@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --glass: rgba(255,255,255,0.06);
  --glass-border: rgba(255,255,255,0.08);
  --text-primary: #f0f0f5;
  --text-secondary: #8a8a9a;
  --text-muted: #5a5a6a;
  --accent: #6c5ce7;
  --accent-light: #a29bfe;
  --accent-glow: rgba(108,92,231,0.3);
  --success: #00cec9;
  --success-glow: rgba(0,206,201,0.25);
  --warning: #fdcb6e;
  --danger: #ff6b6b;
  --danger-glow: rgba(255,107,107,0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 8px 32px rgba(0,0,0,0.3);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

body {
  font-family:'Plus Jakarta Sans',system-ui,sans-serif;
  background:var(--bg-primary);
  color:var(--text-primary);
  min-height:100vh;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

/* Scrollbar */
::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--glass-border); border-radius:3px; }

/* Layout */
.app-container { max-width:480px; margin:0 auto; padding:0 16px 100px; }
@media(min-width:768px) { .app-container { max-width:520px; padding:0 24px 40px; } }

/* Header */
.app-header {
  text-align:center;
  padding:32px 0 24px;
  position:relative;
}
.app-header::after {
  content:'';
  position:absolute;
  bottom:0;left:50%;transform:translateX(-50%);
  width:60px;height:3px;
  background:linear-gradient(90deg,var(--accent),var(--accent-light));
  border-radius:2px;
}
.app-logo {
  font-size:28px;font-weight:800;
  background:linear-gradient(135deg,var(--accent-light),var(--accent),#fd79a8);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  letter-spacing:-0.5px;
}
.app-subtitle { font-size:13px;color:var(--text-muted);margin-top:6px;font-weight:400; }

/* Navigation Tabs */
.nav-tabs {
  display:flex;gap:4px;
  background:var(--bg-card);
  border-radius:var(--radius-sm);
  padding:4px;
  margin:20px 0;
  border:1px solid var(--glass-border);
}
.nav-tab {
  flex:1;padding:10px 8px;
  text-align:center;font-size:12px;font-weight:600;
  color:var(--text-secondary);
  border:none;background:none;
  border-radius:var(--radius-xs);
  cursor:pointer;transition:var(--transition);
  letter-spacing:0.3px;
}
.nav-tab.active {
  background:var(--accent);
  color:#fff;
  box-shadow:0 4px 15px var(--accent-glow);
}
.nav-tab:hover:not(.active) { color:var(--text-primary);background:var(--bg-card-hover); }

/* Tab Content */
.tab-content { display:none;animation:fadeIn .3s ease; }
.tab-content.active { display:block; }
@keyframes fadeIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:translateY(0)} }

/* Cards */
.card {
  background:var(--bg-card);
  border:1px solid var(--glass-border);
  border-radius:var(--radius);
  padding:20px;
  margin-bottom:12px;
  transition:var(--transition);
  backdrop-filter:blur(10px);
}
.card:hover { background:var(--bg-card-hover);border-color:rgba(255,255,255,0.12); }

.card-title {
  font-size:14px;font-weight:700;
  margin-bottom:16px;
  display:flex;align-items:center;gap:8px;
  color:var(--text-primary);
}
.card-title .icon { font-size:18px; }

/* Stats Grid */
.stats-grid { display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:16px; }
.stat-card {
  background:var(--bg-card);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  padding:16px;
  text-align:center;
  transition:var(--transition);
}
.stat-card:hover { transform:translateY(-2px);box-shadow:var(--shadow); }
.stat-value {
  font-size:22px;font-weight:800;
  background:linear-gradient(135deg,var(--accent-light),var(--success));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.stat-label { font-size:11px;color:var(--text-muted);margin-top:4px;font-weight:500;text-transform:uppercase;letter-spacing:0.5px; }

/* Member List */
.member-item {
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;
  background:var(--bg-card);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  margin-bottom:8px;
  cursor:pointer;
  transition:var(--transition);
}
.member-item:hover { background:var(--bg-card-hover);transform:translateX(4px); }
.member-item.selected { border-color:var(--accent);background:rgba(108,92,231,0.1); }

.member-avatar {
  width:36px;height:36px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent-light));
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:700;color:#fff;
  flex-shrink:0;
}
.member-info { flex:1;margin-left:12px; }
.member-name { font-size:14px;font-weight:600; }
.member-status {
  font-size:11px;margin-top:2px;
  display:flex;align-items:center;gap:4px;
}
.member-status .dot {
  width:6px;height:6px;border-radius:50%;
}
.dot.paid { background:var(--success);box-shadow:0 0 8px var(--success-glow); }
.dot.unpaid { background:var(--danger);box-shadow:0 0 8px var(--danger-glow); }

/* Payment Form */
.form-group { margin-bottom:16px; }
.form-label { font-size:12px;font-weight:600;color:var(--text-secondary);margin-bottom:6px;display:block;text-transform:uppercase;letter-spacing:0.5px; }
.form-input {
  width:100%;padding:14px 16px;
  background:var(--bg-card);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  color:var(--text-primary);
  font-size:16px;font-family:inherit;
  transition:var(--transition);
  outline:none;
}
.form-input:focus { border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow); }
.form-input::placeholder { color:var(--text-muted); }
.form-hint { font-size:11px;color:var(--text-muted);margin-top:4px; }
.form-hint.error { color:var(--danger); }

.selected-member-display {
  padding:12px 16px;
  background:rgba(108,92,231,0.08);
  border:1px solid rgba(108,92,231,0.2);
  border-radius:var(--radius-sm);
  font-size:13px;font-weight:500;
  display:flex;align-items:center;gap:8px;
  margin-bottom:16px;
}

/* Buttons */
.btn {
  width:100%;padding:14px;
  border:none;border-radius:var(--radius-sm);
  font-size:14px;font-weight:700;font-family:inherit;
  cursor:pointer;transition:var(--transition);
  display:flex;align-items:center;justify-content:center;gap:8px;
  letter-spacing:0.3px;
}
.btn:active { transform:scale(0.98); }
.btn-primary {
  background:linear-gradient(135deg,var(--accent),#7c6cf0);
  color:#fff;
  box-shadow:0 4px 20px var(--accent-glow);
}
.btn-primary:hover { box-shadow:0 6px 30px rgba(108,92,231,0.5);transform:translateY(-1px); }
.btn-primary:disabled { opacity:0.4;cursor:not-allowed;transform:none; }
.btn-danger {
  background:linear-gradient(135deg,var(--danger),#ee5a5a);
  color:#fff;
  box-shadow:0 4px 20px var(--danger-glow);
}
.btn-ghost {
  background:var(--bg-card);color:var(--text-secondary);
  border:1px solid var(--glass-border);
}
.btn-ghost:hover { background:var(--bg-card-hover);color:var(--text-primary); }
.btn-sm { padding:8px 16px;font-size:12px;width:auto; }

/* Payment History */
.payment-item {
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;
  border-bottom:1px solid var(--glass-border);
}
.payment-item:last-child { border-bottom:none; }
.payment-amount { font-size:15px;font-weight:700;color:var(--success); }
.payment-date { font-size:11px;color:var(--text-muted); }
.payment-status {
  font-size:10px;font-weight:700;
  padding:4px 10px;border-radius:20px;
  text-transform:uppercase;letter-spacing:0.5px;
}
.payment-status.completed { background:rgba(0,206,201,0.15);color:var(--success); }
.payment-status.pending { background:rgba(253,203,110,0.15);color:var(--warning); }

/* Modal */
.modal-overlay {
  position:fixed;inset:0;
  background:rgba(0,0,0,0.7);
  backdrop-filter:blur(8px);
  display:flex;align-items:flex-end;justify-content:center;
  z-index:100;
  animation:fadeIn .2s ease;
}
@media(min-width:768px) { .modal-overlay { align-items:center; } }

.modal {
  background:var(--bg-secondary);
  border:1px solid var(--glass-border);
  border-radius:var(--radius) var(--radius) 0 0;
  padding:24px;
  width:100%;max-width:480px;
  max-height:85vh;overflow-y:auto;
  animation:slideUp .3s ease;
}
@media(min-width:768px) { .modal { border-radius:var(--radius); } }
@keyframes slideUp { from{transform:translateY(100%)} to{transform:translateY(0)} }

.modal-header {
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:20px;
}
.modal-title { font-size:18px;font-weight:700; }
.modal-close {
  width:32px;height:32px;
  border-radius:50%;background:var(--bg-card);
  border:1px solid var(--glass-border);
  color:var(--text-secondary);font-size:18px;
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:var(--transition);
}
.modal-close:hover { background:var(--danger);color:#fff;border-color:var(--danger); }

/* Toast */
.toast-container { position:fixed;top:20px;right:20px;z-index:200;display:flex;flex-direction:column;gap:8px; }
.toast {
  padding:12px 20px;
  border-radius:var(--radius-sm);
  font-size:13px;font-weight:500;
  animation:slideIn .3s ease;
  max-width:320px;
  box-shadow:var(--shadow);
}
@keyframes slideIn { from{transform:translateX(100%);opacity:0} to{transform:translateX(0);opacity:1} }
.toast.success { background:rgba(0,206,201,0.9);color:#fff; }
.toast.error { background:rgba(255,107,107,0.9);color:#fff; }
.toast.info { background:rgba(108,92,231,0.9);color:#fff; }

/* Empty state */
.empty-state {
  text-align:center;padding:40px 20px;
  color:var(--text-muted);
}
.empty-state .icon { font-size:48px;margin-bottom:12px; }
.empty-state p { font-size:13px; }

/* Loading */
.spinner {
  width:24px;height:24px;
  border:3px solid var(--glass-border);
  border-top-color:var(--accent);
  border-radius:50%;
  animation:spin .6s linear infinite;
  margin:20px auto;
}
@keyframes spin { to{transform:rotate(360deg)} }

/* Admin specific */
.admin-member-item {
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;
  background:var(--bg-card);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  margin-bottom:8px;
}
.admin-actions { display:flex;gap:6px; }
.admin-actions button {
  padding:6px 10px;
  border:none;border-radius:var(--radius-xs);
  font-size:12px;cursor:pointer;
  transition:var(--transition);
  font-family:inherit;font-weight:600;
}
.btn-edit { background:rgba(108,92,231,0.15);color:var(--accent-light); }
.btn-edit:hover { background:rgba(108,92,231,0.3); }
.btn-delete { background:rgba(255,107,107,0.15);color:var(--danger); }
.btn-delete:hover { background:rgba(255,107,107,0.3); }

/* Search */
.search-box {
  position:relative;margin-bottom:16px;
}
.search-box input {
  width:100%;padding:12px 16px 12px 40px;
  background:var(--bg-card);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  color:var(--text-primary);
  font-size:14px;font-family:inherit;
  outline:none;transition:var(--transition);
}
.search-box input:focus { border-color:var(--accent); }
.search-box .search-icon {
  position:absolute;left:14px;top:50%;transform:translateY(-50%);
  color:var(--text-muted);font-size:14px;
}

/* Admin login */
.login-container {
  display:flex;align-items:center;justify-content:center;
  min-height:80vh;
}
.login-card {
  width:100%;max-width:360px;
  background:var(--bg-card);
  border:1px solid var(--glass-border);
  border-radius:var(--radius);
  padding:32px 24px;
  backdrop-filter:blur(10px);
}
.login-title {
  font-size:22px;font-weight:800;text-align:center;margin-bottom:24px;
  background:linear-gradient(135deg,var(--accent-light),var(--accent));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}

/* Bottom Nav (mobile) */
.bottom-nav {
  position:fixed;bottom:0;left:0;right:0;
  background:rgba(10,10,15,0.95);
  backdrop-filter:blur(20px);
  border-top:1px solid var(--glass-border);
  display:flex;
  padding:8px 0 env(safe-area-inset-bottom,8px);
  z-index:50;
}
@media(min-width:768px) { .bottom-nav { display:none; } }
.bottom-nav-item {
  flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:8px 4px;
  background:none;border:none;
  color:var(--text-muted);font-size:10px;font-weight:600;font-family:inherit;
  cursor:pointer;transition:var(--transition);
}
.bottom-nav-item.active { color:var(--accent-light); }
.bottom-nav-item .nav-icon { font-size:20px; }

/* Hide sections */
.hidden { display:none!important; }

/* Responsive */
@media(max-width:374px) {
  .app-logo { font-size:22px; }
  .stat-value { font-size:18px; }
}