:root {
  --ink: #14201c;
  --muted: #6d7772;
  --paper: #fbfaf3;
  --soft: #eef4ec;
  --card: rgba(255, 255, 250, 0.86);
  --line: rgba(19, 78, 66, 0.13);
  --green: #0f7669;
  --green-dark: #064d45;
  --gold: #d8b76a;
  --blue: #667eea;
  --purple: #764ba2;
  --shadow: 0 24px 74px rgba(18, 48, 42, 0.13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(216, 183, 106, 0.28), transparent 34%),
    radial-gradient(circle at 92% 6%, rgba(15, 118, 105, 0.18), transparent 32%),
    linear-gradient(180deg, #fffdf7 0%, #f2f5ed 100%);
}

body[data-lang="zh"] [data-lang="en"],
body[data-lang="en"] [data-lang="zh"] {
  display: none;
}

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

.shell {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(20px);
  background: rgba(251, 250, 243, 0.84);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 850;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: white;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  box-shadow: 0 10px 28px rgba(102, 126, 234, 0.26);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-links a,
.lang-toggle button {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 0 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 760;
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
}

.nav-links a:hover,
.lang-toggle button.active {
  color: var(--green-dark);
  background: rgba(15, 118, 105, 0.08);
  border-color: rgba(15, 118, 105, 0.12);
}

.lang-toggle {
  padding: 4px;
  display: flex;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.hero {
  padding: 78px 0 52px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(340px, 0.96fr);
  gap: 46px;
  align-items: center;
}

.eyebrow {
  width: max-content;
  max-width: 100%;
  padding: 8px 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  color: var(--green-dark);
  background: rgba(15, 118, 105, 0.09);
  border: 1px solid rgba(15, 118, 105, 0.14);
  font-size: 13px;
  font-weight: 850;
}

h1 {
  margin: 20px 0 18px;
  max-width: 860px;
  font-size: clamp(44px, 7vw, 84px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 700px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.65;
  font-weight: 520;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 50px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: 999px;
  font-weight: 850;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  color: white;
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  box-shadow: 0 16px 34px rgba(15, 118, 105, 0.28);
}

.button.secondary {
  color: var(--green-dark);
  background: rgba(255, 255, 255, 0.84);
  border-color: var(--line);
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.app-card {
  min-height: 560px;
  padding: clamp(24px, 3.6vw, 42px);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: 40px;
  background: rgba(255, 255, 250, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow);
}

.app-card::before {
  content: "";
  position: absolute;
  inset: -30% -20% auto auto;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: rgba(216, 183, 106, 0.18);
  pointer-events: none;
}

.app-card.tennis::before {
  background: rgba(102, 126, 234, 0.16);
}

.app-card.reading::before {
  background: rgba(15, 118, 105, 0.15);
}

.app-card.tennis-assistant::before {
  background: rgba(216, 183, 106, 0.2);
}

.app-card.notebook::before {
  background: rgba(118, 75, 162, 0.16);
}

.app-card-top {
  position: relative;
}

.app-icon {
  width: 116px;
  height: 116px;
  border-radius: 28px;
  object-fit: cover;
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.18);
}

.app-card h2,
.detail-copy h2,
.section-head h2 {
  margin: 22px 0 12px;
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1;
  letter-spacing: 0;
}

.app-card p,
.section-head p,
.detail-copy p,
.legal-card p,
.support-card p,
.policy-card p,
.admin-panel p,
.admin-card span {
  color: var(--muted);
  line-height: 1.7;
  font-size: 17px;
  font-weight: 520;
}

.backend-login {
  margin-top: 24px;
  padding: 20px;
  display: grid;
  gap: 12px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.backend-login label {
  color: var(--green-dark);
  font-weight: 850;
}

.backend-login input {
  width: 100%;
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 17px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.9);
  font: inherit;
  font-size: 17px;
  outline: none;
}

.backend-login input:focus {
  border-color: rgba(15, 118, 105, 0.42);
  box-shadow: 0 0 0 4px rgba(15, 118, 105, 0.08);
}

.form-note {
  margin: 2px 0 0;
  font-size: 14px !important;
}

code {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(15, 118, 105, 0.08);
  color: var(--green-dark);
}

.app-card-bottom {
  position: relative;
}

.quick-list {
  margin: 22px 0 26px;
  padding: 0;
  display: grid;
  gap: 11px;
  list-style: none;
}

.quick-list li {
  min-height: 50px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  font-weight: 760;
}

.dot {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(216, 183, 106, 0.16);
}

.detail-hero {
  padding: 58px 0 28px;
}

.detail-panel {
  padding: clamp(24px, 4vw, 46px);
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 34px;
  border-radius: 42px;
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
}

.detail-panel.tennis {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(245, 247, 255, 0.78)),
    radial-gradient(circle at 10% 5%, rgba(102, 126, 234, 0.16), transparent 38%);
}

.detail-panel.reading {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(252, 248, 234, 0.78)),
    radial-gradient(circle at 10% 5%, rgba(216, 183, 106, 0.18), transparent 38%);
}

.detail-panel.notebook {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(244, 247, 255, 0.78)),
    radial-gradient(circle at 10% 5%, rgba(118, 75, 162, 0.14), transparent 38%),
    radial-gradient(circle at 92% 18%, rgba(15, 118, 105, 0.12), transparent 34%);
}

.detail-panel .app-icon {
  width: 160px;
  height: 160px;
  border-radius: 36px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 18px 0 24px;
}

.tag {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--green-dark);
  background: rgba(15, 118, 105, 0.09);
  border: 1px solid rgba(15, 118, 105, 0.1);
  font-size: 13px;
  font-weight: 850;
}

section {
  padding: 56px 0;
}

.section-head {
  max-width: 780px;
  margin-bottom: 26px;
}

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

.feature-card,
.support-card,
.legal-card {
  padding: 24px;
  border-radius: 26px;
  background: rgba(255, 255, 250, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.76);
  box-shadow: 0 16px 42px rgba(18, 48, 42, 0.09);
}

.feature-card h3,
.support-card h3,
.legal-card h3 {
  margin: 0 0 10px;
  font-size: 23px;
}

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

.legal-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.7;
  font-weight: 520;
}

.legal-card li + li {
  margin-top: 7px;
}

.admin-panel {
  padding: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-radius: 26px;
  background: rgba(255, 255, 250, 0.8);
  border: 1px solid var(--line);
  box-shadow: 0 16px 42px rgba(18, 48, 42, 0.09);
}

.admin-panel h3,
.policy-card h2 {
  margin: 0 0 8px;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.admin-card {
  min-height: 160px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  border-radius: 24px;
  background: rgba(255, 255, 250, 0.84);
  border: 1px solid var(--line);
  box-shadow: 0 16px 42px rgba(18, 48, 42, 0.08);
}

.admin-card strong {
  color: var(--green-dark);
  font-size: 22px;
}

.admin-card.disabled {
  opacity: 0.62;
  cursor: not-allowed;
}

.legal-hero {
  padding-bottom: 18px;
}

.policy-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.policy-card {
  padding: 26px;
  border-radius: 26px;
  background: rgba(255, 255, 250, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.78);
  box-shadow: 0 16px 42px rgba(18, 48, 42, 0.08);
}

.policy-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.72;
  font-weight: 520;
}

.policy-card li + li {
  margin-top: 8px;
}

.privacy-block {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.footer {
  padding: 42px 0 56px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 22px;
  flex-wrap: wrap;
}

.footer a {
  color: var(--green-dark);
  font-weight: 850;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

@media (max-width: 900px) {
  .nav-inner {
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .hero-grid,
  .app-grid,
  .detail-panel,
  .feature-grid,
  .support-grid,
  .legal-grid,
  .admin-grid,
  .policy-layout {
    grid-template-columns: 1fr;
  }

  .admin-panel {
    align-items: flex-start;
    flex-direction: column;
  }

  .app-card {
    min-height: auto;
  }
}

@media (max-width: 560px) {
  .shell {
    width: min(100% - 24px, 1160px);
  }

  .hero {
    padding: 48px 0 34px;
  }

  .app-card,
  .detail-panel {
    border-radius: 28px;
  }

  .detail-panel .app-icon,
  .app-icon {
    width: 96px;
    height: 96px;
    border-radius: 24px;
  }

  .button {
    width: 100%;
  }
}

.admin-app {
  padding-bottom: 80px;
}

.admin-hero {
  padding: 58px 0 24px;
}

.admin-hero-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.admin-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 0.98;
  color: var(--green-dark);
}

.admin-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.admin-status {
  min-height: 42px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  color: var(--green-dark);
  background: rgba(15, 118, 105, 0.08);
  border: 1px solid rgba(15, 118, 105, 0.15);
  font-weight: 850;
  white-space: nowrap;
}

.admin-login-panel {
  padding: 24px 0 60px;
}

.admin-login-card,
.admin-console,
.admin-editor-card {
  background: rgba(255, 255, 250, 0.9);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.admin-login-card {
  max-width: 760px;
  padding: 30px;
  display: grid;
  gap: 22px;
  border-radius: 28px;
}

.admin-login-card h2,
.admin-main h2,
.admin-editor-card h2 {
  margin: 0 0 8px;
  color: var(--green-dark);
  font-size: 26px;
}

.admin-login-card p,
.admin-main p,
.admin-editor-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.admin-login-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: end;
}

.admin-login-form label,
.admin-config-form label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-weight: 800;
}

.admin-login-form input,
.admin-toolbar input,
.admin-config-form input,
.admin-config-form textarea,
.admin-editor textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--ink);
  font: inherit;
  font-weight: 650;
  outline: none;
}

.admin-login-form input,
.admin-toolbar input,
.admin-config-form input {
  min-height: 48px;
  padding: 0 14px;
}

.admin-message {
  min-height: 22px;
  color: var(--green);
  font-weight: 780;
}

.admin-message.error {
  color: #d97706;
}

.admin-console {
  min-height: 740px;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  border-radius: 30px;
  overflow: hidden;
}

.admin-sidebar {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  border-right: 1px solid var(--line);
  background: rgba(238, 244, 236, 0.72);
}

.admin-sidebar button {
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 14px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-weight: 850;
  text-align: left;
  cursor: pointer;
}

.admin-sidebar button.active {
  color: white;
  background: linear-gradient(135deg, var(--green), var(--green-dark));
}

.admin-sidebar .admin-logout {
  margin-top: auto;
  color: #b45309;
  background: rgba(217, 119, 6, 0.09);
}

.admin-main {
  min-width: 0;
  padding: 26px;
}

.admin-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.admin-toolbar-actions {
  min-width: min(100%, 460px);
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: flex-end;
}

.admin-toolbar-actions .button {
  min-height: 46px;
}

.admin-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.admin-stat-card,
.admin-config-grid,
.admin-table-wrap {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.admin-stat-card {
  padding: 20px;
  border-radius: 20px;
}

.admin-stat-card span {
  display: block;
  color: var(--muted);
  font-weight: 850;
}

.admin-stat-card strong {
  display: block;
  margin-top: 10px;
  color: var(--green);
  font-size: 32px;
  line-height: 1;
}

.admin-table-wrap {
  overflow: auto;
  border-radius: 20px;
}

.admin-table {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
}

.admin-table th,
.admin-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(19, 78, 66, 0.1);
  text-align: left;
  vertical-align: top;
}

.admin-table th {
  color: var(--muted);
  background: rgba(238, 244, 236, 0.9);
  font-size: 13px;
  letter-spacing: 0;
}

.admin-table td {
  color: var(--ink);
  font-size: 14px;
  font-weight: 650;
}

.admin-table button {
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgba(15, 118, 105, 0.18);
  border-radius: 999px;
  color: var(--green-dark);
  background: rgba(15, 118, 105, 0.08);
  font: inherit;
  font-weight: 850;
  cursor: pointer;
}

.admin-json-preview {
  margin: 0;
  max-height: 680px;
  padding: 18px;
  overflow: auto;
  color: #1f2a25;
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
}

.admin-config-grid {
  padding: 22px;
  border-radius: 24px;
}

.admin-config-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.admin-config-form .wide {
  grid-column: 1 / -1;
}

.admin-config-form textarea {
  min-height: 120px;
  padding: 14px;
  resize: vertical;
}

.admin-config-form button {
  width: max-content;
}

.admin-editor {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(8, 32, 27, 0.34);
  backdrop-filter: blur(18px);
}

.admin-editor-card {
  width: min(900px, 100%);
  max-height: min(840px, 92vh);
  padding: 22px;
  display: grid;
  gap: 16px;
  border-radius: 28px;
}

.admin-editor-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.admin-editor-head button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: white;
  color: var(--ink);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
}

.admin-editor textarea {
  min-height: 460px;
  padding: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
}

.admin-editor-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.admin-editor-actions #deleteButton {
  color: #b45309;
}

.admin-empty {
  padding: 32px;
  color: var(--muted);
  font-weight: 800;
}

.hidden {
  display: none !important;
}

@media (max-width: 900px) {
  .admin-hero-inner,
  .admin-toolbar,
  .admin-login-form {
    display: grid;
  }

  .admin-console {
    grid-template-columns: 1fr;
  }

  .admin-sidebar {
    flex-direction: row;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .admin-sidebar button {
    white-space: nowrap;
  }

  .admin-summary-grid,
  .admin-config-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .admin-summary-grid,
  .admin-config-form {
    grid-template-columns: 1fr;
  }

  .admin-toolbar-actions {
    display: grid;
    justify-content: stretch;
  }

  .admin-main {
    padding: 18px;
  }
}