:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --fg: #14161a;
  --fg-soft: #5b6270;
  --fg-faint: #8b93a1;
  --line: #e6e8ec;
  --accent: #1f5eff;
  --accent-soft: #eef3ff;
  --radius: 14px;
  --maxw: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #161a20;
    --fg: #eceef2;
    --fg-soft: #a2aab8;
    --fg-faint: #6f7787;
    --line: #262b33;
    --accent: #6f96ff;
    --accent-soft: #16203a;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC",
        "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ---------- 顶栏 ---------- */

header.site {
  border-bottom: 1px solid var(--line);
}

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

.brand {
  font-weight: 600;
  font-size: 15px;
  color: var(--fg);
  letter-spacing: -0.01em;
}

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

nav.top {
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav.top a {
  color: var(--fg-soft);
  font-size: 14px;
  white-space: nowrap;
}

@media (max-width: 520px) {
  nav.top { gap: 14px; }
  nav.top a { font-size: 13px; }
}

/* ---------- 首屏 ---------- */

.hero {
  padding: 96px 0 72px;
}

.hero h1 {
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  font-weight: 650;
}

.hero p.lead {
  font-size: 18px;
  color: var(--fg-soft);
  margin: 0 0 32px;
  max-width: 34em;
}

.eyebrow {
  font-size: 13px;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
  margin: 0 0 14px;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity .15s ease;
}

.btn:hover { text-decoration: none; opacity: .88; }

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-ghost {
  border-color: var(--line);
  color: var(--fg);
  background: transparent;
}

.btn[aria-disabled="true"] {
  opacity: .45;
  pointer-events: none;
}

/* ---------- 产品卡 ---------- */

.products {
  padding: 8px 0 96px;
}

.product {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-soft);
  transition: border-color .15s ease;
}

.product:hover { border-color: var(--fg-faint); }

.product .icon {
  width: 56px;
  height: 56px;
  border-radius: 13px;
  flex: none;
  background: linear-gradient(160deg, #203a78, #12606f);
  display: grid;
  place-items: center;
}

.product .icon svg { display: block; }

.product h3 {
  color: var(--fg);
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
}

.product p {
  margin: 0 0 10px;
  color: var(--fg-soft);
  font-size: 14.5px;
}

.product .meta {
  font-size: 13px;
  color: var(--fg-faint);
}

/* ---------- 通用区块 ---------- */

section { padding: 56px 0; }

h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  font-weight: 620;
}

h3.sub {
  font-size: 16px;
  margin: 32px 0 8px;
  font-weight: 600;
}

p { margin: 0 0 14px; }

ul { margin: 0 0 16px; padding-left: 20px; color: var(--fg-soft); }
li { margin-bottom: 6px; }

.muted { color: var(--fg-soft); }
.faint { color: var(--fg-faint); font-size: 13.5px; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}

/* ---------- 截图 ---------- */

.shot {
  margin: 28px 0;
}

.shot img {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.shot figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--fg-faint);
  text-align: center;
}

/* ---------- 价格 ---------- */

.pricing {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 28px 0;
}

@media (max-width: 640px) {
  .pricing { grid-template-columns: 1fr; }
}

.plan {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.plan.featured {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.plan .name {
  font-size: 14px;
  color: var(--fg-soft);
  margin-bottom: 6px;
}

.plan .price {
  font-size: 30px;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin-bottom: 2px;
}

.plan .price small {
  font-size: 14px;
  font-weight: 400;
  color: var(--fg-soft);
  letter-spacing: 0;
}

.plan ul {
  margin: 16px 0 0;
  padding-left: 18px;
  font-size: 14px;
}

/* ---------- FAQ ---------- */

details {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}

summary {
  cursor: pointer;
  font-weight: 500;
  list-style: none;
}

summary::-webkit-details-marker { display: none; }

summary::before {
  content: "＋";
  color: var(--fg-faint);
  margin-right: 10px;
  font-size: 13px;
}

details[open] summary::before { content: "－"; }

details p {
  margin: 10px 0 0 24px;
  color: var(--fg-soft);
  font-size: 14.5px;
}

/* ---------- 页脚 ---------- */

footer.site {
  border-top: 1px solid var(--line);
  padding: 32px 0 56px;
  margin-top: 40px;
}

footer.site .wrap {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
  font-size: 13.5px;
  color: var(--fg-faint);
}

footer.site a { color: var(--fg-soft); }

/* ---------- 提示条 ---------- */

.notice {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--fg-soft);
  margin: 24px 0;
}

/* ---------- 暖色版：给「书」气质的产品页用（摘读） ---------- */

@media (prefers-color-scheme: light) {
  body.warm {
    --bg: #faf7f1;
    --bg-soft: #f3ece0;
    --fg: #26221f;
    --fg-soft: #5b544c;
    --fg-faint: #8a8072;
    --line: #e3dbcb;
    --accent: #2e3e4d;
    --accent-soft: #e8edf1;
  }
}

@media (prefers-color-scheme: dark) {
  body.warm {
    --bg: #171a1e;
    --bg-soft: #1f242a;
    --fg: #ece4d6;
    --fg-soft: #b3a998;
    --fg-faint: #857c6d;
    --line: #2e3841;
    --accent: #9fbcd6;
    --accent-soft: #22303c;
  }
}

body.warm h1,
body.warm h2,
body.warm h3.sub {
  font-family: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  letter-spacing: 0.01em;
}

/* ---------- 首页产品列表 ---------- */

.product-list {
  display: grid;
  gap: 16px;
}

.product .icon img {
  width: 100%;
  height: 100%;
  border-radius: 13px;
  display: block;
}

/* ---------- 工具清单 ---------- */

.toollist {
  border-top: 1px solid var(--line);
}

.tool {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
  color: inherit;
}

.tool:hover {
  text-decoration: none;
  background: var(--bg-soft);
}

.tool-main {
  flex: 1 1 auto;
  min-width: 0;
}

.tool h3 {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
}

.tool h3 .en {
  font-weight: 400;
  font-size: 13px;
  color: var(--fg-faint);
  margin-left: 6px;
}

.tool p {
  margin: 0;
  font-size: 14px;
  color: var(--fg-soft);
}

.tool-meta {
  display: flex;
  gap: 8px;
  flex: none;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.tag {
  font-size: 12px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--fg-soft);
  white-space: nowrap;
}

.tag.price {
  color: var(--fg);
  border-color: var(--fg-faint);
}

.tag.state {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: transparent;
}

.tool-wish {
  border-bottom: 1px dashed var(--line);
  opacity: .8;
}

.tool-wish h3 {
  font-weight: 500;
  color: var(--fg-soft);
}

@media (max-width: 560px) {
  .tool { flex-direction: column; align-items: flex-start; gap: 10px; }
  .tool-meta { justify-content: flex-start; }
}

/* ---------- 许愿表单 ---------- */

.wish-form {
  max-width: 560px;
  margin: 0 0 24px;
}

.wish-form label {
  display: block;
  margin-bottom: 22px;
}

.wish-form label > span {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 7px;
}

.wish-form label > em {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  font-style: normal;
  color: var(--fg-faint);
}

.wish-form textarea,
.wish-form input,
.wish-form select {
  width: 100%;
  font: inherit;
  font-size: 14.5px;
  color: var(--fg);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 10px 12px;
  resize: vertical;
}

.wish-form textarea:focus,
.wish-form input:focus,
.wish-form select:focus {
  outline: none;
  border-color: var(--accent);
}

.wish-form select {
  padding-right: 34px;
}

.wish-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ---------- 对比表 ---------- */

table.compare {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 10px;
  font-size: 14.5px;
}

table.compare th,
table.compare td {
  text-align: left;
  padding: 11px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

table.compare th {
  font-weight: 500;
  color: var(--fg-faint);
  font-size: 13px;
}

table.compare td:first-child {
  color: var(--fg-soft);
  width: 34%;
}

table.compare .yes { color: var(--fg); }
table.compare .no  { color: var(--fg-faint); }