:root {
  color-scheme: light dark;
  --canvas: #f6f5f4;
  --canvas-pure: #ffffff;
  --surface: #ffffff;
  --surface-muted: #f0efed;
  --ink: #111110;
  --ink-secondary: #31302e;
  --ink-muted: #615d59;
  --ink-faint: #928d87;
  --hairline: #e3e1df;
  --hairline-strong: #d3d0cd;
  --primary: #0075de;
  --primary-active: #005bab;
  --primary-soft: #e8f3fd;
  --secondary: #213183;
  --hero-ink: #ffffff;
  --success: #138a2c;
  --success-soft: #e9f7ec;
  --warning: #a14a00;
  --warning-soft: #fff1e6;
  --info-soft: #edf6ff;
  --shadow-soft: 0 0.175px 1.041px rgba(0, 0, 0, 0.01), 0 0.8px 2.925px rgba(0, 0, 0, 0.02), 0 2.025px 7.847px rgba(0, 0, 0, 0.027), 0 4px 18px rgba(0, 0, 0, 0.04);
  --font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --container: min(1180px, calc(100% - 48px));
}

html[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #191918;
  --canvas-pure: #121212;
  --surface: #242423;
  --surface-muted: #2b2b29;
  --ink: #f5f4f1;
  --ink-secondary: #dcdbd7;
  --ink-muted: #aaa6a0;
  --ink-faint: #817d77;
  --hairline: #393835;
  --hairline-strong: #4a4844;
  --primary: #62aef0;
  --primary-active: #8ac5f5;
  --primary-soft: #1d3347;
  --secondary: #182361;
  --hero-ink: #ffffff;
  --success: #66cd76;
  --success-soft: #1e3823;
  --warning: #ffad6b;
  --warning-soft: #422a18;
  --info-soft: #1c3043;
  --shadow-soft: 0 0 0 1px rgba(255, 255, 255, 0.03), 0 12px 32px rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    color-scheme: dark;
    --canvas: #191918;
    --canvas-pure: #121212;
    --surface: #242423;
    --surface-muted: #2b2b29;
    --ink: #f5f4f1;
    --ink-secondary: #dcdbd7;
    --ink-muted: #aaa6a0;
    --ink-faint: #817d77;
    --hairline: #393835;
    --hairline-strong: #4a4844;
    --primary: #62aef0;
    --primary-active: #8ac5f5;
    --primary-soft: #1d3347;
    --secondary: #182361;
    --hero-ink: #ffffff;
    --success: #66cd76;
    --success-soft: #1e3823;
    --warning: #ffad6b;
    --warning-soft: #422a18;
    --info-soft: #1c3043;
    --shadow-soft: 0 0 0 1px rgba(255, 255, 255, 0.03), 0 12px 32px rgba(0, 0, 0, 0.2);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  background: var(--canvas);
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--canvas);
  color: var(--ink-secondary);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

button {
  color: inherit;
  font: inherit;
}

code {
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.88em;
  overflow-wrap: anywhere;
}

::selection {
  background: var(--primary);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--hairline);
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: blur(18px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  width: var(--container);
  min-height: 68px;
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  aspect-ratio: 1;
  border-radius: 7px;
  background: var(--ink);
  color: var(--canvas);
  font-size: 15px;
  line-height: 1;
}

.brand-divider {
  width: 1px;
  height: 22px;
  margin-inline: 16px;
  background: var(--hairline-strong);
}

.page-name {
  color: var(--ink-muted);
  font-size: 14px;
  font-weight: 500;
}

.ai-help-trigger {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 38px;
  margin-left: auto;
  padding: 7px 13px;
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
  transition: background-color 160ms ease, transform 160ms ease;
}

.ai-help-trigger:hover {
  background: var(--primary-active);
  transform: translateY(-1px);
}

.ai-help-trigger > span:first-child {
  font-size: 15px;
  line-height: 1;
}

.theme-control {
  display: flex;
  gap: 3px;
  margin-left: 9px;
  padding: 3px;
  border: 1px solid var(--hairline);
  border-radius: 9px;
  background: var(--surface-muted);
}

.theme-control button {
  min-width: 54px;
  min-height: 32px;
  padding: 4px 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--ink-muted);
  font-size: 12px;
  cursor: pointer;
}

.theme-control button[aria-pressed="true"] {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-soft);
  font-weight: 600;
}

.dialog-open {
  overflow: hidden;
}

.ai-dialog {
  width: min(680px, calc(100% - 32px));
  max-height: min(820px, calc(100dvh - 32px));
  padding: 0;
  overflow: auto;
  border: 1px solid var(--hairline-strong);
  border-radius: 16px;
  background: var(--surface);
  color: var(--ink-secondary);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.24);
}

.ai-dialog::backdrop {
  background: rgba(13, 13, 18, 0.58);
  backdrop-filter: blur(5px);
}

.ai-dialog-inner {
  position: relative;
  padding: 36px;
}

.dialog-close {
  position: absolute;
  top: 18px;
  right: 18px;
  display: grid;
  place-items: center;
  width: 36px;
  aspect-ratio: 1;
  padding: 0;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  background: var(--surface-muted);
  color: var(--ink-muted);
  font-size: 23px;
  line-height: 1;
  cursor: pointer;
}

.dialog-close:hover {
  color: var(--ink);
}

.dialog-kicker {
  display: block;
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ai-dialog h2 {
  max-width: 540px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(29px, 5vw, 38px);
  font-weight: 740;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.ai-dialog h2 + p {
  max-width: 560px;
  margin: 17px 0 0;
  color: var(--ink-muted);
  font-size: 14px;
}

.ai-prompt {
  margin-top: 26px;
  padding: 20px;
  border: 1px solid var(--hairline-strong);
  border-radius: 10px;
  background: var(--canvas);
  color: var(--ink-secondary);
  font-size: 14px;
  line-height: 1.72;
  white-space: pre-wrap;
  user-select: text;
}

.ai-safety-note {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 11px;
  align-items: start;
  margin-top: 14px;
  padding: 14px;
  border-radius: 9px;
  background: var(--warning-soft);
}

.ai-safety-note > span {
  display: grid;
  place-items: center;
  width: 26px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--warning);
  color: var(--surface);
  font-size: 12px;
  font-weight: 800;
}

.ai-safety-note p {
  margin: 1px 0 0;
  color: var(--ink-muted);
  font-size: 12px;
  line-height: 1.55;
}

.ai-safety-note strong {
  color: var(--ink);
}

.dialog-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
}

.copy-prompt {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 46px;
  padding: 10px 18px;
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
  transition: background-color 160ms ease, transform 160ms ease;
}

.copy-prompt:hover {
  background: var(--primary-active);
  transform: translateY(-1px);
}

.copy-prompt.is-copied {
  background: var(--success);
}

.copy-icon {
  font-size: 16px;
  line-height: 1;
}

.copy-status {
  color: var(--success);
  font-size: 12px;
  font-weight: 600;
}

.hero {
  position: relative;
  overflow: hidden;
  background: var(--secondary);
  color: var(--hero-ink);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.13;
  background-image: radial-gradient(rgba(255, 255, 255, 0.7) 0.7px, transparent 0.7px);
  background-size: 26px 26px;
  mask-image: linear-gradient(90deg, transparent, black 30%, black 70%, transparent);
}

.hero-inner {
  position: relative;
  z-index: 2;
  padding-block: 44px 72px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 72px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 13px;
}

.breadcrumb a:hover {
  color: #fff;
}

.hero-copy {
  max-width: 880px;
}

.hero-badge {
  display: inline-block;
  margin-bottom: 24px;
  padding: 5px 11px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 12px;
  font-weight: 600;
}

.hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(52px, 7.3vw, 86px);
  font-weight: 750;
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero-copy > p {
  max-width: 690px;
  margin: 30px 0 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 18px;
  line-height: 1.7;
}

.hero-copy code {
  color: #fff;
  font-weight: 600;
}

.mail-flows {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 64px;
}

.flow-card {
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.09);
  backdrop-filter: blur(10px);
}

.flow-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.flow-icon {
  display: grid;
  place-items: center;
  width: 44px;
  aspect-ratio: 1;
  border-radius: 11px;
  color: #111;
  font-size: 20px;
  font-weight: 800;
}

.flow-icon-in {
  background: #d6b6f6;
}

.flow-icon-out {
  background: #62aef0;
}

.flow-label {
  display: block;
  color: rgba(255, 255, 255, 0.55);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.flow-heading h2 {
  margin: 1px 0 0;
  font-size: 21px;
  line-height: 1.2;
}

.flow-steps {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow-steps li {
  display: flex;
  align-items: center;
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
  line-height: 1.35;
}

.flow-steps li:not(:last-child)::after {
  content: "→";
  margin-inline: 10px;
  color: rgba(255, 255, 255, 0.38);
}

.hero-decoration {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.sticker {
  position: absolute;
  display: grid;
  place-items: center;
  width: 70px;
  aspect-ratio: 1;
  border-radius: 18px;
  color: #171717;
  font-size: 31px;
  font-weight: 800;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.22);
}

.sticker-mail {
  top: 112px;
  right: 6vw;
  background: #ff64c8;
  transform: rotate(9deg);
}

.sticker-route {
  right: 18vw;
  bottom: 250px;
  width: 52px;
  border-radius: 14px;
  background: #ffb681;
  font-size: 22px;
  transform: rotate(-8deg);
}

.hero-dot {
  position: absolute;
  width: 7px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 14px rgba(255, 255, 255, 0.9);
}

.hero-dot-one { top: 17%; left: 8%; }
.hero-dot-two { top: 30%; right: 22%; width: 4px; }
.hero-dot-three { bottom: 18%; right: 7%; width: 5px; }

.principle-band {
  border-bottom: 1px solid var(--hairline);
  background: var(--surface);
}

.principle-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  padding-block: 26px;
}

.principle-symbol {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 42px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--success-soft);
  color: var(--success);
  font-weight: 800;
}

.principle-inner strong {
  color: var(--ink);
  font-size: 17px;
}

.principle-inner p {
  margin: 3px 0 0;
  color: var(--ink-muted);
  font-size: 14px;
}

.guide-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(48px, 7vw, 92px);
  padding-block: 96px 128px;
}

.guide-nav {
  position: sticky;
  top: 100px;
  align-self: start;
}

.guide-nav-title {
  margin: 0 0 14px;
  color: var(--ink-faint);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.guide-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-nav li + li {
  margin-top: 2px;
}

.guide-nav li a {
  display: grid;
  grid-template-columns: 28px 1fr;
  align-items: center;
  min-height: 38px;
  padding: 5px 8px;
  border-radius: 6px;
  color: var(--ink-muted);
  font-size: 13px;
  transition: background-color 160ms ease, color 160ms ease;
}

.guide-nav li a:hover {
  background: var(--surface-muted);
  color: var(--ink);
}

.guide-nav li span {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 10px;
}

.guide-nav-secondary {
  display: grid;
  gap: 4px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
}

.guide-nav-secondary a {
  padding: 5px 8px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
}

.guide-content {
  min-width: 0;
}

.section-kicker {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.preflight h2,
.daily-use > h2,
.quick-reference > h2,
.faq > h2,
.final-check h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(34px, 4.2vw, 48px);
  font-weight: 740;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.preflight-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 34px;
}

.prep-card {
  min-height: 220px;
  padding: 22px;
  border: 1px solid var(--hairline);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.prep-number {
  display: grid;
  place-items: center;
  width: 36px;
  aspect-ratio: 1;
  margin-bottom: 38px;
  border-radius: 9px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 800;
}

.prep-card:nth-child(2) .prep-number {
  background: color-mix(in srgb, #d6b6f6 30%, var(--surface));
  color: color-mix(in srgb, #391c57 75%, var(--ink));
}

.prep-card:nth-child(3) .prep-number {
  background: color-mix(in srgb, #ffb681 28%, var(--surface));
  color: color-mix(in srgb, #793400 75%, var(--ink));
}

.prep-card h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.3;
}

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

.guide-step {
  margin-top: 112px;
  padding-top: 4px;
}

.step-header {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--hairline-strong);
}

.step-number {
  display: grid;
  place-items: center;
  width: 52px;
  aspect-ratio: 1;
  border-radius: 12px;
  background: var(--ink);
  color: var(--canvas);
  font-family: var(--mono);
  font-size: 13px;
}

.step-header h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(29px, 3.4vw, 40px);
  font-weight: 730;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.step-body {
  padding: 34px 0 0 82px;
}

.step-body > p {
  max-width: 730px;
  margin: 0 0 24px;
}

.step-body h3 {
  margin: 48px 0 14px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.015em;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  min-height: 48px;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  transition: background-color 160ms ease, transform 160ms ease;
}

.primary-link:hover {
  background: var(--primary-active);
  transform: translateY(-2px);
}

.path-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 24px 0;
  padding: 16px;
  border: 1px solid var(--hairline);
  border-radius: 9px;
  background: var(--surface-muted);
}

.path-box span {
  padding: 5px 9px;
  border: 1px solid var(--hairline-strong);
  border-radius: 5px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  font-weight: 500;
}

.path-box i {
  color: var(--ink-faint);
  font-size: 13px;
  font-style: normal;
}

.choice-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--hairline);
  border-radius: 9px;
  background: var(--surface);
}

.choice-check {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 24px;
  aspect-ratio: 1;
  border-radius: 5px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}

.choice-row strong {
  color: var(--ink);
  font-size: 14px;
}

.choice-row p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 13px;
}

.callout {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 13px;
  margin: 28px 0;
  padding: 20px;
  border: 1px solid transparent;
  border-radius: 12px;
}

.callout-icon {
  display: grid;
  place-items: center;
  width: 30px;
  aspect-ratio: 1;
  border-radius: 50%;
  font-weight: 800;
}

.callout strong {
  color: var(--ink);
}

.callout p {
  margin: 4px 0 0;
  color: var(--ink-muted);
  font-size: 14px;
}

.callout-warning {
  border-color: color-mix(in srgb, var(--warning) 25%, transparent);
  background: var(--warning-soft);
}

.callout-warning .callout-icon {
  background: var(--warning);
  color: var(--surface);
}

.callout-info {
  border-color: color-mix(in srgb, var(--primary) 25%, transparent);
  background: var(--info-soft);
}

.callout-info .callout-icon {
  background: var(--primary);
  color: #fff;
}

.callout-success {
  border-color: color-mix(in srgb, var(--success) 25%, transparent);
  background: var(--success-soft);
}

.callout-success .callout-icon {
  background: var(--success);
  color: var(--surface);
}

.field-list {
  margin: 22px 0;
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: 9px;
  background: var(--surface);
}

.field-list > div,
.identity-fields > div {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 18px;
  padding: 14px 16px;
}

.field-list > div + div,
.identity-fields > div + div {
  border-top: 1px solid var(--hairline);
}

.field-list span,
.identity-fields span {
  color: var(--ink-muted);
  font-size: 13px;
}

.field-list strong,
.identity-fields strong {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.settings-card {
  margin: 26px 0;
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.settings-card-primary {
  border-top: 4px solid var(--primary);
}

.settings-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
}

.status-badge {
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
}

.settings-list {
  margin: 0;
}

.settings-list > div {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 22px;
  padding: 13px 20px;
}

.settings-list > div + div {
  border-top: 1px solid var(--hairline);
}

.settings-list dt {
  color: var(--ink-muted);
  font-size: 13px;
}

.settings-list dd {
  margin: 0;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.settings-list code,
.reference-card code,
.fallback-config code {
  padding: 2px 5px;
  background: var(--surface-muted);
  color: var(--ink);
}

.identity-example {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 20px;
  margin: 28px 0;
  padding: 22px;
  border: 1px solid var(--hairline);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.identity-avatar {
  display: grid;
  place-items: center;
  width: 64px;
  aspect-ratio: 1;
  border-radius: 16px;
  background: var(--secondary);
  color: #fff;
  font-size: 28px;
  font-weight: 800;
}

.identity-fields {
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: 8px;
}

.identity-server {
  background: var(--primary-soft);
}

.identity-server strong {
  color: var(--primary);
}

.address-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.address-chips span {
  padding: 7px 11px;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-secondary);
  font-family: var(--mono);
  font-size: 12px;
}

.compose-preview {
  margin: 28px 0;
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.compose-toolbar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--hairline);
  background: var(--surface-muted);
}

.compose-toolbar > span {
  width: 9px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--hairline-strong);
}

.compose-toolbar > span:first-child { background: #ff7a73; }
.compose-toolbar > span:nth-child(2) { background: #f4bd4f; }
.compose-toolbar > span:nth-child(3) { background: #61c766; }

.compose-toolbar strong {
  margin-left: 9px;
  color: var(--ink-muted);
  font-size: 12px;
}

.compose-row {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 14px;
  min-height: 52px;
  padding-inline: 18px;
  color: var(--ink-muted);
  font-size: 13px;
}

.compose-row + .compose-row {
  border-top: 1px solid var(--hairline);
}

.compose-row strong {
  color: var(--ink);
  font-size: 14px;
}

.compose-row em {
  color: var(--ink-faint);
  font-style: normal;
}

.credential-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0;
}

.credential-correct,
.credential-wrong {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 20px;
  border-radius: 12px;
}

.credential-correct {
  border: 1px solid color-mix(in srgb, var(--success) 25%, transparent);
  background: var(--success-soft);
}

.credential-wrong {
  border: 1px solid color-mix(in srgb, var(--warning) 25%, transparent);
  background: var(--warning-soft);
}

.credential-correct > span,
.credential-wrong > span {
  display: grid;
  place-items: center;
  width: 28px;
  aspect-ratio: 1;
  border-radius: 50%;
  color: var(--surface);
  font-weight: 800;
}

.credential-correct > span { background: var(--success); }
.credential-wrong > span { background: var(--warning); }

.credential-compare small {
  display: block;
  margin-bottom: 5px;
  color: var(--ink-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.credential-compare strong {
  color: var(--ink);
  font-size: 14px;
}

.credential-compare p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 13px;
}

.daily-use,
.quick-reference,
.faq,
.final-check {
  margin-top: 128px;
}

.daily-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 36px;
}

.daily-grid article {
  padding: 26px;
  border: 1px solid var(--hairline);
  border-radius: 12px;
  background: var(--surface);
}

.daily-icon {
  display: grid;
  place-items: center;
  width: 42px;
  aspect-ratio: 1;
  margin-bottom: 38px;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 19px;
  font-weight: 800;
}

.daily-grid h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 20px;
}

.daily-grid p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 14px;
}

.webmail-warning {
  margin-top: 14px;
  padding: 26px;
  border-radius: 12px;
  background: var(--ink);
  color: var(--canvas);
}

.webmail-warning-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.webmail-warning-title span {
  display: grid;
  place-items: center;
  width: 28px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: #ffb681;
  color: #111;
  font-weight: 800;
}

.webmail-warning p {
  margin: 14px 0 0 40px;
  color: color-mix(in srgb, var(--canvas) 75%, transparent);
  font-size: 14px;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 36px;
}

.reference-card {
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
  border-radius: 16px;
  background: var(--surface);
}

.reference-title {
  padding: 24px;
  border-bottom: 1px solid var(--hairline);
}

.reference-primary .reference-title {
  background: var(--secondary);
  color: #fff;
}

.reference-title > span {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.reference-title h3 {
  margin: 4px 0 0;
  color: inherit;
  font-size: 22px;
}

.reference-card dl {
  margin: 0;
  padding: 8px 24px 18px;
}

.reference-card dl > div {
  padding: 11px 0;
}

.reference-card dl > div + div {
  border-top: 1px solid var(--hairline);
}

.reference-card dt {
  color: var(--ink-faint);
  font-size: 11px;
}

.reference-card dd {
  margin: 3px 0 0;
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.faq-list {
  margin-top: 36px;
  border-top: 1px solid var(--hairline-strong);
}

.faq-list details {
  border-bottom: 1px solid var(--hairline-strong);
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 18px 4px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 650;
  cursor: pointer;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary span {
  color: var(--primary);
  font-size: 22px;
  font-weight: 400;
  transition: transform 180ms ease;
}

.faq-list details[open] summary span {
  transform: rotate(45deg);
}

.faq-answer {
  max-width: 720px;
  padding: 0 46px 22px 4px;
  color: var(--ink-muted);
  font-size: 14px;
}

.faq-answer p {
  margin: 0 0 12px;
}

.fallback-config {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 16px 0;
  padding: 13px 15px;
  border-radius: 8px;
  background: var(--surface-muted);
}

.fallback-config span {
  color: var(--ink-muted);
}

.fallback-config strong {
  color: var(--ink);
}

.final-check {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(400px, 1fr);
  gap: 48px;
  padding: 48px;
  border-radius: 16px;
  background: var(--secondary);
  color: #fff;
}

.final-check .section-kicker {
  color: #8ac5f5;
}

.final-check h2 {
  color: #fff;
}

.final-check-copy p {
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 13px;
  align-items: center;
  min-height: 54px;
  padding-block: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
}

.checklist li:last-child {
  border-bottom: 0;
}

.checklist-number {
  display: grid;
  place-items: center;
  width: 30px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.13);
  font-family: var(--mono);
  font-size: 11px;
}

.checklist-text {
  min-width: 0;
}

.checklist code {
  color: #fff;
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: normal;
}

.footer {
  border-top: 1px solid var(--hairline);
  background: var(--surface-muted);
}

.footer-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding-block: 48px;
}

.footer-brand {
  color: var(--ink);
  font-size: 24px;
  font-weight: 760;
  letter-spacing: -0.04em;
}

.footer p {
  margin: 4px 0 0;
  color: var(--ink-faint);
  font-size: 12px;
}

.back-home {
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
}

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

  .guide-nav {
    position: static;
    display: none;
  }

  .sticker-mail {
    right: 3vw;
    opacity: 0.62;
  }

  .sticker-route {
    display: none;
  }

  .flow-steps {
    flex-direction: column;
    align-items: flex-start;
    gap: 7px;
  }

  .flow-steps li:not(:last-child)::after {
    content: "↓";
    margin-inline: 10px 0;
  }

  .final-check {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  :root {
    --container: min(100% - 32px, 1180px);
  }

  html {
    scroll-padding-top: 76px;
  }

  .topbar-inner {
    min-height: 62px;
  }

  .brand-divider,
  .page-name {
    display: none;
  }

  .brand > span:last-child {
    display: none;
  }

  .theme-control button {
    min-width: 48px;
    min-height: 34px;
    padding-inline: 7px;
  }

  .ai-help-trigger {
    min-height: 40px;
    padding-inline: 11px;
  }

  .ai-dialog-inner {
    padding: 30px 22px 24px;
  }

  .dialog-close {
    top: 14px;
    right: 14px;
  }

  .ai-dialog h2 {
    padding-right: 32px;
  }

  .ai-prompt {
    padding: 16px;
    font-size: 13px;
  }

  .hero-inner {
    padding-block: 30px 48px;
  }

  .breadcrumb {
    margin-bottom: 64px;
  }

  .hero h1 {
    font-size: clamp(45px, 13.5vw, 64px);
  }

  .hero-copy > p {
    margin-top: 24px;
    font-size: 16px;
  }

  .mail-flows,
  .preflight-grid,
  .daily-grid,
  .reference-grid,
  .credential-compare {
    grid-template-columns: 1fr;
  }

  .flow-card {
    padding: 20px;
  }

  .flow-steps {
    display: grid;
    grid-template-columns: 1fr;
  }

  .flow-steps li:not(:last-child)::after {
    margin-left: auto;
  }

  .sticker {
    display: none;
  }

  .principle-inner {
    align-items: flex-start;
  }

  .guide-layout {
    padding-block: 72px 88px;
  }

  .prep-card {
    min-height: 0;
  }

  .prep-number {
    margin-bottom: 24px;
  }

  .guide-step {
    margin-top: 88px;
  }

  .step-header {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 14px;
  }

  .step-number {
    width: 44px;
    border-radius: 10px;
  }

  .step-header h2 {
    font-size: 29px;
  }

  .step-body {
    padding: 28px 0 0;
  }

  .path-box {
    padding: 13px;
  }

  .field-list > div,
  .identity-fields > div,
  .settings-list > div {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .settings-list > div {
    padding-block: 12px;
  }

  .identity-example {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .identity-avatar {
    width: 54px;
  }

  .compose-row {
    grid-template-columns: 66px minmax(0, 1fr) 14px;
    gap: 8px;
    padding-inline: 13px;
  }

  .daily-use,
  .quick-reference,
  .faq,
  .final-check {
    margin-top: 96px;
  }

  .webmail-warning p {
    margin-left: 0;
  }

  .final-check {
    padding: 28px 22px;
  }

  .footer-inner {
    display: block;
  }

  .back-home {
    display: inline-block;
    margin-top: 28px;
  }
}

@media (max-width: 380px) {
  .ai-help-trigger {
    width: 40px;
    justify-content: center;
    padding-inline: 0;
  }

  .ai-help-trigger > span:last-child {
    display: none;
  }

  .theme-control button {
    min-width: 40px;
    font-size: 11px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero-badge {
    font-size: 11px;
  }

  .fallback-config {
    display: grid;
  }
}

@media print {
  :root,
  html[data-theme="dark"] {
    color-scheme: light;
    --canvas: #fff;
    --surface: #fff;
    --surface-muted: #f6f5f4;
    --ink: #000;
    --ink-secondary: #31302e;
    --ink-muted: #615d59;
    --hairline: #ddd;
    --hairline-strong: #ccc;
    --primary: #005bab;
  }

  .topbar,
  .guide-nav,
  .hero-decoration,
  .footer {
    display: none;
  }

  .hero {
    background: #fff;
    color: #000;
  }

  .hero-copy > p,
  .breadcrumb {
    color: #444;
  }

  .hero-badge {
    border-color: #aaa;
  }

  .flow-card {
    border-color: #ccc;
    background: #fff;
    color: #000;
  }

  .flow-steps li,
  .flow-label {
    color: #333;
  }

  .guide-layout {
    display: block;
    padding-block: 48px;
  }

  .guide-step,
  .settings-card,
  .identity-example,
  .reference-card {
    break-inside: avoid;
  }
}

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

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