/* ==========================================================================
   taxpensify - 全局样式
   浅色为主，支持深色模式（prefers-color-scheme），移动端优先响应式
   ========================================================================== */

:root {
  --color-bg: #f4f6fb;
  --color-surface: #ffffff;
  --color-surface-2: #f0f3f9;
  --color-border: #e2e7f0;
  --color-text: #1f2733;
  --color-text-secondary: #5a6780;
  --color-text-muted: #8a94a6;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: #e8effd;
  --color-success: #16a34a;
  --color-success-soft: #e7f6ec;
  --color-warning: #d97706;
  --color-warning-soft: #fdf3e3;
  --color-danger: #dc2626;
  --color-danger-soft: #fdeaea;
  --shadow-panel: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-modal: 0 20px 50px rgba(16, 24, 40, 0.2);
  --radius: 10px;
  --radius-sm: 6px;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #10141b;
    --color-surface: #1a202c;
    --color-surface-2: #232b3a;
    --color-border: #2e3848;
    --color-text: #e5e9f0;
    --color-text-secondary: #a8b3c4;
    --color-text-muted: #6b7686;
    --color-primary: #60a5fa;
    --color-primary-hover: #93c5fd;
    --color-primary-soft: #1c2a44;
    --color-success: #4ade80;
    --color-success-soft: #132a1a;
    --color-warning: #fbbf24;
    --color-warning-soft: #2a2213;
    --color-danger: #f87171;
    --color-danger-soft: #2c1515;
    --shadow-panel: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-modal: 0 20px 50px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 头部 ---------- */
.app-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.app-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 12px; }

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), #7c3aed);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-text h1 { margin: 0; font-size: 17px; font-weight: 700; }

.brand-text p { margin: 2px 0 0; font-size: 12px; color: var(--color-text-muted); }

.header-actions { display: flex; gap: 8px; }

/* ---------- Tab 导航 ---------- */
.tab-nav {
  display: flex;
  gap: 4px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px 0;
  overflow-x: auto;
}

.tab-btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius) var(--radius) 0 0;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover { color: var(--color-primary); }

.tab-btn.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background: var(--color-surface);
}

/* ---------- 布局 ---------- */
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }

.view { display: none; }

.view.is-active { display: block; }

.view-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 20px;
  align-items: start;
}

@media (max-width: 768px) {
  .view-grid { grid-template-columns: 1fr; }
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
  padding: 20px;
}

.panel-title {
  margin: 0 0 16px;
  font-size: 15px;
  font-weight: 700;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

/* ---------- 表单 ---------- */
.calc-form { display: flex; flex-direction: column; gap: 14px; }

.field { display: flex; flex-direction: column; gap: 6px; }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

@media (max-width: 480px) {
  .field-row { grid-template-columns: 1fr; }
}

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.field input[type="number"],
.field input[type="month"],
.field select,
.field-inline input[type="number"],
.field-inline select,
.params-json {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus,
.field select:focus,
.field-inline input:focus,
.field-inline select:focus,
.params-json:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.field-hint { margin: 0; font-size: 12px; color: var(--color-text-muted); }

.field-hint.is-error { color: var(--color-danger); }

.field-inline {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.field-inline label { font-size: 13px; color: var(--color-text-secondary); min-width: 90px; }

.field-inline input[type="number"],
.field-inline select { width: 110px; padding: 6px 8px; }

.unit { font-size: 12px; color: var(--color-text-muted); }

.input-group { display: flex; gap: 8px; }

.input-group input { flex: 1; }

.checkbox-field { justify-content: center; }

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
  cursor: pointer;
  user-select: none;
}

.checkbox input { accent-color: var(--color-primary); }

/* 折叠面板 */
.collapsible {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
}

.collapsible summary {
  cursor: pointer;
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  user-select: none;
}

.collapsible[open] summary { border-bottom: 1px solid var(--color-border); }

.collapsible-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* 按钮 */
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

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

.btn-outline { border-color: var(--color-border); color: var(--color-text); background: var(--color-surface); }
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-ghost { color: var(--color-text-secondary); background: transparent; }
.btn-ghost:hover { color: var(--color-primary); background: var(--color-primary-soft); }

.btn-small { padding: 5px 10px; font-size: 12px; }

.form-actions { display: flex; gap: 8px; margin-top: 4px; }

/* ---------- 结果区 ---------- */
.result-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
}

.result-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.summary-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.summary-card .label { font-size: 12px; color: var(--color-text-muted); }

.summary-card .value {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-top: 2px;
}

.summary-card .sub { font-size: 12px; color: var(--color-text-muted); margin-top: 2px; }

.summary-card.is-success .value { color: var(--color-success); }
.summary-card.is-primary .value { color: var(--color-primary); }
.summary-card.is-warning .value { color: var(--color-warning); }

/* 明细表格 */
.detail-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 8px 0 16px;
}

.detail-table th,
.detail-table td {
  text-align: right;
  padding: 7px 10px;
  border-bottom: 1px solid var(--color-border);
}

.detail-table th { color: var(--color-text-muted); font-weight: 600; }

.detail-table th:first-child,
.detail-table td:first-child { text-align: left; }

.detail-table tfoot td {
  font-weight: 700;
  border-top: 2px solid var(--color-border);
  border-bottom: none;
}

/* 计算过程 */
.process-block {
  margin-top: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
}

.process-block summary {
  cursor: pointer;
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  user-select: none;
}

.process-block[open] summary { border-bottom: 1px solid var(--color-border); }

.process-body {
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  color: var(--color-text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
}

/* 提示条 */
.notice {
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 12px;
  margin: 8px 0;
}

.notice-info { background: var(--color-primary-soft); color: var(--color-primary); }
.notice-warn { background: var(--color-warning-soft); color: var(--color-warning); }
.notice-danger { background: var(--color-danger-soft); color: var(--color-danger); }

/* ---------- 弹层 ---------- */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(16, 24, 40, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}

.modal-mask[hidden] { display: none; }

.modal[hidden] { display: none; }

.modal {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-modal);
  width: 100%;
  max-width: 640px;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 { margin: 0; font-size: 16px; }

.modal-close {
  appearance: none;
  border: none;
  background: transparent;
  font-size: 22px;
  line-height: 1;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.modal-close:hover { color: var(--color-text); background: var(--color-surface-2); }

.modal-body { padding: 16px 20px; overflow-y: auto; }

.modal-body h3 { font-size: 14px; margin: 18px 0 10px; }

.modal-body h3:first-child { margin-top: 0; }

.modal-tip { font-size: 12px; color: var(--color-text-muted); margin: 0 0 10px; }

.modal-error { color: var(--color-danger); font-size: 12px; margin: 8px 0 0; }

.modal-footer {
  display: flex;
  gap: 8px;
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
  justify-content: flex-end;
}

.params-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 480px) {
  .params-grid { grid-template-columns: 1fr; }
}

.params-grid .field label { font-size: 12px; }

.params-json {
  font-family: var(--font-mono);
  font-size: 12px;
  resize: vertical;
  min-height: 160px;
}

/* 历史列表 */
.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}

.history-item .meta { font-size: 12px; color: var(--color-text-muted); }

.history-item .title { font-weight: 600; font-size: 13px; }

.history-item .actions { display: flex; gap: 6px; flex-shrink: 0; }

.history-empty { color: var(--color-text-muted); text-align: center; padding: 20px 0; }

/* ---------- 页脚 ---------- */
.app-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  margin-top: 24px;
}

.app-footer p {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 20px;
  font-size: 12px;
  color: var(--color-text-muted);
  text-align: center;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  background: var(--color-text);
  color: var(--color-bg);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  box-shadow: var(--shadow-modal);
  z-index: 200;
  animation: toast-in 0.2s ease-out;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ---------- 打印 ---------- */
@media print {
  .app-header, .tab-nav, .form-panel, .header-actions, .modal-mask {
    display: none !important;
  }
  .view { display: block !important; }
  .panel { box-shadow: none; border: 1px solid #ccc; }
  body { background: #fff; }
}