@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@300;400;500;600&display=swap');

:root {
  --bg:          #F5F3EF;
  --surface:     #FFFFFF;
  --surface-2:   #EDEAE4;
  --border:      rgba(0,0,0,0.10);
  --border-strong: rgba(0,0,0,0.20);
  --text:        #1C1B18;
  --text-muted:  #7A7770;
  --text-light:  #A8A5A0;

  --green:       #1A7A5A;
  --green-bg:    #E8F5EF;
  --red:         #C0392B;
  --red-bg:      #FBEAEA;
  --amber:       #9A6200;
  --amber-bg:    #FDF3DC;
  --blue:        #1A4A8A;
  --blue-bg:     #E8EEFA;
  --purple:      #5A2D8A;
  --purple-bg:   #F0EAF8;

  --accent:      #1C1B18;
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --nav-h:       52px;
  --font-mono:   'IBM Plex Mono', monospace;
  --font-sans:   'IBM Plex Sans', sans-serif;
  --shadow:      0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.10);
}

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

html { font-size: 15px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  padding-top: var(--nav-h);
}

/* ── Navigation ─────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--text);
  display: flex; align-items: center;
  padding: 0 1.25rem;
  gap: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-brand {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: #fff;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-right: auto;
  text-decoration: none;
}
.nav-links { display: flex; gap: 0.125rem; }
.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 400;
  color: rgba(255,255,255,0.55);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover { color: #fff; background: rgba(255,255,255,0.08); }
.nav-links a.active { color: #fff; background: rgba(255,255,255,0.15); }
.nav-links a.nav-button {
  color: #fff;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.16);
}
.nav-links a.nav-button:hover { background: rgba(255,255,255,0.18); }

/* ── Layout ──────────────────────────────────────── */
.page { max-width: 1080px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; }
.page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.5rem; gap: 1rem; flex-wrap: wrap;
}
.page-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ── Month Selector ───────────────────────────────── */
.month-selector {
  display: flex; align-items: center; gap: 0.5rem;
}
.month-selector button {
  width: 28px; height: 28px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer; font-size: 0.9rem; color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  transition: border-color 0.15s;
}
.month-selector button:hover { border-color: var(--border-strong); color: var(--text); }
.month-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  min-width: 9rem; text-align: center;
}

/* ── Cards ───────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow);
}
.card-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: 0.3rem;
}
.card-value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text);
}
.card-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ── Summary cards row ───────────────────────────── */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.summary-cards .card-value.negative { color: var(--red); }
.summary-cards .card-value.positive { color: var(--green); }

/* ── Tables ──────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}
table { width: 100%; border-collapse: collapse; }
thead th {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-light);
  padding: 0.65rem 1rem;
  text-align: left;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
thead th.right { text-align: right; }
tbody tr { border-bottom: 1px solid var(--border); transition: background 0.1s; }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--surface-2); }
tbody td {
  font-size: 0.83rem;
  padding: 0.6rem 1rem;
  color: var(--text);
  vertical-align: middle;
}
tbody td.mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
tbody td.right { text-align: right; }
tbody td.muted { color: var(--text-muted); }
tbody td.negative { color: var(--red); font-family: var(--font-mono); font-size: 0.8rem; }
tbody td.positive { color: var(--green); font-family: var(--font-mono); font-size: 0.8rem; }
tfoot td {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.65rem 1rem;
  border-top: 2px solid var(--border-strong);
  background: var(--surface-2);
  font-family: var(--font-mono);
}
tfoot td.right { text-align: right; }

/* section heading inside a table area */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  padding: 0.5rem 1rem 0.25rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}

/* ── Badges ─────────────────────────────────────── */
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
}
.badge-expense  { background: var(--red-bg);    color: var(--red);   }
.badge-income   { background: var(--green-bg);  color: var(--green); }
.badge-transfer { background: var(--blue-bg);   color: var(--blue);  }

/* ── Forms ───────────────────────────────────────── */
.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  max-width: 520px;
  margin: 0 auto;
}
.form-tabs {
  display: flex; gap: 0.25rem;
  margin-bottom: 1.5rem;
  background: var(--surface-2);
  padding: 0.25rem;
  border-radius: var(--radius-md);
}
.tab-btn {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background: none; border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.tab-btn.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}
.form-group { margin-bottom: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
input[type="text"], input[type="number"], input[type="date"],
select, textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text);
  min-height: 44px;
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: none;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--text);
  box-shadow: 0 0 0 2px rgba(28,27,24,0.08);
}
.amount-input {
  font-family: var(--font-mono) !important;
  font-size: 1.3rem !important;
  font-weight: 500;
  padding: 0.7rem 0.75rem !important;
}
.input-prefix {
  position: relative;
}
.input-prefix span {
  position: absolute;
  left: 0.75rem; top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  pointer-events: none;
}
.input-prefix input { padding-left: 2.8rem; }

/* ── Buttons ─────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border: none; border-radius: var(--radius-sm);
  font-family: var(--font-sans); font-size: 0.85rem; font-weight: 500;
  cursor: pointer; transition: opacity 0.15s, transform 0.1s;
  text-decoration: none; min-height: 40px;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--text); color: #fff; width: 100%; }
.btn-primary:hover { opacity: 0.85; }
.btn-ghost {
  background: none; border: 1px solid var(--border-strong);
  color: var(--text-muted);
}
.btn-ghost:hover { border-color: var(--text); color: var(--text); }
.btn-danger { background: var(--red-bg); color: var(--red); }
.btn-danger:hover { opacity: 0.8; }
.btn-sm { padding: 0.3rem 0.65rem; font-size: 0.75rem; min-height: 30px; }

/* ── Toast ───────────────────────────────────────── */
#toast {
  position: fixed; bottom: 1.5rem; left: 50%;
  transform: translateX(-50%) translateY(4rem);
  background: var(--text); color: #fff;
  font-size: 0.82rem; font-family: var(--font-mono);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform 0.25s cubic-bezier(0.34,1.56,0.64,1);
  z-index: 200; white-space: nowrap; pointer-events: none;
}
#toast.show { transform: translateX(-50%) translateY(0); }
#toast.error { background: var(--red); }

/* ── Charts ───────────────────────────────────────── */
.charts-row {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 0.75rem; margin-bottom: 1.25rem;
}
.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow);
}
.chart-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: 1rem;
}
.chart-wrap { position: relative; height: 200px; }

/* ── Filters bar ─────────────────────────────────── */
.filters {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 1rem; align-items: center;
}
.filters select, .filters input {
  min-height: 36px; font-size: 0.8rem; padding: 0.35rem 0.65rem; width: auto;
}

/* ── Empty state ─────────────────────────────────── */
.empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.empty span {
  display: block;
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

/* ── Account type group headers ───────────────────── */
.group-header td {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  background: var(--surface-2);
  padding: 0.4rem 1rem;
  border-bottom: 1px solid var(--border);
}

/* ── Delete confirmation ────────────────────────── */
.confirm-row { display: flex; gap: 0.5rem; justify-content: flex-end; }

/* ── Modal overlay ───────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex; align-items: center; justify-content: center;
  z-index: 150; padding: 1rem;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-width: 480px; width: 100%;
  box-shadow: var(--shadow-md);
  transform: translateY(8px);
  transition: transform 0.2s;
}
.modal-overlay.open .modal { transform: translateY(0); }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.25rem;
}
.modal-header h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.modal-close {
  background: none; border: none; cursor: pointer;
  color: var(--text-muted); font-size: 1.1rem;
  padding: 0.2rem; line-height: 1;
}

/* ── Summary year table tweaks ──────────────────── */
.summary-table th.month-col { text-align: right; min-width: 72px; }
.summary-table td.month-col { text-align: right; font-family: var(--font-mono); font-size: 0.75rem; }
.summary-table td.zero { color: var(--text-light); }

/* ── Loading spinner ────────────────────────────── */
.spinner {
  width: 1.25rem; height: 1.25rem;
  border: 2px solid var(--border-strong);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 2rem auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 640px) {
  .charts-row { grid-template-columns: 1fr; }
  .form-row   { grid-template-columns: 1fr; }
  .summary-cards { grid-template-columns: 1fr 1fr; }
  nav { overflow-x: auto; }
  .nav-links { flex-wrap: nowrap; }
  .nav-links a { padding: 0.4rem 0.5rem; font-size: 0.75rem; }
  .page { padding: 1rem 0.9rem 3rem; }
  .amount-input { font-size: 1.1rem !important; }
  thead th, tbody td, tfoot td { padding: 0.5rem 0.65rem; }
}
@media (max-width: 400px) {
  .summary-cards { grid-template-columns: 1fr; }
}