/* =========================================================
   ImageTiles — Signal Media  |  main.css
   ========================================================= */

:root {
  --brand-primary:   #1a1f2e;
  --brand-accent:    #4f8ef7;
  --brand-accent-dk: #2d6fd4;
  --brand-surface:   #232938;
  --brand-surface2:  #2d3447;
  --brand-border:    #3a4159;
  --brand-text:      #e8eaf0;
  --brand-muted:     #8890a4;
  --brand-danger:    #e05a5a;
  --brand-success:   #4caf81;
  --brand-warn:      #e8a940;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-card: 0 4px 24px rgba(0,0,0,.35);
  --shadow-btn:  0 2px 8px rgba(79,142,247,.25);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--brand-primary);
  color: var(--brand-text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--brand-accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--brand-accent-dk); }

img { max-width: 100%; display: block; }

/* ── Typography ───────────────────────────────────────────── */
h1, h2, h3, h4 { font-weight: 600; line-height: 1.25; letter-spacing: -.01em; }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }

.text-muted   { color: var(--brand-muted); }
.text-accent  { color: var(--brand-accent); }
.text-danger  { color: var(--brand-danger); }
.text-success { color: var(--brand-success); }
.text-warn    { color: var(--brand-warn); }
.text-sm      { font-size: .875rem; }
.text-xs      { font-size: .75rem; }
.text-mono    { font-family: var(--font-mono); }

/* ── Layout ───────────────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.container--narrow { max-width: 760px; }
.container--wide   { max-width: 1600px; }

.page-wrap { display: flex; flex-direction: column; min-height: 100vh; }
.page-content { flex: 1; padding: 2.5rem 0; }

/* ── Header / Nav ─────────────────────────────────────────── */
.site-header {
  background: var(--brand-surface);
  border-bottom: 1px solid var(--brand-border);
  position: sticky; top: 0; z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: .65rem;
  text-decoration: none;
}

.site-logo__icon {
  width: 32px; height: 32px;
  background: var(--brand-accent);
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  flex-shrink: 0;
}

.site-logo__icon svg { width: 18px; height: 18px; color: #fff; }

.site-logo__wordmark { display: flex; flex-direction: column; line-height: 1.1; }
.site-logo__name  { font-size: 1rem; font-weight: 700; color: var(--brand-text); }
.site-logo__brand { font-size: .65rem; font-weight: 500; color: var(--brand-muted); letter-spacing: .08em; text-transform: uppercase; }

.site-nav { display: flex; align-items: center; gap: 1.5rem; }
.site-nav a { font-size: .9rem; font-weight: 500; color: var(--brand-muted); transition: color .2s; }
.site-nav a:hover, .site-nav a.active { color: var(--brand-text); }

/* ── Footer ───────────────────────────────────────────────── */
.site-footer {
  background: var(--brand-surface);
  border-top: 1px solid var(--brand-border);
  padding: 1.25rem 0;
  text-align: center;
  font-size: .8rem;
  color: var(--brand-muted);
}

/* ── Cards ────────────────────────────────────────────────── */
.card {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.card__header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--brand-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.card__body { padding: 1.5rem; }
.card__footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--brand-border);
  background: var(--brand-surface2);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background .18s, box-shadow .18s, border-color .18s, opacity .18s;
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn--primary {
  background: var(--brand-accent);
  color: #fff;
  border-color: var(--brand-accent);
}
.btn--primary:hover { background: var(--brand-accent-dk); border-color: var(--brand-accent-dk); box-shadow: var(--shadow-btn); }

.btn--secondary {
  background: var(--brand-surface2);
  color: var(--brand-text);
  border-color: var(--brand-border);
}
.btn--secondary:hover { background: var(--brand-border); }

.btn--danger {
  background: transparent;
  color: var(--brand-danger);
  border-color: var(--brand-danger);
}
.btn--danger:hover { background: var(--brand-danger); color: #fff; }

.btn--ghost {
  background: transparent;
  color: var(--brand-muted);
  border-color: transparent;
}
.btn--ghost:hover { color: var(--brand-text); background: var(--brand-surface2); }

.btn--sm { padding: .35rem .75rem; font-size: .8rem; }
.btn--lg { padding: .75rem 1.5rem; font-size: 1rem; }

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ── Forms ────────────────────────────────────────────────── */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  margin-bottom: .4rem;
  color: var(--brand-text);
}
.form-group label .req { color: var(--brand-danger); margin-left: 2px; }

.form-control {
  width: 100%;
  background: var(--brand-primary);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  color: var(--brand-text);
  font-family: inherit;
  font-size: .95rem;
  padding: .6rem .85rem;
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}

.form-control:focus {
  border-color: var(--brand-accent);
  box-shadow: 0 0 0 3px rgba(79,142,247,.15);
}

.form-control::placeholder { color: var(--brand-muted); }

textarea.form-control { resize: vertical; min-height: 90px; }

.form-hint { font-size: .8rem; color: var(--brand-muted); margin-top: .3rem; }
.form-error { font-size: .8rem; color: var(--brand-danger); margin-top: .3rem; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }

/* Radio / checkbox group */
.radio-group { display: flex; gap: 1rem; flex-wrap: wrap; }
.radio-option {
  display: flex;
  align-items: center;
  gap: .5rem;
  cursor: pointer;
  padding: .5rem .9rem;
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  transition: border-color .2s, background .2s;
}
.radio-option:has(input:checked) { border-color: var(--brand-accent); background: rgba(79,142,247,.08); }
.radio-option input { accent-color: var(--brand-accent); }

/* ── Alert / Flash ────────────────────────────────────────── */
.alert {
  padding: .85rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: .9rem;
  display: flex;
  align-items: flex-start;
  gap: .65rem;
}
.alert svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px; }
.alert--success { background: rgba(76,175,129,.12); border-color: rgba(76,175,129,.3); color: var(--brand-success); }
.alert--error   { background: rgba(224,90,90,.12); border-color: rgba(224,90,90,.3); color: var(--brand-danger); }
.alert--warn    { background: rgba(232,169,64,.12); border-color: rgba(232,169,64,.3); color: var(--brand-warn); }
.alert--info    { background: rgba(79,142,247,.1); border-color: rgba(79,142,247,.25); color: var(--brand-accent); }

/* ── Badges ───────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .2rem .55rem;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.badge--public   { background: rgba(76,175,129,.15); color: var(--brand-success); border: 1px solid rgba(76,175,129,.3); }
.badge--private  { background: rgba(232,169,64,.15); color: var(--brand-warn); border: 1px solid rgba(232,169,64,.3); }
.badge--locked   { background: rgba(224,90,90,.12); color: var(--brand-danger); border: 1px solid rgba(224,90,90,.25); }

/* ── Table ────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}

table th {
  text-align: left;
  padding: .75rem 1rem;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--brand-muted);
  border-bottom: 1px solid var(--brand-border);
  white-space: nowrap;
}

table td {
  padding: .85rem 1rem;
  border-bottom: 1px solid rgba(58,65,89,.5);
  vertical-align: middle;
}

table tr:last-child td { border-bottom: none; }
table tbody tr:hover { background: rgba(255,255,255,.025); }

/* ── Upload drop zone ─────────────────────────────────────── */
.dropzone {
  border: 2px dashed var(--brand-border);
  border-radius: var(--radius-md);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
}

.dropzone:hover, .dropzone.drag-over {
  border-color: var(--brand-accent);
  background: rgba(79,142,247,.04);
}

.dropzone input[type="file"] {
  position: absolute; inset: 0;
  opacity: 0; cursor: pointer; width: 100%; height: 100%;
}

.dropzone__icon { margin: 0 auto .75rem; color: var(--brand-muted); width: 48px; height: 48px; }
.dropzone__label { font-size: 1rem; font-weight: 500; color: var(--brand-text); margin-bottom: .35rem; }
.dropzone__hint  { font-size: .8rem; color: var(--brand-muted); }
.dropzone__filename { font-size: .85rem; color: var(--brand-accent); margin-top: .5rem; font-weight: 500; }

/* ── Image Grid (gallery) ─────────────────────────────────── */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.image-card {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
  display: flex; flex-direction: column;
}

.image-card:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,.4); }

.image-card__thumb {
  aspect-ratio: 16/9;
  background: var(--brand-surface2);
  overflow: hidden;
  position: relative;
}

.image-card__thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .3s;
}

.image-card:hover .image-card__thumb img { transform: scale(1.04); }

.image-card__thumb--placeholder {
  display: grid; place-items: center; color: var(--brand-border);
}
.image-card__thumb--placeholder svg { width: 40px; height: 40px; }

.image-card__body { padding: 1rem; flex: 1; }
.image-card__title { font-size: 1rem; font-weight: 600; margin-bottom: .3rem; }
.image-card__desc  { font-size: .82rem; color: var(--brand-muted); display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.image-card__footer {
  padding: .75rem 1rem;
  border-top: 1px solid var(--brand-border);
  display: flex; align-items: center; justify-content: space-between;
  font-size: .78rem; color: var(--brand-muted);
}

/* ── Progress bar (upload) ────────────────────────────────── */
.progress-wrap {
  display: none;
  margin-top: 1rem;
}
.progress-wrap.visible { display: block; }
.progress-bar {
  height: 6px;
  background: var(--brand-surface2);
  border-radius: 999px;
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--brand-accent), #7eb3ff);
  border-radius: 999px;
  transition: width .3s;
  width: 0%;
}
.progress-label { font-size: .8rem; color: var(--brand-muted); margin-top: .4rem; }

/* ── Viewer page ──────────────────────────────────────────── */
.viewer-layout {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 60px);
}

.viewer-toolbar {
  background: var(--brand-surface);
  border-bottom: 1px solid var(--brand-border);
  padding: .75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.viewer-toolbar__info { display: flex; flex-direction: column; gap: .15rem; }
.viewer-toolbar__title { font-size: 1.05rem; font-weight: 600; }
.viewer-toolbar__meta  { font-size: .78rem; color: var(--brand-muted); }

.viewer-toolbar__actions { display: flex; align-items: center; gap: .75rem; }

.viewer-canvas-wrap { flex: 1; position: relative; overflow: hidden; background: #0e1118; }

#osd-viewer { width: 100%; height: 100%; }

.viewer-controls {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: .5rem;
  background: rgba(26,31,46,.85);
  border: 1px solid var(--brand-border);
  border-radius: 999px;
  padding: .4rem .75rem;
  backdrop-filter: blur(8px);
}

.viewer-controls .btn { border-radius: 999px; padding: .4rem .9rem; font-size: .82rem; }

/* ── Share panel ──────────────────────────────────────────── */
.share-panel {
  background: var(--brand-surface2);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}

.share-panel input[type="text"] {
  flex: 1; min-width: 200px;
  background: var(--brand-primary);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  color: var(--brand-text);
  font-family: var(--font-mono);
  font-size: .82rem;
  padding: .5rem .75rem;
  outline: none;
}

.share-panel input[type="text"]:focus { border-color: var(--brand-accent); }

/* ── Admin sidebar layout ─────────────────────────────────── */
.admin-layout {
  display: flex;
  min-height: calc(100vh - 60px);
}

.admin-sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--brand-surface);
  border-right: 1px solid var(--brand-border);
  padding: 1.5rem 0;
  display: flex; flex-direction: column; gap: .25rem;
}

.admin-sidebar__section {
  padding: .5rem 1.25rem .25rem;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--brand-muted);
  margin-top: .5rem;
}

.admin-sidebar a {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: .6rem 1.25rem;
  font-size: .88rem;
  font-weight: 500;
  color: var(--brand-muted);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: color .15s, background .15s, border-color .15s;
}

.admin-sidebar a:hover { color: var(--brand-text); background: rgba(255,255,255,.03); }
.admin-sidebar a.active { color: var(--brand-text); border-left-color: var(--brand-accent); background: rgba(79,142,247,.06); }
.admin-sidebar a svg { width: 16px; height: 16px; flex-shrink: 0; }

.admin-main { flex: 1; padding: 2rem 2.5rem; min-width: 0; }
.admin-main .page-title { margin-bottom: 1.75rem; }
.admin-main .page-title h1 { font-size: 1.5rem; }
.admin-main .page-title p { color: var(--brand-muted); font-size: .9rem; margin-top: .25rem; }

/* ── Stats grid ───────────────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.stat-card {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}
.stat-card__label { font-size: .75rem; font-weight: 600; color: var(--brand-muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: .5rem; }
.stat-card__value { font-size: 2rem; font-weight: 700; line-height: 1; }
.stat-card__sub   { font-size: .8rem; color: var(--brand-muted); margin-top: .3rem; }

/* ── Login page ───────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--brand-primary);
  background-image: radial-gradient(ellipse at 20% 50%, rgba(79,142,247,.06) 0%, transparent 60%),
                    radial-gradient(ellipse at 80% 20%, rgba(79,142,247,.04) 0%, transparent 50%);
  padding: 2rem;
}

.login-card {
  width: 100%; max-width: 400px;
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.login-card__header {
  padding: 2rem 2rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--brand-border);
}

.login-card__logo { margin-bottom: 1rem; }
.login-card__logo .site-logo { justify-content: center; }

.login-card__body { padding: 1.75rem 2rem 2rem; }

/* ── Thumbnail strip ──────────────────────────────────────── */
.thumb-strip { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: .75rem; }
.thumb-item {
  width: 72px; height: 72px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--brand-border);
  overflow: hidden; background: var(--brand-surface2);
}
.thumb-item img { width: 100%; height: 100%; object-fit: cover; }

/* ── Embed code ───────────────────────────────────────────── */
.embed-code {
  background: var(--brand-primary);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  padding: .75rem 1rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--brand-muted);
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.6;
}

/* ── Password gate ────────────────────────────────────────── */
.password-gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

/* ── Tabs ─────────────────────────────────────────────────── */
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--brand-border); margin-bottom: 1.5rem; }
.tab {
  padding: .65rem 1.1rem;
  font-size: .88rem;
  font-weight: 500;
  color: var(--brand-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color .15s, border-color .15s;
  text-decoration: none;
}
.tab:hover { color: var(--brand-text); }
.tab.active { color: var(--brand-accent); border-bottom-color: var(--brand-accent); }

/* ── Tag chips ────────────────────────────────────────────── */
.tag-list { display: flex; gap: .4rem; flex-wrap: wrap; }
.tag {
  padding: .2rem .6rem;
  border-radius: 999px;
  font-size: .72rem;
  background: var(--brand-surface2);
  color: var(--brand-muted);
  border: 1px solid var(--brand-border);
}

/* ── Utilities ────────────────────────────────────────────── */
.d-flex     { display: flex; }
.d-grid     { display: grid; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm  { gap: .5rem; }
.gap-md  { gap: 1rem; }
.gap-lg  { gap: 1.5rem; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: .5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.w-full { width: 100%; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .admin-layout { flex-direction: column; }
  .admin-sidebar { width: 100%; flex-direction: row; overflow-x: auto; padding: .5rem 0; border-right: none; border-bottom: 1px solid var(--brand-border); }
  .admin-sidebar__section { display: none; }
  .admin-sidebar a { border-left: none; border-bottom: 3px solid transparent; padding: .5rem .9rem; }
  .admin-sidebar a.active { border-bottom-color: var(--brand-accent); border-left-color: transparent; }
  .admin-main { padding: 1.5rem 1rem; }
}

@media (max-width: 600px) {
  h1 { font-size: 1.5rem; }
  .viewer-toolbar { padding: .6rem 1rem; }
  .image-grid { grid-template-columns: 1fr; }
}

/* ── Spinner ──────────────────────────────────────────────── */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  display: inline-block;
  width: 20px; height: 20px;
  border: 2px solid var(--brand-border);
  border-top-color: var(--brand-accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

/* ── Fade in ──────────────────────────────────────────────── */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.fade-in { animation: fadeIn .35s ease both; }