:root {
  --bg-primary: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #e2e8f0;
  --accent-blue: #2563eb;
  --correct-bg: #dcfce7;
  --correct-border: #16a34a;
  --correct-text: #14532d;
  --wrong-bg: #fee2e2;
  --wrong-border: #dc2626;
  --wrong-text: #7f1d1d;
}

[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --card-bg: #151d2a;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border-color: #263346;
  --accent-blue: #3b82f6;
  --correct-bg: #064e3b;
  --correct-border: #10b981;
  --correct-text: #ecfdf5;
  --wrong-bg: #7f1d1d;
  --wrong-border: #ef4444;
  --wrong-text: #fef2f2;
}

.enp-practice-container { max-width: 1000px; margin: 0 auto; padding: 20px; background: var(--bg-primary); color: var(--text-primary); }
.enp-utility-bar { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; }
.btn-theme { padding: 6px 12px; border-radius: 20px; border: 1px solid var(--border-color); background: var(--card-bg); color: var(--text-primary); cursor: pointer; }
.enp-lang-toggle { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 20px; padding: 2px; }
.lang-btn { padding: 4px 12px; border-radius: 16px; border: none; cursor: pointer; background: transparent; color: var(--text-primary); }
.lang-btn.active { background: var(--accent-blue); color: #fff; }

.enp-breadcrumbs { font-size: 14px; margin-bottom: 15px; color: var(--text-secondary); }
.enp-breadcrumbs a { color: var(--accent-blue); text-decoration: none; }

.enp-seo-intro { background: var(--card-bg); padding: 20px; border-radius: 12px; margin-bottom: 25px; border: 1px solid var(--border-color); }

.enp-ad-slot { text-align: center; margin: 20px 0; }

.enp-card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; list-style: none; padding: 0; }
.enp-card-grid a { display: block; padding: 12px 16px; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 10px; color: var(--text-primary); text-decoration: none; }
.enp-card-grid a:hover { border-color: var(--accent-blue); }

.enp-sample-card { border: 1px solid var(--border-color); background: var(--card-bg); padding: 15px; margin-bottom: 15px; border-radius: 8px; }
.enp-sample-card .badge { background: #0056b3; color: #fff; padding: 3px 8px; border-radius: 4px; font-size: 12px; }
.enp-q-text { font-weight: 600; margin-top: 10px; }
.enp-q-hi { color: var(--text-secondary); font-weight: normal; }
.sample-options { font-size: 14px; margin-left: 15px; }

.enp-interactive-section { margin: 30px 0; }
.enp-loading { color: var(--text-secondary); }
.enp-progress { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.enp-question-text { font-size: 17px; font-weight: 600; margin-bottom: 14px; }

.enp-option-btn { width: 100%; min-height: 52px; padding: 12px 16px; margin-bottom: 10px; background: var(--card-bg); border: 2px solid var(--border-color); border-radius: 12px; color: var(--text-primary); font-size: 15px; text-align: left; cursor: pointer; transition: all 0.2s ease; display: block; }
.enp-option-btn:disabled { cursor: default; }
.enp-option-btn.correct { background-color: var(--correct-bg) !important; border-color: var(--correct-border) !important; color: var(--correct-text) !important; }
.enp-option-btn.wrong { background-color: var(--wrong-bg) !important; border-color: var(--wrong-border) !important; color: var(--wrong-text) !important; }

.enp-explanation { margin-top: 12px; padding: 12px; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; }
.enp-nav { display: flex; justify-content: space-between; margin-top: 16px; }
.enp-nav button { padding: 10px 18px; border-radius: 10px; border: 1px solid var(--border-color); background: var(--accent-blue); color: #fff; cursor: pointer; }
.enp-nav button:disabled { opacity: 0.4; cursor: default; }

.enp-interlinking-hub { margin-top: 40px; padding-top: 20px; border-top: 2px solid var(--border-color); }

.enp-infeed-ad-wrapper { margin: 16px 0; }

@media (max-width: 480px) {
  .enp-practice-container { padding: 12px; }
  .enp-question-text { font-size: 16px; }
}