/* Base Styles */
:root {
    --primary: #000000;
    --secondary: #FFFFFF;
    --accent: #E6E6E6;
    --text: #333333;
    --font-primary: "Monomakh", "Noto Serif TC", serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-primary);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
}

.logo {
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--secondary);
    color: var(--text);
    line-height: 1.6;
    background-image: url('img/bg-gray-texture.jpg');
    background-repeat: repeat;
    background-attachment: fixed;
    background-size: 50px 50px;
    font-size: var(--font-size-base);
    font-weight: 400;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.6);
    padding: 20px 40px;
    z-index: 1000;
    transition: all 0.3s ease;
}

header.scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

/* Sections */
section {
    padding: 100px 40px;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    font-weight: 600;
    letter-spacing: 2px;
    font-size: var(--font-size-2xl);
}

.highlight-title {
    color: var(--primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 2rem 0;
    text-align: center;
    position: relative;
    padding-bottom: 0.5rem;
}

.highlight-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background-color: var(--primary);
}

/* About Section */
.about {
    background-color: rgba(255, 255, 255, 0.6);
    padding: 150px 40px;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.about-text {
    flex: 1;
    position: relative;
}

.about-text .btn {
    margin-top: 20px;
    position: relative;
    left: 50%;
    transform: translateX(-50%);
}

.about-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-image img {
    max-width: 80%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary);
    color: var(--secondary);
    text-decoration: none;
    border: 1px solid var(--primary);
    transition: all 0.3s ease;
    font-size: var(--font-size-base);
    font-weight: 500;
    letter-spacing: 1px;
    border-radius: 50px;
}

.btn:hover {
    background-color: transparent;
    color: var(--primary);
}

/* Footer */
.white-footer {
    background-color: rgba(255, 255, 255, 0.6);
    color: var(--text);
    padding: 60px 40px;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.copyright {
    font-size: var(--font-size-sm);
    font-weight: 400;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .about-content {
        flex-direction: column;
    }
    
    .about-image {
        height: auto;
        margin-bottom: 30px;
    }
    
    .about-image img {
        width: 80%;
        height: auto;
        max-width: 400px;
        border-radius: 20px;
    }
    
    section {
        padding: 80px 20px;
    }
    
    .about {
        padding: 120px 20px 80px;
    }
    
    .section-title {
        font-size: var(--font-size-xl);
        margin-bottom: 40px;
    }
    
    header {
        padding: 15px 20px;
    }
    
    .logo {
        font-size: var(--font-size-lg);
    }
    
    .highlight-title {
        font-size: var(--font-size-lg);
    }
    
    .about-text p {
        font-size: var(--font-size-base);
    }
    
    blockquote {
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    .about-image img {
        width: 80%;
        border-radius: 15px;
    }
    
    .section-title {
        font-size: var(--font-size-lg);
        margin-bottom: 30px;
    }
    
    .about-text p {
        font-size: var(--font-size-sm);
    }
    
    .btn {
        font-size: var(--font-size-sm);
    }
    
    .about {
        padding: 100px 15px 60px;
    }
    
    section {
        padding: 60px 15px;
    }
    
    blockquote {
        font-size: var(--font-size-sm);
    }
}

@media (min-width: 768px) {
    .about-content {
        flex-direction: row;
        align-items: center;
        padding: 0 40px;
    }
    
    .about-image {
        flex: 1;
    }
    
    .about-text {
        flex: 1;
    }
}

/* 確保圖片在所有設備上都能正確顯示 */
img {
    max-width: 100%;
    height: auto;
}

/* 改善在小螢幕上的觸控體驗 */
@media (hover: none) {
    .btn {
        padding: 14px 30px; /* 增加按鈕大小以便於觸控 */
    }
}

.about-text p {
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

/* Key terms styling */
.key-term {
    white-space: nowrap;
    display: inline-block;
}

/* Blockquote styling */
blockquote {
    position: relative;
    padding-left: 20px;
    margin: 20px 0;
    font-size: var(--font-size-lg);
    line-height: 1.8;
    font-weight: 400;
}

blockquote::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--primary);
}

blockquote p {
    font-style: italic;
    margin-bottom: 0;
}