:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #06b6d4;
  --background: #f1f5f9;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --radius: 18px;
}

[data-theme="dark"] {
  --background: #0f172a;
  --surface: #1e293b;
  --surface-soft: #172033;
  --text: #f8fafc;
  --muted: #94a3b8;
  --border: #334155;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  background: var(--background);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 0;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.login-screen {
  display: grid;
  min-height: 100vh;
  padding: 1rem;
  place-items: center;
  background:
    radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.22), transparent 30%),
    radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.18), transparent 30%),
    var(--background);
}

.login-card {
  width: min(100%, 440px);
  padding: 2.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  text-align: center;
}

.login-logo {
  display: grid;
  width: 64px;
  height: 64px;
  margin: 0 auto 1.4rem;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 20px;
  font-size: 2rem;
  font-weight: 900;
}

.eyebrow {
  margin-bottom: 0.35rem;
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.login-card h1 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.05em;
}

.login-text {
  margin-bottom: 1.8rem;
  color: var(--muted);
}

.login-card small {
  display: block;
  margin-top: 1.2rem;
  color: var(--muted);
  font-size: 0.75rem;
}

.google-button {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  transition: 0.2s ease;
}

.google-button:hover {
  border-color: var(--primary);
  box-shadow: 0 5px 16px rgba(37, 99, 235, 0.15);
  transform: translateY(-2px);
}

.google-icon {
  color: #4285f4;
  font-size: 1.25rem;
  font-weight: 900;
}

.auth-message {
  min-height: 1.2rem;
  margin-top: 1rem;
  color: var(--danger);
  font-size: 0.85rem;
}

.app {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  grid-template-rows: 86px minmax(0, 1fr);
  grid-template-areas:
    "sidebar topbar"
    "sidebar main";
  min-height: 100vh;
}

.sidebar {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  gap: 3rem;
  padding: 2rem 1.25rem;
  background: var(--surface);
  border-right: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 900;
  text-decoration: none;
  letter-spacing: -0.04em;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.nav-item {
  position: relative;
  padding: 0.85rem 1rem;
  color: var(--muted);
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  transition: 0.2s ease;
}

.nav-item:hover,
.nav-item.active {
  color: var(--primary);
  background: rgba(37, 99, 235, 0.1);
}

.nav-item.active::before {
  position: absolute;
  top: 50%;
  left: 0;
  width: 3px;
  height: 22px;
  content: "";
  background: var(--primary);
  border-radius: 0 5px 5px 0;
  transform: translateY(-50%);
}

.sidebar-tip {
  display: flex;
  gap: 0.6rem;
  margin-top: auto;
  padding: 1rem;
  color: var(--muted);
  background: var(--surface-soft);
  border-radius: 14px;
  font-size: 0.8rem;
}

.logout-button {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 1rem;
  color: var(--danger);
  background: transparent;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  text-align: left;
}

.logout-button:hover {
  background: rgba(220, 38, 38, 0.1);
}

.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 3rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: 1.5rem;
  letter-spacing: -0.04em;
}

.user-area {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.user-details {
  display: flex;
  flex-direction: column;
  text-align: right;
}

.user-details strong {
  font-size: 0.9rem;
}

.user-details small {
  color: var(--muted);
  font-size: 0.72rem;
}

.user-photo {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
}

.icon-button {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: var(--muted);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.1rem;
}

.icon-button:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.main-content {
  grid-area: main;
  width: 100%;
  max-width: 1500px;
  padding: 2.5rem 3rem;
}

.hero-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 150px;
  margin-bottom: 2rem;
  padding: 2rem;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(120deg, #1d4ed8, #2563eb 55%, #0891b2);
  border-radius: 22px;
}

.hero-section .eyebrow {
  color: #bfdbfe;
}

.hero-section h2 {
  margin-bottom: 0.4rem;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  letter-spacing: -0.05em;
}

.hero-section p:last-child {
  color: #dbeafe;
  font-size: 0.9rem;
}

.hero-decoration {
  display: flex;
  gap: 0.7rem;
  align-items: end;
  font-size: 2.4rem;
  transform: rotate(-5deg);
}

.hero-decoration span:nth-child(2) {
  margin-bottom: 1.5rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.summary-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.summary-icon {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border-radius: 13px;
  font-size: 1.2rem;
  font-weight: 900;
}

.income-card .summary-icon {
  color: #15803d;
  background: #dcfce7;
}

.expense-card .summary-icon {
  color: #b45309;
  background: #fef3c7;
}

.balance-card .summary-icon {
  color: #1d4ed8;
  background: #dbeafe;
}

.summary-card p {
  margin-bottom: 0.15rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.summary-card h2 {
  font-size: 1.35rem;
  letter-spacing: -0.04em;
}

.panel {
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel-heading,
.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.4rem;
}

.panel-heading h2,
.section-heading h2 {
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}

.badge {
  padding: 0.35rem 0.7rem;
  color: var(--primary);
  background: rgba(37, 99, 235, 0.1);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
}

.forms-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.form-group h3 {
  margin-bottom: 0.2rem;
  font-size: 0.95rem;
}

.helper-text {
  margin-bottom: 0.9rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.form-row {
  display: flex;
  gap: 0.65rem;
  align-items: center;
}

.form-row input,
.theme-select {
  width: 100%;
  min-width: 0;
  padding: 0.75rem 0.85rem;
  color: var(--text);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 9px;
  outline: none;
}

.form-row input:focus,
.theme-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

.primary-button,
.secondary-button {
  flex-shrink: 0;
  padding: 0.75rem 1rem;
  border-radius: 9px;
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 800;
  transition: 0.2s ease;
}

.primary-button {
  color: #fff;
  background: var(--primary);
}

.primary-button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.secondary-button {
  color: var(--primary);
  background: rgba(37, 99, 235, 0.1);
}

.secondary-button:hover {
  background: rgba(37, 99, 235, 0.2);
}

.status-banner {
  margin-top: 1.5rem;
  padding: 0.85rem 1rem;
  border-radius: 9px;
  font-size: 0.85rem;
  font-weight: 700;
}

.status-banner.info {
  color: #0369a1;
  background: #e0f2fe;
}

.status-banner.success {
  color: #15803d;
  background: #dcfce7;
}

.status-banner.danger {
  color: #b91c1c;
  background: #fee2e2;
}

.expenses-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
}

.expense-item {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: 0.2s ease;
}

.expense-item:hover {
  border-color: #93c5fd;
  transform: translateY(-3px);
}

.expense-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.expense-name {
  overflow: hidden;
  font-size: 0.96rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.expense-icon {
  display: grid;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  place-items: center;
  background: var(--surface-soft);
  border-radius: 10px;
}

.expense-amount {
  font-size: 1.45rem;
  font-weight: 900;
}

.expense-date {
  color: var(--muted);
  font-size: 0.75rem;
}

.remove-button {
  align-self: flex-start;
  margin-top: auto;
  padding: 0.45rem 0.75rem;
  color: var(--danger);
  background: rgba(220, 38, 38, 0.1);
  border-radius: 7px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 800;
}

.remove-button:hover {
  color: #fff;
  background: var(--danger);
}

.empty-state {
  grid-column: 1 / -1;
  padding: 3rem 1rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  text-align: center;
}

.empty-icon {
  display: grid;
  width: 44px;
  height: 44px;
  margin: 0 auto 0.8rem;
  place-items: center;
  color: var(--primary);
  background: rgba(37, 99, 235, 0.1);
  border-radius: 50%;
  font-size: 1.5rem;
}

.empty-state h3 {
  margin-bottom: 0.25rem;
  color: var(--text);
  font-size: 1rem;
}

.empty-state p {
  font-size: 0.85rem;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.settings-row:last-child {
  border-bottom: 0;
}

.settings-row h3 {
  margin-bottom: 0.2rem;
  font-size: 0.92rem;
}

.theme-select {
  width: auto;
  min-width: 150px;
}

@media (max-width: 1000px) {
  .topbar,
  .main-content {
    padding-right: 2rem;
    padding-left: 2rem;
  }
}

@media (max-width: 767px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "topbar"
      "sidebar"
      "main";
  }

  .sidebar {
    gap: 1.2rem;
    padding: 1rem;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-menu {
    flex-direction: row;
    overflow-x: auto;
  }

  .nav-item {
    flex-shrink: 0;
    padding: 0.65rem 0.8rem;
  }

  .nav-item.active::before {
    display: none;
  }

  .sidebar-tip {
    display: none;
  }

  .topbar {
    padding: 1.2rem 1rem;
  }

  .topbar h1 {
    font-size: 1.25rem;
  }

  .user-details {
    display: none;
  }

  .main-content {
    padding: 1.5rem 1rem;
  }

  .hero-section {
    min-height: 190px;
    padding: 1.5rem;
  }

  .hero-decoration {
    display: none;
  }

  .summary-grid,
  .forms-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-button,
  .form-row input {
    width: 100%;
  }

  .settings-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .theme-select,
  .secondary-button {
    width: 100%;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --background: #0f172a;
    --surface: #1e293b;
    --surface-soft: #172033;
    --text: #f8fafc;
    --muted: #94a3b8;
    --border: #334155;
  }
}