:root {
  --ink: #17243a;
  --ink-deep: #101a2b;
  --ink-soft: #233b5d;
  --paper: #17243a;
  --paper-local: #fffaf1;
  --paper-pure: #ffffff;
  --paper-blue: #e8f4ff;
  --line: #d7dee7;
  --muted: #5d6875;
  --muted-light: #cbd9e8;
  --brand: #087ac1;
  --brand-bright: #1699dc;
  --brand-pale: #9bd7f3;
  --accent: #f39ab7;
  --success: #3d8762;
  --shadow: 0 16px 36px rgba(16, 26, 43, 0.10);
  --shadow-small: 0 6px 16px rgba(16, 26, 43, 0.06);
  --wrap: 1260px;
  --header-h: 66px;
  --h1: clamp(44px, 5.1vw, 64px);
  --h2: clamp(35px, 4vw, 46px);
  --h3: clamp(21px, 2vw, 26px);
  --body: clamp(21px, 1.65vw, 23px);
  --small: 15px;
  --radius-control: 999px;
  --radius-card: 16px;
  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 40px;
  --s5: 72px;
  --s6: 126px;
  --s7: 160px;
  --font-body: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: var(--font-body);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
}

body.nav-open,
body.reader-open {
  overflow: hidden;
}

button,
input,
summary {
  font: inherit;
}

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

a {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

img,
svg {
  display: block;
  max-width: 100%;
}

.wrap {
  width: min(calc(100% - 48px), var(--wrap));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  min-height: var(--header-h);
  color: var(--paper-pure);
  background: rgba(16, 26, 43, 0.82);
  border-bottom: 0 solid transparent;
  backdrop-filter: blur(16px);
}

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: var(--s3);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 10px;
  color: var(--paper-pure);
  font-size: 23px;
  font-weight: 700;
  text-decoration: none;
}

.brand img {
  width: 38px;
  height: 38px;
}

.site-header .brand img {
  box-sizing: border-box;
  padding: 6px;
  background: var(--paper-pure);
  border-radius: 10px;
}

.brand-name {
  display: inline;
  overflow: visible;
  white-space: nowrap;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.primary-nav a,
.nav-drawer a {
  padding: 9px 13px;
  border-radius: var(--radius-control);
  font-size: 15px;
  line-height: 1.25;
  text-decoration: none;
  white-space: nowrap;
}

.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  color: var(--ink-deep);
  background: var(--paper-pure);
}

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

.language-menu {
  position: relative;
}

.language-menu summary {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 0 16px;
  color: var(--paper-pure);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius-control);
  cursor: pointer;
  font-size: 15px;
  list-style: none;
}

.language-menu summary::-webkit-details-marker {
  display: none;
}

.language-list {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 168px;
  padding: 8px;
  color: var(--ink);
  background: var(--paper-pure);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-small);
}

.language-list a {
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 14px;
  text-decoration: none;
}

.language-list a:hover,
.language-list a[aria-current="page"] {
  background: var(--paper-blue);
  color: var(--brand);
}

.header-login {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 0 18px;
  color: var(--paper-pure);
  border: 1px solid var(--paper-pure);
  border-radius: var(--radius-control);
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
}

.nav-toggle {
  width: 42px;
  height: 42px;
  display: none;
  place-items: center;
  padding: 0;
  color: var(--paper-pure);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  width: 18px;
  height: 2px;
  display: block;
  background: currentColor;
}

.nav-toggle::before,
.nav-toggle::after {
  content: "";
}

.nav-drawer {
  display: none;
  padding: 8px 24px 20px;
  background: var(--ink-deep);
}

.nav-drawer a {
  color: var(--paper-pure);
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 1320px;
  color: var(--paper-pure);
  background: linear-gradient(165deg, var(--ink-deep) 0%, var(--ink-soft) 58%, #0d5f94 100%);
}

.hero::before,
.hero::after {
  display: none;
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 790px;
  margin: 0 auto;
  padding-top: 118px;
  text-align: center;
}

.hero h1,
.section-heading h2,
.split-copy h2,
.final-cta h2 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hero h1 {
  max-width: 760px;
  margin: 0 auto;
  font-size: var(--h1);
  line-height: 1.11;
  text-wrap: balance;
}

.hero h1 span {
  display: block;
  color: var(--brand-pale);
}

.hero-subtitle {
  max-width: 700px;
  margin: 24px auto 0;
  font-size: var(--body);
  line-height: 1.4;
}

.mode-switch {
  width: min(100%, 560px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 34px auto 0;
}

.mode-tab {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  color: var(--paper-pure);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: var(--radius-control);
  box-shadow: none;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
}

.mode-tab[aria-selected="true"] {
  color: var(--paper-pure);
  background: var(--brand-bright);
  border-color: var(--brand-bright);
  box-shadow: var(--shadow-small);
}

.hero-stage {
  position: relative;
  z-index: 2;
  width: min(calc(100% - 48px), 1180px);
  min-height: 650px;
  margin: 58px auto 0;
}

.tool-window {
  position: relative;
  z-index: 3;
  min-height: 628px;
  overflow: hidden;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.96);
  border: 12px solid rgba(155, 215, 243, 0.27);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.window-bar {
  min-height: 52px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 18px;
  background: var(--paper-blue);
  border-bottom: 1px solid var(--line);
}

/* No OS traffic-light chrome (2026-09-04 tasteBlock). Paper title strip only. */
.window-dot {
  display: none;
}

.window-title {
  margin-left: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.tool-panel {
  display: grid;
  grid-template-columns: 390px minmax(0, 1fr);
  min-height: 564px;
}

.mail-sidebar {
  background: var(--paper-local);
  border-right: 1px solid var(--line);
}

.address-box {
  padding: 20px;
  border-bottom: 1px solid var(--line);
}

.address-line {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.mail-address {
  min-width: 0;
  overflow: hidden;
  color: var(--ink-deep);
  font-size: clamp(13px, 1.2vw, 16px);
  font-weight: 750;
  white-space: nowrap;
}

.copy-button,
.refresh-button,
.text-button,
.primary-button,
.secondary-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-control);
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.copy-button {
  flex: 0 0 auto;
  padding: 0 17px;
  color: var(--paper-pure);
  background: var(--brand);
  border: 0;
  box-shadow: var(--shadow-small);
}

.mail-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
}

.live-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.live-status::before {
  width: 8px;
  height: 8px;
  display: block;
  background: var(--success);
  border-radius: 50%;
  content: "";
}

.text-button {
  min-height: 32px;
  padding: 0 12px;
  color: var(--brand);
  background: transparent;
  border: 1px solid var(--line);
}

.reader-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.reader-body iframe {
  display: block;
  width: 100%;
  min-height: 280px;
  border: 0;
  background: var(--paper-pure);
}

@media (min-width: 721px) {
  [data-reader-close] {
    display: none;
  }
}

.inbox-tools {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
  border-bottom: 1px solid var(--line);
}

.inbox-tools h2 {
  margin: 0;
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.3;
}

.refresh-button {
  min-height: 34px;
  padding: 0 14px;
  color: var(--ink);
  background: var(--paper-pure);
  border: 1px solid var(--line);
}

.message-list {
  max-height: 386px;
  overflow-y: auto;
}

.message-row {
  width: 100%;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 12px;
  padding: 18px 20px;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  text-align: left;
}

.message-row:hover,
.message-row.is-active {
  background: var(--paper-blue);
}

.sender-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--paper-pure);
  background: var(--brand);
  border-radius: 50%;
  font-weight: 800;
}

.sender-mark.steam {
  background: var(--ink-soft);
}

.message-meta {
  min-width: 0;
}

.message-meta strong,
.message-meta span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-meta strong {
  font-size: 14px;
}

.message-meta span,
.message-time {
  color: var(--muted);
  font-size: 12px;
}

.demo-badge {
  width: max-content;
  margin-top: 5px;
  padding: 2px 8px;
  color: var(--brand);
  background: var(--paper-blue);
  border-radius: var(--radius-control);
  font-size: 11px;
  font-weight: 800;
}

.mail-reader {
  min-width: 0;
  padding: 36px 42px;
  background: var(--paper-pure);
}

.reader-head {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.reader-head h3 {
  margin: 0 0 10px;
  font-size: var(--h3);
  line-height: 1.25;
}

.reader-head p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.reader-body {
  max-width: 650px;
  padding-top: 28px;
  color: var(--ink);
  font-size: 16px;
}

.reader-body p {
  margin: 0 0 16px;
}

.code-block,
.code-card {
  width: max-content;
  margin: 24px 0;
  padding: 18px 26px;
  color: var(--ink-deep);
  background: var(--paper-blue);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.mail-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  color: var(--ink-deep);
  font-size: 18px;
  font-weight: 800;
}

.mail-brand svg {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
}

.deal-board {
  margin: 22px 0;
  padding: 22px;
  background: var(--paper-local);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.deal-board strong {
  display: block;
  margin: 0 0 12px;
  font-size: 20px;
}

.deal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 8px;
}

.deal-price,
.deal-off,
.deal-until {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  background: var(--paper-pure);
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  font-weight: 700;
}

.demo-fake-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 18px;
  margin-top: 16px;
  color: var(--paper-pure);
  background: var(--brand);
  border-radius: var(--radius-control);
  pointer-events: none;
  font-weight: 700;
}

.demo-notice {
  margin-top: 20px;
  color: var(--muted);
  font-size: 13px;
}

.alias-preview {
  display: none;
  min-height: 564px;
  padding: 70px 9%;
  text-align: center;
}

.alias-preview.is-active {
  display: grid;
  place-items: center;
}

.alias-card {
  max-width: 580px;
}

.alias-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.alias-card p {
  margin: 18px 0 26px;
  color: var(--muted);
  font-size: 18px;
}

.primary-button {
  padding: 0 24px;
  color: var(--paper-pure);
  background: var(--brand);
  border: 1px solid var(--brand);
  box-shadow: var(--shadow-small);
}

.secondary-button {
  padding: 0 24px;
  color: var(--brand);
  background: var(--paper-pure);
  border: 1px solid var(--brand);
}

.shape {
  position: absolute;
  z-index: 1;
  pointer-events: none;
}
.shape-pink {
  top: 12%;
  left: 4%;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #f8a5c0;
}
.shape-blue {
  top: 22%;
  right: 7%;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #87c2eb;
}
.shape-triangle {
  top: 8%;
  right: 18%;
  width: 0;
  height: 0;
  border-left: 12px solid transparent;
  border-right: 12px solid transparent;
  border-bottom: 20px solid #f6d48a;
}

.light-main {
  overflow: hidden;
  background: var(--paper-local);
}

.section {
  padding: var(--s6) 0;
}

.section.paper {
  background: var(--paper-local);
}

.section.white {
  background: var(--paper-pure);
}

.section-heading {
  max-width: 830px;
  margin: 0 auto 64px;
  text-align: center;
}

.eyebrow {
  width: max-content;
  min-width: 0;
  max-width: min(100%, calc(100vw - 48px));
  overflow-wrap: anywhere;
  margin: 0 0 12px;
  padding: 5px 13px;
  color: var(--brand);
  background: var(--paper-blue);
  border-radius: var(--radius-control);
  font-size: 13px;
  font-weight: 800;
}

.section-heading .eyebrow {
  margin-right: auto;
  margin-left: auto;
}

.section-heading h2,
.split-copy h2,
.final-cta h2 {
  margin: 0;
  font-size: var(--h2);
  line-height: 1.16;
}

.section-intro {
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.55;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.feature-card {
  padding: 30px;
  background: var(--paper-pure);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.feature-card svg {
  width: 42px;
  height: 42px;
  margin-bottom: 24px;
  color: var(--brand);
}

.feature-card h3,
.step h3,
.use-card h3,
.faq-item h3 {
  margin: 0;
  font-size: var(--h3);
  line-height: 1.3;
}

.feature-card p,
.step p,
.use-card p,
.faq-item p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  align-items: center;
  gap: 8%;
}

.split-copy .section-intro {
  margin-left: 0;
}

.timeline {
  display: grid;
  gap: 18px;
}

.step {
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  gap: 18px;
  padding: 24px;
  background: var(--paper-pure);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.step-number {
  width: 50px;
  height: 50px;
  display: grid;
  place-items: center;
  color: var(--paper-pure);
  background: var(--brand);
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
}

.use-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.use-card {
  min-height: 260px;
  padding: 36px;
  background: var(--paper-pure);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.use-card:nth-child(2),
.use-card:nth-child(3) {
  background: var(--paper-blue);
}

.limit-panel {
  padding: 54px;
  color: var(--paper-pure);
  background: linear-gradient(135deg, var(--ink-deep), var(--ink-soft));
  border-radius: 34px;
}

.limit-panel h2 {
  max-width: 680px;
  margin: 0;
  color: var(--paper-pure);
  font-family: var(--font-display);
  font-size: var(--h2);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.18;
}

.limit-panel > p {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--muted-light);
  font-size: 20px;
}

.limit-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 42px;
}

.limit-item {
  padding: 24px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-card);
}

.limit-item strong {
  display: block;
  margin-bottom: 8px;
  color: var(--brand-pale);
  font-size: 18px;
}

.limit-item span {
  color: var(--paper-pure);
  font-size: 15px;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.faq-item {
  padding: 30px;
  background: var(--paper-pure);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.final-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 48px;
  padding: 58px;
  background: var(--paper-blue);
  border-radius: 34px;
}

.final-cta p {
  max-width: 720px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.site-footer {
  color: var(--paper-pure);
  background: var(--ink-deep);
  padding: 70px 0 34px;
}
.site-footer .brand img {
  box-sizing: border-box;
  padding: 6px;
  background: var(--paper-pure);
  border-radius: 10px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) repeat(5, minmax(0, 1fr));
  gap: 44px;
}

.footer-column {
  min-width: 0;
}

.footer-brand p {
  max-width: 410px;
  margin: 18px 0 0;
  color: var(--muted-light);
  font-size: 15px;
}

.footer-mail {
  display: grid;
  gap: 8px;
  margin-top: 18px;
  max-width: 280px;
}

.footer-mail label {
  color: var(--paper-pure);
  font-size: 13px;
  font-weight: 700;
}

.footer-mail input {
  width: 100%;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--paper-pure);
}

.footer-mail a {
  display: grid;
  place-items: center;
  min-height: 40px;
  border-radius: 8px;
  background: var(--paper-pure);
  color: var(--ink-deep);
  font-weight: 700;
  text-decoration: none;
}

.footer-column h2 {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 15px;
}

.footer-column a {
  display: block;
  width: auto;
  max-width: 100%;
  margin-top: 10px;
  color: var(--muted-light);
  font-size: 14px;
  text-decoration: none;
  overflow-wrap: anywhere;
}

.footer-column a:hover {
  color: var(--brand-pale);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 56px;
  padding-top: 24px;
  color: var(--muted-light);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 13px;
}

.toast {
  position: fixed;
  z-index: 90;
  right: 24px;
  bottom: 24px;
  max-width: min(360px, calc(100% - 48px));
  padding: 13px 18px;
  color: var(--paper-pure);
  background: var(--ink-deep);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-control);
  box-shadow: var(--shadow-small);
  font-size: 14px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 980px) {
  .primary-nav {
    display: none;
  }

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

  .nav-toggle {
    display: grid;
  }

  .nav-drawer.is-open {
    display: grid;
    gap: 4px;
  }

  .hero {
    min-height: 1240px;
  }

  .tool-panel {
    grid-template-columns: 330px minmax(0, 1fr);
  }

  .mail-reader {
    padding: 30px;
  }

  .feature-grid,
  .limit-list {
    grid-template-columns: 1fr;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

@media (max-width: 720px) {
  :root {
    --h1: clamp(42px, 13vw, 56px);
    --h2: clamp(32px, 10vw, 42px);
    --body: 21px;
    --s6: 94px;
  }

  .wrap {
    width: min(calc(100% - 32px), var(--wrap));
  }

  .brand {
    font-size: 20px;
  }

  .brand img {
    width: 34px;
    height: 34px;
  }

  .header-login {
    display: none;
  }

  .language-menu summary {
    min-height: 38px;
    padding: 0 12px;
  }

  .hero {
    min-height: auto;
    padding-bottom: 90px;
  }

  .hero-copy {
    padding-top: 76px;
  }

  .hero-subtitle {
    margin-top: 20px;
  }

  .mode-switch {
    gap: 8px;
    margin-top: 28px;
  }

  .mode-tab {
    min-height: 44px;
    padding: 0 12px;
    font-size: 14px;
  }

  .hero-stage {
    width: min(calc(100% - 24px), 1180px);
    min-height: auto;
    margin-top: 38px;
  }

  .tool-window {
    min-height: 0;
    border-width: 7px;
    border-radius: 20px;
  }

  .tool-panel {
    display: block;
    min-height: 0;
  }

  .mail-sidebar {
    border-right: 0;
  }

  .address-box {
    padding: 20px 16px;
  }

  .address-line {
    align-items: stretch;
    flex-direction: column;
  }

  .mail-address {
    font-size: 16px;
  }

  .copy-button {
    width: 100%;
  }

  .mail-status {
    flex-wrap: wrap;
  }

  .message-list {
    max-height: 344px;
  }

  .tool-panel > .mail-reader {
    display: none;
  }

  .mail-reader.is-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 80;
    padding: 0;
    background: var(--paper-pure);
    isolation: isolate;
  }

  .mail-reader.is-open .reader-head {
    position: sticky;
    top: 0;
    z-index: 1;
    padding: 16px 20px;
    background: var(--paper-pure);
  }

  .mail-reader.is-open .reader-body {
    flex: 1;
    min-height: 0;
    max-width: none;
    overflow: auto;
    padding: 20px;
  }

  .mail-reader.is-open .reader-body iframe {
    min-height: 60vh;
  }

  .alias-preview {
    min-height: 500px;
    padding: 48px 24px;
  }

  .shape-pink {
    width: 28px;
    height: 28px;
    left: 8px;
    top: 10px;
  }

  .shape-blue {
    width: 20px;
    height: 20px;
    right: 12px;
    top: 36px;
  }

  .section-heading {
    margin-bottom: 42px;
  }

  .feature-grid,
  .use-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .feature-card,
  .use-card,
  .faq-item {
    padding: 26px;
  }

  .limit-panel,
  .final-cta {
    padding: 34px 26px;
    border-radius: 24px;
  }

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

  .final-cta .primary-button {
    width: 100%;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

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