:root {
    --primary-color: #E5322D; /* Classic iLovePDF Red */
    --primary-hover: #C92A26;
    --bg-color: #F3F4F5; /* Standard light grey background */
    --card-bg: #FFFFFF;
    --text-main: #333333; /* Dark grey for headings */
    --text-muted: #555555; /* Medium grey for descriptions */
    --border-color: #EAEAEA;
    --shadow-default: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.12);
    --transition: all 0.25s ease-in-out;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--card-bg);
    padding: 15px 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.main-nav {
    display: flex;
    gap: 20px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
}

.main-nav a:hover {
    color: var(--primary-color);
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo i {
    color: var(--primary-color);
    font-size: 26px;
}

.logo span {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 20px 50px;
}

.hero h1 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-main);
    letter-spacing: -1px;
}

.hero p {
    font-size: 20px;
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto;
    font-weight: 400;
    line-height: 1.5;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    max-width: 900px; /* Smaller to accompany text */
    margin: 0 auto;
    padding: 0 20px 80px;
}

.tool-hide {
    --primary-color: #E5322D; /* Red */
}

.tool-extract {
    --primary-color: #27AE60; /* Green */
}

.tool-reveal {
    --primary-color: #1A5276; /* Dark Blue */
}

.tool-card {
    background: var(--card-bg);
    padding: 30px 20px;
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-default);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.tool-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: center;
}

.tool-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
    border-color: transparent;
}

.tool-card:hover::after {
    transform: scaleX(1);
}

.tool-icon {
    position: relative;
    font-size: 50px;
    color: var(--primary-color);
    margin-bottom: 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.tool-card:hover .tool-icon {
    transform: scale(1.05);
}

.icon-badge {
    position: absolute;
    bottom: -5px;
    right: -10px;
    background-color: var(--card-bg);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
}

.icon-badge i {
    font-size: 16px;
    color: var(--text-main);
}

.tool-card h3 {
    color: var(--text-main);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.tool-card p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
}

/* Info Section */
.info-section {
    padding: 80px 20px;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

.info-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
}

.info-intro h2 {
    font-size: 32px;
    color: var(--text-main);
    margin-bottom: 15px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.info-intro p {
    font-size: 18px;
    color: var(--text-muted);
    line-height: 1.6;
}

.info-intro p strong {
    color: var(--text-main);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1140px;
    margin: 0 auto;
}

.info-card {
    background-color: var(--bg-color);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.info-card:hover {
    box-shadow: var(--shadow-default);
    transform: translateY(-2px);
}

.info-icon {
    font-size: 28px;
    color: #1A5276;
    margin-bottom: 20px;
    display: block;
}

.info-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-main);
}

.info-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.info-card ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 10px;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.5;
}

.info-card ul li::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    left: 0;
    top: 2px;
    color: #27AE60;
    font-size: 12px;
}

.info-card p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
}

.info-card-wide {
    grid-column: 1 / -1;
    background-color: #F8FAFC;
    border-left: 4px solid var(--primary-color);
}

/* Footer */
.footer {
    margin-top: auto;
    background-color: #0B192C; /* Dark blue */
    border-top: none;
    padding: 40px 0 20px;
    text-align: center;
    color: #A0ABC0;
    font-size: 14px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #E2E8F0;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: #FFFFFF;
}

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .main-nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .hero h1 {
        font-size: 32px;
    }
    
    .hero p {
        font-size: 18px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
}