/* ===== CSS Variables ===== */
:root {
    --color-primary: #2D5A27;
    --color-secondary: #E07B39;
    --color-accent: #4A90A4;
    --color-background: #FFFFFF;
    --color-section-alt: #F8F9FA;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #E0E0E0;
    --color-success: #4CAF50;
    --color-white: #FFFFFF;

    --font-display: 'Oswald', sans-serif;
    --font-heading: 'Oswald', sans-serif;
    --font-body: 'Open Sans', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    --spacing-section: 6rem;

    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-card: 16px;
    --border-radius-btn: 24px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);

    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-bottom: var(--spacing-md); }
h3 { font-size: 1.25rem; }

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

a:hover {
    color: var(--color-primary);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--border-radius-btn);
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    box-shadow: 0 4px 12px rgba(45, 90, 39, 0.2);
}

.btn-primary:hover {
    background-color: #234a1f;
    color: var(--color-white);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(45, 90, 39, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--border-radius-btn);
    font-weight: 600;
}

.btn-secondary:hover {
    background-color: rgba(45, 90, 39, 0.1);
    color: var(--color-primary);
    font-weight: 600;
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.05rem;
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-white);
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-primary);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo:hover {
    color: var(--color-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text);
    font-weight: 600;
}

.nav-link:hover {
    color: var(--color-primary);
}

/* Nav link with button style should use button colors */
.nav-link.btn-primary {
    color: var(--color-white) !important;
}

.nav-link.btn-primary:hover {
    color: var(--color-white) !important;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section - Split Layout (Based on Reference Design) ===== */

/* Hero Banner - 横幅图片区域 */
.hero-banner {
    width: 100%;
    height: 35vh;
    min-height: 300px;
    /* TODO: 替换为实际背景图片 url('assets/images/hero-banner.jpg') */
    background: linear-gradient(135deg, #a8c4b8 0%, #7da88a 50%, #5c8a68 100%);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

/* Hero Content Section - 内容区域 */
.hero-content-section {
    background-color: #FFFFFF;
    padding: 80px 0;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

/* 标题样式 */
.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: #333333;
    margin-bottom: 1.5rem;
    font-family: var(--font-heading);
}

.year-highlight {
    color: #2E8B57;
    font-size: 64px;
    display: inline-block;
}

/* 副标题样式 */
.hero-subtitle {
    font-size: 18px;
    line-height: 1.5;
    color: #666666;
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* CTA 按钮区域 */
.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

/* 主按钮 - 绿色背景 */
.hero-content-section .btn-primary {
    background-color: #2E8B57;
    color: #FFFFFF;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 4px;
    transition: var(--transition);
}

.hero-content-section .btn-primary:hover {
    background-color: #257348;
    color: #FFFFFF;
}

/* 次按钮 - 浅绿色背景 */
.hero-content-section .btn-secondary {
    background-color: #F0F9F4;
    color: #2E8B57;
    border: 1px solid #2E8B57;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 500;
    border-radius: 4px;
    transition: var(--transition);
}

.hero-content-section .btn-secondary:hover {
    background-color: #e0f2e8;
    color: #2E8B57;
    border-color: #2E8B57;
}

/* 特性标签 */
.hero-trust {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.trust-item {
    font-size: 15px;
    color: #333333;
    font-weight: 400;
}

/* 响应式 - 平板 */
@media (max-width: 900px) {
    .hero-banner {
        height: 30vh;
        min-height: 250px;
    }

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

    .hero-content h1 {
        font-size: 40px;
    }

    .year-highlight {
        font-size: 52px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-cta {
        gap: 15px;
    }

    .hero-content-section .btn-primary,
    .hero-content-section .btn-secondary {
        padding: 12px 24px;
        font-size: 15px;
    }

    .hero-trust {
        gap: 20px;
    }

    .trust-item {
        font-size: 14px;
    }
}

/* 响应式 - 手机 */
@media (max-width: 480px) {
    .hero-banner {
        height: 25vh;
        min-height: 200px;
    }

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

    .hero-content h1 {
        font-size: 32px;
    }

    .year-highlight {
        font-size: 40px;
    }

    .hero-subtitle {
        font-size: 15px;
        margin-bottom: 2rem;
    }

    .hero-cta {
        flex-direction: column;
        gap: 12px;
    }

    .hero-content-section .btn-primary,
    .hero-content-section .btn-secondary {
        width: 100%;
        padding: 12px 20px;
        font-size: 15px;
    }

    .hero-trust {
        flex-direction: column;
        gap: 10px;
    }
}

/* ===== Section Intro ===== */
.section-intro {
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
    color: var(--color-text-light);
}

/* ===== Why Use Section ===== */
.why-use {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-white);
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-lg);
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.feature-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ===== Progress Bar ===== */
.progress-container {
    position: sticky;
    top: 60px;
    z-index: 900;
    background-color: var(--color-white);
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow);
    display: none;
}

.progress-container.visible {
    display: block;
}

.progress-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background-color: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background-color: var(--color-success);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.9rem;
    color: var(--color-text-light);
    white-space: nowrap;
}

/* ===== Checklist Section ===== */
.checklist-section {
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

/* Filter Buttons */
.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.filter-btn {
    padding: 0.5rem 1rem;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* Category */
.checklist-category {
    text-align: left;
    margin-bottom: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.checklist-category.hidden {
    display: none;
}

.category-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-white);
    cursor: pointer;
    transition: var(--transition);
}

.category-header:hover {
    background-color: #234a1f;
}

.category-header h3 {
    flex: 1;
    margin: 0;
    color: var(--color-white);
    font-size: 1.1rem;
}

.category-count {
    margin-right: var(--spacing-sm);
    font-size: 0.9rem;
    opacity: 0.9;
}

.toggle-icon {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.category-header.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.category-items {
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xs);
}

.category-items.collapsed {
    display: none;
}

/* Checklist Item */
.checklist-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.checklist-item:hover {
    background-color: var(--color-background);
}

.checklist-item input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    margin-right: var(--spacing-sm);
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: 4px;
    transition: var(--transition);
    flex-shrink: 0;
}

.checklist-item:hover .checkmark {
    border-color: var(--color-primary);
}

.checklist-item input:checked ~ .checkmark {
    background-color: var(--color-success);
    border-color: var(--color-success);
}

.checklist-item input:checked ~ .checkmark::after {
    content: "✓";
    color: var(--color-white);
    font-size: 14px;
    font-weight: bold;
}

.item-text {
    flex: 1;
    font-size: 0.95rem;
    transition: var(--transition);
}

.checklist-item input:checked ~ .item-text {
    text-decoration: line-through;
    color: var(--color-text-light);
}

/* ===== Seasonal Section ===== */
.seasonal-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-white);
    text-align: center;
}

.seasonal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.seasonal-card {
    padding: var(--spacing-lg);
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    text-align: left;
    transition: var(--transition);
}

.seasonal-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.seasonal-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.3rem;
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-text);
}

.seasonal-card ul {
    list-style: none;
    padding-left: 0;
}

.seasonal-card li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-light);
    font-size: 0.95rem;
    padding-left: 1.5rem;
    position: relative;
}

.seasonal-card li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

/* ===== Pre-Trip Section ===== */
.pretrip-section {
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.pretrip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-sm);
    max-width: 900px;
    margin: 0 auto;
    text-align: left;
}

.pretrip-item {
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
    padding: var(--spacing-sm);
}

.pretrip-item:hover {
    border-color: var(--color-primary);
    background-color: rgba(45, 90, 39, 0.05);
}

/* ===== Specialized Section ===== */
.specialized-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-white);
    text-align: center;
}

.specialized-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.specialized-card {
    padding: var(--spacing-lg);
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    text-align: left;
    transition: var(--transition);
}

.specialized-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.specialized-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.3rem;
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-text);
}

.specialized-card p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.5;
}

.specialized-card strong {
    display: block;
    margin-top: var(--spacing-sm);
    color: var(--color-text);
    font-weight: 600;
}

.specialized-card ul {
    list-style: none;
    padding-left: 0;
    margin-top: var(--spacing-xs);
}

.specialized-card li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-light);
    font-size: 0.9rem;
    padding-left: 1.5rem;
    position: relative;
}

.specialized-card li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

/* ===== Tips Section ===== */
.tips-section {
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.tip-card {
    padding: var(--spacing-lg);
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    text-align: left;
    transition: var(--transition);
}

.tip-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tip-card h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-text);
}

.tip-card ul {
    list-style: none;
}

.tip-card li {
    margin-bottom: var(--spacing-sm);
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.tip-card li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.tip-card li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: bold;
}

.tip-card li strong {
    color: var(--color-text);
}

/* ===== FAQ Section ===== */
.faq-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-white);
    text-align: center;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    text-align: left;
}

.faq-item {
    padding: var(--spacing-lg);
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
}

.faq-item h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
    font-size: 1.1rem;
}

.faq-item p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ===== Download Section ===== */
.download-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, #1e3d1a 100%);
    text-align: center;
    color: var(--color-white);
}

.download-section h2 {
    color: var(--color-white);
}

.download-section .section-intro {
    color: rgba(255, 255, 255, 0.9);
}

.download-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.pdf-preview {
    flex-shrink: 0;
}

.pdf-placeholder {
    width: 200px;
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.pdf-placeholder svg {
    width: 100%;
    max-width: 120px;
    margin-bottom: var(--spacing-sm);
}

.pdf-placeholder p {
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.9rem;
}

.download-info {
    text-align: left;
}

.download-features {
    margin-bottom: var(--spacing-md);
}

.download-features li {
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
}

.download-section .btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.download-section .btn-primary:hover {
    background-color: #c96a2f;
    color: var(--color-white);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.download-note {
    margin-top: var(--spacing-sm);
    font-size: 0.85rem;
    opacity: 0.8;
}

.share-buttons {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.share-buttons span {
    font-size: 0.9rem;
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: var(--color-white);
    font-weight: bold;
    transition: var(--transition);
}

.share-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    color: var(--color-white);
}

/* ===== Resources Section ===== */
.resources-section {
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.resource-card {
    display: block;
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    color: var(--color-text);
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    color: var(--color-text);
}

.resource-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.resource-card h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
    font-size: 1rem;
}

.resource-card p {
    color: var(--color-text-light);
    font-size: 0.85rem;
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-xl) 0 var(--spacing-md);
    background-color: var(--color-text);
    color: var(--color-white);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-sm);
}

.footer-brand .logo-text {
    color: var(--color-white);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    max-width: 300px;
}

.footer h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.footer ul li {
    margin-bottom: var(--spacing-xs);
}

.footer a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer a:hover {
    color: var(--color-white);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }

    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: var(--spacing-md);
        background-color: var(--color-white);
        box-shadow: var(--shadow);
    }

    .nav.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-trust {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .category-items {
        grid-template-columns: 1fr;
    }

    .download-content {
        flex-direction: column;
    }

    .download-info {
        text-align: center;
    }

    .share-buttons {
        justify-content: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand p {
        max-width: none;
    }

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

    .progress-wrapper {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .progress-text {
        order: -1;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        width: 100%;
    }

    .filter-buttons {
        gap: 4px;
    }

    .filter-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

/* ===== Print Styles ===== */
@media print {
    /* 隐藏页面上所有内容（除了 PDF 容器） */
    body > *:not(#pdf-content) {
        display: none !important;
    }

    /* 显示并正确定位 PDF 容器 */
    #pdf-content {
        position: static !important;
        left: auto !important;
        top: auto !important;
        width: 100% !important;
        max-width: 100% !important;
        display: block !important;
        margin: 0 !important;
        padding: 20px !important;
    }

    /* 重置背景为纯白 */
    body {
        background: white !important;
    }

    /* 移除默认的页眉页脚（浏览器支持情况不一） */
    @page {
        margin: 1cm;
    }

    /* 确保分类不会在页面中间断开 */
    #pdf-content > div[style*="margin-bottom"] {
        break-inside: avoid;
    }
}

/* ===== PDF Export Styles ===== */
.pdf-export-wrapper {
    position: relative;
    display: inline-block;
}

.pdf-export-options {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 0.5rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    min-width: 280px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
    z-index: 100;
}

.pdf-export-options.visible {
    opacity: 1;
    visibility: visible;
}

.export-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    padding: 1rem;
    border: none;
    background: none;
    cursor: pointer;
    text-align: left;
    transition: background 0.2s;
}

.export-option:first-child {
    border-radius: 8px 8px 0 0;
}

.export-option:last-child {
    border-radius: 0 0 8px 8px;
}

.export-option:hover {
    background: #f5f5f5;
}

.export-option .option-icon {
    font-size: 1.5rem;
}

.export-option .option-text {
    display: flex;
    flex-direction: column;
}

.export-option .option-text strong {
    display: block;
    color: var(--color-primary);
}

.export-option .option-text small {
    color: #666;
    font-size: 0.85rem;
}

/* PDF Loading Overlay */
.pdf-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 9999;
}

.pdf-loading-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.pdf-loading-content {
    text-align: center;
    color: #fff;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* PDF Content Styles */
.pdf-header {
    text-align: center;
    padding: 20px;
    border-bottom: 2px solid var(--color-primary);
    margin-bottom: 20px;
}

.pdf-header h1 {
    color: var(--color-primary);
    margin: 0 0 10px;
    font-size: 24px;
}

.pdf-date {
    color: #666;
    font-size: 0.9rem;
}

.pdf-footer {
    text-align: center;
    padding: 20px;
    margin-top: 20px;
    border-top: 1px solid #ddd;
    color: #666;
}

#pdf-wrapper .category-items.collapsed {
    display: block !important;
}

#pdf-wrapper .toggle-icon {
    display: none;
}

/* ===== Template + Add Mode Styles ===== */

/* Template Modal */
.template-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-md);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.template-modal.visible {
    opacity: 1;
    visibility: visible;
}

.template-modal-content {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    text-align: center;
}

.template-modal-content h2 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.template-modal-content > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.template-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.template-card {
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.template-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.template-card .template-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.template-card .template-name {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.template-card .template-description {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.template-card .template-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.template-card .template-difficulty {
    padding: 4px 8px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Mode Toggle Buttons */
.mode-toggle {
    display: flex;
    gap: 4px;
    background: var(--color-border);
    border-radius: 6px;
    padding: 4px;
}

.mode-btn {
    padding: 6px 16px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-text);
}

.mode-btn:hover {
    background: rgba(45, 90, 39, 0.1);
}

.mode-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Checklist Header */
.checklist-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Dual Column Layout */
.checklist-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    text-align: left;
}

/* Item Library (Left Column) */
.item-library {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
}

.library-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.library-header h3 {
    margin: 0;
    color: var(--color-primary);
    font-size: 1.1rem;
}

.search-input {
    padding: 0.5rem 0.75rem;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: var(--font-body);
    font-size: 0.9rem;
    width: 200px;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.library-items {
    max-height: 500px;
    overflow-y: auto;
}

.library-category {
    margin-bottom: var(--spacing-md);
}

.library-category-header {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-border);
}

.library-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.library-item:hover {
    background: var(--color-background);
}

.library-item-name {
    font-size: 0.95rem;
    color: var(--color-text);
}

.library-item.essential .library-item-name {
    font-weight: 600;
}

.add-btn {
    padding: 6px 12px;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
    white-space: nowrap;
}

.add-btn:hover {
    background: #234a1f;
}

.add-btn:disabled {
    background: var(--color-border);
    cursor: not-allowed;
    opacity: 0.6;
}

/* My Checklist (Right Column) */
.my-checklist {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    position: sticky;
    top: 140px;
    max-height: calc(100vh - 160px);
    display: flex;
    flex-direction: column;
}

.my-checklist-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.my-checklist-header h3 {
    margin: 0;
    color: var(--color-primary);
    font-size: 1.1rem;
}

.item-count {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-weight: 600;
}

.my-checklist-items {
    flex: 1;
    overflow-y: auto;
}

.checklist-item-new {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
    margin-bottom: 4px;
}

.checklist-item-new:hover {
    background: var(--color-background);
}

.checklist-item-new .item-info {
    flex: 1;
}

.checklist-item-new .item-name {
    font-size: 0.95rem;
    color: var(--color-text);
}

.checklist-item-new .item-category {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

/* Pack Mode Styles */
.my-checklist.pack-mode .checklist-item-new {
    cursor: pointer;
    user-select: none;
}

.my-checklist.pack-mode .checklist-item-new.packed {
    opacity: 0.5;
}

.my-checklist.pack-mode .checklist-item-new.packed .item-name {
    text-decoration: line-through;
}

.pack-checkbox {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-sm);
    cursor: pointer;
}

.remove-btn {
    padding: 4px 10px;
    background: transparent;
    color: #d32f2f;
    border: 1px solid #d32f2f;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    transition: var(--transition);
    white-space: nowrap;
}

.remove-btn:hover {
    background: #d32f2f;
    color: var(--color-white);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--color-text-light);
}

.empty-state p {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Action Bar */
.action-bar {
    position: sticky;
    bottom: 0;
    background: var(--color-white);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
    padding: var(--spacing-md) 0;
    margin-top: var(--spacing-lg);
    z-index: 800;
}

.action-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.pack-progress {
    flex: 1;
    min-width: 200px;
}

.pack-progress-bar {
    height: 12px;
    background: var(--color-border);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 4px;
}

.pack-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    border-radius: 6px;
    transition: width 0.3s ease;
}

.pack-progress-text {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* Mobile My List Toggle */
.mobile-my-list-toggle {
    position: fixed;
    bottom: 80px;
    right: var(--spacing-md);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 900;
    transition: var(--transition);
}

.mobile-my-list-toggle:hover {
    background: #234a1f;
    transform: scale(1.1);
}

.mobile-my-list-toggle .toggle-icon {
    font-size: 1.5rem;
}

.mobile-my-list-toggle .toggle-count {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--color-secondary);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 700;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Mobile Responsive Adjustments */
@media (max-width: 768px) {
    .checklist-layout {
        grid-template-columns: 1fr;
    }

    .my-checklist {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        max-height: 60vh;
        border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
        transform: translateY(100%);
        transition: transform 0.3s ease;
        z-index: 950;
    }

    .my-checklist.visible {
        transform: translateY(0);
    }

    .mobile-my-list-toggle {
        display: flex;
    }

    .action-bar {
        bottom: 60px;
    }

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

    .search-input {
        width: 100%;
    }

    .library-header {
        flex-direction: column;
        align-items: stretch;
    }

    .action-bar-content {
        flex-direction: column;
        align-items: stretch;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }
}

/* ===== Western UI/UX Redesign Styles ===== */

/* Section Header Centered Pattern */
.section-header-centered {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header-centered h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.section-header-centered p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Hero Section (Split Layout) ===== */
.hero-section {
    padding: 5rem 0;
    background: var(--color-white);
}

.hero-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content-left {
    text-align: left;
}

.hero-headline {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.hero-highlight {
    color: var(--color-primary);
    display: inline-block;
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image-placeholder {
    width: 100%;
    max-width: 500px;
    aspect-ratio: 4/3;
}

.hero-image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius-card);
    box-shadow: var(--shadow-lg);
}

/* ===== Benefits Section (Redesigned) ===== */
.benefits-section {
    padding: var(--spacing-section) 0;
    background: var(--color-white);
    text-align: center;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.benefit-item {
    padding: 2rem;
    text-align: center;
}

.benefit-icon {
    margin-bottom: 1.5rem;
    color: var(--color-primary);
}

.benefit-icon svg {
    width: 48px;
    height: 48px;
}

.benefit-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.benefit-item p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-light);
}

/* ===== FAQ Accordion (Redesigned) ===== */
.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item-accordion {
    border-bottom: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    padding: 1.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    text-align: left;
    font-family: var(--font-heading);
    transition: color 0.3s ease;
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-question span:first-child {
    flex: 1;
    padding-right: 1rem;
}

.faq-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
    color: var(--color-primary);
    flex-shrink: 0;
}

.faq-item-accordion.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item-accordion.active .faq-answer {
    max-height: 300px;
    padding-bottom: 1.5rem;
}

.faq-answer p {
    color: var(--color-text-light);
    line-height: 1.6;
    margin: 0;
}

/* ===== Enhanced Responsive Styles ===== */

@media (max-width: 900px) {
    .hero-headline {
        font-size: 2.5rem;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .hero-split {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-headline {
        font-size: 2rem;
    }

    .hero-section {
        padding: 3rem 0;
    }

    .section-header-centered h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-headline {
        font-size: 1.75rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .testimonial-card {
        padding: 1.5rem;
    }
}