/* ================================================================
   极简图床 · 主页样式
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary:       #3b82f6;
  --primary-dark:  #2563eb;
  --primary-light: #eff6ff;
  --accent:        #8b5cf6;
  --success:       #10b981;
  --danger:        #ef4444;
  --warning:       #f59e0b;
  --info:          #06b6d4;

  --bg:            #f1f5f9;
  --bg-grad:       linear-gradient(135deg, #e0e7ff 0%, #f1f5f9 50%, #e0f2fe 100%);
  --card-bg:       rgba(255,255,255,0.85);
  --card-blur:     blur(16px);
  --text:          #1e293b;
  --text-muted:    #64748b;
  --border:        rgba(148,163,184,0.3);
  --shadow-sm:     0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:     0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
  --shadow-lg:     0 20px 40px rgba(0,0,0,.12), 0 8px 16px rgba(0,0,0,.06);
  --radius-sm:     8px;
  --radius-md:     12px;
  --radius-lg:     20px;
  --transition:    all .25s cubic-bezier(.4,0,.2,1);
}
body.dark {
  --bg:            #0f172a;
  --bg-grad:       linear-gradient(135deg, #1e1b4b 0%, #0f172a 50%, #0c1a2e 100%);
  --card-bg:       rgba(30,41,59,0.85);
  --text:          #e2e8f0;
  --text-muted:    #94a3b8;
  --border:        rgba(71,85,105,0.4);
  --shadow-sm:     0 1px 3px rgba(0,0,0,.3);
  --shadow-md:     0 4px 16px rgba(0,0,0,.4);
  --shadow-lg:     0 20px 40px rgba(0,0,0,.5);
  --primary-light: rgba(59,130,246,.15);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-grad);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
  transition: background .4s, color .3s;
  line-height: 1.6;
}
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(100,116,139,.35); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(100,116,139,.6); }
.topbar {
  position: fixed; top: 0; left: 0; right: 0; height: 60px;
  background: var(--card-bg); backdrop-filter: var(--card-blur); -webkit-backdrop-filter: var(--card-blur);
  border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; z-index: 100; box-shadow: var(--shadow-sm);
}
.topbar-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.topbar-brand .logo-icon { font-size: 22px; }
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn, .admin-link { transition: var(--transition); }
.icon-btn { width: 36px; height: 36px; border: 1px solid var(--border); background: var(--card-bg); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 16px; color: var(--text); }
.icon-btn:hover { background: var(--primary); border-color: var(--primary); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.admin-link { display: flex; align-items: center; gap: 6px; padding: 6px 14px; background: linear-gradient(135deg, rgba(59,130,246,.1), rgba(139,92,246,.1)); border: 1px solid rgba(59,130,246,.25); border-radius: var(--radius-sm); color: var(--primary); text-decoration: none; font-size: 13px; font-weight: 500; }
.admin-link:hover { background: linear-gradient(135deg, rgba(59,130,246,.2), rgba(139,92,246,.2)); transform: translateY(-1px); }
.container { max-width: 1100px; margin: 0 auto; padding: 80px 20px 40px; }
.hero { text-align: center; padding: 40px 0 32px; }
.hero h1 { font-size: clamp(24px, 4vw, 36px); font-weight: 700; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 8px; }
.hero p { color: var(--text-muted); font-size: 15px; }
.upload-card, .options-card, .card, .modal-box, .music-player { backdrop-filter: var(--card-blur); -webkit-backdrop-filter: var(--card-blur); }
.upload-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); overflow: hidden; margin-bottom: 24px; }
.upload-area { border: 2px dashed var(--border); border-radius: var(--radius-md); margin: 24px; padding: 44px 24px; text-align: center; cursor: pointer; transition: var(--transition); position: relative; overflow: hidden; }
.upload-area::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(59,130,246,.04), rgba(139,92,246,.04)); opacity: 0; transition: opacity .3s; }
.upload-area:hover { border-color: var(--primary); }
.upload-area:hover::before { opacity: 1; }
.upload-area.dragover { border-color: var(--primary); background: var(--primary-light); transform: scale(1.01); }
.upload-icon { width: 72px; height: 72px; background: linear-gradient(135deg, rgba(59,130,246,.12), rgba(139,92,246,.12)); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 28px; margin: 0 auto 16px; transition: var(--transition); }
.upload-area:hover .upload-icon { background: linear-gradient(135deg, rgba(59,130,246,.2), rgba(139,92,246,.2)); transform: scale(1.08); }
.upload-area h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.upload-area p { color: var(--text-muted); font-size: 13px; }
.upload-area input[type="file"] { display: none; }
.preview-section { padding: 0 24px 20px; }
.preview-area { display: flex; flex-wrap: wrap; gap: 10px; min-height: 80px; padding: 12px; background: rgba(0,0,0,.02); border: 1px solid var(--border); border-radius: var(--radius-md); align-items: flex-start; }
body.dark .preview-area { background: rgba(255,255,255,.02); }
.preview-empty { width: 100%; text-align: center; color: var(--text-muted); font-size: 13px; padding: 20px 0; }
.preview-item { position: relative; width: 88px; height: 88px; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow-sm); transition: var(--transition); }
.preview-item:hover { transform: scale(1.04); box-shadow: var(--shadow-md); }
.preview-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.preview-remove { position: absolute; top: 3px; right: 3px; width: 20px; height: 20px; background: rgba(239,68,68,.85); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 11px; cursor: pointer; opacity: 0; transition: opacity .2s; }
.preview-item:hover .preview-remove { opacity: 1; }
.upload-footer { display: flex; align-items: center; gap: 12px; padding: 16px 24px; border-top: 1px solid var(--border); background: rgba(0,0,0,.015); }
body.dark .upload-footer { background: rgba(255,255,255,.02); }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 20px; border: none; border-radius: var(--radius-sm); font-size: 14px; font-weight: 500; cursor: pointer; transition: var(--transition); white-space: nowrap; font-family: inherit; }
.btn:active { transform: scale(.97); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; box-shadow: 0 4px 12px rgba(59,130,246,.35); }
.btn-primary:hover { box-shadow: 0 6px 20px rgba(59,130,246,.45); transform: translateY(-1px); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text-muted); }
.btn-ghost:hover { background: var(--border); color: var(--text); }
.file-count-badge { font-size: 12px; color: var(--text-muted); margin-left: auto; }
.options-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); margin-bottom: 24px; overflow: hidden; }
.options-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; border-bottom: 1px solid var(--border); cursor: pointer; user-select: none; }
.options-header h3 { font-size: 15px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.options-toggle-icon { font-size: 13px; color: var(--text-muted); transition: transform .35s cubic-bezier(.4,0,.2,1); }
.options-toggle-icon.open { transform: rotate(180deg); }
.options-body { padding: 0 24px; max-height: 0; overflow: hidden; opacity: 0; transition: max-height .45s cubic-bezier(.4,0,.2,1), opacity .25s ease, padding .35s ease; }
.options-body.open { max-height: 1000px; opacity: 1; padding: 20px 24px; }
.option-group { padding: 14px 0; border-bottom: 1px solid var(--border); }
.option-group:last-child { border-bottom: none; padding-bottom: 0; }
.option-group:first-child { padding-top: 0; }
.option-label { display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 500; cursor: pointer; }
.option-label input[type="checkbox"] { width: 17px; height: 17px; accent-color: var(--primary); cursor: pointer; }
.option-details { margin-top: 0; padding: 0 16px; background: rgba(0,0,0,.025); border-radius: var(--radius-sm); border: 1px solid var(--border); max-height: 0; overflow: hidden; opacity: 0; transition: max-height .35s ease, opacity .25s ease, margin-top .25s ease, padding .25s ease; }
body.dark .option-details { background: rgba(255,255,255,.03); }
.option-details.open { margin-top: 14px; padding: 14px 16px; max-height: 220px; opacity: 1; }
.option-row { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.option-row:last-child { margin-bottom: 0; }
.option-row label { font-size: 13px; color: var(--text-muted); min-width: 100px; }
.range-wrapper { flex: 1; display: flex; align-items: center; gap: 10px; }
.range-wrapper input[type="range"] { flex: 1; accent-color: var(--primary); height: 4px; }
.range-value { font-size: 13px; font-weight: 600; color: var(--primary); min-width: 36px; text-align: right; }
input[type="number"], input[type="datetime-local"] { padding: 7px 11px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--card-bg); color: var(--text); font-size: 13px; font-family: inherit; transition: border-color .2s; }
input[type="number"]:focus, input[type="datetime-local"]:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,.12); }
input[type="number"] { width: 90px; }
input[type="datetime-local"] { width: 210px; }
.option-note { font-size: 12px; color: var(--text-muted); margin-top: 8px; display: flex; align-items: flex-start; gap: 4px; }
.gallery-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.gallery-header h2 { font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.gallery-count { font-size: 13px; color: var(--text-muted); background: var(--border); padding: 2px 10px; border-radius: 99px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 18px; }
.gallery-empty { grid-column: 1 / -1; text-align: center; padding: 60px 20px; color: var(--text-muted); font-size: 15px; }
.gallery-empty .empty-icon { font-size: 48px; display: block; margin-bottom: 12px; opacity: .6; }
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); overflow: hidden; transition: var(--transition); animation: cardIn .3s ease; }
@keyframes cardIn { from { opacity: 0; transform: translateY(10px) scale(.97); } to { opacity: 1; transform: translateY(0) scale(1); } }
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.card-img-wrapper { position: relative; overflow: hidden; aspect-ratio: 4/3; background: linear-gradient(135deg, #f1f5f9, #e2e8f0); }
body.dark .card-img-wrapper { background: linear-gradient(135deg, #1e293b, #0f172a); }
.card-img-wrapper img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s ease; }
.card:hover .card-img-wrapper img { transform: scale(1.06); }
.card-img-overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.6) 0%, transparent 50%); opacity: 0; transition: opacity .3s; display: flex; align-items: flex-end; padding: 12px; }
.card:hover .card-img-overlay { opacity: 1; }
.card-overlay-link { color: #fff; font-size: 12px; text-decoration: none; display: flex; align-items: center; gap: 4px; }
.card-body { padding: 12px; }
.card-filename { font-size: 13px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-bottom: 10px; color: var(--text); }
.card-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.card-btn { display: flex; align-items: center; justify-content: center; gap: 4px; padding: 6px 8px; border: none; border-radius: 6px; font-size: 11px; font-weight: 500; cursor: pointer; transition: var(--transition); font-family: inherit; }
.card-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.card-btn-copy { background: rgba(16,185,129,.12); color: var(--success); }
.card-btn-delete { background: rgba(239,68,68,.1); color: var(--danger); }
.card-btn-qr { background: rgba(59,130,246,.1); color: var(--primary); }
.card-btn-info { background: rgba(245,158,11,.1); color: var(--warning); }
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.55); z-index: 2000; align-items: center; justify-content: center; padding: 20px; backdrop-filter: blur(4px); animation: fadeIn .2s ease; }
.modal-overlay.show { display: flex; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-box { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; max-width: 480px; width: 100%; box-shadow: var(--shadow-lg); animation: slideUp .3s cubic-bezier(.34,1.56,.64,1); }
@keyframes slideUp { from { opacity: 0; transform: translateY(30px) scale(.95); } to { opacity: 1; transform: translateY(0) scale(1); } }
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.modal-header h3 { font-size: 16px; font-weight: 600; }
.modal-close { width: 28px; height: 28px; border: none; background: rgba(0,0,0,.06); border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 14px; color: var(--text-muted); transition: var(--transition); }
.modal-close:hover { background: rgba(239,68,68,.12); color: var(--danger); }
.modal-footer { margin-top: 18px; text-align: right; }
.qr-container { text-align: center; padding: 12px 0; }
.qr-container canvas { border-radius: var(--radius-sm); }
.info-pre { background: rgba(0,0,0,.04); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px; font-size: 12px; font-family: 'JetBrains Mono', 'Fira Code', monospace; white-space: pre-wrap; word-break: break-all; max-height: 300px; overflow-y: auto; color: var(--text); }
body.dark .info-pre { background: rgba(255,255,255,.04); }
.toast { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px); background: #1e293b; color: #f1f5f9; padding: 12px 22px; border-radius: 99px; font-size: 14px; font-weight: 500; opacity: 0; pointer-events: none; z-index: 9999; transition: opacity .25s, transform .25s; box-shadow: 0 8px 24px rgba(0,0,0,.3); white-space: nowrap; max-width: 90vw; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.music-player { position: fixed; bottom: 28px; right: 24px; background: var(--card-bg); border: 1px solid var(--border); border-radius: 99px; padding: 10px 18px; display: flex; align-items: center; gap: 10px; box-shadow: var(--shadow-md); z-index: 500; cursor: pointer; transition: var(--transition); }
.music-player:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.music-disc { width: 30px; height: 30px; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; animation: spin 3s linear infinite; flex-shrink: 0; }
.music-disc.paused { animation-play-state: paused; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.music-info { min-width: 0; }
.music-title { font-size: 12px; font-weight: 600; color: var(--text); }
.music-status { font-size: 11px; color: var(--text-muted); }
.upload-progress { display: none; height: 3px; background: var(--border); border-radius: 99px; overflow: hidden; margin: 0 24px 16px; }
.upload-progress.show { display: block; }
.upload-progress-bar { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 99px; transition: width .3s; animation: progressPulse 1.5s ease-in-out infinite; }
@keyframes progressPulse { 0%, 100% { opacity: 1; } 50% { opacity: .7; } }
@media (max-width: 640px) {
  .container { padding-top: 76px; }
  .topbar { padding: 0 16px; }
  .gallery { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
  .upload-area { padding: 32px 16px; }
  .options-body { padding: 0 16px; }
  .options-body.open { padding: 16px; }
  .music-player { bottom: 20px; right: 16px; padding: 8px 14px; }
  input[type="datetime-local"] { width: 100%; }
}