:root {
  color-scheme: light dark;
  --page: #f3f6f3;
  --surface: #fbfdfb;
  --surface-raised: #ffffff;
  --surface-muted: #eef2ee;
  --text: #17221b;
  --text-secondary: #526158;
  --border: #cfd8d1;
  --border-strong: #aebbb1;
  --accent: #176448;
  --accent-hover: #104c36;
  --accent-contrast: #f7fff9;
  --danger: #a63d31;
  --warning-bg: #fff5d9;
  --warning-text: #674c00;
  --focus: #2c7d5d;
  --shadow: 0 18px 60px rgba(42, 72, 55, 0.11);
  --radius-card: 16px;
  --radius-control: 10px;
  --ease: 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
  font-family: "Avenir Next", Avenir, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #111713;
    --surface: #151d18;
    --surface-raised: #1b251f;
    --surface-muted: #202b24;
    --text: #edf6f0;
    --text-secondary: #a9b9ae;
    --border: #34443a;
    --border-strong: #4b6052;
    --accent: #59b88d;
    --accent-hover: #75caa3;
    --accent-contrast: #102018;
    --danger: #f18f83;
    --warning-bg: #3e3318;
    --warning-text: #f6d982;
    --focus: #7cd3ac;
    --shadow: 0 18px 60px rgba(0, 0, 0, 0.24);
  }
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--page);
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 10%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 28rem),
    var(--page);
  font-size: 16px;
  line-height: 1.6;
}

button,
input,
select {
  font: inherit;
}

button {
  touch-action: manipulation;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 10;
  transform: translateY(-160%);
  padding: 10px 14px;
  color: var(--accent-contrast);
  background: var(--accent);
  border-radius: var(--radius-control);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--page) 90%, transparent);
  backdrop-filter: blur(14px);
}

.header-inner {
  width: min(1180px, calc(100% - 40px));
  height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-inner p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 10px;
  color: var(--accent-contrast);
  background: var(--accent);
  font-size: 15px;
}

.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 96px;
}

.intro {
  max-width: 760px;
  margin-bottom: 44px;
}

.eyebrow,
.result-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.intro h1 {
  max-width: 650px;
  margin: 0;
  font-size: clamp(36px, 5vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.05em;
}

.intro > p:last-child {
  max-width: 640px;
  margin: 22px 0 0;
  color: var(--text-secondary);
  font-size: 18px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.85fr);
  gap: 28px;
  align-items: start;
}

.converter-form,
.result-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.converter-form {
  padding: 30px;
}

.result-panel {
  position: sticky;
  top: 28px;
  min-height: 520px;
  overflow: hidden;
}

.form-section + .form-section {
  margin-top: 42px;
  padding-top: 34px;
  border-top: 1px solid var(--border);
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 24px;
}

.section-heading > div {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.section-heading h2 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.025em;
}

.format-note {
  color: var(--text-secondary);
  font-size: 13px;
}

.field {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.field label {
  font-size: 14px;
  font-weight: 650;
}

.field label span {
  color: var(--danger);
}

input,
select {
  width: 100%;
  min-height: 48px;
  padding: 10px 13px;
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-control);
  outline: none;
  background: var(--surface-raised);
  transition: border-color var(--ease), box-shadow var(--ease), background-color var(--ease);
}

input::placeholder {
  color: color-mix(in srgb, var(--text-secondary) 85%, transparent);
}

input:hover,
select:hover {
  border-color: var(--text-secondary);
}

input:focus-visible,
select:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 35%, transparent);
  outline-offset: 2px;
}

input:invalid:not(:placeholder-shown) {
  border-color: var(--danger);
}

.field-help {
  margin: 0;
  color: var(--text-secondary);
  font-size: 13px;
}

code {
  padding: 1px 4px;
  border-radius: 5px;
  background: var(--surface-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.button {
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  cursor: pointer;
  font-weight: 700;
  white-space: nowrap;
  transition: background-color var(--ease), border-color var(--ease), color var(--ease), opacity var(--ease), transform var(--ease);
}

.button:active {
  transform: scale(0.98);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.button-primary {
  color: var(--accent-contrast);
  background: var(--accent);
}

.button-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.button-secondary {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface-raised);
}

.button-secondary:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.converter-form > .button-primary {
  width: 100%;
  min-height: 54px;
  margin-top: 24px;
}

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

.proxy-card {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: 24px 20px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--surface-muted);
}

.proxy-card legend {
  padding: 0 8px;
  font-size: 15px;
  font-weight: 750;
}

.remove-proxy {
  position: absolute;
  top: 12px;
  right: 14px;
  min-width: 52px;
  min-height: 40px;
  padding: 6px 8px;
  border: 0;
  color: var(--danger);
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.remove-proxy:hover {
  text-decoration: underline;
}

.proxy-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 16px;
}

.field-server {
  grid-column: span 3;
}

.field-port {
  grid-column: span 1;
}

.field-protocol {
  grid-column: span 2;
}

.field-username,
.password-field {
  grid-column: span 3;
}

.password-control {
  position: relative;
}

.password-control input {
  padding-right: 64px;
}

.password-toggle {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 52px;
  min-height: 40px;
  border: 0;
  border-radius: 8px;
  color: var(--accent);
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.advanced-section {
  margin-top: 28px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.advanced-section summary {
  min-height: 48px;
  padding: 12px 4px;
  cursor: pointer;
  color: var(--text-secondary);
  font-weight: 650;
}

.advanced-content {
  padding: 4px 0 20px;
}

.form-error {
  margin-top: 20px;
  padding: 12px 14px;
  border-left: 4px solid var(--danger);
  border-radius: 8px;
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  font-weight: 600;
}

.result-empty,
.result-success {
  padding: 34px;
}

.result-empty h2,
.result-success h2 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.result-empty > p:not(.result-kicker),
.success-heading p {
  margin: 12px 0 0;
  color: var(--text-secondary);
}

.flow-list {
  display: grid;
  gap: 0;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.flow-list li {
  position: relative;
  display: grid;
  gap: 1px;
  padding: 16px 0 16px 22px;
  border-bottom: 1px solid var(--border);
}

.flow-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 25px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.flow-list span {
  color: var(--text-secondary);
  font-size: 13px;
}

.flow-list b {
  font-size: 15px;
}

.success-heading {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}

.success-badge {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
  padding: 26px 0;
  border-bottom: 1px solid var(--border);
}

.metrics div {
  min-width: 0;
}

.metrics div + div {
  padding-left: 16px;
  border-left: 1px solid var(--border);
}

.metrics dt {
  color: var(--text-secondary);
  font-size: 12px;
}

.metrics dd {
  margin: 2px 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 25px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
}

.result-block,
.warning-block {
  padding-top: 24px;
}

.result-block h3,
.warning-block h3 {
  margin: 0 0 10px;
  font-size: 13px;
}

.result-block ul,
.warning-block ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.result-block li,
.main-group-value {
  overflow-wrap: anywhere;
  margin: 0;
  padding: 9px 11px;
  border-radius: 8px;
  background: var(--surface-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

.warning-block {
  margin-top: 22px;
  padding: 14px;
  border-radius: 10px;
  color: var(--warning-text);
  background: var(--warning-bg);
}

.warning-block li {
  font-size: 13px;
}

.result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 28px;
}

.action-feedback {
  min-height: 24px;
  margin: 8px 0 0;
  color: var(--accent);
  text-align: center;
  font-size: 13px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .result-panel {
    position: static;
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .header-inner,
  .page-shell {
    width: min(100% - 28px, 1180px);
  }

  .header-inner p {
    display: none;
  }

  .page-shell {
    padding: 44px 0 64px;
  }

  .intro {
    margin-bottom: 30px;
  }

  .intro h1 {
    font-size: clamp(34px, 11vw, 46px);
  }

  .intro > p:last-child {
    font-size: 16px;
  }

  .converter-form,
  .result-empty,
  .result-success {
    padding: 22px 18px;
  }

  .section-heading {
    align-items: flex-start;
  }

  .format-note {
    max-width: 140px;
    text-align: right;
  }

  .proxy-grid {
    grid-template-columns: 1fr 1fr;
  }

  .field-server,
  .field-username,
  .password-field,
  .proxy-grid .field:last-child {
    grid-column: 1 / -1;
  }

  .field-port,
  .field-protocol {
    grid-column: span 1;
  }
}

@media (max-width: 480px) {
  .section-heading {
    display: grid;
  }

  .section-heading .button {
    width: 100%;
  }

  .format-note {
    display: none;
  }

  .proxy-grid,
  .result-actions {
    grid-template-columns: 1fr;
  }

  .field-server,
  .field-username,
  .password-field,
  .proxy-grid .field:last-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}