/* 基础样式 */
:root {
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --border: #1f2937;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, "Noto Sans", "Noto Sans CJK", sans-serif;
  background: linear-gradient(120deg, #0b1022, #0f172a 35%, #0b1022);
  color: var(--text);
}
header {
  max-width: 960px; margin: 0 auto; padding: 20px 16px;
}
nav a { color: var(--text); text-decoration: none; font-weight: 600; }
nav a[aria-current="page"] { color: var(--primary); }
nav .divider { color: var(--muted); margin: 0 8px; }

main { max-width: 960px; margin: 0 auto; padding: 10px 16px 40px; }
h1 { font-size: 2rem; margin: 8px 0 4px; }
.lead { color: var(--muted); margin-top: 0; }

.card {
  background: radial-gradient(1200px 600px at 0% 0%, rgba(59,130,246,0.15), rgba(17,24,39,0.95) 50%), var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  margin: 16px 0;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.form-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px 16px; align-items: end;
}
.form-item { display: flex; flex-direction: column; }
label { font-size: 0.95rem; margin-bottom: 6px; color: var(--muted); }
input, select {
  background: #0b1220; color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px; font-size: 1rem; outline: none;
}
input:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.2); }

.form-actions { display: flex; gap: 8px; }
button {
  border: none; border-radius: 10px; padding: 10px 14px; font-size: 1rem; font-weight: 600; cursor: pointer;
  background: var(--primary); color: white; transition: background .2s ease;
}
button:hover { background: var(--primary-hover); }
button.secondary { background: #334155; }

.result { margin-top: 12px; font-weight: 600; }

.seo-faq details { background: #0b1220; border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; margin-top: 8px; }
.seo-faq summary { cursor: pointer; font-weight: 600; }

footer { max-width: 960px; margin: 0 auto; padding: 20px 16px; color: var(--muted); }

/* 响应式 */
@media (max-width: 720px) {
  .form-grid { grid-template-columns: 1fr; }
}
input[type="date"] {
  background: #0a1426; /* 更深，突出对比 */
  border: 1px solid #2b3a55; /* 明显边框 */
  color: var(--text);
}
input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(92%) saturate(140%) contrast(120%);
  opacity: 1;
}
input[type="date"]:hover {
  border-color: #3c4e72;
}
input[type="date"]:focus {
  border-color: #5b8cff;
  outline: 2px solid #5b8cff; /* 可见焦点 */
  box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.25); /* 高亮光晕 */
  background: #0d1a33; /* 焦点时更深，提升对比 */
}
input[type="date"]:focus-visible {
  outline: 2px solid #5b8cff;
}
input[type="date"]::placeholder {
  color: #b0b6c1; /* 提升可读性 */
}

/* number 输入更清晰 */
input[type="number"] {
  background: #0a1426;
  border: 1px solid #2b3a55;
}

/* 移动端表单间距 */
@media (max-width: 720px) {
  .form-grid { gap: 14px; }
}
.result, .now-inline {
  background: #0d1a33; /* 突出结果背景 */
  border: 1px solid #2b3a55;
  border-radius: 10px;
  padding: 12px 14px;
  margin-top: 10px;
  color: var(--text);
  box-shadow: 0 2px 10px rgba(0,0,0,0.25);
}
.result strong { color: #8ab4ff; }
.result, .now-inline {
  display: flex;
  justify-content: center;  /* 水平居中 */
  align-items: center;      /* 垂直居中（如果需要） */
}
/* 字体大小控件样式 */
/* 调整导航布局：左侧语言链接，右侧字体控件 */
nav { display: flex; align-items: center; gap: 8px; justify-content: flex-start; }
/* 竖排标签与按钮样式优化 */
.font-size-control { align-items: stretch; box-shadow: 0 6px 18px rgba(0,0,0,0.25); }
.font-size-control .label { text-orientation: upright; line-height: 1; letter-spacing: 2px; }
.font-size-control .fs-btns button { border: 1px solid #2b3a55; border-radius: 10px; }
.font-size-control .fs-btns button:hover { background: #334155; }
nav .links { display: inline-flex; align-items: center; gap: 8px; }
.font-size-control {
  display: flex; align-items: center; gap: 10px;
  margin: 10px 0; padding: 10px 12px;
  background: #0b1220; border: 1px solid var(--border); border-radius: 10px;
}
.font-size-control .label { color: var(--muted); font-weight: 600; }
.font-size-control .fs-btns { display: flex; gap: 8px; }
.font-size-control button {
  background: #1f2937; color: var(--text); border-radius: 8px; padding: 6px 10px; font-weight: 700;
}
.font-size-control button.active { background: var(--primary); color: #fff; }
.font-size-control { margin-left: auto; }
.font-size-control .fs-select select {
  background: #0b1220; color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 6px 10px; font-weight: 700;
}
.font-size-control .fs-select select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.2); }
.font-size-control .fs-btns { display: flex; gap: 8px; }
.font-size-control button {
  background: #1f2937; color: var(--text); border-radius: 8px; padding: 6px 10px; font-weight: 700;
}
.font-size-control button.active { background: var(--primary); color: #fff; }
.font-size-control { margin-left: auto; }
.font-size-control .fs-btns button { min-width: 40px; }

/* 适配增强：中小屏优化 */
@media (max-width: 960px) {
  header, main, footer { padding-left: 12px; padding-right: 12px; }
  .card { padding: 16px; }
}

@media (max-width: 720px) {
  nav { flex-wrap: wrap; row-gap: 8px; }
  nav .links { order: 1; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; white-space: nowrap; gap: 12px; }
  nav .divider { display: none; }
  .font-size-control { order: 2; width: 100%; margin-left: 0; justify-content: space-between; }
  .font-size-control .label { writing-mode: horizontal-tb; text-orientation: mixed; letter-spacing: 1px; }
}

@media (max-width: 480px) {
  h1 { font-size: clamp(1.25rem, 4vw + 0.75rem, 1.75rem); }
  .lead { font-size: 0.95rem; }
  .font-size-control { padding: 8px; gap: 8px; }
  .font-size-control .fs-select select { padding: 6px 8px; min-width: 84px; }
}
.result, .now-inline {
  background: #0d1a33; /* 突出结果背景 */
  border: 1px solid #2b3a55;
  border-radius: 10px;
  padding: 12px 14px;
  margin-top: 10px;
  color: var(--text);
  box-shadow: 0 2px 10px rgba(0,0,0,0.25);
}
.result strong { color: #8ab4ff; }
.result, .now-inline {
  display: flex;
  justify-content: center;  /* 水平居中 */
  align-items: center;      /* 垂直居中（如果需要） */
}
/* 字体大小控件样式 */
/* 调整导航布局：左侧语言链接，右侧字体控件 */
nav { display: flex; align-items: center; gap: 8px; justify-content: flex-start; }
/* 竖排标签与按钮样式优化 */
.font-size-control { align-items: stretch; box-shadow: 0 6px 18px rgba(0,0,0,0.25); }
.font-size-control .label { text-orientation: upright; line-height: 1; letter-spacing: 2px; }
.font-size-control .fs-btns button { border: 1px solid #2b3a55; border-radius: 10px; }
.font-size-control .fs-btns button:hover { background: #334155; }
nav .links { display: inline-flex; align-items: center; gap: 8px; }
.font-size-control {
  display: flex; align-items: center; gap: 10px;
  margin: 10px 0; padding: 10px 12px;
  background: #0b1220; border: 1px solid var(--border); border-radius: 10px;
}
.font-size-control .label { color: var(--muted); font-weight: 600; }
.font-size-control .fs-btns { display: flex; gap: 8px; }
.font-size-control button {
  background: #1f2937; color: var(--text); border-radius: 8px; padding: 6px 10px; font-weight: 700;
}
.font-size-control button.active { background: var(--primary); color: #fff; }
.font-size-control { margin-left: auto; }
.font-size-control .fs-select select {
  background: #0b1220; color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 6px 10px; font-weight: 700;
}
.font-size-control .fs-select select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.2); }
.font-size-control .fs-btns { display: flex; gap: 8px; }
.font-size-control button {
  background: #1f2937; color: var(--text); border-radius: 8px; padding: 6px 10px; font-weight: 700;
}
.font-size-control button.active { background: var(--primary); color: #fff; }
.font-size-control { margin-left: auto; }
.font-size-control .fs-btns button { min-width: 40px; }