:root {
  --bg: #f0f2f5;
  --card: #ffffff;
  --text: #1a1a2e;
  --text-sub: #64748b;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --border: #e2e8f0;
  --danger: #ef4444;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 16px;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f1f5f9;
  --text-sub: #94a3b8;
  --primary: #818cf8;
  --primary-hover: #6366f1;
  --border: #334155;
  --danger: #f87171;
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  width: 100%;
  max-width: 480px;
  padding: 24px;
}

/* Login */
.login-box {
  background: var(--card);
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow);
  text-align: center;
}

.login-logo { font-size: 64px; margin-bottom: 8px; }
.login-title { font-size: 24px; font-weight: 700; margin-bottom: 4px; }
.login-subtitle { color: var(--text-sub); font-size: 14px; margin-bottom: 32px; }

.form-group { margin-bottom: 16px; text-align: left; }
.form-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-sub); }
.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.form-input:focus { border-color: var(--primary); }

.btn {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 8px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.error-msg { color: var(--danger); font-size: 13px; margin-top: 8px; text-align: center; min-height: 20px; }

.pdl-hint {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.pdl-hint a {
  color: var(--text-sub);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s;
}
.pdl-hint a:hover {
  color: var(--primary);
}

/* Portal */
.portal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
.portal-header h1 { font-size: 22px; }
.portal-actions { display: flex; gap: 8px; }
.icon-btn {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 18px;
  cursor: pointer;
  transition: all 0.2s;
}
.icon-btn:hover { border-color: var(--primary); }

.welcome { color: var(--text-sub); font-size: 14px; margin-bottom: 24px; }

.app-grid { display: flex; flex-direction: column; gap: 12px; }

.app-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  color: var(--text);
}
.app-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.15);
}
.app-icon { font-size: 40px; flex-shrink: 0; }
.app-info { flex: 1; }
.app-name { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.app-desc { font-size: 13px; color: var(--text-sub); }
.app-arrow { font-size: 20px; color: var(--text-sub); }

.footer {
  text-align: center;
  margin-top: 32px;
  font-size: 12px;
  color: var(--text-sub);
}

/* Responsive */
@media (max-width: 520px) {
  .container { padding: 16px; }
  .login-box { padding: 32px 24px; }
}