:root {
  --bg-1: #0b1020;
  --bg-2: #131a35;
  --accent: #5be8c5;
  --accent-2: #6ea8ff;
  --text: #e8edf7;
  --muted: #8a93a8;
  --card: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.10);
  --error: #ff6b6b;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei",
          "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 800px at 15% 20%, rgba(91, 232, 197, 0.18), transparent 60%),
    radial-gradient(1000px 700px at 85% 80%, rgba(110, 168, 255, 0.18), transparent 60%),
    linear-gradient(180deg, var(--bg-1), var(--bg-2));
  -webkit-font-smoothing: antialiased;
}

.login-wrap {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 420px;
  padding: 36px 32px 28px;
  background: var(--card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}
.brand-mark {
  font-size: 36px;
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(91, 232, 197, 0.25), rgba(110, 168, 255, 0.25));
  border: 1px solid var(--card-border);
}
.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.brand-sub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.form-title {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 700;
}
.form-tip {
  margin: 0 0 22px;
  font-size: 13px;
  color: var(--muted);
}

.field {
  display: block;
  margin-bottom: 16px;
}
.field-label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
  letter-spacing: 0.3px;
}
.field input {
  width: 100%;
  padding: 12px 14px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color .15s, background .15s;
  font-family: inherit;
}
.field input:focus {
  border-color: var(--accent);
  background: rgba(0, 0, 0, 0.35);
}
.password-row {
  position: relative;
}
.password-row input { padding-right: 44px; }
.toggle-pw {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 16px;
  opacity: 0.6;
  border-radius: 6px;
  transition: opacity .15s, background .15s;
}
.toggle-pw:hover { opacity: 1; background: rgba(255, 255, 255, 0.05); }

.error-msg {
  background: rgba(255, 107, 107, 0.12);
  border: 1px solid rgba(255, 107, 107, 0.4);
  color: var(--error);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 14px;
}

.submit-btn {
  width: 100%;
  padding: 13px 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none;
  border-radius: 10px;
  color: #0b1020;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  transition: transform .1s, opacity .15s;
  font-family: inherit;
}
.submit-btn:hover { opacity: 0.92; }
.submit-btn:active { transform: translateY(1px); }
.submit-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.login-foot {
  margin-top: 22px;
  text-align: center;
}
.hint {
  font-size: 12px;
  color: var(--muted);
}
.hint code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  color: var(--accent);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}