:root {
    --bg-main: #FDFCF8;
    --bg-surface: #FFFFFF;
    
    --text-primary: #1C1C1E;
    --text-secondary: #6B6B70;
    --text-muted: #99999F;
    
    --border-color: rgba(0, 0, 0, 0.06);
    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.03);
    
    --color-green-bg: #EAF2EE;
    --color-green-text: #2D6A4F;
    --color-yellow-bg: #FFF3E5;
    --color-yellow-text: #9C6628;
    --color-red-bg: #FBEAEA;
    --color-red-text: #9B2C2C;
    
    --color-pill-bg: #F2F2F4;
    --color-pill-text: #48484A;
    
    --color-accent-bg: #EEF0F4;
    --color-accent-text: #32435F;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
html { scroll-behavior: smooth; }
@keyframes slideDown { from { transform: translateY(-16px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes fadeScaleIn { from { transform: scale(1.02); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes slideUp { from { transform: translateY(30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes slideUpSlight { from { transform: translateY(16px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.desktop-only { display: none !important; }
@media (min-width: 768px) { .desktop-only { display: flex !important; } span.desktop-only { display: inline !important; } }

/* HERO SECTION */
.hero-wrapper {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background-color: var(--bg-main);
    overflow: hidden;
}
.hero-bg-grid {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 0;
    background-image: linear-gradient(var(--border-color) 1px, transparent 1px), linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 80px 80px;
    background-position: center;
    opacity: 0.5;
    animation: fadeScaleIn 1.5s ease forwards;
}
.hero-nav {
    position: fixed;
    top: 0; left: 0; width: 100%; z-index: 50; pointer-events: none;
    padding: 16px; display: flex; justify-content: space-between; align-items: center;
    opacity: 0; animation: slideDown 0.8s ease forwards;
    background: linear-gradient(to bottom, rgba(253,252,248,0.95) 0%, transparent 100%);
    backdrop-filter: blur(8px);
}
@media (min-width: 768px) { .hero-nav { padding: 24px 32px; } }
.hero-nav > * { pointer-events: auto; }
.nav-left, .nav-right { display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; color: var(--color-accent-text); background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: 10px; padding: 4px 12px 4px 4px; box-shadow: 0 2px 8px rgba(0,0,0,0.02); }
.brand-icon { display: flex; align-items: center; justify-content: center; font-family: 'Inter', sans-serif; font-weight: 900; font-size: 1.05rem; background: var(--color-accent-text); color: white; padding: 4px 8px; border-radius: 6px; }
.brand-text { font-size: 14px; font-weight: 700; margin-left: 8px; letter-spacing: 0.02em; }
.menu-container { position: relative; display: inline-block; }
.menu-btn { display: flex; align-items: center; gap: 8px; background: var(--bg-surface); padding: 6px 16px 6px 6px; border-radius: 999px; text-decoration: none; color: var(--text-primary); box-shadow: 0 4px 12px rgba(0,0,0,0.05); border: 1px solid var(--border-color); transition: all 0.2s; position: relative; z-index: 10; }
.menu-btn:hover { box-shadow: 0 6px 16px rgba(0,0,0,0.08); }
.menu-icon-circle { width: 26px; height: 26px; background: var(--color-pill-bg); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.menu-text { font-size: 13px; font-weight: 500; }

/* TOC Dropdown Menu */
.toc-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 12px;
    background: rgba(253, 252, 248, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    padding: 16px;
    min-width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 60;
}
.menu-container:hover .toc-dropdown,
.menu-container.active .toc-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.toc-dropdown::before {
    content: '';
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 12px;
}
.toc-header {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    padding-left: 12px;
}
.toc-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.2s;
}
.toc-link:hover {
    background: var(--color-pill-bg);
    transform: translateX(4px);
}
.toc-num {
    font-family: 'Noto Serif SC', serif;
    font-size: 1rem;
    font-weight: 900;
    color: var(--color-accent-text);
    opacity: 0.5;
}
.toc-text {
    font-size: 0.95rem;
    font-weight: 500;
}
.menu-text { font-size: 13px; font-weight: 500; }
.tags-pill, .dept-pill { background: var(--bg-surface); border-radius: 999px; padding: 10px 18px; font-size: 13px; font-weight: 500; display: flex; align-items: center; gap: 12px; border: 1px solid var(--border-color); box-shadow: 0 4px 12px rgba(0,0,0,0.03); color: var(--text-secondary); }
.dept-pill { padding: 6px 16px 6px 6px; }
.dept-icon-circle { width: 26px; height: 26px; background: var(--color-pill-bg); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.tag-divider { width: 1px; height: 12px; background: var(--border-color); }
.hero-spacer { flex-grow: 1; }
.hero-footer { position: relative; z-index: 30; background: linear-gradient(to top, var(--bg-main) 0%, rgba(253,252,248,0.8) 70%, transparent 100%); padding: 40px 16px 60px; opacity: 0; animation: slideUp 1s ease 0.3s forwards; }
@media (min-width: 768px) { .hero-footer { padding: 48px 32px 80px; } }
.hero-footer-layout { display: flex; flex-direction: column; gap: 32px; max-width: 1000px; margin: 0 auto; }
@media (min-width: 768px) { .hero-footer-layout { flex-direction: row; justify-content: space-between; align-items: flex-end; } }
.subtitle-line { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; }
.subtitle-line .dot { width: 8px; height: 8px; background: var(--color-accent-text); border-radius: 50%; }
.subtitle-text { font-size: 14px; color: var(--text-secondary); font-weight: 500; letter-spacing: 0.02em; }
.hero-heading { font-family: 'Noto Serif SC', serif; font-weight: 900; font-size: clamp(3rem, 8vw, 5rem); letter-spacing: -0.01em; line-height: 1.2; margin-bottom: 32px; color: var(--text-primary); text-wrap: balance; }
.hero-buttons { display: flex; gap: 16px; }
.btn-primary, .btn-secondary { padding: 14px 28px; border-radius: 999px; font-size: 14px; font-weight: 500; text-decoration: none; transition: all 0.2s; position: relative; z-index: 10; }
.btn-primary { background: var(--color-accent-text); color: white; box-shadow: 0 8px 20px rgba(50, 67, 95, 0.2); }
.btn-secondary { background: var(--bg-surface); color: var(--text-primary); border: 1px solid var(--border-color); box-shadow: 0 4px 12px rgba(0,0,0,0.03); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(50, 67, 95, 0.3); }
.btn-secondary:hover { transform: translateY(-2px); box-shadow: 0 8px 16px rgba(0,0,0,0.06); }
.hero-right-block { display: flex; gap: 10px; align-items: center; }
.hero-tag { background: var(--color-pill-bg); color: var(--color-pill-text); padding: 8px 16px; border-radius: 999px; font-size: 12px; font-weight: 500; }
.anim-sub { opacity: 0; animation: slideUpSlight 0.8s ease 0.5s forwards; }
.anim-heading { opacity: 0; animation: slideUpSlight 0.8s ease 0.7s forwards; }
.anim-btn { opacity: 0; animation: slideUpSlight 0.8s ease 0.9s forwards; }

/* MAIN CONTENT */
.main-content { background: var(--bg-main); position: relative; z-index: 40; max-width: 900px; margin: 0 auto; padding: 60px 24px 100px; }
.section { margin-bottom: 80px; scroll-margin-top: 140px; }
.section-header { margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--border-color); }
.section-title { font-family: 'Noto Serif SC', serif; font-size: 1.75rem; font-weight: 900; color: var(--color-accent-text); }
.section-desc { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 32px; line-height: 1.7; }

/* Picks Grid & Cards Hover Extension */
.picks-grid { display: grid; gap: 24px; }
.pick-card { 
    background: var(--bg-surface); border-radius: 16px; padding: 32px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); 
    position: relative; transition: transform 0.2s, box-shadow 0.2s; 
}
.pick-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.06); }
.pick-card:hover .pick-link { background: #E2E5EC; }
.pick-number { font-family: 'Noto Serif SC', serif; font-size: 1.5rem; font-weight: 900; color: var(--color-accent-bg); -webkit-text-stroke: 1px var(--color-accent-text); margin-bottom: 12px; }
.pick-title { font-size: 1.35rem; font-weight: 600; margin-bottom: 12px; }
.pick-desc { color: var(--text-secondary); font-size: 1rem; margin-bottom: 20px; }
.pick-link { display: inline-flex; align-items: center; font-size: 0.95rem; font-weight: 500; color: var(--color-accent-text); text-decoration: none; background: var(--color-accent-bg); padding: 8px 16px; border-radius: 8px; transition: background 0.2s; }
.pick-link::after { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; z-index: 10; border-radius: 16px; }
.pick-note { font-size: 0.95rem; color: var(--text-secondary); background: var(--color-pill-bg); padding: 8px 16px; border-radius: 8px; display: inline-block; position: relative; z-index: 11; }

.legend-box { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 32px; padding: 20px 24px; background: var(--bg-surface); border-radius: 12px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
.legend-item { font-size: 0.95rem; color: var(--text-secondary); display: flex; align-items: center; gap: 8px; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; }
.status-dot.green { background: var(--color-green-text); }
.status-dot.yellow { background: var(--color-yellow-text); }
.status-dot.red { background: var(--color-red-text); }

.scenario-block { margin-bottom: 64px; }
.scenario-title { font-size: 1.35rem; font-weight: 600; margin-bottom: 12px; }
.scenario-desc { font-size: 1rem; color: var(--text-secondary); margin-bottom: 24px; }
.tools-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 600px) { .tools-grid { grid-template-columns: 1fr 1fr; } }
.tool-card { 
    border: 1px solid var(--border-color); padding: 24px; background: var(--bg-surface); border-radius: 16px; box-shadow: var(--shadow-soft); 
    display: flex; flex-direction: column; transition: transform 0.2s, box-shadow 0.2s; position: relative;
}
.tool-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.06); }
.tool-card:hover .tool-name { color: var(--color-accent-text); }
.tool-card.highlight { border: 2px solid var(--color-accent-bg); background: #FFFFFF; }
.tool-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 16px; }
.tool-name { font-size: 1.15rem; font-weight: 600; text-decoration: none; color: var(--text-primary); transition: color 0.2s; }
.tool-name::after { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; z-index: 10; border-radius: 16px; }
.tool-price { font-size: 0.85rem; font-weight: 500; padding: 6px 12px; border-radius: 8px; white-space: nowrap; position: relative; z-index: 11; }
.tool-card.status-green .tool-price { background: var(--color-green-bg); color: var(--color-green-text); }
.tool-card.status-yellow .tool-price { background: var(--color-yellow-bg); color: var(--color-yellow-text); }
.tool-card.status-red .tool-price { background: var(--color-red-bg); color: var(--color-red-text); }
.tool-desc { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 16px; flex-grow: 1; }
.tool-meta-note { font-size: 0.85rem; color: var(--text-muted); background: var(--color-pill-bg); padding: 8px 12px; border-radius: 8px; position: relative; z-index: 11; }

/* Readings Box 修理排版截断问题 */
.readings-box { margin-top: 24px; background: var(--bg-surface); padding: 24px; border-radius: 16px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
.reading-item { margin-bottom: 16px; font-size: 0.95rem; display: block; line-height: 1.6; }
.reading-item:last-child { margin-bottom: 0; }
.reading-icon { font-size: 1rem; margin-right: 6px; display: inline-block; vertical-align: baseline; }
.reading-item a { color: var(--color-accent-text); font-weight: 600; text-decoration: none; transition: opacity 0.2s; position: relative; z-index: 10; display: inline; }
.reading-item a:hover { opacity: 0.7; text-decoration: underline; }
.reading-desc { color: var(--text-secondary); font-size: 0.9rem; display: inline; margin-left: 4px; }

/* Projects */
.projects-list { display: flex; flex-direction: column; gap: 24px; }
.project-item { background: var(--bg-surface); padding: 32px; border-radius: 16px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
.project-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.project-title { font-size: 1.25rem; font-weight: 600; }
.dept-badge { font-size: 0.85rem; background: var(--color-pill-bg); color: var(--color-pill-text); padding: 6px 12px; border-radius: 8px; font-weight: 500; }

/* Before / After UI Widget */
.project-ui-widget {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.02);
}

.project-ui-widget::after {
    content: '';
    position: absolute;
    top: 0; right: 0; bottom: 0;
    width: 50%;
    background: linear-gradient(90deg, transparent, rgba(45, 106, 79, 0.03) 80%);
    z-index: 0;
}

.ui-before, .ui-after {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    z-index: 2;
}

.ui-badge {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 16px;
}

.ui-badge.before {
    background: #F2F2F4;
    color: #6B6B70;
}

.ui-badge.after {
    background: var(--color-green-bg);
    color: var(--color-green-text);
}

.ui-data {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.ui-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
}

.ui-icon.before-icon {
    background: #FFFFFF;
    border: 1px solid #E5E5EA;
    color: #8E8E93;
}

.ui-icon.after-icon {
    background: #FFFFFF;
    border: 1px solid #D1E5DB;
    color: var(--color-green-text);
    box-shadow: 0 8px 24px rgba(45, 106, 79, 0.1);
}

.ui-value {
    font-family: 'Noto Serif SC', serif;
    font-size: 2.25rem;
    font-weight: 900;
    line-height: 1;
    color: var(--text-primary);
}

.ui-value .ui-unit {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-left: 4px;
    font-family: 'Inter', sans-serif;
}

.ui-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.ui-separator {
    position: relative;
    width: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.ui-line {
    position: absolute;
    top: 50%;
    left: -50%;
    right: -50%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #E5E5EA 20%, #E5E5EA 80%, transparent);
    z-index: -1;
}

.ui-vs {
    background: #FFFFFF;
    border: 1px solid #E5E5EA;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: bold;
    box-shadow: 0 4px 12px rgba(0,0,0,0.02);
}

.project-details {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-top: 8px;
    padding: 0 8px;
}

/* CTA Section */
.end-section { padding-top: 64px; text-align: center; }
.cta-box { background: var(--bg-surface); padding: 48px 32px; border-radius: 24px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
.cta-title { font-family: 'Noto Serif SC', serif; font-size: 1.75rem; font-weight: 900; margin-bottom: 16px; color: var(--color-accent-text); text-wrap: balance; }
.cta-desc { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 0; text-wrap: balance; }
.footer-bottom { margin-top: 64px; font-size: 0.9rem; color: var(--text-muted); user-select: none; -webkit-user-select: none; }

/* Mobile Responsiveness */
@media (max-width: 767px) {
    /* 大幅增加左右两侧的留白，给屏幕边缘充分的呼吸感 */
    .main-content { padding: 40px 32px 80px; }
    .section { margin-bottom: 60px; scroll-margin-top: 120px; }
    
    /* 统一缩放导航栏两侧所有元素，确保它们的高度和字号视觉上完美对齐 */
    .hero-nav { padding: 12px 16px; }
    .nav-left, .nav-right { gap: 6px; }
    
    /* 左上角 Logo 缩放 */
    .brand { padding: 3px 8px 3px 3px; border-radius: 8px; }
    .brand-icon { font-size: 12px; padding: 4px 6px; border-radius: 5px; }
    .brand-text { font-size: 12px; margin-left: 4px; }
    
    /* 目录按钮与右上角标签统一缩放 */
    .menu-btn, .dept-pill { padding: 4px 12px 4px 4px; gap: 6px; }
    .menu-icon-circle, .dept-icon-circle { width: 22px; height: 22px; }
    .menu-text { font-size: 12px; }
    .dept-pill { font-size: 12px; }
    /* svg 图标也稍微按比例缩小 */
    .menu-icon-circle svg, .dept-icon-circle svg { transform: scale(0.85); }
    
    /* Hero Section */
    .hero-heading { font-size: 2.5rem; margin-bottom: 24px; }
    .hero-buttons { flex-wrap: wrap; gap: 12px; }
    .hero-buttons a { flex: 1; text-align: center; min-width: 140px; }
    
    /* Cards Padding - 适当收紧卡片内部边距，避免文字区域过小 */
    .pick-card, .project-item, .cta-box { padding: 28px 20px; }
    
    /* Project UI Widget Vertical Stacking */
    .project-ui-widget {
        flex-direction: column;
        padding: 32px 20px;
    }
    .project-ui-widget::after {
        top: 50%; left: 0; right: 0; bottom: 0; width: 100%; height: 50%;
        background: linear-gradient(180deg, transparent, rgba(45, 106, 79, 0.04) 100%);
    }
    .ui-separator {
        transform: rotate(90deg);
        margin: 24px 0;
    }
    
    /* Tools Grid adjustments */
    .tool-header { flex-direction: column; align-items: flex-start; gap: 8px; }
    
    /* CTA Box */
    .cta-title { font-size: 1.5rem; }
    .cta-desc { font-size: 1rem; }
}

/* Utilities */
.fade-in-up { opacity: 0; transform: translateY(24px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in-up.visible { opacity: 1; transform: translateY(0); }