body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  height: 100vh;
  overflow: hidden;
}

.app {
  display: flex;
  height: 100vh;
  width: 100%;
}

.sidebar {
  width: 220px;
  background: #eef2ff;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  border-right: 4px solid #dce3f0;
}

@media (max-width: 768px) {
  .sidebar {
    width: 180px;
  }
}

@media (max-width: 640px) {
  .sidebar {
    width: 140px;
  }
}

@media (max-width: 480px) {
  .sidebar {
    width: 100px;
  }
}

.sidebar-header {
  padding: 20px 16px;
}

@media (max-width: 640px) {
  .sidebar-header {
    padding: 16px 12px;
  }
}

@media (max-width: 480px) {
  .sidebar-header {
    padding: 12px 8px;
  }
}

.sidebar-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

@media (max-width: 640px) {
  .sidebar-header h3 {
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .sidebar-header h3 {
    font-size: 10px;
  }
}

.sidebar-nav {
  flex: 1;
  padding: 16px 8px;
}

@media (max-width: 640px) {
  .sidebar-nav {
    padding: 12px 6px;
  }
}

.nav-item {
  padding: 10px 12px;
  margin-bottom: 4px;
  border-radius: 8px;
  cursor: pointer;
  color: #334155;
  font-size: 14px;
  transition: all 0.2s;
}

@media (max-width: 768px) {
  .nav-item {
    padding: 8px 10px;
    font-size: 13px;
  }
}

@media (max-width: 640px) {
  .nav-item {
    padding: 6px 8px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .nav-item {
    padding: 5px 6px;
    font-size: 10px;
  }
}

.nav-item:hover {
  background: #e0e7ff;
  color: var(--primary);
}

.nav-item.active {
  background: var(--primary);
  color: #fff;
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #f8fafc;
  overflow: hidden;
}

.top-bar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: #fff;
  border-bottom: 4px solid #e2e8f0;
}

@media (max-width: 768px) {
  .top-bar {
    padding: 12px 20px;
    gap: 12px;
  }
}

@media (max-width: 640px) {
  .top-bar {
    padding: 10px 16px;
    gap: 10px;
  }
}

.home-link {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
}

.home-link img {
  width: 28px;
  height: 28px;
}

@media (max-width: 640px) {
  .home-link img {
    width: 22px;
    height: 22px;
  }
}

.top-bar h1 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

@media (max-width: 768px) {
  .top-bar h1 {
    font-size: 18px;
  }
}

@media (max-width: 640px) {
  .top-bar h1 {
    font-size: 16px;
  }
}

.content-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px;
}

@media (max-width: 768px) {
  .content-scroll {
    padding: 20px 24px;
  }
}

@media (max-width: 640px) {
  .content-scroll {
    padding: 16px;
  }
}

.page-content {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.form-group {
  margin-bottom: 20px;
}

@media (max-width: 640px) {
  .form-group {
    margin-bottom: 16px;
  }
}

label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

@media (max-width: 640px) {
  label {
    font-size: 13px;
    margin-bottom: 6px;
  }
}

input,
textarea,
select {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid #e2e8f0;
  border-radius: 6px;
  font-size: 14px;
  font-family: monospace;
  background: #fff;
  transition: border-color 0.2s;
}

@media (max-width: 640px) {
  input,
  textarea,
  select {
    padding: 8px 10px;
    font-size: 13px;
  }
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
}

textarea {
  height: 80px;
  resize: vertical;
}

@media (max-width: 640px) {
  textarea {
    height: 70px;
  }
}

.input-row {
  display: flex;
  gap: 12px;
}

.input-row textarea {
  flex: 1;
}

@media (max-width: 640px) {
  .input-row {
    flex-direction: column;
    gap: 12px;
  }
}

.result-footer {
  flex-shrink: 0;
  height: 180px;
  background: #f1f5f9;
  border-top: 4px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

@media (max-width: 768px) {
  .result-footer {
    height: 160px;
  }
}

@media (max-width: 640px) {
  .result-footer {
    height: 140px;
  }
}

.calc-icon {
  position: absolute;
  top: 8px;
  right: 16px;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s;
  z-index: 10;
  padding: 4px;
}

.calc-icon:hover {
  opacity: 0.7;
}

.calc-icon img {
  width: 28px;
  height: 28px;
}

@media (max-width: 768px) {
  .calc-icon {
    top: 6px;
    right: 14px;
  }
  .calc-icon img {
    width: 24px;
    height: 24px;
  }
}

@media (max-width: 640px) {
  .calc-icon {
    top: 4px;
    right: 12px;
  }
  .calc-icon img {
    width: 20px;
    height: 20px;
  }
}

/* ── 结果展示区 ── */
.result-content {
  flex: 1;
  overflow-y: auto;
  padding: 12px 20px;
  padding-right: 70px;
  font-family: monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-all;
}

@media (max-width: 768px) {
  .result-content {
    padding: 10px 16px;
    padding-right: 60px;
    font-size: 12px;
  }
}

@media (max-width: 640px) {
  .result-content {
    padding: 8px 12px;
    padding-right: 50px;
    font-size: 11px;
  }
}

/* ── 拖拽手柄 ── */
.resize-handle {
  flex-shrink: 0;
  background: transparent;
  transition: background 0.2s;
  z-index: 20;
}

/* 水平拖拽（侧边栏宽度） */
.resize-handle-h {
  width: 4px;
  cursor: col-resize;
}

/* 垂直拖拽（结果栏高度） */
.resize-handle-v {
  height: 4px;
  cursor: row-resize;
}

.resize-handle:hover,
.resize-handle.resize-active {
  background: var(--primary);
}

.err {
  color: var(--text-2);
  font-size: 12px;
  margin-top: 6px;
}