:root {
    --color-bg: #f8f5f0;
    --color-bg-warm: #f5efe6;
    --color-primary: #8b4513;
    --color-primary-light: #a0522d;
    --color-primary-dark: #5d2e0c;
    --color-accent: #c9a959;
    --color-accent-light: #e8d5a3;
    --color-text: #2c2416;
    --color-text-light: #5a4d3a;
    --color-text-muted: #8b7e6a;
    --color-card: #fffdf9;
    --color-border: #d4c9b5;
    --color-shadow: rgba(139, 69, 19, 0.1);
    --color-shadow-dark: rgba(139, 69, 19, 0.2);
    
    --font-serif: 'Noto Serif SC', 'Songti SC', serif;
    --font-display: 'ZCOOL XiaoWei', 'Noto Serif SC', serif;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(180deg, var(--color-bg) 0%, rgba(248, 245, 240, 0.95) 100%);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2rem;
    color: var(--color-accent);
    animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
    0%, 100% { transform: scale(1) rotate(0deg); opacity: 1; }
    50% { transform: scale(1.1) rotate(180deg); opacity: 0.8; }
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: 0.1em;
}

.logo-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    padding-left: 0.5rem;
    border-left: 2px solid var(--color-accent);
}

.nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.nav-btn {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    background: var(--color-card);
    color: var(--color-text-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(201, 169, 89, 0.2), transparent);
    transition: left var(--transition-slow);
}

.nav-btn:hover::before {
    left: 100%;
}

.nav-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow);
}

.nav-btn.active {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: #fff;
    border-color: var(--color-primary);
    box-shadow: 0 4px 15px var(--color-shadow-dark);
}

.main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    text-align: center;
    padding: 4rem 2rem;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--color-bg-warm) 0%, var(--color-bg) 50%, var(--color-bg-warm) 100%);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(201, 169, 89, 0.1) 0%, transparent 50%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--color-primary);
    margin-bottom: 1rem;
    letter-spacing: 0.15em;
    text-shadow: 2px 2px 4px var(--color-shadow);
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 2;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--color-accent);
    font-weight: 600;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
}

.notes-section {
    margin-top: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-primary);
    position: relative;
    padding-left: 1rem;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 70%;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-primary) 100%);
    border-radius: 2px;
}

.search-box {
    position: relative;
}

.search-box input {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    padding: 0.75rem 2.5rem 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-card);
    color: var(--color-text);
    width: 250px;
    transition: all var(--transition-normal);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(201, 169, 89, 0.2);
}

.search-box input::placeholder {
    color: var(--color-text-muted);
}

.search-icon {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    color: var(--color-text-muted);
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.note-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.note-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.note-card:hover::before {
    transform: scaleX(1);
}

.note-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px var(--color-shadow-dark);
    border-color: var(--color-accent-light);
}

.note-card-category {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent) 100%);
    color: var(--color-primary-dark);
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.note-card-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.note-card-excerpt {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.note-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px dashed var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.note-card-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.note-card-reading {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.note-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.note-modal.active {
    display: flex;
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(44, 36, 22, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--color-card);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2.5rem;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.4s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--color-bg);
    color: var(--color-text-muted);
    font-size: 1.5rem;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--color-primary);
    color: #fff;
    transform: rotate(90deg);
}

.modal-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.modal-category {
    display: inline-block;
    font-size: 0.8rem;
    padding: 0.3rem 1rem;
    background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent) 100%);
    color: var(--color-primary-dark);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-weight: 500;
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.modal-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.modal-body {
    font-size: 1rem;
    line-height: 2;
    color: var(--color-text-light);
}

.modal-body p {
    margin-bottom: 1.5rem;
    text-indent: 2em;
}

.modal-body h4 {
    font-family: var(--font-display);
    color: var(--color-primary);
    margin: 2rem 0 1rem;
    padding-left: 1rem;
    border-left: 3px solid var(--color-accent);
}

.modal-body ul, .modal-body ol {
    margin: 1rem 0 1.5rem 2rem;
}

.modal-body li {
    margin-bottom: 0.5rem;
}

.modal-body blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    background: var(--color-bg-warm);
    border-left: 4px solid var(--color-accent);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--color-text);
}

.modal-footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.modal-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    background: var(--color-bg);
    color: var(--color-text-muted);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.footer {
    margin-top: 4rem;
    padding: 3rem 2rem;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-warm) 100%);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-quote {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.footer-beian {
    margin-top: 0.75rem;
    font-size: 0.8rem;
}

.footer-beian a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-beian a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .nav {
        justify-content: center;
    }
    
    .hero {
        padding: 2rem 1rem;
    }
    
    .hero-stats {
        gap: 2rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .notes-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 1.5rem;
    }
    
    .modal-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .main {
        padding: 1rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .nav-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
}