:root {
  --login-blue: #176bd6;
  --login-blue-dark: #15569a;
  --login-blue-soft: #eef6ff;
  --login-ink: #172033;
  --login-muted: #64748b;
  --login-line: #d8e3ed;
  --login-canvas: #eef4f7;
}

* { box-sizing: border-box; }

html, body { min-width: 320px; min-height: 100%; margin: 0; }

body {
  min-height: 100vh;
  color: var(--login-ink);
  background: var(--login-canvas);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

a { color: inherit; text-decoration: none; }
button, input { font: inherit; }

.login-header {
  height: 72px;
  background: #fff;
  border-bottom: 1px solid var(--login-line);
  box-shadow: 0 2px 9px rgba(18, 62, 103, .08);
}

.login-header-inner {
  width: min(1180px, calc(100% - 48px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.login-brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.login-brand img {
  width: 52px;
  height: 52px;
  flex: 0 0 auto;
  object-fit: cover;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--login-blue), 0 4px 10px rgba(21, 86, 154, .18);
}

.login-brand span { min-width: 0; display: grid; gap: 3px; }
.login-brand strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 18px; }
.login-brand small { color: var(--login-muted); font-size: 12px; }

.demo-entry {
  flex: 0 0 auto;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 17px;
  color: var(--login-blue);
  border: 1px solid rgba(23, 107, 214, .34);
  border-radius: 5px;
  background: var(--login-blue-soft);
  font-size: 13px;
  font-weight: 700;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.demo-entry:hover { color: #fff; border-color: var(--login-blue); background: var(--login-blue); }

.login-hero {
  position: relative;
  height: 310px;
  overflow: hidden;
  background: #b9d2e7 url("../images/tractor-field-login-hero.png") center 53% / cover no-repeat;
}

.login-hero-shade {
  position: absolute;
  inset: 0;
  background: rgba(21, 86, 154, .27);
}

.login-main {
  position: relative;
  z-index: 2;
  width: min(1040px, calc(100% - 48px));
  min-height: 410px;
  margin: -54px auto 0;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, .88fr);
  overflow: hidden;
  border: 1px solid rgba(216, 227, 237, .95);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 20px 48px rgba(30, 77, 121, .16);
}

.platform-intro {
  padding: 58px 56px 52px;
  border-top: 5px solid var(--login-blue);
}

.intro-kicker {
  display: block;
  margin-bottom: 14px;
  color: var(--login-blue);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.4px;
}

.platform-intro h1 {
  max-width: 540px;
  margin: 0;
  font-size: 29px;
  line-height: 1.42;
  letter-spacing: .3px;
}

.platform-intro p {
  max-width: 570px;
  margin: 22px 0 0;
  color: var(--login-muted);
  font-size: 14px;
  line-height: 1.95;
  text-align: justify;
}

.intro-tags { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 9px; }
.intro-tags span {
  padding: 7px 11px;
  color: var(--login-blue-dark);
  border: 1px solid #d7e7f7;
  border-radius: 4px;
  background: #f5f9fd;
  font-size: 12px;
  font-weight: 700;
}

.login-card {
  padding: 43px 46px 34px;
  border-left: 1px solid var(--login-line);
  background: #fbfdff;
}

.login-card-head > span { color: var(--login-blue); font-size: 12px; font-weight: 800; }
.login-card-head h2 { margin: 7px 0 0; font-size: 27px; }
.login-card-head p { margin: 9px 0 24px; color: var(--login-muted); font-size: 13px; }

.login-form { display: grid; }
.login-form > label { margin-bottom: 7px; color: #334155; font-size: 13px; font-weight: 700; }

.login-form > input {
  width: 100%;
  height: 44px;
  margin-bottom: 16px;
  padding: 0 13px;
  color: var(--login-ink);
  border: 1px solid #c9d7e4;
  border-radius: 5px;
  outline: 0;
  background: #fff;
  transition: border-color .18s ease, box-shadow .18s ease;
}

.login-form > input:focus {
  border-color: var(--login-blue);
  box-shadow: 0 0 0 3px rgba(23, 107, 214, .11);
}

.login-options {
  min-height: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--login-muted);
  font-size: 12px;
}

.remember-option { display: inline-flex; align-items: center; gap: 7px; cursor: pointer; }
.remember-option input { width: 15px; height: 15px; margin: 0; accent-color: var(--login-blue); }

.forgot-button {
  padding: 0;
  color: var(--login-blue);
  border: 0;
  background: transparent;
  cursor: pointer;
}

.forgot-button:hover { text-decoration: underline; }

.login-error {
  min-height: 20px;
  margin: 5px 0 7px;
  color: #dc2626;
  font-size: 12px;
  line-height: 20px;
}

.login-submit {
  width: 100%;
  height: 44px;
  color: #fff;
  border: 0;
  border-radius: 5px;
  background: var(--login-blue);
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(23, 107, 214, .22);
  transition: background .18s ease, transform .18s ease;
}

.login-submit:hover { background: var(--login-blue-dark); }
.login-submit:active { transform: translateY(1px); }

.demo-account {
  margin: 17px 0 0;
  color: #8a9bad;
  font-size: 11px;
  text-align: center;
}

.login-footer {
  min-height: 76px;
  display: grid;
  place-items: center;
  padding: 20px 24px;
  color: #7b8b9c;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 820px) {
  .login-header { height: auto; min-height: 68px; }
  .login-header-inner { width: calc(100% - 28px); padding: 9px 0; }
  .login-brand strong { font-size: 15px; }
  .login-brand small { display: none; }
  .login-hero { height: 250px; }
  .login-main { width: calc(100% - 28px); grid-template-columns: 1fr; margin-top: -34px; }
  .platform-intro { padding: 38px 34px 34px; }
  .platform-intro h1 { font-size: 24px; }
  .login-card { padding: 34px; border-top: 1px solid var(--login-line); border-left: 0; }
}

@media (max-width: 520px) {
  .login-brand img { width: 44px; height: 44px; }
  .login-brand strong { font-size: 13px; white-space: normal; line-height: 1.35; }
  .demo-entry { padding: 0 10px; font-size: 11px; }
  .login-hero { height: 190px; }
  .platform-intro, .login-card { padding: 30px 24px; }
  .platform-intro h1 { font-size: 21px; }
  .platform-intro p { line-height: 1.75; text-align: left; }
}