/* ============================================================
   Toolbox — 共享样式 (Shared Styles)
   所有页面公共的 CSS 变量、重置、布局组件和表单元素
   ============================================================ */

/* ===== CSS Variables: Dark Theme ===== */
:root {
  --bg-deep: #020617;
  --bg-panel: #0E1223;
  --bg-card: #1A1E2F;
  --border: rgba(51, 65, 85, 0.6);
  --border-accent: rgba(34, 197, 94, 0.25);
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent: #22C55E;
  --accent-dim: #15803D;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

/* ===== CSS Variables: Light Theme ===== */
[data-theme="light"] {
  --bg-deep: #F8FAFC;
  --bg-panel: #F1F5F9;
  --bg-card: #FFFFFF;
  --border: rgba(148, 163, 184, 0.4);
  --border-accent: rgba(22, 163, 74, 0.25);
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --accent: #16A34A;
  --accent-dim: #15803D;
}

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

/* ===== Base ===== */
html, body {
  width: 100%; min-height: 100%;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  display: flex;
  flex-direction: column;
  transition: background 0.3s, color 0.3s;
}

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

/* ===== Back Link (子工具页面) ===== */
.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: color 0.2s, border-color 0.2s;
}
.back-link:hover { color: var(--accent); border-color: var(--accent); }

/* ===== Theme Toggle (月亮/太阳图标) ===== */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  padding: 0;
  transition: border-color 0.2s, transform 0.2s;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--accent); transform: rotate(15deg); }
.theme-toggle svg {
  width: 18px; height: 18px;
  position: absolute;
  transition: opacity 0.3s, transform 0.4s;
}
.theme-toggle .icon-moon  { opacity: 1; transform: rotate(0); }
.theme-toggle .icon-sun   { opacity: 0; transform: rotate(90deg) scale(0.5); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="light"] .theme-toggle .icon-sun  { opacity: 1; transform: rotate(0) scale(1); }
.theme-toggle svg { stroke: var(--text-secondary); }
.theme-toggle:hover svg { stroke: var(--accent); }

/* ===== Section Label ===== */
.section-label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 700;
}

/* ===== Form Elements: Input & Select ===== */
input, select {
  height: 34px;
  padding: 0 10px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  border-radius: 4px;
  outline: none;
  transition: border-color 0.2s;
}
input:focus, select:focus { border-color: var(--accent); }
select { cursor: pointer; }

/* ===== Animations ===== */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}