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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #22263a;
  --border: #2e3352;
  --text: #e2e8f0;
  --muted: #8892a4;
  --green: #22c55e;
  --green-dim: #16432d;
  --red: #ef4444;
  --red-dim: #3d1515;
  --orange: #f59e0b;
  --orange-dim: #3d2a07;
  --blue: #3b82f6;
  --radius: 10px;
  --radius-sm: 6px;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ─── AUTH ─────────────────────────────────────── */
#auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 380px;
}

.auth-box h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
.auth-box p  { color: var(--muted); margin-bottom: 1.75rem; font-size: 0.875rem; }

/* ─── LAYOUT ────────────────────────────────────── */
#app { display: none; min-height: 100vh; }

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

header h2 { font-size: 1.1rem; }

.main { padding: 1.5rem; max-width: 900px; margin: 0 auto; }

/* ─── FORMS ─────────────────────────────────────── */
.form-group { margin-bottom: 1rem; }

label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: 0.4rem;
}

input, select, textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.6rem 0.85rem;
  font-size: 0.95rem;
  outline: none;
  transition: border-color .15s;
}

input:focus, select:focus, textarea:focus { border-color: var(--blue); }
select option { background: var(--surface2); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* ─── BUTTONS ───────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.btn:hover { opacity: .85; }
.btn:active { transform: scale(.97); }

.btn-primary { background: var(--blue); color: #fff; }
.btn-danger  { background: var(--red-dim); color: var(--red); border: 1px solid var(--red); }
.btn-ghost   { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-green   { background: var(--green-dim); color: var(--green); border: 1px solid var(--green); }
.btn-full    { width: 100%; justify-content: center; }

/* ─── ANALYTICS CARDS ───────────────────────────── */
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}

.stat-card .label { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 0.5rem; }
.stat-card .value { font-size: 1.75rem; font-weight: 700; }
.stat-card.positive .value { color: var(--green); }
.stat-card.negative .value { color: var(--red); }
.stat-card.neutral  .value { color: var(--text); }
.stat-card.warning  .value { color: var(--orange); }

/* ─── FILTERS ───────────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.4rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all .15s;
}
.filter-btn:hover { border-color: var(--blue); color: var(--text); }
.filter-btn.active { background: var(--blue); border-color: var(--blue); color: #fff; }

/* ─── CURRENCY BAR ──────────────────────────────── */
.currency-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.currency-label {
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-right: 0.25rem;
}

.currency-btn {
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.currency-btn:hover { border-color: var(--blue); color: var(--text); }
.currency-btn.active { background: var(--surface2); border-color: var(--blue); color: var(--blue); }

.rates-badge {
  font-size: 0.72rem;
  color: var(--muted);
  margin-left: 0.25rem;
}

.converted-amount {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

/* ─── DEBT CARDS ────────────────────────────────── */
.debt-list { display: flex; flex-direction: column; gap: 0.75rem; }

.debt-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.debt-card:hover { border-color: var(--blue); background: var(--surface2); }
.debt-card.owed  { border-left: 3px solid var(--green); }
.debt-card.owe   { border-left: 3px solid var(--red); }
.debt-card.overdue { border-left: 3px solid var(--orange); background: color-mix(in srgb, var(--surface) 95%, var(--orange)); }
.debt-card.closed { opacity: .5; }

.debt-card-info { flex: 1; min-width: 0; }
.debt-card-title { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.debt-card-meta  { font-size: 0.8rem; color: var(--muted); margin-top: 0.2rem; }

.debt-card-amount { text-align: right; white-space: nowrap; }
.debt-card-amount .amount { font-size: 1.1rem; font-weight: 700; }
.debt-card-amount .amount.positive { color: var(--green); }
.debt-card-amount .amount.negative { color: var(--red); }
.debt-card-amount .remaining { font-size: 0.75rem; color: var(--muted); }

.tag {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.tag-green  { background: var(--green-dim); color: var(--green); }
.tag-red    { background: var(--red-dim); color: var(--red); }
.tag-orange { background: var(--orange-dim); color: var(--orange); }
.tag-muted  { background: var(--surface2); color: var(--muted); }

/* ─── DEBT DETAIL ────────────────────────────────── */
.back-btn { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 0.875rem; display: flex; align-items: center; gap: 0.4rem; margin-bottom: 1.25rem; padding: 0; }
.back-btn:hover { color: var(--text); }

.detail-header {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}
.detail-header h2 { font-size: 1.4rem; margin-bottom: 0.25rem; }
.detail-header .meta { color: var(--muted); font-size: 0.875rem; margin-bottom: 1rem; }

.detail-amounts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}
.amount-block { text-align: center; }
.amount-block .lbl { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.amount-block .val { font-size: 1.3rem; font-weight: 700; margin-top: 0.2rem; }

.progress-bar {
  height: 6px;
  background: var(--surface2);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 0.75rem;
}
.progress-fill { height: 100%; border-radius: 999px; transition: width .4s; }
.progress-fill.green  { background: var(--green); }
.progress-fill.red    { background: var(--red); }
.progress-fill.orange { background: var(--orange); }

/* ─── PAYMENT SECTION ────────────────────────────── */
.section-title { font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 0.75rem; }

.payment-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}
.payment-form .form-group { flex: 1; margin: 0; }

.payment-list { display: flex; flex-direction: column; gap: 0.5rem; }
.payment-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}
.payment-item .p-date { color: var(--muted); }
.payment-item .p-amount { font-weight: 600; color: var(--green); }

/* ─── MODAL / PAGE TRANSITIONS ──────────────────── */
.page { display: none; }
.page.active { display: block; }

/* ─── EMPTY STATE ───────────────────────────────── */
.empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
}
.empty svg { margin-bottom: 1rem; opacity: .4; }
.empty p { font-size: 0.9rem; }

/* ─── TOAST ─────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  z-index: 1000;
  transform: translateY(100px);
  opacity: 0;
  transition: all .3s;
  max-width: 320px;
}
#toast.show { transform: translateY(0); opacity: 1; }
#toast.success { border-color: var(--green); color: var(--green); }
#toast.error   { border-color: var(--red);   color: var(--red); }

/* ─── SCROLLBAR ─────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }