/* ═══════════════════════════════════════════
   AC Final Papers — Admin Panel Styles
═══════════════════════════════════════════ */

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

:root {
  --primary:      #1d4ed8;
  --primary-l:    #3b82f6;
  --green:        #059669;
  --green-l:      #10b981;
  --red:          #ef4444;
  --amber:        #f59e0b;
  --bg:           #f1f5f9;
  --card:         #ffffff;
  --border:       #e2e8f0;
  --text:         #0f172a;
  --text2:        #334155;
  --muted:        #64748b;
  --sidebar-w:    240px;
  --header-h:     64px;
  --radius:       12px;
  --transition:   all .2s ease;
}

html, body { height: 100%; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* ═══ AUTH GATE ═══ */
.auth-gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eff6ff, #f5f3ff);
  padding: 20px;
}

.gate-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  max-width: 380px;
  width: 100%;
  box-shadow: 0 8px 40px rgba(0,0,0,.08);
}

.gate-logo {
  width: 60px; height: 60px;
  background: linear-gradient(135deg, var(--primary), var(--primary-l));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: #fff;
  margin: 0 auto 20px;
  box-shadow: 0 4px 16px rgba(29,78,216,.3);
}

.gate-card h2 { font-size: 22px; font-weight: 800; color: var(--text); margin-bottom: 8px; }
.gate-card p  { font-size: 14px; color: var(--muted); margin-bottom: 24px; line-height: 1.6; }

.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 12px 20px;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 12px;
}
.btn-google img { width: 20px; height: 20px; }
.btn-google:hover { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,.12); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-l));
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary:hover { opacity: .9; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  padding: 8px 0;
}
.back-link:hover { color: var(--primary); }

/* ═══ ADMIN LAYOUT ═══ */
#adminPanel {
  display: flex;
  min-height: 100vh;
}

/* ─── Sidebar ─── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--text);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0; top: 0; bottom: 0;
  z-index: 40;
  transition: var(--transition);
  overflow-y: auto;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 18px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.sidebar-logo .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-l));
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: #fff;
  flex-shrink: 0;
}

.logo-main { font-size: 14px; font-weight: 700; color: #fff; }
.logo-sub  { font-size: 11px; color: rgba(255,255,255,.5); }

.sidebar-nav {
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 14px;
  background: none;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,.6);
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
}
.nav-item:hover  { background: rgba(255,255,255,.08); color: #fff; }
.nav-item.active { background: rgba(59,130,246,.25); color: var(--primary-l); }
.nav-item i      { width: 18px; font-size: 15px; }

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid rgba(255,255,255,.1);
}

.admin-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 8px;
  background: rgba(255,255,255,.06);
  margin-bottom: 10px;
}
.admin-user img {
  width: 34px; height: 34px;
  border-radius: 50%;
  object-fit: cover;
}
.admin-user p     { font-size: 13px; font-weight: 600; color: #fff; }
.admin-user small { font-size: 11px; color: rgba(255,255,255,.5); word-break: break-all; }

.sidebar-actions { display: flex; flex-direction: column; gap: 2px; }

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  background: none;
  border: none;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,.5);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
  text-align: left;
}
.sidebar-link:hover   { background: rgba(255,255,255,.08); color: #fff; }
.sidebar-link.sign-out:hover { color: #fca5a5; }

/* ─── Main ─── */
.admin-main {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.admin-header {
  height: var(--header-h);
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 30;
}

.header-left { display: flex; align-items: center; gap: 14px; }
.header-left h1 { font-size: 20px; font-weight: 800; color: var(--text); }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text);
  cursor: pointer;
  padding: 6px;
}

.header-right { display: flex; gap: 10px; }

.stat-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: #eff6ff;
  color: var(--primary);
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
}
.stat-chip.green { background: #ecfdf5; color: var(--green); border-color: #a7f3d0; }

/* ─── Tabs ─── */
.tab-content {
  display: none;
  padding: 28px;
  flex: 1;
}
.tab-content.active { display: block; }

/* ─── Content bar ─── */
.content-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  min-width: 200px;
  max-width: 360px;
  padding: 10px 14px;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 9px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  transition: var(--transition);
}
.search-input:focus { outline: none; border-color: var(--primary-l); box-shadow: 0 0 0 3px rgba(59,130,246,.1); }

.btn-refresh {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 9px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text2);
  cursor: pointer;
  transition: var(--transition);
}
.btn-refresh:hover { border-color: var(--primary-l); color: var(--primary); }

/* ─── Table ─── */
.table-wrap {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table thead {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.data-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  white-space: nowrap;
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text2);
  vertical-align: middle;
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover    { background: var(--bg); }

.loading-row {
  text-align: center;
  padding: 40px;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.email-cell {
  font-size: 13px;
  color: var(--muted);
  word-break: break-all;
}

.student-info {
  display: flex;
  align-items: center;
  gap: 10px;
}
.student-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  object-fit: cover;
}
.student-avatar-placeholder {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--muted);
}

.badge-paid {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  background: #d1fae5;
  color: #065f46;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}
.badge-unpaid {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  background: #fef3c7;
  color: #92400e;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.btn-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: none;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-toggle.grant  { background: #d1fae5; color: #065f46; }
.btn-toggle.grant:hover { background: #a7f3d0; }
.btn-toggle.revoke { background: #fee2e2; color: #991b1b; }
.btn-toggle.revoke:hover { background: #fecaca; }
.btn-toggle:disabled { opacity: .5; cursor: wait; }

/* ─── Papers admin grid ─── */
.papers-admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.admin-paper-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  transition: var(--transition);
}
.admin-paper-card:hover { box-shadow: 0 4px 20px rgba(0,0,0,.08); }

.admin-paper-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.paper-type-badge {
  padding: 3px 9px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.paper-type-badge.final { background: linear-gradient(135deg,#7c3aed,#a78bfa); color: #fff; }
.paper-type-badge.past  { background: #dbeafe; color: var(--primary); }
.paper-type-badge.model { background: #d1fae5; color: var(--green); }
.paper-type-badge.mcq   { background: #fef3c7; color: #92400e; }
.paper-type-badge.essay { background: #ede9fe; color: #5b21b6; }

.btn-delete {
  width: 30px; height: 30px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
  transition: var(--transition);
}
.btn-delete:hover { background: #fee2e2; border-color: #fecaca; color: var(--red); }

.admin-paper-icon { font-size: 32px; color: #ef4444; margin-bottom: 8px; opacity: .8; }

.admin-paper-card h3 { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 5px; line-height: 1.4; }
.admin-paper-card p  { font-size: 12px; color: var(--muted); margin-bottom: 8px; }

.admin-paper-meta { font-size: 12px; color: var(--muted); margin-bottom: 12px; }
.admin-paper-meta i { color: var(--primary); margin-right: 4px; }

.btn-preview {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text2);
  text-decoration: none;
  transition: var(--transition);
}
.btn-preview:hover { border-color: var(--primary-l); color: var(--primary); }

/* ─── Add Paper Form ─── */
.form-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 640px;
}

.form-card h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.form-card h2 i { color: var(--red); }
.form-card > p { font-size: 14px; color: var(--muted); margin-bottom: 28px; }

.paper-form { display: flex; flex-direction: column; gap: 18px; }

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text2);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 11px 14px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 9px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  transition: var(--transition);
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-l);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(59,130,246,.1);
}

.form-hint {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}
.form-hint i { color: var(--primary-l); margin-right: 4px; }
.form-hint code {
  background: var(--bg);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 11px;
  color: var(--text2);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.btn-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-l));
  color: #fff;
  border: none;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(29,78,216,.3);
}
.btn-submit:hover    { opacity: .92; transform: translateY(-1px); }
.btn-submit:disabled { opacity: .6; cursor: wait; }

.form-msg {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  display: none;
}
.form-msg.success   { display: block; background: #d1fae5; color: #065f46; }
.form-msg.error-msg { display: block; background: #fee2e2; color: #991b1b; }

/* ─── Spinners ─── */
.spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}

.spinner-sm {
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Free/Paid badges ─── */
.free-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  background: #d1fae5;
  color: #065f46;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
}
.paid-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  background: #fef3c7;
  color: #92400e;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
}

/* ─── Access Toggle ─── */
.access-toggle-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.access-option input[type="radio"] { display: none; }

.access-option-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 12px;
  border: 2px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  background: var(--bg);
}
.access-option-card i      { font-size: 22px; }
.access-option-card strong { font-size: 13px; font-weight: 700; color: var(--text); }
.access-option-card span   { font-size: 11px; color: var(--muted); line-height: 1.4; }

.paid-option input:checked ~ .access-option-card {
  border-color: var(--amber);
  background: #fffbeb;
}
.paid-option .access-option-card i { color: var(--amber); }

.free-option input:checked ~ .access-option-card {
  border-color: var(--green);
  background: #ecfdf5;
}
.free-option .access-option-card i { color: var(--green); }

/* ─── Access Tab ─── */
.access-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.access-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 20px;
}

.access-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 9px;
  margin-bottom: 8px;
  gap: 12px;
}

.access-email {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
}

@media (max-width: 900px) {
  .access-grid { grid-template-columns: 1fr; }
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .admin-main {
    margin-left: 0;
  }
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .form-row { grid-template-columns: 1fr; }
  .tab-content { padding: 16px; }
  .admin-header { padding: 0 16px; }
  .header-right { display: none; }
}