:root {
  --green: #2da247;
  --green-dark: #137d2f;
  --green-soft: #edf8f0;
  --ink: #203024;
  --muted: #66716a;
  --line: #d7e9dc;
  --paper: #ffffff;
  --page: min(1180px, calc(100vw - 40px));
  --font-default: "Aa大标宋", "Aa DaBiaoSong", "FZDaBiaoSong-B06S", "FZDaBiaoSongS-B-GB", "FangZhengDaBiaoSongJianTi", "方正大标宋简体", "方正大标宋_GBK", "方正大标宋", "STSong", "Songti SC", serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(180deg, rgba(247, 251, 248, 0.94), rgba(247, 251, 248, 0.98)),
    url("assets/hero-airplane.jpg") center / cover fixed;
  color: var(--ink);
  font-family: var(--font-default);
}

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

.login-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: var(--page);
  margin: 0 auto;
  padding: 22px 0;
}

.login-header img {
  display: block;
  width: clamp(190px, 18vw, 246px);
  height: auto;
}

.login-header nav a,
.login-footer a {
  color: var(--green-dark);
  font-size: 15px;
  font-weight: 900;
}

.login-shell {
  width: var(--page);
  margin: 0 auto;
  padding: 52px 0 76px;
}

.login-hero {
  max-width: 760px;
  margin: 0 auto 36px;
  text-align: center;
}

.login-hero span {
  display: block;
  color: var(--green);
  font-size: 18px;
  font-weight: 900;
}

.login-hero h1 {
  margin: 12px 0 0;
  color: var(--green-dark);
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.08;
}

.login-hero p {
  margin: 18px auto 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.platform-login-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.platform-login-card {
  display: grid;
  gap: 16px;
  align-content: start;
  min-height: 272px;
  padding: 24px;
  border: 1px solid rgba(45, 162, 71, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 20px 50px rgba(24, 80, 39, 0.08);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.platform-login-card:hover {
  transform: translateY(-2px);
  border-color: rgba(45, 162, 71, 0.36);
  box-shadow: 0 24px 62px rgba(24, 80, 39, 0.14);
}

.platform-login-card img {
  width: 150px;
  max-width: 100%;
  height: 72px;
  object-fit: contain;
  object-position: left center;
}

.platform-login-card h2 {
  margin: 0;
  color: var(--green-dark);
  font-size: 24px;
}

.platform-login-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.platform-login-card strong {
  align-self: end;
  margin-top: auto;
  color: var(--green);
  font-size: 16px;
}

.platform-login-card.is-disabled {
  cursor: default;
  opacity: 0.72;
}

.platform-login-card.is-disabled strong {
  color: var(--muted);
}

.login-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: var(--page);
  margin: 0 auto;
  padding: 24px 0 34px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.platform-toast {
  position: fixed;
  right: 22px;
  bottom: 22px;
  max-width: min(360px, calc(100vw - 44px));
  padding: 14px 18px;
  border-radius: 8px;
  background: #1d2a20;
  color: #fff;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.22);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.platform-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .platform-login-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .login-header,
  .login-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .platform-login-grid {
    grid-template-columns: 1fr;
  }
}