:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e4e7ec;
  --text: #1f2733;
  --muted: #6b7280;
  --primary: #07c160;
  --primary-dark: #06ad56;
  --danger: #e5484d;
  --shadow-lg: 0 10px 30px rgba(16, 24, 40, 0.16);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 30px 28px;
}

.logo { font-size: 40px; text-align: center; }
h1 { margin: 8px 0 0; font-size: 20px; text-align: center; }
.sub { margin: 4px 0 22px; font-size: 13px; color: var(--muted); text-align: center; }

label {
  display: block;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--muted);
}
input[type="text"],
input[type="password"] {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
}
input:focus { outline: none; border-color: var(--primary); }

.btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 11px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 15px;
  width: 100%;
  transition: all 0.15s;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.error {
  margin: 0 0 12px;
  padding: 9px 12px;
  border-radius: 8px;
  background: #fdecec;
  color: var(--danger);
  font-size: 13px;
}
.error[hidden] { display: none; }

.hint {
  margin: 16px 0 0;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}