:root {
  --primary: #2481cc;
  --primary-hover: #1a6baa;
  --danger: #e53935;
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1a1a2e;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --gold: #C9A84C;
  --radius: 10px;
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* === LOGIN === */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
  background: var(--card);
  border-radius: 16px;
  padding: 40px;
  width: 360px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.login-logo { font-size: 48px; margin-bottom: 12px; }
.login-box h1 { font-size: 22px; margin-bottom: 4px; }
.login-sub { color: var(--text-light); margin-bottom: 24px; font-size: 14px; }

.login-box input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  margin-bottom: 12px;
  outline: none;
  transition: border-color 0.2s;
}

.login-box input:focus { border-color: var(--primary); }

.login-box button {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.login-box button:hover { background: var(--primary-hover); }

.error { color: var(--danger); font-size: 13px; margin-top: 8px; }

/* === HEADER === */
.app-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 24px; }
.app-title { font-size: 16px; font-weight: 600; }

.header-right { display: flex; align-items: center; gap: 12px; }

.user-badge {
  background: var(--primary);
  color: #fff;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
}

.btn-ghost {
  background: none;
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  color: var(--text-light);
}

.btn-ghost:hover { background: var(--bg); }

/* === AI BAR === */
.ai-bar {
  padding: 12px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 10px;
}

.ai-bar input {
  flex: 1;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  outline: none;
}

.ai-bar input:focus { border-color: var(--primary); }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.ai-status {
  padding: 8px 24px;
  font-size: 13px;
  color: var(--primary);
  background: #e8f4fd;
}

/* === MAIN CONTENT === */
.main-content {
  display: flex;
  padding: 16px 24px;
  gap: 20px;
  height: calc(100vh - 120px);
}

.calendar-wrap {
  flex: 1;
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  overflow: auto;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

/* FullCalendar tweaks */
.fc { font-family: 'Inter', sans-serif; }
.fc .fc-toolbar-title { font-size: 18px !important; font-weight: 600; }
.fc .fc-button { border-radius: 6px !important; font-size: 13px !important; }
.fc .fc-button-primary {
  background: var(--primary) !important;
  border-color: var(--primary) !important;
}
.fc .fc-event {
  border-radius: 4px !important;
  font-size: 12px !important;
  padding: 2px 4px !important;
  cursor: pointer;
}
.fc .fc-daygrid-day.fc-day-today { background: #e8f4fd !important; }
.fc .fc-timegrid-now-indicator-line { border-color: var(--danger) !important; }

/* === SIDEBAR === */
.sidebar {
  width: 320px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  overflow-y: auto;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.sidebar-header h2 { font-size: 16px; }

.btn-small {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
}

/* Task items */
.task-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 6px;
  background: var(--bg);
  transition: background 0.15s;
}

.task-item:hover { background: #e8ecf1; }

.task-checkbox {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all 0.2s;
}

.task-checkbox.done {
  background: var(--primary);
  border-color: var(--primary);
}

.task-info { flex: 1; }
.task-info-title { font-size: 14px; font-weight: 500; }
.task-info-title.done { text-decoration: line-through; color: var(--text-light); }
.task-meta { font-size: 11px; color: var(--text-light); margin-top: 2px; }

.task-priority {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 6px;
}
.p-low { background: #4FC3F7; }
.p-medium { background: #FFD54F; }
.p-high { background: #FF9800; }
.p-urgent { background: #EF5350; }

.task-delete {
  background: none; border: none;
  color: var(--text-light); cursor: pointer;
  font-size: 16px; padding: 0 4px;
  opacity: 0; transition: opacity 0.15s;
}
.task-item:hover .task-delete { opacity: 1; }

.tasks-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-light);
  font-size: 14px;
}

/* === MODAL === */
.modal {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--card);
  border-radius: 12px;
  padding: 24px;
  width: 440px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.modal-header h3 { font-size: 18px; }

.modal-close {
  background: none; border: none;
  font-size: 24px; cursor: pointer;
  color: var(--text-light);
}

.form-group { margin-bottom: 12px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus { border-color: var(--primary); }

.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

.form-actions { display: flex; gap: 10px; margin-top: 16px; }

.btn-danger {
  background: var(--danger);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .main-content {
    flex-direction: column;
    height: auto;
  }
  .sidebar { width: 100%; }
  .calendar-wrap { min-height: 400px; }
  .ai-bar { flex-direction: column; }
}