:root {
  --primary: #1D4E89;
  --secondary: #4DA8DA;
  --accent: #3FA34D;
  --warning: #F2C14E;
  --danger: #C1121F;
  --bg: #F7FAFC;
  --surface: #FFFFFF;
  --text: #0B1F33;
  --text-secondary: #334155;
  --border: #E2E8F0;
  --border-hover: #CBD5E1;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.04);
  --radius: 10px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif; }

.topbar {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 24px; background: var(--primary);
  box-shadow: var(--shadow-md); position: sticky; top: 0; z-index: 10;
  color: #fff;
}
.brand { font-weight: 700; font-size: 16px; letter-spacing: .3px; color: #fff; }
#search {
  flex: 1 1 auto; max-width: 480px; padding: 9px 14px;
  background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.25); border-radius: var(--radius);
  color: #fff; outline: none; font-size: 14px;
}
#search::placeholder { color: rgba(255,255,255,.7); }
#search:focus { background: rgba(255,255,255,.22); border-color: rgba(255,255,255,.5); }
#search::-webkit-search-cancel-button {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; cursor: pointer;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 4l8 8M12 4l-8 8' stroke='%23C1121F' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") center/contain no-repeat;
}
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: var(--radius); cursor: pointer;
  border: 1px solid rgba(255,255,255,.3); background: rgba(255,255,255,.12); color: #fff;
  font-size: 13px; font-weight: 500; line-height: 1; user-select: none;
  transition: background .15s, border-color .15s, transform .1s;
  text-decoration: none;
}
.btn:hover:not(:disabled) { background: rgba(255,255,255,.22); border-color: rgba(255,255,255,.5); transform: translateY(-1px); }
.btn:active:not(:disabled) { transform: translateY(0); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-danger:not(:disabled):hover { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover:not(:disabled) { background: rgba(255,255,255,.1); }

main { padding: 24px; max-width: 1600px; margin: 0 auto; }
.status { color: var(--text-secondary); margin-bottom: 14px; min-height: 1em; font-size: 13px; font-weight: 500; }

.grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
}
.card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; cursor: pointer; aspect-ratio: 1 / 1;
  box-shadow: var(--shadow); transition: box-shadow .15s, transform .15s;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card img { width: 100%; height: 100%; object-fit: cover; display: block; background: #f1f5f9; }
.card .name {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 8px 10px; font-size: 11px; color: #fff; font-weight: 500;
  background: linear-gradient(to top, rgba(0,0,0,.75) 0%, transparent 100%);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.card.selected { outline: 3px solid var(--secondary); outline-offset: -3px; }
.card .check {
  position: absolute; top: 8px; left: 8px; width: 24px; height: 24px;
  border-radius: 50%; background: rgba(255,255,255,.85); border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center; font-size: 13px;
  color: var(--primary); font-weight: 700; transition: background .15s;
}
.card.selected .check { background: var(--secondary); border-color: var(--secondary); color: #fff; }

.copy-url-btn {
  position: absolute; bottom: 32px; left: 8px; width: 28px; height: 28px;
  border-radius: 6px; background: rgba(255,255,255,.9); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; cursor: pointer; opacity: 0; transition: opacity .15s;
  z-index: 2; padding: 0; line-height: 1; color: var(--primary);
}
.card:hover .copy-url-btn { opacity: 1; }
.copy-url-btn:hover { background: var(--secondary); border-color: var(--secondary); color: #fff; }

.sentinel { height: 60px; }

.lightbox {
  position: fixed; inset: 0; background: rgba(0,0,0,.88);
  display: flex; align-items: center; justify-content: center; z-index: 100;
}
.lightbox.hidden { display: none; }
.lightbox img { max-width: 92vw; max-height: 88vh; object-fit: contain; border-radius: 4px; }
.lb-btn {
  position: absolute; background: rgba(255,255,255,.1); color: #fff;
  border: 0; cursor: pointer; padding: 12px 16px; border-radius: 8px; font-size: 22px;
  backdrop-filter: blur(4px);
}
.lb-btn:hover { background: rgba(255,255,255,.2); }
.lb-prev { left: 16px; top: 50%; transform: translateY(-50%); }
.lb-next { right: 16px; top: 50%; transform: translateY(-50%); }
.lb-close { top: 16px; right: 16px; padding: 6px 12px; }
#lb-caption { position: absolute; bottom: 16px; left: 0; right: 0; text-align: center; color: #eee; font-size: 13px; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--surface); border: 1px solid var(--border);
  padding: 12px 20px; border-radius: var(--radius); z-index: 200; max-width: 80vw;
  box-shadow: var(--shadow-md); font-size: 14px; font-weight: 500; color: var(--text);
}
.toast.hidden { display: none; }
.toast.error { border-color: var(--danger); color: var(--danger); background: #fef2f2; }

/* Folder cards */
.folder-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  aspect-ratio: 1 / 1; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer; transition: border-color .15s, box-shadow .15s, transform .15s;
  box-shadow: var(--shadow);
}
.folder-card:hover { border-color: var(--secondary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.folder-icon { font-size: 48px; margin-bottom: 8px; }
.folder-card .name {
  position: static; background: none; padding: 4px 8px;
  font-size: 12px; font-weight: 600; text-align: center; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 90%;
}
.folder-delete-btn {
  position: absolute; top: 8px; right: 8px; width: 28px; height: 28px;
  border-radius: 6px; background: rgba(255,255,255,.9); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; cursor: pointer; opacity: 0; transition: opacity .15s;
  z-index: 2; padding: 0; color: var(--danger);
}
.folder-card:hover .folder-delete-btn { opacity: 1; }
.folder-delete-btn:hover { background: var(--danger); border-color: var(--danger); color: #fff; }

/* Breadcrumb */
#breadcrumb {
  display: flex; align-items: center; gap: 0; flex-wrap: wrap;
  margin-bottom: 14px; font-size: 13px; color: var(--text-secondary);
  padding: 8px 14px; background: var(--surface); border-radius: var(--radius);
  border: 1px solid var(--border);
}
#breadcrumb .bc-link { cursor: pointer; color: var(--secondary); font-weight: 500; }
#breadcrumb .bc-link:hover { text-decoration: underline; color: var(--primary); }
#breadcrumb .bc-link.bc-current { color: var(--text); cursor: default; }
#breadcrumb .bc-sep { margin: 0 6px; color: var(--text-secondary); }

/* Drag & drop overlay */
.grid.drag-over {
  outline: 3px dashed var(--secondary); outline-offset: -3px;
  background: rgba(77, 168, 218, .06);
  border-radius: var(--radius);
}

/* Auth pages */
.auth-container {
  max-width: 400px; margin: 80px auto; padding: 36px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow-md);
}
.auth-container h2 { margin: 0 0 20px; font-size: 22px; color: var(--primary); font-weight: 700; }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form input {
  padding: 11px 14px; background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text); font-size: 14px; outline: none;
  transition: border-color .15s;
}
.auth-form input:focus { border-color: var(--secondary); box-shadow: 0 0 0 3px rgba(77,168,218,.12); }
.auth-form .btn {
  width: 100%; justify-content: center; margin-top: 4px;
  background: var(--primary); border-color: var(--primary); color: #fff;
  padding: 11px 14px; font-size: 14px; font-weight: 600;
}
.auth-form .btn:hover:not(:disabled) { background: #164070; border-color: #164070; }
.pw-field { position: relative; display: flex; }
.pw-field input { flex: 1; padding-right: 42px; }
.pw-toggle {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  background: none; border: none; cursor: pointer; font-size: 16px;
  padding: 4px; line-height: 1; opacity: .6; color: var(--text-secondary);
}
.pw-toggle:hover { opacity: 1; }
.auth-link { margin-top: 16px; font-size: 13px; color: var(--text-secondary); }
.auth-link a { color: var(--secondary); text-decoration: none; font-weight: 500; }
.auth-link a:hover { text-decoration: underline; color: var(--primary); }
.auth-hint { font-size: 13px; color: var(--text-secondary); margin-bottom: 12px; }
.resend-section { margin-top: 16px; }
.resend-section summary { cursor: pointer; color: var(--secondary); font-size: 13px; font-weight: 500; }
.resend-section summary:hover { text-decoration: underline; color: var(--primary); }
.resend-form { margin-top: 10px; gap: 8px; }
.btn-secondary { background: var(--secondary); }
.btn-secondary:hover { background: var(--primary); }
.flash { padding: 10px 14px; border-radius: var(--radius); margin-bottom: 14px; font-size: 13px; font-weight: 500; }
.flash.error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.flash.info { background: #eff6ff; color: var(--primary); border: 1px solid #bfdbfe; }

/* ---------- Admin Panel ---------- */
.admin-container { max-width: 900px; margin: 40px auto; padding: 0 24px; }
.admin-container h2 { color: var(--primary); margin-bottom: 8px; }
.btn-back { margin-bottom: 20px; display: inline-block; font-size: 13px; }
.admin-section { background: var(--surface); border-radius: var(--radius); padding: 20px 24px; margin-bottom: 24px; box-shadow: var(--shadow); }
.admin-section h3 { margin: 0 0 14px; color: var(--text); font-size: 15px; }
.admin-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.admin-form input, .admin-form select { padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 13px; }
.admin-form input:focus, .admin-form select:focus { outline: none; border-color: var(--secondary); }
.admin-table-wrap { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th { text-align: left; padding: 10px 12px; background: var(--bg); color: var(--text-secondary); font-weight: 600; border-bottom: 2px solid var(--border); }
.admin-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.admin-table tr:hover td { background: var(--bg); }
.actions-cell { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.inline-form { display: inline; }
.btn-sm { padding: 4px 10px; font-size: 12px; border-radius: 6px; }
.btn-warning { background: var(--warning); color: var(--text); }
.btn-warning:hover { background: #e0ac2e; }

/* Admin panel button overrides (light background context) */
.admin-container .btn {
  background: var(--primary); color: #fff; border: 1px solid var(--primary);
}
.admin-container .btn:hover:not(:disabled) {
  background: #164070; border-color: #164070; color: #fff; transform: translateY(-1px);
}
.admin-container .btn-danger {
  background: var(--danger); border-color: var(--danger); color: #fff;
}
.admin-container .btn-danger:hover:not(:disabled) {
  background: #9b0e19; border-color: #9b0e19;
}
.admin-container .btn-warning {
  background: var(--warning); border-color: var(--warning); color: var(--text);
}
.admin-container .btn-warning:hover:not(:disabled) {
  background: #e0ac2e; border-color: #e0ac2e; color: var(--text);
}
.admin-container .btn-ghost {
  background: transparent; border-color: var(--border); color: var(--secondary);
}
.admin-container .btn-ghost:hover:not(:disabled) {
  background: var(--bg); border-color: var(--secondary); color: var(--primary);
}
.admin-container .btn-back {
  background: transparent; border-color: transparent; color: var(--secondary);
}
.admin-container .btn-back:hover:not(:disabled) {
  background: transparent; color: var(--primary); border-color: transparent;
}
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 600; text-transform: uppercase; }
.badge-admin { background: var(--primary); color: #fff; }
.badge-user { background: var(--border); color: var(--text-secondary); }
.reset-pw-details { display: inline-block; }
.reset-pw-details summary { cursor: pointer; list-style: none; }
.reset-pw-details summary::-webkit-details-marker { display: none; }
.reset-pw-form { display: flex; gap: 6px; margin-top: 6px; align-items: center; }
.reset-pw-form input { padding: 4px 8px; font-size: 12px; border: 1px solid var(--border); border-radius: 6px; width: 140px; }