/* ==========================================================================
   随机数生成器 - 全局样式
   设计原则：自然、简洁、专业。克制的配色，合理的留白，清晰的排版层级。
   ========================================================================== */

:root {
  --color-bg: #fafaf8;
  --color-surface: #ffffff;
  --color-border: #e6e4dd;
  --color-text: #23211c;
  --color-text-muted: #6b675e;
  --color-accent: #2f6f5e;        /* 沉稳的墨绿，替代千篇一律的品牌蓝 */
  --color-accent-strong: #26584b;
  --color-accent-soft: #eef4f1;
  --color-warn: #a35d2b;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  --radius: 6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 2px rgba(35, 33, 28, 0.04);
  --shadow-md: 0 2px 8px rgba(35, 33, 28, 0.06);

  --max-width: 860px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text);
  font-weight: 600;
  font-size: 17px;
}

.brand:hover {
  text-decoration: none;
}

.brand-logo {
  display: block;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  gap: 22px;
}

.nav-link {
  color: var(--color-text-muted);
  font-size: 14px;
}

.nav-link:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* ---------- 页面主区域 ---------- */
.page-main {
  padding: 32px 0 48px;
}

.page-title {
  margin: 0 0 6px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-subtitle {
  margin: 0 0 28px;
  color: var(--color-text-muted);
  font-size: 15px;
}

/* ---------- 工具卡片 ---------- */
.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 24px;
}

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.field-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.field-row .field {
  flex: 1 1 160px;
  margin-bottom: 0;
}

.input,
.select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-text);
  transition: border-color 0.15s;
}

.input:focus,
.select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  cursor: pointer;
}

.checkbox input {
  width: 16px;
  height: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn:hover {
  background: var(--color-accent-strong);
}

.btn:active {
  transform: translateY(1px);
}

/* ---------- 结果区 ---------- */
.result-box {
  margin-top: 24px;
  padding: 16px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  background: var(--color-accent-soft);
  min-height: 56px;
}

.result-label {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.result-value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-accent-strong);
  word-break: break-all;
}

.result-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.result-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--color-text);
}

.result-hint {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-warn);
}

.result-time {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- 上次生成记录 ---------- */
.last-box {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.last-label {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.last-value {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  word-break: break-all;
}

.last-time {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- 正文内容区 ---------- */
.content-section {
  margin-top: 48px;
}

.content-section h2 {
  margin: 0 0 4px;
  font-size: 21px;
  font-weight: 700;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.content-section h3 {
  margin: 24px 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.content-section p {
  margin: 8px 0;
  color: #3c3931;
}

.content-section ul,
.content-section ol {
  margin: 8px 0;
  padding-left: 22px;
  color: #3c3931;
}

.content-section li {
  margin: 4px 0;
}

.content-section table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.content-section th,
.content-section td {
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.content-section th {
  background: var(--color-accent-soft);
  font-weight: 600;
}

.faq-item {
  margin-bottom: 16px;
}

.faq-item h3 {
  margin: 0 0 4px;
  font-size: 16px;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 48px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px;
}

.footer-copy {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 13px;
}

.footer-nav {
  display: flex;
  gap: 18px;
}

.footer-nav a {
  color: var(--color-text-muted);
  font-size: 13px;
}

.footer-nav a:hover {
  color: var(--color-text);
}

.footer-contact {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 13px;
}

.footer-contact a {
  color: var(--color-accent);
}

/* ---------- 响应式 ---------- */
@media (max-width: 600px) {
  .page-title {
    font-size: 22px;
  }
  .field-row {
    gap: 12px;
  }
  .field-row .field {
    flex: 1 1 100%;
  }
  .header-inner {
    height: 52px;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}