:root {
  --text: #172033;
  --muted: #6c7384;
  --line: rgba(255, 255, 255, 0.48);
  --panel: rgba(255, 255, 255, 0.76);
  --panel-strong: rgba(255, 255, 255, 0.9);
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --shadow: 0 24px 70px rgba(23, 32, 51, 0.2);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: url("./beijingtutuya.webp") center / cover no-repeat fixed;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.34) 0%, rgba(255, 255, 255, 0.08) 44%, rgba(255, 255, 255, 0) 100%),
    rgba(8, 16, 32, 0.08);
}

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

button,
input {
  font: inherit;
}

.page-shell {
  position: relative;
  min-height: 100vh;
  padding: 72px clamp(20px, 4vw, 64px) 42px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  padding: 8px clamp(20px, 4vw, 64px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.82);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 10px 30px rgba(23, 32, 51, 0.08);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
}

.brand {
  display: inline-flex;
  align-items: center;
  margin-left: clamp(0px, 4vw, 78px);
  min-width: 160px;
}

.brand-logo {
  display: block;
  width: auto;
  height: 48px;
  max-width: 250px;
  object-fit: contain;
}

.nav-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(37, 99, 235, 0.14);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.72);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  border-radius: 999px;
  background: #273249;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

body.nav-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

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

.nav-tabs a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 68px;
  padding: 9px 12px;
  border-radius: 6px;
  color: #273249;
  font-size: 14px;
  text-align: center;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-icon {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
}

.nav-tabs .nav-warning {
  min-width: auto;
  color: #dc2626;
  background: transparent;
}

.warning-marquee {
  display: block;
  max-width: 17em;
  overflow: hidden;
  white-space: nowrap;
}

.warning-track {
  display: inline-flex;
  align-items: center;
  width: max-content;
  will-change: transform;
}

.warning-text {
  display: inline-block;
  flex: 0 0 auto;
  padding-right: 2ch;
}

.warning-marquee.is-scrolling .warning-track {
  animation: warning-scroll 14s linear infinite;
  animation-delay: 1.5s;
  animation-fill-mode: both;
}

@keyframes warning-scroll {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(-50%);
  }
}

.nav-tabs a:hover {
  color: var(--accent);
  background: rgba(255, 255, 255, 0.64);
}

.nav-tabs .nav-warning:hover {
  color: #b91c1c;
  background: transparent;
}

.mobile-warning {
  display: none;
}

.auth-panel {
  width: min(392px, calc(100vw - 40px));
  margin-top: clamp(62px, 9vh, 96px);
  margin-left: clamp(0px, 4vw, 78px);
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.56);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 24px 70px rgba(18, 34, 68, 0.18);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
}

.auth-copy {
  margin: 0 0 20px;
}

.auth-copy h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0;
}

.title-animate {
  animation: fade-in-up 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fade-in-up {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: grid;
  gap: 14px;
  animation: fade-in-up 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.field {
  display: grid;
  gap: 9px;
}

.field > span:first-child {
  color: #17191d;
  font-size: 14px;
  font-weight: 400;
}

.input-shell {
  display: flex;
  align-items: center;
  width: 100%;
  height: 48px;
  border: 1.5px solid rgba(255, 255, 255, 0.66);
  border-radius: 10px;
  padding: 0 12px;
  background: rgba(248, 251, 255, 0.82);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-shell:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.input-shell input {
  width: 100%;
  height: 100%;
  min-width: 0;
  border: 0;
  outline: none;
  padding: 0 0 0 12px;
  color: #17191d;
  font-size: 15px;
  background: transparent;
}

.input-shell input::placeholder {
  color: #8a8f98;
  font-size: 15px;
}

.field-icon {
  display: inline-flex;
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  align-items: center;
  justify-content: center;
  color: #111417;
}

.password-toggle {
  display: inline-flex;
  width: 32px;
  height: 100%;
  flex: 0 0 32px;
  align-items: center;
  justify-content: center;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s ease;
}

.password-toggle:hover {
  opacity: 1;
}

.password-toggle img {
  width: 20px;
  height: 20px;
  display: block;
}

.password-toggle img[hidden] {
  display: none;
}

.field-icon img {
  width: 22px;
  height: 22px;
  display: block;
}

.code-field {
  gap: 0;
}

.code-button {
  flex: 0 0 96px;
  height: 32px;
  min-width: 96px;
  margin-left: 10px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(37, 99, 235, 0.1);
  font-size: 13px;
  font-weight: 400;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.code-button:hover:not(:disabled) {
  border-color: rgba(37, 99, 235, 0.36);
  color: #ffffff;
  background: var(--accent);
}

.code-button:disabled {
  border-color: rgba(138, 146, 163, 0.22);
  color: #7b8190;
  background: rgba(138, 146, 163, 0.12);
  cursor: not-allowed;
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 2px;
}

.checkbox-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #17191d;
  font-size: 14px;
  line-height: 1;
}

.checkbox-line input {
  position: relative;
  display: inline-grid;
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
  place-items: center;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  border: 1.5px solid #7b8190;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.86);
  cursor: pointer;
}

.checkbox-line input:checked {
  border-color: var(--accent);
  background: var(--accent);
}

.checkbox-line input:checked::after {
  width: 8px;
  height: 4px;
  content: "";
  border: 2px solid #ffffff;
  border-top: 0;
  border-right: 0;
  transform: translateY(-1px) rotate(-45deg);
}

.checkbox-line > span {
  display: inline-flex;
  align-items: center;
  min-height: 16px;
}

.agreement {
  align-items: center;
}

.text-link {
  color: var(--accent);
  font-size: 14px;
  font-weight: 400;
}

.text-link:hover {
  color: var(--accent-dark);
}

.form-message {
  margin: 0;
  color: #dc2626;
  font-size: 13.5px;
  line-height: 1.45;
}

.form-message[hidden] {
  display: none;
}

.primary-button {
  width: 100%;
  height: 50px;
  margin-top: 10px;
  border: 0;
  border-radius: 10px;
  color: #ffffff;
  font-size: 17px;
  font-weight: 600;
  background: var(--accent);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.primary-button:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.primary-button:active {
  transform: translateY(0);
}

.switch-line {
  margin: 2px 0 0;
  color: #17191d;
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
}

.mode-link {
  border: 0;
  padding: 0 0 0 6px;
  color: var(--accent);
  background: transparent;
  font-weight: 400;
  cursor: pointer;
}

.site-footer {
  position: fixed;
  right: 18px;
  bottom: 14px;
  left: 18px;
  color: rgba(23, 32, 51, 0.62);
  font-size: 13px;
  line-height: 1.5;
  text-align: center;
  pointer-events: none;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  padding: 20px;
}

.modal-overlay[hidden] {
  display: none;
}

.modal-content {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  animation: fade-in-up 0.3s ease forwards;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid #eef0f3;
}

.modal-tabs {
  display: flex;
  gap: 24px;
}

.modal-tab {
  background: transparent;
  border: 0;
  padding: 18px 0;
  font-size: 16px;
  font-weight: 500;
  color: #6c7384;
  cursor: pointer;
  position: relative;
  transition: color 0.2s ease;
}

.modal-tab:hover {
  color: #17191d;
}

.modal-tab.active {
  color: var(--accent);
}

.modal-tab.active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px 2px 0 0;
}

.modal-header h2 {
  display: none;
}

.modal-body {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
  font-size: 14px;
  line-height: 1.6;
  color: #4a4f5c;
  white-space: pre-wrap;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid #eef0f3;
  background: #fafbfe;
}

.modal-btn {
  padding: 10px 16px;
  background: transparent;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  color: #4b5563;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.modal-btn:hover {
  background: #f3f4f6;
  color: #17191d;
}

.text-danger {
  color: #dc2626;
  font-weight: 700;
}

@media (max-width: 760px) {
  body {
    background-position: center;
  }

  body::before {
    background: rgba(255, 255, 255, 0.2);
  }

  .page-shell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 64px 18px 100px;
  }

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    min-height: auto;
    padding: 10px 14px;
  }

  .brand {
    margin-left: 0;
    min-width: auto;
  }

  .brand-logo {
    height: 42px;
    max-width: 190px;
  }

  .nav-toggle {
    display: block;
    border: 0;
    background: transparent;
  }

  .nav-tabs {
    position: fixed;
    top: 70px;
    right: 14px;
    z-index: 20;
    display: grid;
    width: min(300px, calc(100vw - 28px));
    gap: 8px;
    padding: 14px;
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 22px 56px rgba(23, 32, 51, 0.18);
    backdrop-filter: blur(18px) saturate(150%);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
    opacity: 0;
    pointer-events: none;
    transform: translateX(18px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  body.nav-open .nav-tabs {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(0);
  }

  .nav-tabs a {
    justify-content: flex-start;
    width: 100%;
    min-width: 0;
    padding: 12px 14px;
    text-align: left;
  }

  .nav-tabs .nav-warning {
    display: none;
  }

  .mobile-warning {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    margin: 0 0 15px;
    padding: 8px 12px;
    color: #dc2626;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 8px;
    font-size: 15.5px;
    line-height: 1.35;
  }

  .mobile-warning .warning-marquee {
    flex: 1;
    max-width: none;
  }

  .mobile-warning .warning-text {
    font-size: 15.5px;
  }

  .input-shell input,
  .input-shell input::placeholder {
    font-size: 17px;
  }

  .auth-panel {
    width: 100%;
    margin: 15px 0 0;
    padding: 20px;
  }

  .auth-copy h1 {
    font-size: 22px;
  }

  .form-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }

  .code-field {
    grid-template-columns: 1fr;
  }

  .site-footer {
    bottom: 10px;
    font-size: 12px;
  }
}