/* ============================================================
   信息助手 —— 样式
   不引用任何外部资源（无 CDN、无网络字体、无统计脚本）：
   一是保证离线可用，二是避免任何形式的第三方请求。
   所有装饰都用 CSS 渐变、伪元素和内联 SVG 完成。
   ============================================================ */

:root {
  --brand: #4f46e5;
  --brand-2: #7c3aed;
  --brand-dark: #4338ca;
  --brand-soft: #eef2ff;
  --text-1: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --line: #e5e7eb;
  --card: #ffffff;
  --ok: #16a34a;
  --radius: 16px;
  --shadow-sm: 0 1px 2px rgb(16 24 40 / 4%);
  --shadow-md: 0 1px 2px rgb(16 24 40 / 4%), 0 10px 28px -14px rgb(16 24 40 / 14%);
  --shadow-brand: 0 10px 24px -12px rgb(79 70 229 / 45%);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  padding: 0;
  color: var(--text-1);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* 用两层柔和的光斑代替纯色底，页面不再是一块死平的白 */
  background:
    radial-gradient(900px 420px at 12% -8%, #eef2ff 0%, transparent 62%),
    radial-gradient(760px 380px at 92% 2%, #f5f3ff 0%, transparent 60%),
    #f6f7fb;
  background-attachment: fixed;
}

.wrap {
  width: 100%;
  max-width: 1020px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ==================== 顶部：渐变横幅 ==================== */
.site-header {
  position: relative;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(135deg, #4f46e5 0%, #6d28d9 55%, #7c3aed 100%);
}

/* 两团柔光，纯 CSS，不用图片 */
.site-header::before,
.site-header::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgb(255 255 255 / 22%), transparent 70%);
}

.site-header::before { width: 340px; height: 340px; top: -170px; right: -70px; }
.site-header::after { width: 220px; height: 220px; bottom: -140px; left: -50px; }

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 26px;
  padding-bottom: 26px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 600;
  color: #fff;
  background: rgb(255 255 255 / 18%);
  border: 1px solid rgb(255 255 255 / 35%);
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 30%), 0 8px 20px -10px rgb(0 0 0 / 45%);
}

.brand-text h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .01em;
}

.brand-text p {
  margin: 3px 0 0;
  font-size: 12.5px;
  color: rgb(255 255 255 / 78%);
}

.privacy-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: #fff;
  background: rgb(255 255 255 / 16%);
  border: 1px solid rgb(255 255 255 / 28%);
  border-radius: 999px;
  padding: 6px 14px;
  white-space: nowrap;
}

.privacy-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #6ee7a8;
  box-shadow: 0 0 0 3px rgb(110 231 168 / 25%);
}

/* ==================== 标签页：吸顶胶囊条 ==================== */
.tabs {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgb(255 255 255 / 88%);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.tabs-inner {
  display: flex;
  gap: 6px;
  padding-top: 10px;
  padding-bottom: 10px;
  overflow-x: auto;
}

.tab {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  background: transparent;
  padding: 8px 16px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text-2);
  cursor: pointer;
  border-radius: 999px;
  white-space: nowrap;
  transition: background-color .18s, color .18s, box-shadow .18s;
}

.tab svg { width: 17px; height: 17px; opacity: .85; }

.tab:hover { color: var(--brand); background: var(--brand-soft); }

.tab.is-active {
  color: #fff;
  font-weight: 500;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  box-shadow: var(--shadow-brand);
}

.tab.is-active svg { opacity: 1; }

/* ==================== 内容区 ==================== */
.main {
  padding-top: 22px;
  padding-bottom: 40px;
}

.panel { display: none; }
.panel.is-active { display: block; animation: fade-up .22s ease both; }

@keyframes fade-up {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 20px 22px;
  margin-bottom: 18px;
  transition: box-shadow .22s, transform .22s;
}

.card:hover {
  box-shadow: 0 2px 4px rgb(16 24 40 / 5%), 0 18px 36px -20px rgb(79 70 229 / 26%);
}

.card-head {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.card-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  box-shadow: 0 8px 18px -10px rgb(79 70 229 / 70%);
}

.card-icon svg { width: 20px; height: 20px; }

/* 四个工具各用一种色调，页面不至于一片紫 */
.card-icon.tone-teal   { background: linear-gradient(135deg, #0d9488, #14b8a6); box-shadow: 0 8px 18px -10px rgb(13 148 136 / 70%); }
.card-icon.tone-amber  { background: linear-gradient(135deg, #d97706, #f59e0b); box-shadow: 0 8px 18px -10px rgb(217 119 6 / 70%); }
.card-icon.tone-rose   { background: linear-gradient(135deg, #e11d48, #f43f5e); box-shadow: 0 8px 18px -10px rgb(225 29 72 / 70%); }

.card-head-text { min-width: 0; }

.card-head-text h2 {
  margin: 0 0 3px;
  font-size: 16.5px;
  font-weight: 600;
}

.hint {
  margin: 0 0 14px;
  font-size: 12.5px;
  color: var(--text-3);
}

.card-head-text .hint { margin: 0; }

/* ==================== 通用控件 ==================== */
input[type="text"],
input[type="number"],
input[type="date"],
select,
textarea {
  font-family: inherit;
  font-size: 14px;
  color: var(--text-1);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 11px;
  outline: none;
  transition: border-color .18s, box-shadow .18s;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgb(79 70 229 / 13%);
}

textarea {
  width: 100%;
  resize: vertical;
  line-height: 1.75;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text-2);
}

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  border: 0;
  border-radius: 10px;
  padding: 9px 18px;
  cursor: pointer;
  box-shadow: 0 6px 16px -10px rgb(79 70 229 / 80%);
  transition: transform .15s, box-shadow .18s, background-color .18s, border-color .18s, color .18s;
}

.btn:hover { transform: translateY(-1px); box-shadow: 0 10px 22px -10px rgb(79 70 229 / 75%); }
.btn:active { transform: none; }

.btn.ghost {
  color: var(--text-2);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: none;
}

.btn.ghost:hover {
  color: var(--brand);
  border-color: #c7d2fe;
  background: var(--brand-soft);
  box-shadow: 0 6px 14px -10px rgb(79 70 229 / 60%);
}

.btn.small { padding: 5px 12px; font-size: 12.5px; }

.row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.row > label { flex: 1; min-width: 150px; }
.row input { width: 100%; }

.empty {
  color: var(--text-3);
  font-size: 13px;
  margin: 16px 0 0;
  text-align: center;
}

/* ==================== 图片压缩 ==================== */
.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 34px 16px;
  border: 2px dashed #c7d2fe;
  border-radius: 14px;
  background: linear-gradient(180deg, #fafbff, #eef2ff);
  cursor: pointer;
  text-align: center;
  transition: border-color .2s, background .2s, transform .2s;
}

.dropzone:hover,
.dropzone.is-over {
  border-color: var(--brand);
  background: linear-gradient(180deg, #eef2ff, #e0e7ff);
  transform: translateY(-1px);
}

.drop-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand);
  background: #fff;
  box-shadow: 0 10px 20px -12px rgb(79 70 229 / 85%);
  margin-bottom: 9px;
}

.drop-icon svg { width: 24px; height: 24px; }

.dropzone strong { font-size: 14.5px; color: var(--text-1); }
.dropzone span:not(.drop-icon) { font-size: 12.5px; color: var(--text-3); }

.options {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin: 18px 0 4px;
  padding: 14px 16px;
  background: #fafbff;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.options .val { color: var(--brand); font-weight: 600; }
.options input[type="range"] { width: 132px; accent-color: var(--brand); }

.results { margin-top: 16px; }

.result-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-bottom: 10px;
  transition: border-color .18s, background-color .18s;
}

.result-item:hover { border-color: #c7d2fe; background: #fafbff; }

.result-item img {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 10px;
  flex-shrink: 0;
  background: #f1f5f9;
  border: 1px solid var(--line);
}

.result-meta { flex: 1; min-width: 0; }

.result-name {
  font-size: 13.5px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.result-size { font-size: 12.5px; color: var(--text-3); margin-top: 3px; }
.result-size b { color: var(--text-1); }
.result-size .save { color: var(--ok); font-weight: 600; }
.result-size .bigger { color: #d97706; }

.actions { margin-top: 16px; }

/* ==================== 单位换算 ==================== */
.uc-cats {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.uc-cat {
  appearance: none;
  font-family: inherit;
  font-size: 13px;
  color: var(--text-2);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 15px;
  cursor: pointer;
  transition: all .18s;
}

.uc-cat:hover { color: var(--brand); border-color: #c7d2fe; background: var(--brand-soft); }

.uc-cat.is-active {
  color: #fff;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  border-color: transparent;
  box-shadow: var(--shadow-brand);
}

.uc-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.uc-side {
  display: flex;
  gap: 8px;
  flex: 1;
  min-width: 250px;
}

.uc-side input { width: 140px; font-size: 15px; }
.uc-side input[readonly] { background: #fafbff; color: var(--brand); font-weight: 600; }
.uc-side select { flex: 1; min-width: 0; }
.swap { padding: 8px 14px; font-size: 16px; }

.unit-formula {
  margin: 14px 0 0;
  padding: 10px 14px;
  background: var(--brand-soft);
  border-radius: 10px;
  color: var(--brand);
  font-size: 13px;
  min-height: 40px;
}

/* ==================== 日期 ==================== */
.stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.stat {
  flex: 1;
  min-width: 118px;
  background: linear-gradient(180deg, #fafbff, #eef2ff);
  border: 1px solid #e6e9f8;
  border-radius: 12px;
  padding: 12px 16px;
}

.stat .k { font-size: 12px; color: var(--text-2); }
.stat .v { font-size: 20px; font-weight: 600; color: var(--brand); line-height: 1.35; }
.stat .v small { font-size: 12px; font-weight: 400; color: var(--text-2); }

/* ==================== 文本 ==================== */
.counts {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--text-2);
  margin: 12px 0 16px;
}

.counts span {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 13px;
}

.counts b { color: var(--text-1); font-size: 13px; }

.text-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.btn.chip { padding: 6px 14px; font-size: 12.5px; border-radius: 999px; }

.text-output .out-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--text-2);
  margin-bottom: 7px;
}

/* ==================== 页脚 ==================== */
.site-footer {
  position: relative;
  background: var(--card);
  border-top: 1px solid var(--line);
  padding: 26px 0 34px;
  font-size: 12.5px;
  color: var(--text-3);
  text-align: center;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #4f46e5, #7c3aed, #0d9488, #f59e0b, #e11d48);
  opacity: .75;
}

.site-footer p { margin: 5px 0; }

.foot-links {
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 12px !important;
}

.site-footer a {
  color: var(--text-2);
  text-decoration: none;
  transition: color .18s;
}

.site-footer a:hover { color: var(--brand); }

.beian a { color: var(--text-3); }

/* ==================== 窄屏 ==================== */
@media (max-width: 640px) {
  .header-inner { padding-top: 18px; padding-bottom: 18px; gap: 12px; }
  .brand-mark { width: 42px; height: 42px; font-size: 21px; border-radius: 12px; }
  .brand-text h1 { font-size: 19px; }
  .privacy-badge { font-size: 11.5px; padding: 5px 12px; }
  .card { padding: 16px; }
  .card-icon { width: 36px; height: 36px; border-radius: 10px; }
  .uc-side { min-width: 100%; }
  .uc-side input { width: 110px; }
  .result-item { flex-wrap: wrap; }
  .stat { min-width: 96px; padding: 10px 13px; }
  .stat .v { font-size: 18px; }
  .row > label { min-width: 100%; }
}