/* ============================================
   設計系統 — 帳冊 Ledger
   靈感來自實體會計帳簿:雙線結總、單線小計、
   紅墨記赤字(負債/支出)、黑墨記正數(資產/收入)
   ============================================ */

:root {
  --ink: #16242E;
  --ink-soft: #45565F;
  --paper: #EEEBE1;
  --paper-raised: #F8F6F0;
  --paper-line: #D9D3C2;
  --jade: #2F6F5E;
  --jade-light: #E1ECE7;
  --rust: #A23E2C;
  --rust-light: #F3E2DC;
  --gold: #B8923F;
  --white: #FFFFFF;
  --radius: 3px;
  --font-display: 'Fraunces', serif;
  --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

.hidden { display: none !important; }

/* ---------- 登入畫面 ---------- */
.login-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
}

.login-card {
  background: var(--paper-raised);
  padding: 48px 40px;
  border-radius: var(--radius);
  width: 280px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}

.login-card h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  margin: 0 0 4px;
  letter-spacing: 0.02em;
}

.login-card p {
  color: var(--ink-soft);
  margin: 0 0 24px;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-card input {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 12px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  background: var(--white);
}

.login-card button {
  width: 100%;
}

.error-text {
  color: var(--rust);
  font-size: 0.85rem;
  min-height: 1.2em;
  margin-top: 8px;
}

/* ---------- 整體版面 ---------- */
.app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 220px;
  background: var(--ink);
  color: var(--paper-raised);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 28px 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.8rem;
  margin: 0;
  letter-spacing: 0.02em;
}

.brand-sub {
  margin: 2px 0 0;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: rgba(238,235,225,0.55);
}

.nav {
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  flex: 1;
}

.nav-item {
  text-align: left;
  background: none;
  border: none;
  color: rgba(238,235,225,0.75);
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 12px 24px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background 0.15s, color 0.15s;
}

.nav-item:hover { background: rgba(255,255,255,0.06); color: var(--paper-raised); }

.nav-item.active {
  background: rgba(255,255,255,0.08);
  color: var(--white);
  border-left-color: var(--gold);
  font-weight: 500;
}

.sidebar-footer {
  padding: 16px 24px 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
}

#logout-btn {
  background: none;
  border: 1px solid rgba(238,235,225,0.3);
  color: rgba(238,235,225,0.75);
  padding: 8px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  width: 100%;
  font-family: var(--font-body);
}

.main {
  flex: 1;
  padding: 32px 40px 60px;
  max-width: 1040px;
}

.tab { display: none; }
.tab.active { display: block; }

.tab-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.tab-header h2 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  margin: 0;
}

/* ---------- 按鈕 ---------- */
.btn {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 9px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  cursor: pointer;
}

.btn:hover { background: var(--ink-soft); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--paper-line);
}

.btn-ghost:hover { background: var(--paper-raised); }

.btn-small { font-size: 0.8rem; padding: 6px 12px; margin-bottom: 12px; }

input[type="month"] {
  font-family: var(--font-mono);
  padding: 8px 10px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  background: var(--white);
}

/* ---------- 表單 ---------- */
.inline-form {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--paper-raised);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  align-items: center;
}

.inline-form input,
.inline-form select {
  font-family: var(--font-body);
  padding: 8px 10px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  background: var(--white);
  flex: 1 1 140px;
  min-width: 0;
}

/* ---------- 卡片 / 統計 ---------- */
.card {
  background: var(--paper-raised);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.card h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.hero-figure {
  margin-bottom: 28px;
}

.hero-label {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.hero-number {
  font-family: var(--font-mono);
  font-size: 3.2rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--paper-raised);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 1.6rem;
}

.stat-caption {
  font-size: 0.72rem;
  color: var(--ink-soft);
}

.jade { color: var(--jade); }
.rust { color: var(--rust); }
.mono { font-family: var(--font-mono); }

/* ---------- 帳冊表格 (簽名元素:單線小計、雙線結總) ---------- */
.ledger-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 12px;
}

.ledger-block {
  background: var(--paper-raised);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 20px;
}

.ledger-block-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
}

.ledger-block-header h3 {
  font-family: var(--font-display);
  margin: 0;
  font-size: 1.1rem;
}

.ledger-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.ledger-table td {
  padding: 7px 6px;
  border-bottom: 1px solid var(--paper-line);
  vertical-align: middle;
}

.ledger-group-label td {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  text-transform: uppercase;
  border-bottom: none;
  padding-top: 14px;
}

.ledger-name { font-weight: 500; }
.ledger-currency { color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.82rem; }
.ledger-amount { text-align: right; font-weight: 500; }

.ledger-actions { text-align: right; white-space: nowrap; }
.ledger-actions button {
  background: none;
  border: none;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.78rem;
  padding: 2px 6px;
  text-decoration: underline;
}
.ledger-actions button:hover { color: var(--ink); }

.ledger-subtotal td {
  border-top: 1px solid var(--ink);
  border-bottom: none;
  font-weight: 500;
  padding-top: 8px;
}

.ledger-grandtotal td {
  border-top: 3px double var(--ink);
  border-bottom: none;
  font-weight: 600;
  font-family: var(--font-mono);
  padding-top: 10px;
}

.net-worth-summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 16px 4px 4px;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.total-double {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  border-top: 3px double var(--ink);
  padding-top: 8px;
  min-width: 160px;
  text-align: right;
}

.empty-state {
  color: var(--ink-soft);
  font-size: 0.88rem;
  padding: 16px 0;
}

/* ---------- 預算進度條 ---------- */
.budget-list { display: flex; flex-direction: column; gap: 16px; }

.budget-item {
  background: var(--paper-raised);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.budget-item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  gap: 12px;
}

.budget-item-head button {
  background: none;
  border: none;
  color: var(--ink-soft);
  text-decoration: underline;
  cursor: pointer;
  font-size: 0.78rem;
}

.budget-bar {
  height: 8px;
  background: var(--paper-line);
  border-radius: 4px;
  overflow: hidden;
}

.budget-bar-fill {
  height: 100%;
  background: var(--jade);
  border-radius: 4px;
}

.budget-bar-fill.over { background: var(--rust); }

/* ---------- 響應式 ---------- */
@media (max-width: 860px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between; }
  .sidebar-header { order: 1; border-bottom: none; padding: 14px 16px; }
  .sidebar-footer { order: 2; border-top: none; padding: 0 16px; }
  #logout-btn { width: auto; padding: 6px 14px; font-size: 0.8rem; }
  .nav { order: 3; flex: 1 1 100%; flex-direction: row; overflow-x: auto; padding: 0 8px 8px; }
  .nav-item { border-left: none; border-bottom: 3px solid transparent; white-space: nowrap; }
  .nav-item.active { border-left-color: transparent; border-bottom-color: var(--gold); }
  .main { padding: 24px 18px 48px; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .ledger-columns { grid-template-columns: 1fr; }
}

/* ---------- 無障礙:可見焦點 ---------- */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}