/* === Theme Variables === */
:root {
  --bg: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  --bg-solid: #0f0c29;
  --glass: rgba(255,255,255,0.05);
  --glass-hover: rgba(255,255,255,0.08);
  --glass-border: rgba(255,255,255,0.08);
  --glass-border-hover: rgba(255,255,255,0.15);
  --blur: blur(16px);
  --text: #e8e8f0;
  --text-muted: rgba(255,255,255,0.4);
  --primary: #7c8aff;
  --primary-hover: #6b79f0;
  --primary-glow: rgba(124,138,255,0.25);
  --green: #6ee7b7;
  --orange: #fbbf24;
  --red: #f87171;
  --blue: #60a5fa;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.2);
}

/* Light theme */
[data-theme="light"] {
  --bg: linear-gradient(135deg, #e8eaf6, #f5f5f5, #e3e7f1);
  --bg-solid: #eef0f7;
  --glass: rgba(255,255,255,0.6);
  --glass-hover: rgba(255,255,255,0.75);
  --glass-border: rgba(0,0,0,0.08);
  --glass-border-hover: rgba(0,0,0,0.15);
  --blur: blur(16px);
  --text: #1a1a2e;
  --text-muted: rgba(0,0,0,0.45);
  --primary: #4f5bd5;
  --primary-hover: #4350c0;
  --primary-glow: rgba(79,91,213,0.2);
  --green: #16a34a;
  --orange: #d97706;
  --red: #dc2626;
  --blue: #2563eb;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; }

/* === Screens === */
.screen { display: none !important; }
.screen.active { display: block !important; }
.hidden { display: none !important; }

/* === Login === */
.login-container {
  max-width: 380px;
  margin: 15vh auto 0;
  padding: 2rem;
}
.login-logo {
  text-align: center;
  margin-bottom: 2rem;
}
.login-logo h1 {
  font-size: 1.8rem;
  color: var(--primary);
  text-shadow: 0 0 30px var(--primary-glow);
}
.login-logo p {
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* === Forms === */
.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.8rem;
  background: var(--bg-solid);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.form-group select option {
  background: var(--bg-solid);
  color: var(--text);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 20px var(--primary-glow);
}
.form-group textarea { resize: vertical; min-height: 60px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: rgba(124,138,255,0.3);
  border: 1px solid rgba(124,138,255,0.4);
  color: var(--primary);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.btn-primary:hover {
  background: rgba(124,138,255,0.45);
  box-shadow: 0 0 20px var(--primary-glow);
}
[data-theme="light"] .btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
[data-theme="light"] .btn-primary:hover { background: var(--primary-hover); }
.btn-danger {
  background: rgba(248,113,113,0.2);
  border: 1px solid rgba(248,113,113,0.3);
  color: var(--red);
}
.btn-danger:hover { background: rgba(248,113,113,0.35); }
.btn-success {
  background: rgba(110,231,183,0.2);
  border: 1px solid rgba(110,231,183,0.3);
  color: var(--green);
}
.btn-success:hover { background: rgba(110,231,183,0.35); }
.btn-outline {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.btn-outline:hover { border-color: var(--glass-border-hover); color: var(--text); }
.btn-small { padding: 0.35rem 0.7rem; font-size: 0.8rem; }
.btn-full { width: 100%; }
.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}
.btn-close:hover { color: var(--text); }

/* === Theme Toggle === */
.theme-toggle {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s;
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.theme-toggle:hover { border-color: var(--glass-border-hover); color: var(--text); }

/* === Header === */
#app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1rem;
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
#page-title { font-size: 1.1rem; font-weight: 600; }
.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}
#user-name { color: var(--text-muted); }
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
}
.badge-admin { background: rgba(248,113,113,0.2); border: 1px solid rgba(248,113,113,0.3); color: var(--red); }
.badge-member { background: rgba(124,138,255,0.2); border: 1px solid rgba(124,138,255,0.3); color: var(--primary); }
.badge-reader { background: var(--glass); border: 1px solid var(--glass-border); color: var(--text-muted); }

/* === Navigation === */
#app-nav {
  display: flex;
  justify-content: space-around;
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-top: 1px solid var(--glass-border);
  padding: 0.4rem 0;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
}
.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius);
  transition: all 0.3s;
}
.nav-btn .nav-icon { font-size: 1.2rem; }
.nav-btn.active {
  color: var(--primary);
  background: var(--primary-glow);
}
.nav-btn:hover { color: var(--text); }

/* === Main === */
#app-main { padding: 1rem; padding-bottom: 5rem; }
.page { display: none; }
.page.active { display: block; }

/* === Cards === */
.card {
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
  transition: border-color 0.3s;
}
.card:hover { border-color: var(--glass-border-hover); }
.card h3 {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.card-body { font-size: 0.9rem; }

/* === Dashboard Grid === */
.dashboard-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 768px) {
  .dashboard-grid { grid-template-columns: 1fr 1fr; }
}

/* === Page Header === */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.page-header h3 { font-size: 1.1rem; }

/* === Filters === */
.filters { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.filters select {
  padding: 0.4rem 0.6rem;
  background: var(--bg-solid);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.85rem;
}
.filters select option {
  background: var(--bg-solid);
  color: var(--text);
}

/* === Lists === */
.list { display: flex; flex-direction: column; gap: 0.5rem; }
.list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1rem;
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.3s;
}
.list-item:hover {
  border-color: var(--glass-border-hover);
  background: var(--glass-hover);
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.list-item-left { flex: 1; }
.list-item-title { font-weight: 500; margin-bottom: 0.2rem; }
.list-item-sub { font-size: 0.8rem; color: var(--text-muted); }
.list-item-right { text-align: right; }
.list-empty { text-align: center; padding: 2rem; color: var(--text-muted); }

/* === Status badges === */
.status {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
}
.status-confirmed { background: rgba(96,165,250,0.15); border: 1px solid rgba(96,165,250,0.25); color: var(--blue); }
.status-paid, .status-done { background: rgba(110,231,183,0.15); border: 1px solid rgba(110,231,183,0.25); color: var(--green); }
.status-pending, .status-in_progress, .status-todo { background: rgba(251,191,36,0.15); border: 1px solid rgba(251,191,36,0.25); color: var(--orange); }
.status-cancelled, .status-overdue { background: rgba(248,113,113,0.15); border: 1px solid rgba(248,113,113,0.25); color: var(--red); }

/* === Calendar === */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}
.calendar-header h3 { font-size: 1.1rem; text-transform: capitalize; }
.calendar-legend { display: flex; gap: 1rem; margin-bottom: 0.8rem; font-size: 0.8rem; flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 0.3rem; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot-green { background: var(--green); }
.dot-orange { background: var(--orange); }
.dot-red { background: var(--red); }
.dot-blue { background: var(--blue); }

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
  max-width: 900px;
}
.cal-day-header {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 0.4rem;
  font-weight: 600;
}
.cal-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  cursor: pointer;
  position: relative;
  transition: all 0.3s;
  min-height: 42px;
}
.cal-day:hover {
  background: var(--glass-hover);
  border-color: var(--glass-border-hover);
}
.cal-day.empty { background: transparent; border-color: transparent; cursor: default; }
.cal-day.today {
  border: 2px solid var(--primary);
  box-shadow: 0 0 15px var(--primary-glow);
}
.cal-day .cal-dots { display: flex; gap: 2px; margin-top: 2px; }
.cal-day .cal-dot { width: 6px; height: 6px; border-radius: 50%; }

/* === Payment totals === */
.payment-totals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.8rem;
  margin-bottom: 1rem;
}
.total-card {
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 0.8rem;
  text-align: center;
}
.total-card .total-amount { font-size: 1.3rem; font-weight: 700; }
.total-card .total-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.2rem; }

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}
.modal {
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
}
[data-theme="light"] .modal {
  background: rgba(255,255,255,0.85);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  border-bottom: 1px solid var(--glass-border);
}
.modal-header h3 { font-size: 1rem; }
.modal-body { padding: 1rem; }

/* === Toast === */
.toast {
  position: fixed;
  bottom: 5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  z-index: 2000;
  box-shadow: var(--shadow);
  transition: opacity 0.3s;
}
.toast.toast-success { border-color: var(--green); }
.toast.toast-error { border-color: var(--red); }

/* === Password masking === */
.password-field { -webkit-text-security: disc; text-security: disc; }

/* === Error === */
.error-msg { color: var(--red); font-size: 0.85rem; margin-top: 0.5rem; text-align: center; }

/* === Responsive === */
@media (min-width: 768px) {
  #app-nav {
    position: static;
    justify-content: flex-start;
    gap: 0.3rem;
    padding: 0.4rem 1rem;
  }
  #app-main { padding-bottom: 2rem; }
  .cal-day { min-height: 50px; max-height: 70px; font-size: 0.9rem; aspect-ratio: auto; }
}

/* === Utility === */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.flex-between { display: flex; justify-content: space-between; align-items: center; }