:root {
  --accent: #0cc685;
  --accent-dim: rgba(12, 198, 133, 0.3);
  --bg: #1a1a1a;
  --card: #2a2a2a;
  --text: #e0e0e0;
  --text-muted: #b0b0b0;
  --text-dim: #666;
  --page-pad: 12px;
  --card-pad: 20px 16px;
  --card-max: 100%;
  --title-size: 17px;
  --h2-size: 15px;
  --h3-size: 14px;
  --body-size: 14px;
  --radius: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: var(--body-size);
  line-height: 1.8;
  color: var(--text);
  background-color: var(--bg);
  padding: var(--page-pad);
  padding-bottom: calc(var(--page-pad) + env(safe-area-inset-bottom, 0px));
  min-height: 100vh;
  min-height: 100dvh;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.agreement-container {
  width: 100%;
  max-width: var(--card-max);
  margin: 0 auto;
  background: var(--card);
  border-radius: var(--radius);
  padding: var(--card-pad);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  position: relative;
}

.lang-switch {
  display: flex;
  justify-content: flex-end;
  gap: 0;
  margin-bottom: 16px;
  border: 1px solid var(--accent-dim);
  border-radius: 20px;
  overflow: hidden;
  width: fit-content;
  margin-left: auto;
  background: rgba(0, 0, 0, 0.25);
}

.lang-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-size: 13px;
  font-family: inherit;
  padding: 6px 14px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  line-height: 1.4;
}

.lang-switch button.active {
  background: var(--accent);
  color: #04261a;
  font-weight: 600;
}

.lang-switch button:not(.active):hover {
  color: var(--accent);
  background: rgba(12, 198, 133, 0.08);
}

.lang-panel[hidden] {
  display: none !important;
}

@media screen and (min-width: 768px) {
  .lang-switch {
    margin-bottom: 20px;
  }

  .lang-switch button {
    font-size: 14px;
    padding: 7px 18px;
  }
}

h1 {
  font-size: var(--title-size);
  font-weight: 600;
  color: var(--accent);
  text-align: center;
  margin-bottom: 10px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--accent-dim);
  line-height: 1.4;
}

.last-update {
  font-size: 12px;
  color: var(--text-dim);
  text-align: center;
  margin-bottom: 20px;
}

.notice {
  font-size: var(--body-size);
  color: var(--text-muted);
  line-height: 1.9;
  text-align: justify;
  margin-bottom: 20px;
  padding: 12px 14px;
  background: rgba(12, 198, 133, 0.08);
  border-radius: 8px;
  border: 1px solid var(--accent-dim);
}

.notice p + p {
  margin-top: 8px;
}

section {
  margin-bottom: 20px;
  padding-left: 10px;
  border-left: 3px solid var(--accent);
}

h2 {
  font-size: var(--h2-size);
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 10px;
  line-height: 1.5;
}

h3 {
  font-size: var(--h3-size);
  font-weight: 600;
  color: #d0d0d0;
  margin: 12px 0 8px;
  line-height: 1.5;
}

p,
li {
  font-size: var(--body-size);
  color: var(--text-muted);
  line-height: 1.9;
  text-align: justify;
}

p + p {
  margin-top: 8px;
}

ol,
ul {
  padding-left: 1.25em;
}

ol ol,
ul ul,
ol ul,
ul ol {
  margin-top: 8px;
  padding-left: 1.1em;
}

li {
  margin-bottom: 8px;
}

li > p {
  margin-top: 6px;
}

strong {
  color: var(--text);
  font-weight: 600;
}

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

a:hover {
  text-decoration: underline;
}

.footer {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--accent-dim);
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
}

.footer p {
  margin-bottom: 8px;
  text-align: center;
}

.price-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 18px;
  font-size: var(--body-size);
}

.price-table th,
.price-table td {
  border: 1px solid var(--accent-dim);
  padding: 8px 10px;
  text-align: left;
  color: var(--text-muted);
  vertical-align: top;
}

.price-table th {
  background: rgba(12, 198, 133, 0.12);
  color: var(--accent);
  font-weight: 600;
}

.sdk-card {
  margin-bottom: 16px;
  padding: 12px 14px;
  border: 1px solid var(--accent-dim);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
}

.sdk-card h3 {
  margin-top: 0;
}

.sdk-card p {
  margin-top: 4px;
}

.toc {
  margin-bottom: 20px;
  padding: 12px 14px;
  background: rgba(12, 198, 133, 0.08);
  border-radius: 8px;
  border: 1px solid var(--accent-dim);
}

.toc ol {
  margin: 0;
}

/* 小屏手机 */
@media screen and (max-width: 375px) {
  :root {
    --page-pad: 8px;
    --card-pad: 16px 12px;
    --title-size: 16px;
    --h2-size: 14px;
    --h3-size: 13px;
    --body-size: 13px;
    --radius: 10px;
  }

  section {
    padding-left: 8px;
  }

  ol,
  ul {
    padding-left: 1.1em;
  }
}

/* 大屏手机 / 小平板 */
@media screen and (min-width: 480px) {
  :root {
    --page-pad: 16px;
    --card-pad: 28px 24px;
    --card-max: 560px;
    --title-size: 18px;
    --h2-size: 15px;
    --body-size: 14px;
  }
}

/* 平板 */
@media screen and (min-width: 768px) {
  :root {
    --page-pad: 32px 24px;
    --card-pad: 36px 40px;
    --card-max: 720px;
    --title-size: 22px;
    --h2-size: 17px;
    --h3-size: 15px;
    --body-size: 15px;
    --radius: 14px;
  }

  .last-update {
    font-size: 13px;
    margin-bottom: 28px;
  }

  .notice {
    padding: 16px 18px;
    margin-bottom: 28px;
  }

  section {
    margin-bottom: 28px;
    padding-left: 14px;
  }

  .footer {
    margin-top: 36px;
    padding-top: 24px;
    font-size: 13px;
  }
}

/* PC 桌面 */
@media screen and (min-width: 1024px) {
  :root {
    --page-pad: 48px 24px 64px;
    --card-pad: 48px 56px;
    --card-max: 880px;
    --title-size: 24px;
    --h2-size: 18px;
    --h3-size: 16px;
    --body-size: 15px;
    --radius: 16px;
  }

  body {
    line-height: 1.85;
  }

  .agreement-container {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  }

  h1 {
    padding-bottom: 20px;
    margin-bottom: 12px;
  }

  .last-update {
    font-size: 14px;
    margin-bottom: 32px;
  }

  .notice {
    padding: 18px 22px;
    font-size: 15px;
  }

  section {
    margin-bottom: 32px;
    padding-left: 16px;
    border-left-width: 4px;
  }

  ol,
  ul {
    padding-left: 1.5em;
  }

  a:hover {
    opacity: 0.9;
  }
}

/* 宽屏 PC */
@media screen and (min-width: 1440px) {
  :root {
    --card-max: 960px;
    --card-pad: 56px 64px;
  }
}