:root {
  color-scheme: light;
  font-family: Inter, Geist, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  --bg: #fff;
  --surface: #fff;
  --text: #09090b;
  --muted: #52525b;
  --faint: #71717a;
  --border: #e4e4e7;
  --border-soft: #ededed;
  --button: #09090b;
  --button-text: #fff;
  --button-hover-overlay: rgb(255 255 255 / 10%);
  --hover-bg: rgb(9 9 11 / 6%);
  --shadow: 0 2px 8px rgb(0 0 0 / 6%);
  --page-max: 1180px;
  --page-gutter: clamp(16px, 4vw, 48px);
  --topbar-height: 74px;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #fff;
  --surface: #fff;
  --text: #09090b;
  --muted: #52525b;
  --faint: #71717a;
  --border: #e4e4e7;
  --border-soft: #ededed;
  --button: #09090b;
  --button-text: #fff;
  --button-hover-overlay: rgb(255 255 255 / 10%);
  --hover-bg: rgb(9 9 11 / 6%);
  --shadow: 0 2px 8px rgb(0 0 0 / 6%);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #09090b;
  --surface: #18181b;
  --text: #fafafa;
  --muted: #a1a1aa;
  --faint: #71717a;
  --border: rgb(255 255 255 / 10%);
  --border-soft: rgb(255 255 255 / 12%);
  --button: #f5f5f5;
  --button-text: #09090b;
  --button-hover-overlay: rgb(9 9 11 / 8%);
  --hover-bg: rgb(255 255 255 / 8%);
  --shadow: 0 16px 40px rgb(0 0 0 / 32%);
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  min-height: 100%;
  overflow-y: scroll;
  scrollbar-gutter: stable;
  background: var(--bg);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

button {
  appearance: none;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

a,
button {
  -webkit-tap-highlight-color: transparent;
}

.page-shell {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.header-inner {
  display: flex;
  width: min(100%, var(--page-max));
  height: var(--topbar-height);
  min-height: var(--topbar-height);
  align-items: center;
  gap: clamp(18px, 2.4vw, 38px);
  margin: 0 auto;
  padding: 10px var(--page-gutter);
}

.brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 22px;
  font-weight: 700;
}

.brand-mark {
  display: inline-grid;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  background: #050505;
  color: #fff;
  font-size: 13px;
  font-weight: 780;
  line-height: 1;
}

.brand span:last-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-right {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  gap: clamp(18px, 2.4vw, 38px);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.6vw, 24px);
  margin-right: auto;
}

.main-nav a {
  position: relative;
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 0 8px 6px;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease;
}

.main-nav a:hover {
  background: var(--hover-bg);
}

.main-nav a.is-active::after {
  position: absolute;
  right: 50%;
  bottom: 3px;
  width: 58%;
  height: 2.5px;
  border-radius: 999px;
  background: var(--text);
  content: "";
  transform: translateX(50%);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.language-switcher,
.theme-switcher {
  position: relative;
  display: inline-flex;
}

.icon-btn {
  display: inline-flex;
  flex: 0 0 42px;
  width: 42px;
  min-width: 42px;
  height: 42px;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  padding: 0;
  transition: background 0.2s ease, color 0.2s ease;
}

.icon-btn:hover {
  background: var(--hover-bg);
}

.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.language-menu,
.theme-menu {
  position: absolute;
  z-index: 120;
  top: calc(100% + 28px);
  right: 0;
  display: grid;
  width: max-content;
  min-width: 156px;
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 8px;
  box-shadow: 0 10px 26px rgb(0 0 0 / 14%);
}

.language-menu {
  min-width: 148px;
}

.language-menu[hidden],
.theme-menu[hidden] {
  display: none;
}

.language-option,
.theme-option {
  display: flex;
  width: 100%;
  min-height: 38px;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  padding: 0 10px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.15;
  text-align: left;
  white-space: nowrap;
}

.language-option:hover,
.theme-option:hover {
  background: var(--hover-bg);
}

.language-option .check-icon,
.theme-option .check-icon {
  width: 16px;
  height: 16px;
  opacity: 0;
}

.language-option.is-active .check-icon,
.theme-option.is-active .check-icon {
  opacity: 1;
}

.main {
  min-height: calc(100vh - var(--topbar-height));
}

.container {
  width: min(100%, var(--page-max));
  margin: 0 auto;
  padding: 40px var(--page-gutter) 0;
}

.page-title {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: 28px;
  padding: 16px 0 30px;
}

.page-title > div {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.page-title h1 {
  margin: 0 0 14px;
  color: var(--text);
  font-size: clamp(38px, 5vw, 74px);
  font-weight: 780;
  line-height: 1.02;
}

.page-title p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.65;
}

.card,
.info-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}

.tool-area {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 22px clamp(18px, 2vw, 28px);
  align-items: start;
}

.tool-main,
.side-panel {
  min-width: 0;
}

.tool-card {
  display: grid;
  min-width: 0;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tool-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  padding: 18px;
}

.tool-card-head h2 {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.15;
}

.tool-card-head p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.status-pill {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0 10px;
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
}

.proxy-form {
  display: grid;
  gap: 18px;
  padding: 18px;
}

.form-group {
  display: grid;
  gap: 10px;
  min-width: 0;
}

label,
.field-label-row label {
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

.field-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.field-label-row span {
  color: var(--faint);
  font-size: 13px;
}

input[type="url"] {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: 0;
  background: var(--surface);
  color: var(--text);
  padding: 0 13px;
  font-size: 16px;
  transition: border-color 0.2s ease, background 0.2s ease;
}

input[type="url"]:-webkit-autofill,
input[type="url"]:-webkit-autofill:hover,
input[type="url"]:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--text);
  box-shadow: 0 0 0 1000px var(--surface) inset;
  transition: background-color 9999s ease-in-out 0s;
}

input[type="url"]::placeholder {
  color: var(--faint);
}

input[type="url"]:focus {
  border-color: var(--text);
}

.proxy-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.proxy-option {
  display: grid;
  min-width: 0;
  min-height: 112px;
  align-content: start;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 14px;
  text-align: left;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.proxy-option:hover {
  border-color: var(--faint);
  background: var(--surface);
}

.proxy-option.active {
  border-color: var(--text);
  box-shadow: inset 0 0 0 1px var(--text);
}

.proxy-option:active {
  transform: translateY(1px);
}

.option-title {
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.3;
}

.option-desc {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.button-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  padding: 0 18px;
  font-weight: 700;
  white-space: nowrap;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn-primary {
  min-height: 52px;
  border-color: transparent;
  background: var(--button);
  color: var(--button-text);
  font-size: 16px;
}

.btn-primary:hover {
  box-shadow: inset 0 0 0 999px var(--button-hover-overlay);
}

.btn-outline:hover {
  background: var(--hover-bg);
}

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

.error {
  display: none;
  margin: 0 18px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.55;
}

.result {
  display: grid;
  gap: 8px;
  min-height: 88px;
  align-content: center;
  margin: 0 18px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 14px;
}

.result p {
  margin: 0;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.result a {
  overflow-wrap: anywhere;
  color: var(--text);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, ui-monospace, monospace;
  font-size: 14px;
  line-height: 1.5;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.result.is-empty a {
  color: var(--muted);
  font-family: inherit;
  text-decoration: none;
  pointer-events: none;
}

.side-panel {
  display: grid;
  align-content: start;
  gap: 14px;
}

.info-card {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.info-card h2,
.info-card h3 {
  margin: 0;
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.25;
}

.info-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.metric-card {
  display: grid;
  gap: 5px;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

.metric-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

.metric-card strong {
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.1;
}

.site-footer {
  margin-top: 68px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  width: min(100%, var(--page-max));
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  padding: 28px var(--page-gutter);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 900px) {
  .page-title,
  .tool-area {
    grid-template-columns: 1fr;
  }

  .side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 901px) {
  :root {
    --topbar-height: 62px;
    --page-gutter: clamp(18px, 3vw, 36px);
  }

  body {
    line-height: 1.45;
  }

  .header-inner {
    gap: clamp(16px, 2vw, 30px);
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .brand {
    gap: 9px;
    font-size: 20px;
  }

  .header-right {
    gap: clamp(16px, 2vw, 30px);
  }

  .main-nav {
    gap: clamp(10px, 1.4vw, 20px);
  }

  .main-nav a {
    min-height: 34px;
    padding: 0 8px 5px;
    font-size: 14px;
  }

  .main {
    min-height: auto;
  }

  .container {
    padding-top: 12px;
  }

  .page-title {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    gap: 14px;
    padding: 4px 0 14px;
  }

  .eyebrow {
    margin-bottom: 4px;
    font-size: 13px;
  }

  .page-title h1 {
    margin-bottom: 8px;
    font-size: clamp(32px, 3.6vw, 50px);
    line-height: 1.02;
  }

  .page-title p {
    max-width: 760px;
    font-size: clamp(15px, 1.1vw, 17px);
    line-height: 1.45;
  }

  .tool-area {
    grid-template-columns: minmax(0, 1fr) minmax(250px, 300px);
    gap: 16px;
  }

  .tool-card-head {
    gap: 14px;
    padding: 12px 16px;
  }

  .tool-card-head h2 {
    margin-bottom: 4px;
    font-size: 20px;
  }

  .tool-card-head p {
    font-size: 13px;
    line-height: 1.45;
  }

  .status-pill {
    min-height: 26px;
    padding: 0 9px;
    font-size: 11px;
  }

  .proxy-form {
    gap: 10px;
    padding: 12px 16px;
  }

  .form-group {
    gap: 8px;
  }

  label,
  .field-label-row label {
    font-size: 13px;
  }

  .field-label-row span {
    font-size: 12px;
  }

  input[type="url"] {
    min-height: 44px;
    font-size: 15px;
  }

  .proxy-options {
    gap: 8px;
  }

  .proxy-option {
    min-height: 80px;
    gap: 6px;
    padding: 12px;
  }

  .option-title {
    font-size: 14px;
  }

  .option-desc {
    font-size: 12px;
    line-height: 1.45;
  }

  .button-group {
    gap: 10px;
  }

  .btn {
    min-height: 42px;
    padding: 0 16px;
  }

  .btn-primary {
    min-height: 44px;
    font-size: 15px;
  }

  .error {
    margin: 0 16px 14px;
    padding: 10px 12px;
    font-size: 13px;
  }

  .result {
    gap: 6px;
    min-height: 76px;
    margin: 0 16px 14px;
    padding: 10px 12px;
  }

  .result p,
  .result a {
    font-size: 13px;
  }

  .side-panel {
    gap: 12px;
  }

  .info-card {
    gap: 10px;
    padding: 14px;
  }

  .info-card h2,
  .info-card h3 {
    font-size: 16px;
  }

  .info-card p {
    font-size: 13px;
    line-height: 1.5;
  }

  .metric-card {
    gap: 4px;
    padding: 10px;
  }

  .metric-card strong {
    font-size: 16px;
  }

  .site-footer {
    margin-top: 18px;
  }

  .footer-inner {
    padding-top: 12px;
    padding-bottom: 12px;
    font-size: 13px;
  }
}

@media (max-width: 700px) {
  .header-inner {
    height: auto;
    min-height: var(--topbar-height);
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding: 12px 16px;
  }

  .brand {
    width: 100%;
    font-size: 20px;
  }

  .main-nav {
    width: auto;
    min-width: 0;
    flex: 1 1 auto;
    justify-content: flex-start;
    margin-left: 0;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .header-right {
    width: 100%;
    gap: 8px;
    margin-left: 0;
  }

  .header-actions {
    margin-left: auto;
  }

  .container {
    padding: 28px 16px 0;
  }

  .page-title {
    padding-bottom: 26px;
  }

  .page-title h1 {
    font-size: 38px;
  }

  .tool-card-head,
  .field-label-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .proxy-options,
  .button-group,
  .side-panel,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .btn,
  .btn-primary {
    width: 100%;
  }
}

@media (max-width: 420px) {
  .brand span:last-child {
    font-size: 18px;
  }

  .page-title h1 {
    font-size: 32px;
  }

  .tool-card-head,
  .proxy-form,
  .info-card {
    padding: 14px;
  }

  .error,
  .result {
    margin-right: 14px;
    margin-left: 14px;
  }
}