* {
  box-sizing: border-box;
}

:root {
  --page: #f5f7fb;
  --surface: rgba(255,255,255,.92);
  --surface-solid: #ffffff;
  --surface-soft: #f8fafc;

  --text: #172033;
  --text-soft: #677084;
  --text-faint: #8b94a6;

  --line: #e5eaf1;
  --line-strong: #d9e0ea;

  --primary: #2764e7;
  --primary-hover: #1f54ca;
  --primary-soft: #eef4ff;

  --success: #1b8c59;
  --warning: #b97913;
  --danger: #c84545;

  --radius: 16px;
  --radius-small: 11px;

  --shadow:
    0 16px 46px rgba(28, 43, 72, .08);

  --content: 1180px;
}

html {
  min-height: 100%;
  background: var(--page);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 78% -10%, #e8f0ff 0, transparent 36%),
    radial-gradient(circle at -8% 18%, #eef4ff 0, transparent 28%),
    var(--page);

  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Microsoft YaHei",
    "PingFang SC",
    Arial,
    sans-serif;
}

button,
input {
  font: inherit;
}

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

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

.hidden {
  display: none !important;
}

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  position: sticky;
  z-index: 40;
  top: 0;

  border-bottom: 1px solid rgba(221,228,238,.8);
  background: rgba(248,250,253,.86);
  backdrop-filter: blur(18px);
}

.header-inner {
  width: min(var(--content), calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;

  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  min-width: 265px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 42px;
  height: 42px;

  display: block;
  flex: 0 0 42px;

  object-fit: contain;

  border-radius: 10px;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.brand-copy strong {
  font-size: 15px;
  font-weight: 680;
  letter-spacing: .1px;
}

.brand-copy span {
  color: var(--text-faint);
  font-size: 11px;
  letter-spacing: .7px;
}

.main-nav {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
}

.main-nav a {
  padding: 8px 12px;
  border-radius: 9px;

  color: var(--text-soft);
  font-size: 14px;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
  background: rgba(255,255,255,.82);
}

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

.mobile-nav-button {
  display: none;
  border: 0;
  background: transparent;
  font-size: 22px;
  cursor: pointer;
}

.button {
  min-height: 40px;
  padding: 0 18px;

  border: 1px solid transparent;
  border-radius: 10px;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;

  cursor: pointer;

  font-weight: 620;
  transition:
    border .15s ease,
    background .15s ease,
    color .15s ease,
    transform .15s ease;
}

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

.button-small {
  min-height: 36px;
  padding: 0 14px;
  font-size: 13px;
}

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

.button-primary:hover {
  background: var(--primary-hover);
}

.button-ghost {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255,255,255,.68);
}

.button-ghost:hover {
  border-color: var(--line-strong);
  background: #fff;
}

.button-wide {
  width: 100%;
}

.app-main {
  width: min(var(--content), calc(100% - 40px));
  margin: 0 auto;
  padding: 36px 0 70px;
  flex: 1;
}

.hero {
  min-height: 445px;
  display: grid;
  grid-template-columns: minmax(0,1.08fr) minmax(360px,.92fr);
  align-items: center;
  gap: 50px;
}

.hero-copy h1 {
  max-width: 760px;
  margin: 0;

  font-size: clamp(42px, 5vw, 68px);
  line-height: 1.08;
  letter-spacing: -2.2px;
}

.hero-copy h1 span {
  display: block;
  margin-top: 4px;
  color: var(--primary);
}

.hero-copy p {
  max-width: 620px;
  margin: 24px 0 0;

  color: var(--text-soft);
  font-size: 17px;
  line-height: 1.8;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-panel {
  padding: 24px;

  border: 1px solid rgba(219,226,237,.9);
  border-radius: 24px;

  background:
    linear-gradient(160deg, rgba(255,255,255,.96), rgba(247,250,255,.9));

  box-shadow: var(--shadow);
}

.hero-status {
  display: flex;
  gap: 10px;
  align-items: center;

  color: var(--success);
  font-size: 13px;
  font-weight: 650;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: currentColor;
}

.hero-demo {
  margin-top: 20px;
  display: grid;
  gap: 10px;
}

.demo-row {
  padding: 14px 16px;

  border: 1px solid var(--line);
  border-radius: 14px;

  background: #fff;

  box-shadow:
    0 5px 18px rgba(37,53,78,.035);
}

.demo-row small {
  display: block;
  margin-bottom: 6px;

  color: var(--text-faint);

  font-size: 12px;
  font-weight: 620;
}

.demo-row strong {
  display: block;

  color: var(--text);

  font-size: 14px;
  font-weight: 650;
  line-height: 1.55;
}

.demo-me {
  margin-right: 24px;
}

.demo-translation {
  margin-left: 24px;

  border-color: #d9e5ff;
  background: #f7faff;
}

.demo-translation small {
  color: var(--primary);
}

.demo-other {
  margin-right: 24px;
}

.section {
  margin-top: 62px;
}

.section-heading {
  margin-bottom: 25px;
}

.section-heading h2 {
  margin: 0;
  font-size: 29px;
  letter-spacing: -.6px;
}

.section-heading p {
  max-width: 650px;
  margin: 10px 0 0;

  color: var(--text-soft);
  line-height: 1.7;
}

.feature-grid,
.card-grid,
.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 16px;
}

.feature-card,
.card,
.summary-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 10px 32px rgba(38,52,76,.045);
}

.feature-card {
  padding: 23px;
}

.feature-icon {
  width: 42px;
  height: 42px;

  display: grid;
  place-items: center;

  margin-bottom: 17px;
  border-radius: 12px;

  color: var(--primary);
  background: var(--primary-soft);

  font-size: 19px;
}

.feature-card h3 {
  margin: 0;
  font-size: 16px;
}

.feature-card p {
  margin: 9px 0 0;
  color: var(--text-soft);
  line-height: 1.7;
  font-size: 14px;
}

.page-head {
  margin-bottom: 28px;
}

.page-head h1 {
  margin: 0;
  font-size: 32px;
  letter-spacing: -.8px;
}

.page-head p {
  margin: 9px 0 0;
  color: var(--text-soft);
}

.card {
  overflow: hidden;
}

.card-body {
  padding: 22px;
}

.plan-card {
  position: relative;
}

.plan-card.featured {
  border-color: #cbdcff;
}

.featured-tag {
  position: absolute;
  right: 18px;
  top: 18px;

  padding: 5px 9px;
  border-radius: 999px;

  color: #2458c4;
  background: #edf4ff;

  font-size: 11px;
  font-weight: 700;
}

.plan-card h3 {
  margin: 0;
  font-size: 19px;
}

.plan-description {
  min-height: 45px;
  margin: 9px 0 20px;
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.65;
}

.price-line {
  margin: 8px 0 18px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.price-line strong {
  font-size: 30px;
}

.price-line span {
  color: var(--text-faint);
  font-size: 12px;
}

.feature-list {
  min-height: 120px;
  margin: 18px 0 24px;
  padding: 0;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding: 7px 0 7px 22px;

  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.5;
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;

  color: var(--success);
  font-weight: 800;
}

.auth-layout {
  min-height: calc(100vh - 230px);

  display: grid;
  grid-template-columns: minmax(420px,.95fr) minmax(380px,.72fr);
  justify-content: center;
  align-items: center;
  gap: 56px;

  padding: 32px 0 58px;
}

.auth-intro {
  max-width: 590px;
  padding-left: 12px;
}

.auth-intro h1 {
  margin: 0;

  font-size: 40px;
  line-height: 1.16;
  letter-spacing: -1.2px;
}

.auth-intro h1 span {
  display: block;
  white-space: nowrap;
}

.auth-intro p {
  max-width: 520px;
  margin: 18px 0 0;

  color: var(--text-soft);
  line-height: 1.75;
}

.form-card {
  width: 100%;
  max-width: 455px;

  padding: 28px 30px;

  border: 1px solid var(--line);
  border-radius: 20px;

  background: rgba(255,255,255,.94);
  box-shadow: var(--shadow);
}

.form-card h2 {
  margin: 0 0 5px;
  font-size: 24px;
}

.form-subtitle {
  margin: 0 0 25px;
  color: var(--text-soft);
  font-size: 13px;
}

.field {
  margin-top: 16px;
}

.field label {
  display: block;
  margin-bottom: 7px;

  color: #465069;
  font-size: 13px;
  font-weight: 620;
}

.field input {
  width: 100%;
  min-height: 44px;
  padding: 0 13px;

  border: 1px solid var(--line-strong);
  border-radius: 10px;
  outline: none;

  color: var(--text);
  background: #fff;
}

.field input:focus {
  border-color: #8eb0f5;
  box-shadow: 0 0 0 3px rgba(39,100,231,.08);
}

.inline-field {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  gap: 9px;
}

.form-actions {
  margin-top: 24px;
}

.form-links {
  margin-top: 18px;

  display: flex;
  justify-content: space-between;
  gap: 15px;

  color: var(--primary);
  font-size: 13px;
}

.checkbox-row {
  margin-top: 15px;
  display: flex;
  align-items: center;
  gap: 8px;

  color: var(--text-soft);
  font-size: 13px;
}

.checkbox-row input {
  width: 16px;
  height: 16px;
}

.form-message {
  min-height: 20px;
  margin-top: 13px;

  color: var(--danger);
  font-size: 13px;
  line-height: 1.5;
}

.form-message.success {
  color: var(--success);
}

.summary-card {
  padding: 21px;
}

.summary-card small {
  display: block;
  color: var(--text-faint);
  font-size: 12px;
}

.summary-card strong {
  display: block;
  margin-top: 10px;

  font-size: 18px;
  line-height: 1.4;
}

.account-email {
  margin-top: 7px;
  color: var(--text-soft);
}

.account-section {
  margin-top: 22px;
}

.account-section h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.detail-panel {
  padding: 24px;

  border: 1px solid var(--line);
  border-radius: var(--radius);

  background: #fff;
}

.detail-row {
  min-height: 47px;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;

  border-bottom: 1px solid #edf0f5;
}

.detail-row:last-child {
  border-bottom: 0;
}

.detail-row span {
  color: var(--text-soft);
  font-size: 13px;
}

.detail-row strong {
  text-align: right;
  font-size: 13px;
}

.release-list {
  display: grid;
  gap: 12px;
}

.release-card {
  padding: 20px;

  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px;

  border: 1px solid var(--line);
  border-radius: 14px;

  background: #fff;
}

.release-main h3 {
  margin: 0;
  font-size: 17px;
}

.release-main p {
  max-width: 720px;
  margin: 9px 0 0;

  color: var(--text-soft);
  line-height: 1.7;
  font-size: 13px;
}

.release-meta {
  margin-top: 10px;
  color: var(--text-faint);
  font-size: 12px;
}

.download-actions {
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 130px;
}

.empty-state,
.error-state,
.page-loading {
  min-height: 260px;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 13px;

  color: var(--text-soft);
  text-align: center;
}

.spinner {
  width: 25px;
  height: 25px;

  border: 3px solid #e1e7f0;
  border-top-color: var(--primary);
  border-radius: 50%;

  animation: spin .7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.toast {
  position: fixed;
  z-index: 100;
  left: 50%;
  bottom: 30px;

  min-width: 240px;
  max-width: min(520px, calc(100% - 32px));

  padding: 12px 16px;
  border-radius: 10px;

  color: #fff;
  background: rgba(28,36,51,.93);
  box-shadow: 0 10px 35px rgba(0,0,0,.16);

  text-align: center;
  font-size: 13px;

  transform: translate(-50%, 18px);
  opacity: 0;
  pointer-events: none;

  transition:
    opacity .18s ease,
    transform .18s ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%,0);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(250,251,253,.8);
}

.footer-inner {
  width: min(var(--content), calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 32px;

  display: flex;
  justify-content: space-between;
  gap: 30px;
}

.footer-inner strong {
  font-size: 14px;
}

.footer-inner p {
  margin: 8px 0 0;

  color: var(--text-faint);
  font-size: 12px;
}

.footer-note {
  display: flex;
  align-items: center;
  gap: 15px;

  color: var(--text-faint);
  font-size: 12px;
}


@media (max-width: 900px) {

  .header-inner {
    gap: 14px;
  }

  .brand {
    min-width: 0;
    flex: 1;
  }

  .main-nav {
    position: absolute;
    top: 72px;
    left: 20px;
    right: 20px;

    padding: 12px;

    display: none;
    flex-direction: column;
    align-items: stretch;

    border: 1px solid var(--line);
    border-radius: 14px;

    background: #fff;
    box-shadow: var(--shadow);
  }

  .main-nav.open {
    display: flex;
  }

  .mobile-nav-button {
    display: block;
  }

  .header-actions .button-ghost.guest-only {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 18px;
  }

  .demo-me,
  .demo-translation,
  .demo-other {
    margin-left: 0;
    margin-right: 0;
  }

  .feature-grid,
  .card-grid,
  .summary-grid {
    grid-template-columns: repeat(2, minmax(0,1fr));
  }

  .auth-layout {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 28px 0 52px;
  }

  .auth-intro {
    display: none;
  }

  .form-card {
    margin: 30px auto;
  }
}


@media (max-width: 620px) {

  .header-inner,
  .app-main,
  .footer-inner {
    width: min(100% - 28px, var(--content));
  }

  .brand-copy span {
    display: none;
  }

  .brand-copy strong {
    max-width: 150px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .header-actions {
    gap: 5px;
  }

  .header-actions .button {
    padding: 0 10px;
  }

  .app-main {
    padding-top: 28px;
  }

  .hero {
    min-height: auto;
  }

  .hero-copy h1 {
    font-size: 39px;
    letter-spacing: -1.4px;
  }

  .hero-copy p {
    font-size: 15px;
  }

  .feature-grid,
  .card-grid,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .page-head h1 {
    font-size: 27px;
  }

  .form-card {
    padding: 23px 18px;
  }

  .release-card {
    flex-direction: column;
  }

  .download-actions {
    width: 100%;
  }

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

  .footer-note {
    flex-wrap: wrap;
  }
}


.preview-state {
  min-height: 360px;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  gap: 11px;

  color: var(--text-soft);
  text-align: center;
}

.preview-state-icon {
  min-width: 54px;
  height: 30px;

  padding: 0 10px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  margin-bottom: 4px;

  border-radius: 999px;

  color: var(--primary);
  background: var(--primary-soft);

  font-size: 12px;
  font-weight: 700;
}

.preview-state strong {
  color: var(--text);
  font-size: 18px;
}

.preview-state span {
  max-width: 440px;

  margin-bottom: 8px;

  line-height: 1.7;
  font-size: 14px;
}


.order-list {
  display: grid;
  gap: 12px;
}

.order-card {
  padding: 18px 20px;

  display: grid;
  grid-template-columns:
    minmax(190px,1.6fr)
    minmax(100px,.7fr)
    minmax(120px,.8fr)
    minmax(170px,1fr);

  gap: 18px;
  align-items: center;

  border: 1px solid var(--line);
  border-radius: 14px;

  background: #fff;

  transition:
    border .15s ease,
    box-shadow .15s ease;
}

.order-card:hover {
  border-color: #cbd8ef;

  box-shadow:
    0 10px 28px rgba(35,53,81,.06);
}

.order-card div {
  min-width: 0;
}

.order-card small {
  display: block;
  margin-bottom: 5px;

  color: var(--text-faint);
  font-size: 11px;
}

.order-card strong {
  display: block;

  overflow: hidden;
  text-overflow: ellipsis;

  color: var(--text);
  font-size: 13px;
}

.payment-placeholder {
  margin-top: 22px;
  padding: 22px 24px;

  border: 1px dashed #cbd8ef;
  border-radius: var(--radius);

  background: #f8faff;
}

.payment-placeholder strong {
  font-size: 17px;
}

.payment-placeholder p {
  margin: 8px 0 0;

  color: var(--text-soft);
  line-height: 1.7;
  font-size: 13px;
}

.feedback-layout {
  display: grid;
  grid-template-columns:
    minmax(360px,.75fr)
    minmax(0,1.25fr);

  gap: 24px;
  align-items: start;
}

.feedback-form {
  max-width: none;
}

.field select,
.field textarea {
  width: 100%;

  padding: 11px 13px;

  border: 1px solid var(--line-strong);
  border-radius: 10px;
  outline: none;

  color: var(--text);
  background: #fff;

  font: inherit;
}

.field select {
  min-height: 44px;
}

.field textarea {
  min-height: 140px;
  resize: vertical;
}

.field select:focus,
.field textarea:focus {
  border-color: #8eb0f5;

  box-shadow:
    0 0 0 3px rgba(39,100,231,.08);
}

.compact-heading {
  margin-bottom: 14px;
}

.feedback-list {
  display: grid;
  gap: 11px;
}

.feedback-card {
  padding: 18px;

  border: 1px solid var(--line);
  border-radius: 13px;

  background: #fff;
}

.feedback-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
}

.feedback-card-head span {
  color: var(--primary);
  font-size: 12px;
}

.feedback-card p {
  margin: 11px 0;

  color: var(--text-soft);
  line-height: 1.65;
  font-size: 13px;

  white-space: pre-wrap;
}

.feedback-card small {
  color: var(--text-faint);
}

.empty-inline {
  padding: 32px;

  border: 1px solid var(--line);
  border-radius: 13px;

  color: var(--text-soft);
  background: #fff;

  text-align: center;
}


@media (max-width: 900px) {

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

  .feedback-layout {
    grid-template-columns: 1fr;
  }
}


@media (max-width: 620px) {

  .order-card {
    grid-template-columns: 1fr;
  }
}