:root {
    --primary: #2563eb;
    --bg: #f3f4f6;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    color: var(--primary);
    margin-bottom: 10px;
}

.input-group {
    display: flex;
    gap: 10px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

input[type="url"] {
    flex: 1;
    padding: 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 16px;
    outline: none;
}

input[type="url"]:focus {
    border-color: var(--primary);
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background-color: #1d4ed8;
}

.hidden {
    display: none !important;
}

.error {
    background-color: #fee2e2;
    color: #b91c1c;
    padding: 15px;
    border-radius: 6px;
    margin-top: 20px;
    text-align: center;
}

.loader {
    text-align: center;
    margin-top: 40px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.results {
    margin-top: 30px;
}

#pageTitle {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.5rem;
}

.section-card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 20px;
    border-left: 5px solid var(--primary);
}

.section-heading {
    margin-top: 0;
    color: #111827;
    font-weight: 700;
}

.section-content p {
    margin-bottom: 10px;
    color: #374151;
}

/* Visual hierarchy for heading levels */
.h1-level { font-size: 1.8em; border-left-color: #2563eb; }
.h2-level { font-size: 1.5em; border-left-color: #3b82f6; }
.h3-level { font-size: 1.3em; border-left-color: #60a5fa; }
.h4-level, .h5-level, .h6-level { font-size: 1.1em; border-left-color: #93c5fd; }