/* ─── CSS Custom Properties (Light Theme) ───────────────── */
:root {
  --bg: #f4f5f7;
  --card-bg: #fff;
  --card-shadow: rgba(0, 0, 0, 0.08);
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border: #d1d5db;
  --input-bg: #fafafa;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-disabled: #a5b4fc;
  --accent-light: #eef2ff;
  --accent-border: #c7d2fe;
  --accent-glow: rgba(79, 70, 229, 0.12);
  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-text: #065f46;
  --success-border: #a7f3d0;
  --error: #ef4444;
  --error-bg: #fef2f2;
  --error-text: #991b1b;
  --error-border: #fecaca;
  --budget-item-bg: #f9fafb;
  --budget-item-border: #e5e7eb;
  --table-border: #f3f4f6;
}

/* ─── Dark Theme ────────────────────────────────────────── */
[data-theme="dark"] {
  --bg: #0f1117;
  --card-bg: #1a1d2e;
  --card-shadow: rgba(0, 0, 0, 0.3);
  --text: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --border: #374151;
  --input-bg: #111827;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-disabled: #4338ca;
  --accent-light: #1e1b4b;
  --accent-border: #3730a3;
  --accent-glow: rgba(99, 102, 241, 0.2);
  --success-bg: #064e3b;
  --success-text: #a7f3d0;
  --success-border: #065f46;
  --error-bg: #450a0a;
  --error-text: #fecaca;
  --error-border: #991b1b;
  --budget-item-bg: #111827;
  --budget-item-border: #374151;
  --table-border: #1f2937;
}

/* ─── Reset & Base ──────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  transition: background 0.2s, color 0.2s;
}

/* ─── Tabs ───────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 0;
  background: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 1px 8px var(--card-shadow);
  overflow: hidden;
  margin-bottom: 1rem;
}

.tab {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-bottom: 2.5px solid transparent;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.tab:hover {
  color: var(--text);
  background: var(--accent-light);
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.text-muted {
  color: var(--text-secondary);
  text-align: center;
  padding: 1.5rem 0;
}

/* ─── Theme Toggle ──────────────────────────────────────── */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 1.125rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s;
  z-index: 100;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

/* ─── Card ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#main-app {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 2px 16px var(--card-shadow);
  padding: 2.5rem 2rem;
  transition: background 0.2s, box-shadow 0.2s;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

h2 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

/* ─── Fields ────────────────────────────────────────────── */
.field {
  margin-bottom: 1.25rem;
}

.field-row {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0;
}

.field-currency {
  flex: 0 0 120px;
}

.field-amount {
  flex: 1;
}

label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.375rem;
}

.optional-tag {
  font-weight: 400;
  color: var(--text-muted);
}

input,
textarea,
select {
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-size: 0.9375rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s, background 0.2s;
  outline: none;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input.invalid,
textarea.invalid,
select.invalid {
  border-color: var(--error);
}

textarea {
  resize: vertical;
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%236b7280' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

.error-msg {
  display: block;
  font-size: 0.75rem;
  color: var(--error);
  min-height: 1.125rem;
  margin-top: 0.25rem;
}

/* ─── Conversion Note ───────────────────────────────────── */
.conversion-note {
  font-size: 0.8125rem;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  margin-bottom: 1.25rem;
  animation: fadeIn 0.2s ease;
}

/* ─── File Upload ───────────────────────────────────────── */
.file-upload {
  position: relative;
  border: 1.5px dashed var(--border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.file-upload:hover,
.file-upload.dragover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.file-upload input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
  border: none;
  padding: 0;
}

.file-upload-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  pointer-events: none;
}

.file-upload-icon {
  font-size: 1.125rem;
}

.file-upload.has-file {
  border-color: var(--success);
  background: var(--success-bg);
}

.file-upload.has-file .file-upload-label {
  color: var(--success-text);
}

/* ─── Buttons ───────────────────────────────────────────── */
.primary-btn {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background-color 0.15s;
  margin-top: 0.5rem;
}

.primary-btn:hover {
  background: var(--accent-hover);
}

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

.secondary-btn {
  width: 100%;
  padding: 0.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  border: 1.5px solid var(--accent-border);
  border-radius: 8px;
  cursor: pointer;
  margin-top: 1.25rem;
  transition: background 0.15s;
}

.secondary-btn:hover {
  background: var(--accent-glow);
}

/* Spinner */
.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.inline-spinner {
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  flex-shrink: 0;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ─── Toast ─────────────────────────────────────────────── */
.toast {
  margin-top: 1.25rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  animation: fadeIn 0.25s ease;
}

.toast.success {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

.toast.error {
  background: var(--error-bg);
  color: var(--error-text);
  border: 1px solid var(--error-border);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── Confirmation ──────────────────────────────────────── */
.confirmation {
  animation: fadeIn 0.3s ease;
}

/* Success checkmark animation */
.success-checkmark {
  display: flex;
  justify-content: center;
  margin-bottom: 1rem;
}
.checkmark-svg {
  width: 64px;
  height: 64px;
}
.checkmark-circle {
  stroke: var(--success-text);
  stroke-width: 2;
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  animation: checkStroke 0.6s ease forwards;
}
.checkmark-path {
  stroke: var(--success-text);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: checkStroke 0.4s 0.4s ease forwards;
}
@keyframes checkStroke {
  to { stroke-dashoffset: 0; }
}

.confirmation h2 {
  color: var(--success-text);
  margin-bottom: 1rem;
}

.confirmation-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.5rem;
}

.confirmation-table th,
.confirmation-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--table-border);
}

.confirmation-table th {
  color: var(--text-secondary);
  font-weight: 500;
  width: 110px;
}

.confirmation-table td {
  color: var(--text);
  font-weight: 600;
}

.confirmation-table a {
  color: var(--accent);
  text-decoration: none;
}

.confirmation-table a:hover {
  text-decoration: underline;
}

/* ─── Budget Panel ──────────────────────────────────────── */
.budget-card {
  padding: 1.5rem 2rem;
}

.budget-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
}

.budget-item {
  background: var(--budget-item-bg);
  border: 1px solid var(--budget-item-border);
  border-radius: 8px;
  padding: 0.625rem 0.75rem;
  transition: background 0.2s, border-color 0.2s;
}

.budget-item .cat-name {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.125rem;
}

.budget-item .cat-amounts {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text);
}

.budget-item .cat-spent {
  color: var(--text);
}

.budget-item .cat-separator {
  color: var(--border);
  font-weight: 400;
}

.budget-item .cat-planned {
  color: var(--text-muted);
  font-weight: 500;
}

.budget-item .cat-remaining {
  font-size: 0.6875rem;
  color: var(--success);
  font-weight: 500;
  margin-top: 0.125rem;
}

.budget-item .cat-remaining.over-budget {
  color: var(--error);
}

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 520px) {
  .card {
    padding: 1.75rem 1.25rem;
  }

  .budget-card {
    padding: 1.25rem;
  }

  .budget-list {
    grid-template-columns: 1fr;
  }

  .field-row {
    flex-direction: column;
    gap: 0;
  }

  .field-currency {
    flex: 1;
  }
}