.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

html {
  background-color: var(--bg);
  color: var(--text-primary);
  overflow-x: hidden;
  width: 100%;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  background-color: var(--bg);
  color: var(--text-primary);
  overflow-x: hidden;
  width: 100%;
  position: relative;
}


.section-label {
  display: block;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.section-title {
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.12;
  color: var(--text-primary);
}

.section-title em { font-style: normal; font-weight: 700; }

.btn-outline {
  display: inline-block;
  padding: 9px 22px;
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: none;
  cursor: pointer;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
  white-space: nowrap;
  text-decoration: none;
}

.btn-outline:hover {
  border-color: rgba(255, 255, 255, 0.75);
  background-color: rgba(255, 255, 255, 0.04);
}


.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.85s var(--ease-out), transform 0.85s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}


.nav {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: var(--nav-h);
  z-index: 920;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad-x);
  transition: background-color 0.45s var(--ease), border-bottom-color 0.45s;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background-color: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  z-index: 910;
}

.nav-logo img {
  width: clamp(100px, 9vw, 160px);
  height: auto;
  mix-blend-mode: screen;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links .btn-outline {
  padding: 7px 18px;
  font-size: 0.66rem;
  color: var(--text-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px;
  cursor: pointer;
  position: absolute;
  right: var(--pad-x);
  z-index: 910;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background-color: var(--text-primary);
  transition: transform 0.35s var(--ease), opacity 0.35s;
  transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--bg);
  z-index: 910;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 36px;
  transform: translateX(100%);
  transition: transform 0.4s var(--ease);
}

.nav-overlay.open {
  transform: translateX(0);
}

.nav-overlay a {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.nav-overlay a:hover {
  color: var(--text-primary);
}

.nav-overlay .btn-outline {
  margin-top: 12px;
  padding: 10px 28px;
  font-size: 0.74rem;
}


.footer {
  padding: clamp(60px, 8vw, 100px) var(--pad-x) 32px;
  border-top: 1px solid var(--border);
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  gap: 48px;
  margin-bottom: clamp(48px, 6vw, 80px);
}

.footer-brand img {
  width: 160px;
  height: auto;
  margin-bottom: 10px;
  mix-blend-mode: screen;
  display: block;
}

.footer-brand p {
  font-size: 0.7rem;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  font-weight: 400;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}

.footer-nav a {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color 0.3s;
  font-weight: 400;
}

.footer-nav a:hover {
  color: var(--text-primary);
}

.footer-social {
  display: flex;
  gap: 20px;
  justify-content: flex-end;
  align-items: flex-start;
}

.footer-social a {
  color: var(--text-secondary);
  transition: color 0.3s;
  display: flex;
  align-items: center;
}

.footer-social a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.62rem;
  color: rgba(255, 255, 255, 0.22);
  letter-spacing: 0.1em;
}


@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 32px;
  }

  .footer-brand img {
    margin: 0 auto 10px;
  }

  .footer-nav {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 20px;
  }

  .footer-social {
    justify-content: center;
  }
}

.nav-link.active {
  color: var(--text-primary);
}

body.no-scroll {
  overflow: hidden;
}

body.no-scroll #app {
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0; bottom: 0;
  overflow-y: auto;
}

.page-placeholder {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--nav-h);
}

.page-placeholder-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}


.nav-drop-wrap {
  position: relative;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  background: #111111;
  border: 1px solid rgba(255,255,255,0.1);
  min-width: 150px;
  padding: 6px 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
  z-index: 901;
}

.nav-drop-wrap.open .nav-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-item {
  display: block;
  padding: 10px 20px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  transition: color 0.2s, background 0.2s;
}

.nav-dropdown-item:hover {
  color: #ffffff;
  background: rgba(255,255,255,0.05);
}

.nav-link-sub {
  font-size: 0.58rem;
  padding-left: 28px;
  opacity: 0.7;
}

.nav-drop-trigger {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.nav-drop-arrow {
  display: inline-block;
  transition: transform 0.22s ease;
  line-height: 0;
}

.nav-drop-wrap.open .nav-drop-arrow {
  transform: rotate(180deg);
}


.theme-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: color 0.3s;
  flex-shrink: 0;
}

.theme-toggle:hover { color: var(--text-primary); }

.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

[data-theme="light"] nav { color: #111111; }

[data-theme="light"] nav.scrolled {
  background: rgba(242,242,240,0.97);
  box-shadow: 0 1px 0 rgba(0,0,0,0.08);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

[data-theme="light"] .nav-link {
  color: rgba(0,0,0,0.6);
}

[data-theme="light"] .nav-link.active,
[data-theme="light"] .nav-link:hover {
  color: #111111;
}

[data-theme="light"] .nav-logo img { mix-blend-mode: normal; filter: invert(1); }

[data-theme="light"] .nav-toggle span { background: #111111; }

[data-theme="light"] .nav-dropdown {
  background: #ffffff;
  border-color: rgba(0,0,0,0.1);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

[data-theme="light"] .nav-dropdown-item {
  color: rgba(0,0,0,0.6);
}

[data-theme="light"] .nav-dropdown-item:hover {
  color: #111;
  background: rgba(0,0,0,0.04);
}

[data-theme="light"] .nav-overlay {
  background: rgba(255,255,255,0.98);
}

[data-theme="light"] .nav-overlay .nav-link {
  color: #111111;
}

[data-theme="light"] .btn-outline {
  border-color: rgba(0,0,0,0.28);
  color: #111111;
}

[data-theme="light"] .btn-outline:hover {
  background: #111111;
  color: #ffffff;
  border-color: #111111;
}

[data-theme="light"] .section-label { color: rgba(0,0,0,0.45); }
[data-theme="light"] .section-title { color: #111111; }
[data-theme="light"] .section-title em { color: #111111; }

[data-theme="light"] .inbox-tip {
  background: #ffffff;
  border-color: rgba(0,0,0,0.1);
  color: #111111;
}
[data-theme="light"] .inbox-tip-arrow {
  background: #ffffff;
  border-color: rgba(0,0,0,0.1);
}

[data-theme="light"] .login-modal-inner {
  background: #ffffff;
  border-color: rgba(0,0,0,0.1);
}
[data-theme="light"] .login-modal-label,
[data-theme="light"] .login-modal-title { color: #111111; }
[data-theme="light"] .login-modal-desc  { color: #555555; }
[data-theme="light"] .field label       { color: rgba(0,0,0,0.5); }
[data-theme="light"] .field input,
[data-theme="light"] .field textarea {
  border-bottom-color: rgba(0,0,0,0.18);
  color: #111111;
}
[data-theme="light"] .field input::placeholder,
[data-theme="light"] .field textarea::placeholder { color: rgba(0,0,0,0.25); }
[data-theme="light"] .field input:focus,
[data-theme="light"] .field textarea:focus { border-bottom-color: rgba(0,0,0,0.55); }

[data-theme="light"] footer {
  background: transparent;
  border-top-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .footer-bottom p {
  color: rgba(0, 0, 0, 0.35);
}

[data-theme="light"] .footer-brand img {
  filter: invert(1);
  mix-blend-mode: normal;
}