/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2D3748;
    --secondary-color: #4A5568;
    --accent-color: #3182CE;
    --light-bg: #F7FAFC;
    --border-color: #E2E8F0;
    --text-primary: #1A202C;
    --text-secondary: #4A5568;
    --success-color: #48BB78;
    --warning-color: #F6AD55;
    --danger-color: #F56565;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: #fff;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

h3 {
    font-size: 1.5rem;
    margin-top: 2rem;
}

h4 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
}

p {
    margin-bottom: 1.25rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #2C5282;
    text-decoration: underline;
}

/* Layout */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header and Navigation */
header {
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s ease;
    text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
}

/* Hero Sections */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5rem 0 4rem;
    text-align: center;
}

.hero h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero .subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
    margin-bottom: 2rem;
}

.hero-small {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 0 2.5rem;
    text-align: center;
}

.hero-small h1 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.hero-small .subtitle {
    font-size: 1.15rem;
    opacity: 0.95;
}

.meta-info {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-size: 0.95rem;
    opacity: 0.9;
}

.meta-info span {
    display: flex;
    align-items: center;
}

/* Content Sections */
.content-section {
    padding: 3rem 0 4rem;
}

article {
    font-size: 1.05rem;
}

/* Special Boxes */
.highlight-box {
    background-color: var(--light-bg);
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 4px;
}

.highlight-box h3 {
    margin-top: 0;
    color: var(--accent-color);
}

.warning-box {
    background-color: #FFF5F5;
    border-left: 4px solid var(--danger-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 4px;
}

.warning-box h3 {
    margin-top: 0;
    color: var(--danger-color);
}

/* Lists */
ul, ol {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

li {
    margin-bottom: 0.75rem;
}

li strong {
    color: var(--primary-color);
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature-card {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.feature-card h3 {
    margin-top: 0;
    font-size: 1.25rem;
    color: var(--accent-color);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background-color: #fff;
    border: 1px solid var(--border-color);
}

thead {
    background-color: var(--light-bg);
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
    color: var(--primary-color);
}

tr:last-child td {
    border-bottom: none;
}

tbody tr:hover {
    background-color: var(--light-bg);
}

.comparison-table {
    overflow-x: auto;
    margin: 2rem 0;
}

.shortcut-list table {
    margin: 2rem 0;
}

/* Pros and Cons */
.pros-cons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.pros, .cons {
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.pros {
    background-color: #F0FFF4;
    border-color: var(--success-color);
}

.cons {
    background-color: #FFF5F5;
    border-color: var(--danger-color);
}

.pros h3 {
    color: var(--success-color);
    margin-top: 0;
}

.cons h3 {
    color: var(--danger-color);
    margin-top: 0;
}

.pros ul, .cons ul {
    margin-left: 0;
    list-style-position: inside;
}

/* User Profiles */
.user-profile {
    background-color: var(--light-bg);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.user-profile p {
    margin-bottom: 1rem;
}

.user-profile p:last-child {
    margin-bottom: 0;
}

/* Rating Box */
.rating-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    margin: 2.5rem 0;
}

.rating-box h3 {
    color: white;
    margin-top: 0;
    font-size: 1.5rem;
}

.stars {
    font-size: 2.5rem;
    margin: 1rem 0;
    color: #FFD700;
}

.rating-text {
    font-size: 1.15rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.rating-box strong {
    font-size: 1.1rem;
}

/* FAQ */
.faq {
    margin: 2rem 0;
}

.faq-item {
    background-color: var(--light-bg);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.faq-item h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    color: var(--accent-color);
}

.faq-item p {
    margin-bottom: 0;
}

/* Final Note */
.final-note {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    margin: 3rem 0;
    border: 1px solid var(--border-color);
}

.final-note h3 {
    margin-top: 0;
}

/* Navigation Footer */
.navigation-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
    gap: 1rem;
}

.prev-page,
.next-page {
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-color);
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.prev-page:hover,
.next-page:hover {
    background-color: #2C5282;
    transform: translateY(-2px);
    text-decoration: none;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 2.5rem 0;
    text-align: center;
    margin-top: 4rem;
}

footer p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.disclaimer {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 1rem 1.5rem;
        gap: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
        font-size: 0.95rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-small h1 {
        font-size: 2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .pros-cons {
        grid-template-columns: 1fr;
    }

    .navigation-footer {
        flex-direction: column;
    }

    table {
        font-size: 0.9rem;
    }

    th, td {
        padding: 0.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0 2.5rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero .subtitle {
        font-size: 1.05rem;
    }

    .meta-info {
        flex-direction: column;
        gap: 0.5rem;
    }

    .content-section {
        padding: 2rem 0 3rem;
    }

    article {
        font-size: 1rem;
    }
}