/* Import Google Font */
body {
  font-family: 'Poppins', Arial, sans-serif;
  background: linear-gradient(135deg, #e0e7ff 0%, #f5f6fa 100%);
  color: var(--primary-text);
  margin: 0;
  min-height: 100vh;
  transition: background 0.4s, color 0.4s;
}
[data-theme="dark"] body {
  background: linear-gradient(135deg, #23272f 0%, #181a1b 100%);
}
:root {
  --primary-bg: #f5f6fa;
  --primary-text: #111;
  --card-bg: #fff;
  --accent: #4f8cff;
  --accent-gradient: linear-gradient(90deg, #4f8cff 0%, #6a82fb 100%);
  --income: #4caf50;
  --expense: #e74c3c;
  --shadow: 0 4px 24px rgba(79,140,255,0.10);
}
[data-theme="dark"] {
  --primary-bg: #181a1b;
  --primary-text: #111;
  --card-bg: #23272f;
  --accent: #4f8cff;
  --accent-gradient: linear-gradient(90deg, #4f8cff 0%, #23272f 100%);
  --shadow: 0 4px 24px rgba(79,140,255,0.15);
}

/* Header & Nav */
.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  padding: 0.7em 2em;
  position: sticky;
  top: 0;
  z-index: 10;
}
.logo-title {
  display: flex;
  align-items: center;
  gap: 0.7em;
}
.logo {
  width: 40px;
  height: 40px;
}
.title {
  font-size: 1.7em;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--accent);
}
.main-nav {
  display: flex;
  gap: 0.5em;
}
.nav-btn {
  background: none;
  border: none;
  color: var(--primary-text);
  font-size: 1em;
  padding: 0.5em 1.1em;
  border-radius: 20px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  font-weight: 500;
}
.nav-btn:hover, .nav-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: var(--shadow);
}

/* Footer */
.main-footer {
  background: var(--card-bg);
  color: #888;
  text-align: center;
  padding: 1.2em 0 0.7em 0;
  font-size: 1em;
  margin-top: 3em;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.04);
}

/* Centered Auth Card */
.centered-section {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 70vh;
}
.auth-card {
  background: var(--card-bg);
  box-shadow: var(--shadow);
  border-radius: 18px;
  padding: 2.5em 2em 2em 2em;
  min-width: 320px;
  max-width: 350px;
  margin: 2em auto;
  text-align: center;
  animation: fadeIn 0.7s;
}
.brand {
  color: var(--accent);
  font-weight: 600;
}

/* Input Groups & Floating Labels */
.input-group {
  position: relative;
  margin-bottom: 1.5em;
}
.input-group input,
.input-group select {
  width: 100%;
  padding: 1em 1em 1em 0.7em;
  border: 1.5px solid #d1d5db;
  border-radius: 10px;
  background: transparent;
  font-size: 1em;
  color: var(--primary-text);
  outline: none;
  transition: border 0.2s, box-shadow 0.2s;
}
.input-group input:focus,
.input-group select:focus {
  border: 1.5px solid var(--accent);
  box-shadow: 0 2px 8px rgba(79,140,255,0.10);
}
.input-group label {
  position: absolute;
  left: 0.9em;
  top: 1.1em;
  color: #888;
  font-size: 1em;
  pointer-events: none;
  background: var(--card-bg);
  padding: 0 0.2em;
  transition: 0.2s;
}
.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label,
.input-group select:focus + label,
.input-group select:not([value=""]) + label {
  top: -0.7em;
  left: 0.7em;
  font-size: 0.85em;
  color: var(--accent);
  background: var(--card-bg);
}

/* Buttons */
.primary-btn {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 0.8em 2.2em;
  font-size: 1.1em;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.5em;
  box-shadow: var(--shadow);
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.primary-btn:hover {
  background: linear-gradient(90deg, #6a82fb 0%, #4f8cff 100%);
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 8px 32px rgba(79,140,255,0.18);
}

/* Section Titles */
.section-title {
  text-align: center;
  font-size: 2em;
  font-weight: 600;
  margin: 1.2em 0 0.7em 0;
  color: var(--accent);
  letter-spacing: 1px;
}

/* Dashboard Cards */
.summary-cards {
  display: flex;
  gap: 2em;
  flex-wrap: wrap;
  justify-content: center;
  margin: 2em 0 1em 0;
}
.card {
  background: var(--card-bg);
  box-shadow: var(--shadow);
  border-radius: 18px;
  min-width: 200px;
  max-width: 260px;
  padding: 2em 1.5em 1.5em 1.5em;
  text-align: center;
  font-weight: 500;
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
  animation: fadeInUp 0.7s;
}
.card:hover {
  transform: translateY(-7px) scale(1.04);
  box-shadow: 0 12px 32px rgba(79,140,255,0.13);
}
.card-icon {
  margin-bottom: 0.5em;
}
.card-label {
  font-size: 1.1em;
  color: #888;
  margin-bottom: 0.2em;
}
.card-value {
  font-size: 2em;
  font-weight: 700;
  color: var(--primary-text);
  margin-top: 0.2em;
}
.income-card .card-value { color: var(--income); }
.expense-card .card-value { color: var(--expense); }
.balance-card .card-value { color: var(--accent); }

/* Transaction Form */
.transaction-form {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2em;
  justify-content: center;
  margin-bottom: 2em;
}
.transaction-form .input-group {
  flex: 1 1 180px;
  min-width: 160px;
  max-width: 220px;
}

/* Table */
.table-container {
  overflow-x: auto;
  margin: 0 auto 2em auto;
  max-width: 900px;
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1em 0.5em;
}
#transactions-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1em;
}
#transactions-table th, #transactions-table td {
  padding: 0.8em 1em;
  border-bottom: 1px solid #e0e7ff;
  text-align: center;
}
#transactions-table th {
  background: var(--primary-bg);
  color: var(--accent);
  font-weight: 600;
}
#transactions-table tr:nth-child(even) {
  background: #f3f6fd;
}
[data-theme="dark"] #transactions-table tr:nth-child(even) {
  background: #23272f;
}
#transactions-table tr:hover {
  background: #e0e7ff;
  transition: background 0.2s;
}
[data-theme="dark"] #transactions-table tr:hover {
  background: #23272f;
}
#transactions-table button {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 0.4em 1em;
  font-size: 0.95em;
  cursor: pointer;
  margin: 0 0.2em;
  transition: background 0.2s, transform 0.2s;
}
#transactions-table button:hover {
  background: linear-gradient(90deg, #6a82fb 0%, #4f8cff 100%);
  transform: scale(1.07);
}

/* Charts */
.charts-container {
  display: flex;
  gap: 2em;
  flex-wrap: wrap;
  justify-content: center;
  margin: 2em 0;
}
.chart-card {
  background: var(--card-bg);
  box-shadow: var(--shadow);
  border-radius: 18px;
  padding: 1.5em 2em;
  min-width: 320px;
  max-width: 420px;
  margin-bottom: 1em;
  text-align: center;
  animation: fadeIn 0.7s;
}

/* Toast Notification */
#toast {
  position: fixed;
  bottom: 2em;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #fff;
  padding: 1em 2em;
  border-radius: 8px;
  opacity: 0.97;
  z-index: 1000;
  font-size: 1.1em;
  box-shadow: 0 4px 24px rgba(79,140,255,0.18);
  transition: opacity 0.3s, bottom 0.3s, transform 0.3s;
  animation: slideInUp 0.5s;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInUp {
  from { opacity: 0; bottom: 0; }
  to { opacity: 1; bottom: 2em; }
}
.fade-section {
  animation: fadeIn 0.7s;
}
.animated-card {
  animation: fadeInUp 0.7s;
}

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

/* Responsive Design */
@media (max-width: 1100px) {
  .summary-cards { gap: 1em; }
  .charts-container { gap: 1em; }
}
@media (max-width: 800px) {
  .summary-cards, .charts-container {
    flex-direction: column;
    align-items: center;
  }
  .main-header, .main-footer {
    padding-left: 1em;
    padding-right: 1em;
  }
}
@media (max-width: 600px) {
  .auth-card, .chart-card, .card {
    min-width: 90vw;
    max-width: 98vw;
    padding: 1.2em 0.5em;
  }
  .main-header, .main-footer {
    flex-direction: column;
    gap: 0.5em;
    padding: 0.7em 0.5em;
  }
  .main-nav { flex-wrap: wrap; gap: 0.2em; }
}