:root {
  --primary: #6c5ce7;
  --primary-dark: #5849c2;
  --accent1: #00cec9;
  --accent2: #fd79a8;
  --accent3: #fdcb6e;
  --accent4: #55efc4;
  --accent5: #74b9ff;
  --danger: #e17055;
  --bg: #f4f2ff;
  --card-bg: #ffffff;
  --text-dark: #2d2d3a;
  --text-muted: #7a7a8c;
  --shadow: 0 8px 24px rgba(108, 92, 231, 0.12);
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #f4f2ff 0%, #e9f7ff 50%, #fff0f6 100%);
  min-height: 100vh;
  color: var(--text-dark);
}

.hidden { display: none !important; }

/* LOGIN */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 45%, #fd79a8 100%);
  padding: 20px;
}

.login-card {
  background: var(--card-bg);
  border-radius: 24px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  max-width: 400px;
  width: 100%;
}

.login-logo { font-size: 56px; margin-bottom: 8px; }

.login-card h1 {
  margin: 8px 0;
  font-weight: 800;
  font-size: 28px;
  background: linear-gradient(90deg, var(--primary), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.login-card p {
  color: var(--text-muted);
  margin-bottom: 28px;
}

.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 20px;
  border-radius: 12px;
  border: 2px solid #eee;
  background: #fff;
  font-family: inherit;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-dark);
}

.btn-google:hover {
  border-color: var(--primary);
  box-shadow: 0 6px 16px rgba(108,92,231,0.2);
  transform: translateY(-2px);
}

.btn-google img { width: 22px; height: 22px; }

.login-error {
  margin-top: 16px;
  color: var(--danger);
  font-size: 14px;
  font-weight: 500;
}

/* APP SHELL */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 22px;
}

.brand-emoji { font-size: 26px; }

.brand-title {
  background: linear-gradient(90deg, var(--primary), var(--accent2), var(--accent3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.user-box {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-photo {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  object-fit: cover;
}

.user-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-dark);
}

.btn-signout {
  background: var(--danger);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
  font-size: 13px;
  transition: transform 0.15s ease;
}

.btn-signout:hover { transform: translateY(-2px); }

.main-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.card h2 {
  margin-top: 0;
  font-size: 18px;
  font-weight: 700;
}

.add-expense-card { grid-column: 1 / -1; }

.form-row {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
}

.form-group { flex: 1; display: flex; flex-direction: column; gap: 6px; }

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

.form-group input, .form-group select {
  padding: 12px 14px;
  border-radius: 10px;
  border: 2px solid #ecebf9;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease;
  background: #fbfaff;
}

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

.btn-primary {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--primary), var(--accent2));
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(108,92,231,0.35);
}

.summary-row {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stat-card {
  border-radius: var(--radius);
  padding: 20px;
  color: #fff;
  box-shadow: var(--shadow);
}

.stat-today { background: linear-gradient(135deg, var(--accent5), #4b8ff0); }
.stat-week { background: linear-gradient(135deg, var(--accent4), #17b78f); }
.stat-month { background: linear-gradient(135deg, var(--accent3), #f0932b); }
.stat-total { background: linear-gradient(135deg, var(--accent2), var(--primary)); }

.stat-label {
  font-size: 13px;
  opacity: 0.9;
  font-weight: 600;
  margin-bottom: 6px;
}

.stat-value { font-size: 26px; font-weight: 800; }

.chart-card { min-height: 320px; }

.chart-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  padding: 8px 18px;
  border-radius: 10px;
  border: none;
  background: #ecebf9;
  color: var(--text-dark);
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s ease;
}

.tab-btn.active, .tab-btn:hover {
  background: linear-gradient(90deg, var(--primary), var(--accent2));
  color: #fff;
}

.chart-wrap { position: relative; height: 260px; }
.chart-wrap-small { height: 240px; }

.list-card { grid-column: 1 / -1; }

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

.list-header h2 { margin: 0; }

#search-input {
  padding: 10px 14px;
  border-radius: 10px;
  border: 2px solid #ecebf9;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  min-width: 220px;
}

#search-input:focus { border-color: var(--primary); }

.expense-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 400px;
  overflow-y: auto;
}

.expense-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-radius: 12px;
  background: #fbfaff;
  border: 1px solid #f0eefb;
  transition: transform 0.15s ease;
}

.expense-item:hover {
  transform: translateX(4px);
  border-color: var(--primary);
}

.expense-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.expense-cat-badge {
  font-size: 22px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ecebf9;
}

.expense-info { display: flex; flex-direction: column; }

.expense-note { font-weight: 600; font-size: 14px; }
.expense-meta { font-size: 12px; color: var(--text-muted); }

.expense-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.expense-amount { font-weight: 700; font-size: 15px; color: var(--primary-dark); }

.btn-delete {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 18px;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.15s ease;
}

.btn-delete:hover { background: #fdecea; }

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 30px 0;
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--text-dark);
  color: #fff;
  padding: 14px 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  transform: translateY(120%);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 100;
}

.toast.show { transform: translateY(0); opacity: 1; }

@media (max-width: 800px) {
  .main-grid { grid-template-columns: 1fr; }
  .summary-row { grid-template-columns: repeat(2, 1fr); }
  .form-row { flex-direction: column; }
  .list-header { flex-direction: column; align-items: stretch; }
}