:root {
  --page-bg: #424a59;
  --brand: #5a80e8;
  --brand-dark: #5278df;
  --panel: #ffffff;
  --field-border: #d9dee8;
  --field-text: #2f3848;
  --muted: #b8bec8;
  --danger: #ed2228;
  --danger-hover: #d9181e;
  --focus: #3d7df3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--field-text);
  background: var(--page-bg);
}

button,
input {
  font: inherit;
}

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}

.login-card {
  width: min(638px, 100%);
  min-height: 494px;
  display: grid;
  grid-template-columns: 284px 1fr;
  overflow: hidden;
  background: var(--panel);
  border-radius: 8px;
  box-shadow: 0 7px 20px rgba(14, 20, 32, 0.3);
}

.brand-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 86px 26px 48px;
  background: linear-gradient(180deg, var(--brand), var(--brand-dark));
  color: #fff;
}

.brand-avatar {
  width: 78px;
  height: 78px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 10px 20px rgba(20, 36, 84, 0.18);
}

.brand-panel h1 {
  margin: 22px 0 48px;
  text-align: center;
  font-size: 27px;
  line-height: 1.56;
  font-weight: 700;
}

.device-art {
  width: 236px;
  max-width: 100%;
  height: auto;
  margin-top: auto;
}

.form-panel {
  display: flex;
  align-items: center;
  padding: 70px 20px 62px;
  background: #fff;
}

.login-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.input-row {
  height: 35px;
  display: flex;
  align-items: center;
  border: 1px solid var(--field-border);
  background: #fff;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}

.input-row:focus-within {
  border-color: var(--focus);
  box-shadow: 0 0 0 2px rgba(61, 125, 243, 0.08);
}

.field-icon {
  width: 36px;
  height: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #c5cad3;
  flex: 0 0 36px;
}

.field-icon svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.field-icon svg rect,
.field-icon svg circle {
  fill: none;
}

.input-row input {
  min-width: 0;
  width: 100%;
  height: 100%;
  border: 0;
  outline: 0;
  color: var(--field-text);
  background: transparent;
  font-size: 13px;
}

.input-row input::placeholder {
  color: var(--muted);
}

.captcha-line {
  display: grid;
  grid-template-columns: 1fr 82px;
  gap: 16px;
  align-items: center;
}

.captcha-input {
  min-width: 0;
}

.captcha-box {
  height: 35px;
  padding: 0 6px;
  border: 0;
  background: transparent;
  color: #111827;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.captcha-box img {
  display: block;
  width: 82px;
  height: 35px;
  object-fit: cover;
}

.captcha-box:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.login-button {
  height: 41px;
  margin-top: 30px;
  border: 0;
  border-radius: 4px;
  color: #fff;
  background: var(--danger);
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.16s ease, transform 0.16s ease;
}

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

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

.form-message {
  min-height: 18px;
  margin: 0;
  color: #d32f2f;
  font-size: 12px;
  line-height: 18px;
}

.form-message.success {
  color: #1f8a4c;
}

.login-card.no-server-ip .brand-panel {
  padding-top: 86px;
}

.login-card.no-server-ip .form-panel {
  padding-top: 92px;
}

.login-card.no-server-ip .login-button {
  margin-top: 32px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 760px) {
  .login-page {
    padding: 24px 16px;
  }

  .login-card {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .brand-panel {
    padding: 34px 24px 28px;
  }

  .brand-panel h1 {
    margin: 18px 0 24px;
    font-size: 24px;
  }

  .device-art {
    width: 210px;
  }

  .form-panel,
  .login-card.no-server-ip .form-panel {
    padding: 30px 22px 26px;
  }

  .captcha-line {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .captcha-box {
    width: 120px;
    text-align: left;
  }
}