width: 12px; height: 12px; margin: 0; }

.new-group-inline {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}
.new-group-inline input {
  flex: 1;
  min-width: 0;
  border: none;
  border-bottom: 1px solid var(--line-soft);
  background: transparent;
  font-size: 11px;
  padding: 2px 0;
  outline: none;
}
.new-group-inline button {
  font-size: 10px;
  letter-spacing: 0.1em;
  border: 1px solid var(--line);
  padding: 2px 8px;
  flex: none;
}

/* ---------------- Empty state / footer ---------------- */

.empty-state {
  padding: 80px 40px;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-2);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 18px 40px 28px;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink-2);
}

/* ---------------- Group panel ---------------- */

.group-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  max-width: 88vw;
  background: var(--bg);
  border-left: 1px solid var(--line);
  padding: 24px;
  overflow-y: auto;
  z-index: 50;
}

.gp-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  letter-spacing: 0.16em;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.gp-close { font-size: 18px; line-height: 1; padding: 2px 6px; }

.gp-create { display: flex; gap: 8px; margin: 16px 0 20px; }

.gp-create input {
  flex: 1;
  min-width: 0;
  border: none;
  border-bottom: 1px solid var(--line);
  background: transparent;
  padding: 4px 2px;
  font-size: 13px;
  outline: none;
}

.gp-create button {
  border: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 4px 12px;
  flex: none;
}
.gp-create button:hover { background: var(--accent-bg); color: var(--accent-ink); }

.gp-list { list-style: none; }

.gp-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
}

.gp-list .gname { flex: 1; cursor: pointer; }
.gp-list .gname:hover { text-decoration: underline; text-underline-offset: 3px; }
.gp-list .gcount { font-family: var(--mono); font-size: 11px; color: var(--ink-2); }
.gp-list .gdel { font-size: 10px; color: var(--ink-2); letter-spacing: 0.1em; }
.gp-list .gdel:hover { color: var(--ink); }

.gp-empty { font-size: 12px; color: var(--ink-2); padding: 12px 0; }

.gp-hint {
  margin-top: 20px;
  font-size: 10px;
  line-height: 1.8;
  color: var(--ink-2);
  letter-spacing: 0.04em;
}

/* ---------------- Responsive ---------------- */

@media (max-width: 1400px) { .grid { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
  .site-header { padding: 28px 24px 18px; }
  .toolbar, .tagbar-wrap, .status-line { padding-left: 24px; padding-right: 24px; }
  .site-footer { padding-left: 24px; padding-right: 24px; }
}
@media (max-width: 640px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .brand h1 { font-size: 22px; }
  .site-header { flex-direction: column; align-items: flex-start; }
  .search-box input { width: 100%; max-width: none; }
  .search-box { width: 100%; }
}
@media (max-width: 400px) { .grid { grid-template-columns: 1fr; } }

@media (prefers-reduced-motion: reduce) {
  .card-inner { transition: none; }
}