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

:root {
    --primary-color: #ff6b35;
    --secondary-color: #f7931e;
    --dark-color: #1a1a1a;
    --text-color: #333;
    --light-text: #666;
    --border-color: #ddd;
    --light-bg: #f9f9f9;
    --white: #fff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.main-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 0;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
    justify-content: center;
}

.main-nav li {
    margin: 0;
}

.main-nav a {
    display: block;
    color: #7c3aed;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    padding: 18px 20px;
    transition: all 0.2s ease;
    position: relative;
}

.main-nav a:hover {
    color: var(--white);
    background: #7c3aed;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #a78bfa 0%, #c084fc 50%, #d8b4fe 100%);
    padding: 80px 0;
    text-align: center;
    color: var(--white);
}

.hero-main-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
    line-height: 1.3;
    margin-bottom: 15px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 400;
}

/* Intro Section */
.intro-section {
    padding: 60px 0;
    background: linear-gradient(180deg, #e9d5ff 0%, #f3e8ff 50%, var(--white) 100%);
}

.intro-section .container {
    padding: 0 30px;
}

.highlight-box {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    border: 2px solid #fcd34d;
}

.content-box {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    border: 2px solid #fcd34d;
}

.box-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 15px;
}

.box-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: #7c3aed;
    line-height: 1.3;
    margin-bottom: 20px;
    letter-spacing: -0.4px;
}

.highlight-box p,
.content-box p {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 18px;
}

.highlight-box p:last-child,
.content-box p:last-child {
    margin-bottom: 0;
}

.main-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-color);
    line-height: 1.3;
    margin-bottom: 0;
    letter-spacing: -0.5px;
}

/* Content Sections */
.content-section {
    padding: 60px 0;
    background: linear-gradient(180deg, #f3e8ff 0%, #fae8ff 50%, var(--white) 100%);
}

.content-section .container {
    padding: 0 30px;
}

.content-section.gray-bg {
    background: linear-gradient(180deg, #e9d5ff 0%, #f3e8ff 100%);
}

.content-section h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 25px;
    line-height: 1.3;
    letter-spacing: -0.5px;
}

.content-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-color);
    margin: 35px 0 15px;
    line-height: 1.4;
    letter-spacing: -0.3px;
}

.content-section p {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 18px;
}

.content-section strong {
    font-weight: 600;
    color: var(--dark-color);
}

.cta-button {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    box-shadow: 0 2px 5px rgba(255, 107, 53, 0.2);
}

.cta-button:hover {
    background: #e55a28;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(255, 107, 53, 0.3);
}

.cta-button-large {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 16px 40px;
    font-size: 1.05rem;
    font-weight: 700;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-decoration: none;
    box-shadow: 0 3px 8px rgba(255, 107, 53, 0.25);
}

.cta-button-large:hover {
    background: #e55a28;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 53, 0.35);
}

.cta-center {
    text-align: center;
    margin: 30px 0;
}

.cta-section {
    background: linear-gradient(to bottom, #fff5f0 0%, #ffe8dc 100%);
    border-top: 2px solid var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

/* Featured Card */
.featured-card {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 35px;
    background: var(--white);
    padding: 35px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.featured-image .cover-placeholder {
    width: 220px;
    height: 320px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.15);
}

.cover-image {
    width: 220px;
    height: 320px;
    object-fit: cover;
    border-radius: 5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    display: block;
}

.featured-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark-color);
    margin: 0 0 15px 0;
    letter-spacing: -0.3px;
}

.tags {
    margin-bottom: 15px;
}

.tag-badge {
    display: inline-block;
    background: #fff3ed;
    color: var(--primary-color);
    padding: 5px 14px;
    border-radius: 15px;
    font-size: 0.8125rem;
    margin-right: 7px;
    margin-bottom: 7px;
    border: 1px solid #ffe0d1;
    font-weight: 500;
}

.featured-content p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--light-text);
    margin-bottom: 20px;
}

.stats {
    display: flex;
    gap: 18px;
    margin-bottom: 20px;
    font-size: 0.9375rem;
    color: var(--light-text);
}

.read-button {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    box-shadow: 0 2px 5px rgba(255, 107, 53, 0.2);
}

.read-button:hover {
    background: #e55a28;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(255, 107, 53, 0.3);
}

/* Search Grid */
.search-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.search-item {
    background: var(--white);
    padding: 25px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.search-item:hover {
    border-color: var(--primary-color);
    background: #fff8f5;
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.08);
}

.search-item h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
    letter-spacing: -0.2px;
}

.search-item p {
    font-size: 0.9375rem;
    color: var(--light-text);
    margin: 0;
    line-height: 1.6;
}

/* Chapter List */
.chapter-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chapter-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.chapter-item:hover {
    background: #fff8f5;
    border-color: var(--primary-color);
    transform: translateX(3px);
    box-shadow: 0 2px 6px rgba(255, 107, 53, 0.08);
}

.chapter-title {
    font-weight: 500;
    color: var(--dark-color);
    font-size: 1rem;
    letter-spacing: -0.2px;
}

.chapter-date {
    color: var(--light-text);
    font-size: 0.875rem;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 40px;
    margin-top: 35px;
}

.feature-box {
    text-align: center;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-box h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 8px;
    letter-spacing: -0.2px;
}

.feature-box p {
    font-size: 0.9375rem;
    color: var(--light-text);
    margin: 0;
    line-height: 1.5;
}

/* Footer */
footer {
    background: var(--light-bg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 50px 30px;
    margin-top: 80px;
}

footer .container {
    padding: 0 30px;
}

footer p {
    margin: 15px 0;
    font-size: 0.9375rem;
    color: var(--light-text);
    line-height: 1.7;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

footer a:hover {
    color: #e55a28;
    text-decoration: underline;
}

footer .keywords {
    font-size: 0.875rem;
    color: #999;
    margin-top: 25px;
    line-height: 1.7;
}

footer .keywords a {
    color: var(--primary-color);
    font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .main-nav {
        padding: 0 10px;
    }

    .main-nav ul {
        gap: 0;
    }

    .main-nav a {
        padding: 14px 12px;
        font-size: 0.875rem;
    }

    .hero-section {
        padding: 60px 0;
    }

    .hero-main-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .highlight-box,
    .content-box {
        padding: 30px 25px;
        border-radius: 10px;
    }

    .box-icon {
        font-size: 2rem;
    }

    .box-title {
        font-size: 1.4rem;
    }

    .main-title {
        font-size: 1.75rem;
    }

    .content-section {
        padding: 40px 0;
    }

    .content-section .container {
        padding: 0 20px;
    }

    .content-section h2 {
        font-size: 1.5rem;
    }

    .content-section h3 {
        font-size: 1.25rem;
        margin: 25px 0 12px;
    }

    .content-section p {
        font-size: 1rem;
    }

    .featured-card {
        grid-template-columns: 1fr;
        padding: 25px;
        gap: 25px;
    }

    .featured-image .cover-placeholder {
        width: 200px;
        height: 290px;
        margin: 0 auto;
    }

    .cover-image {
        width: 200px;
        height: 290px;
        margin: 0 auto;
    }

    .search-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .stats {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }

    .chapter-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding: 15px 18px;
    }

    footer {
        padding: 40px 20px;
        margin-top: 60px;
    }

    footer .container {
        padding: 0 20px;
    }
}