:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #1d252d;
  --muted: #65727f;
  --line: #dde3ea;
  --accent: #0f766e;
  --accent-hover: #0d5f59;
  --err: #dc2626;
  --err-bg: #fef2f2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-wrapper {
  width: 100%;
  max-width: 400px;
  padding: 24px;
}

.login-card {
  background: var(--panel);
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  padding: 40px 36px;
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo {
  width: 52px;
  height: 52px;
  background: var(--accent);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.login-header h1 {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
}

.login-header p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 10px 14px;
  font-size: 15px;
  border: 1.5px solid var(--line);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.15s;
  color: var(--ink);
  background: var(--panel);
}

.form-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.1);
}

.form-group input::placeholder {
  color: #b0b8c1;
}

.form-error {
  min-height: 20px;
  font-size: 13px;
  color: var(--err);
  margin-bottom: 8px;
}

.btn-login {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-login:hover { background: var(--accent-hover); }
.btn-login:active { transform: scale(0.98); }
.btn-login:disabled { opacity: 0.6; cursor: not-allowed; }