:root {
    --bg-color: #0f172a; --surface-color: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1); --text-primary: #f8fafc;
    --text-secondary: #94a3b8; --accent-color: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.4); --success-color: #10b981;
    --warning-color: #f59e0b; --danger-color: #ef4444; --glass-blur: blur(12px);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Inter', sans-serif; background-color: var(--bg-color);
    color: var(--text-primary); line-height: 1.6; min-height: 100vh;
    display: flex; justify-content: center;
    background-image: radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%), radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.15), transparent 25%); background-attachment: fixed;
}
.app-container { max-width: 900px; width: 100%; padding: 2rem; }
header { text-align: center; margin-bottom: 2rem; animation: fadeInDown 0.8s ease-out; }
h1 { font-size: 3rem; font-weight: 700; margin-bottom: 0.5rem; letter-spacing: -1px; }
h1 span { color: var(--accent-color); text-shadow: 0 0 20px var(--accent-glow); }
header p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 2rem; }
.search-container { display: flex; gap: 1rem; justify-content: center; max-width: 600px; margin: 0 auto; }
#url-input { flex: 1; padding: 1rem 1.5rem; border-radius: 12px; border: 1px solid var(--border-color); background: var(--surface-color); color: white; font-size: 1.1rem; outline: none; transition: border-color 0.3s; }
#url-input:focus { border-color: var(--accent-color); box-shadow: 0 0 10px var(--accent-glow); }
.btn-primary { padding: 1rem 2rem; border-radius: 12px; background: var(--accent-color); color: white; font-size: 1.1rem; font-weight: 600; border: none; cursor: pointer; transition: all 0.3s; box-shadow: 0 0 15px var(--accent-glow); }
.btn-primary:hover { background: #2563eb; transform: translateY(-2px); }
.btn-primary:disabled { opacity: 0.7; cursor: not-allowed; }
.hidden { display: none !important; }
#loading { text-align: center; margin: 4rem 0; }
.spinner { width: 50px; height: 50px; border: 4px solid var(--border-color); border-top-color: var(--accent-color); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 1rem; }
@keyframes spin { to { transform: rotate(360deg); } }
.score-card { background: var(--surface-color); backdrop-filter: var(--glass-blur); border: 1px solid var(--border-color); border-radius: 16px; padding: 1.5rem; margin-bottom: 2rem; text-align: center; animation: fadeInUp 0.5s ease-out; }
.score-metrics { display: flex; justify-content: center; gap: 2rem; margin-top: 1rem; }
.metric { display: flex; flex-direction: column; align-items: center; }
.metric-value { font-size: 2.5rem; font-weight: 700; }
.metric-label { font-size: 0.9rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }
.text-success { color: var(--success-color); text-shadow: 0 0 10px rgba(16, 185, 129, 0.4); }
.text-warning { color: var(--warning-color); text-shadow: 0 0 10px rgba(245, 158, 11, 0.4); }
.text-danger { color: var(--danger-color); text-shadow: 0 0 10px rgba(239, 68, 68, 0.4); }
.results-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }
.result-card { background: var(--surface-color); backdrop-filter: var(--glass-blur); border: 1px solid var(--border-color); border-radius: 12px; padding: 1.5rem; animation: fadeInUp 0.5s ease-out backwards; }
.result-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.status-icon { width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 1rem; }
.status-pass { background: rgba(16, 185, 129, 0.2); color: var(--success-color); border: 1px solid var(--success-color); }
.status-warning { background: rgba(245, 158, 11, 0.2); color: var(--warning-color); border: 1px solid var(--warning-color); }
.status-fail { background: rgba(239, 68, 68, 0.2); color: var(--danger-color); border: 1px solid var(--danger-color); }
.result-title { font-weight: 600; font-size: 1.1rem; }
.result-desc { color: var(--text-secondary); font-size: 0.95rem; }
.error-message { background: rgba(239, 68, 68, 0.1); color: var(--danger-color); border: 1px solid var(--danger-color); padding: 1rem; border-radius: 8px; text-align: center; margin-top: 2rem; font-weight: 500; }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }