*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

:root {
  --bg: #080808;
  --surface: #111;
  --surface2: #1a1a1a;
  --border: #222;
  --border2: #2e2e2e;
  --text: #f0f0f0;
  --muted: #666;
  --muted2: #444;
  --accent: #fff;
  --chip-bg: #161616;
  --chip-active: #f0f0f0;
  --chip-active-text: #080808;
  --radius: .75rem;
  --header-h: 56px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 10;
}

.site-title {
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: -.03em;
  color: var(--text);
}

nav {
  display: flex;
  gap: .25rem;
}

nav a {
  padding: .35rem .75rem;
  border-radius: 999px;
  font-size: .8rem;
  color: var(--muted);
  border: 1px solid transparent;
  transition: color .15s, border-color .15s;
}

nav a:hover {
  color: var(--text);
  border-color: var(--border2);
}

/* ── Tag bar ── */
.tag-bar {
  display: flex;
  gap: .4rem;
  flex-wrap: wrap;
  padding: .875rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.tag-chip {
  padding: .3rem .7rem;
  border-radius: 999px;
  background: var(--chip-bg);
  border: 1px solid var(--border);
  font-size: .75rem;
  letter-spacing: .01em;
  cursor: pointer;
  color: var(--muted);
  transition: all .15s;
}

.tag-chip:hover {
  color: var(--text);
  border-color: var(--border2);
}

.tag-chip.active {
  background: var(--chip-active);
  color: var(--chip-active-text);
  border-color: var(--chip-active);
  font-weight: 500;
}

.tag-count {
  font-size: .7rem;
  opacity: .5;
  margin-left: .1rem;
}

/* ── Grid ── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1px;
  background: var(--border);
}

.thumb {
  display: block;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--surface);
  position: relative;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s cubic-bezier(.25,.46,.45,.94), opacity .2s;
}

.thumb:hover img {
  transform: scale(1.03);
  opacity: .9;
}

.empty {
  grid-column: 1/-1;
  padding: 5rem 1rem;
  text-align: center;
  color: var(--muted);
  font-size: .9rem;
}

/* ── Photo detail ── */
.photo-view {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: calc(100dvh - var(--header-h));
  padding: 1.5rem 1rem 2rem;
  gap: 1.5rem;
}

.full-img {
  max-width: 100%;
  max-height: 78dvh;
  object-fit: contain;
  border-radius: .5rem;
}

.photo-meta {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
}

.photo-meta h1 {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -.02em;
}

.photo-meta time {
  font-size: .78rem;
  color: var(--muted);
}

.photo-meta .tags {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  justify-content: center;
}

.photo-nav {
  display: flex;
  gap: .5rem;
  align-items: center;
}

.nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  transition: background .15s, border-color .15s;
  user-select: none;
}

.nav-btn:hover {
  background: var(--surface2);
  border-color: var(--border2);
}

.nav-btn.disabled {
  opacity: .2;
  cursor: default;
  pointer-events: none;
}

/* ── Upload ── */
.upload-wrap {
  max-width: 520px;
  margin: 2.5rem auto;
  padding: 0 1rem;
}

.login-card, .upload-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.login-card h2, .upload-card h2 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -.02em;
}

input[type=text], input[type=password], input[type=date] {
  width: 100%;
  padding: .65rem .875rem;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: .625rem;
  color: var(--text);
  font-size: .875rem;
  transition: border-color .15s;
}

input:focus {
  outline: none;
  border-color: var(--muted);
}

.drop-zone {
  border: 1px dashed var(--border2);
  border-radius: var(--radius);
  padding: 2.5rem;
  text-align: center;
  color: var(--muted);
  font-size: .875rem;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}

.drop-zone:hover, .drop-zone.over {
  border-color: var(--muted);
  background: var(--surface2);
}

#previews {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

#previews img {
  width: 76px;
  height: 76px;
  object-fit: cover;
  border-radius: .5rem;
  border: 1px solid var(--border);
}

.tag-chips {
  display: flex;
  flex-wrap: wrap;
  gap: .375rem;
}

.tag-chips .tag-chip {
  cursor: pointer;
}

.tag-chips .tag-chip.selected {
  background: var(--chip-active);
  color: var(--chip-active-text);
  border-color: var(--chip-active);
  font-weight: 500;
}

.form-group { display: flex; flex-direction: column; gap: .375rem; }

.upload-btn {
  padding: .75rem;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: .625rem;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: -.01em;
  transition: opacity .15s;
}

.upload-btn:hover { opacity: .88; }
.upload-btn:disabled { opacity: .4; cursor: wait; }

.logout-btn {
  background: none;
  border: 1px solid var(--border2);
  color: var(--muted);
  padding: .4rem .875rem;
  border-radius: .5rem;
  cursor: pointer;
  font-size: .8rem;
  transition: border-color .15s, color .15s;
}

.logout-btn:hover { color: var(--text); border-color: var(--muted2); }

#upload-status {
  font-size: .8rem;
  color: var(--muted);
  min-height: 1.2rem;
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .full-img { max-height: 65dvh; }
}