:root {
    /* 核心品牌调色板 (Clary Sage 鼠尾草绿 + 温暖自然色调) */
    --color-primary: #637765;         /* Clary Sage 标志性鼠尾草绿 */
    --color-primary-dark: #4F6151;    /* 浓郁鼠尾草绿 */
    --color-primary-light: #8E9F90;   /* 柔和鼠尾草绿 */
    --color-primary-soft: #EEF2EE;    /* 极浅鼠尾草背景微晕 */

    --color-bg: #FAF8F5;              /* Warm Ivory / 米白基底色 */
    --color-surface: #FFFFFF;         /* 纯白卡片背景 */
    --color-surface-warm: #F4EFEA;    /* 温暖麦芽米色 */
    
    --color-text-main: #272826;       /* Warm Charcoal 炭黑主体字 */
    --color-text-muted: #6C706B;      /* 中性柔和灰绿灰 */
    --color-text-light: #9B9E99;      /* 辅助浅灰 */

    --color-border: #E8E4DD;          /* 温暖温润边框 */
    --color-accent-brown: #947E6F;    /* Soft Brown 沉稳棕金 */

    --font-serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", STSong, Georgia, serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;

    --shadow-soft: 0 10px 30px -10px rgba(99, 119, 101, 0.08);
    --shadow-hover: 0 20px 40px -12px rgba(44, 45, 43, 0.12);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    --transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

/* 基础重置 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

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

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 标题与文字样式 */
h1, h2, h3, h4, .serif-font {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.35;
    letter-spacing: 0.02em;
    color: var(--color-text-main);
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 12px;
}

.section-title {
    font-size: 38px;
    margin-bottom: 20px;
    position: relative;
}

.section-desc {
    font-size: 16px;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.8;
}

/* 按钮规范 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 32px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.03em;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}
.btn-primary:hover {
    background-color: var(--color-primary-dark);
    box-shadow: 0 8px 20px rgba(99, 119, 101, 0.28);
    transform: translateY(-2px);
}

.btn-outline {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background-color: transparent;
}
.btn-outline:hover {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-soft {
    background-color: var(--color-surface-warm);
    color: var(--color-text-main);
}
.btn-soft:hover {
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
}

/* 导航栏 Header (Full Width & Clean Alignment) */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
    background: rgba(250, 248, 245, 0.96);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(232, 228, 221, 0.7);
    transition: var(--transition);
}

.header-full-width {
    width: 100%;
    max-width: 100%;
    padding: 0 36px;
    box-sizing: border-box;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 84px;
    gap: 20px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.brand-logo .logo-mark {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 19px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(99, 119, 101, 0.2);
}
.brand-logo .logo-text {
    font-family: var(--font-serif);
    font-size: 21px;
    letter-spacing: 0.08em;
    font-weight: 600;
    color: var(--color-text-main);
    white-space: nowrap;
}
.brand-logo .logo-sub {
    font-size: 11px;
    color: var(--color-text-muted);
    letter-spacing: 0.12em;
    display: block;
    font-family: var(--font-sans);
    margin-top: -2px;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1 1 auto;
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-main);
    position: relative;
    padding: 8px 4px;
    white-space: nowrap;
    letter-spacing: 0.02em;
    display: inline-block;
}
.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
}
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 4px;
    right: 4px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
}

.cart-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 9px 18px;
    background: var(--color-surface-warm);
    border-radius: var(--radius-full);
    font-size: 13.5px;
    font-weight: 500;
    white-space: nowrap;
    border: 1px solid var(--color-border);
}
.cart-pill:hover {
    background: var(--color-primary-soft);
    border-color: var(--color-primary-light);
}
.cart-pill .badge {
    background: var(--color-primary);
    color: #fff;
    border-radius: 10px;
    padding: 1px 7px;
    font-size: 11px;
    font-weight: 600;
}

/* 移动端菜单按钮 */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 24px;
    color: var(--color-text-main);
}

/* 首页 Hero 区域 */
.hero-section {
    position: relative;
    padding: 90px 0 110px;
    background: radial-gradient(circle at top right, rgba(142, 159, 144, 0.12), transparent 50%),
                radial-gradient(circle at bottom left, rgba(244, 239, 234, 0.8), transparent 50%);
    text-align: center;
}

.hero-tag {
    display: inline-block;
    padding: 6px 20px;
    background: var(--color-primary-soft);
    color: var(--color-primary-dark);
    border-radius: var(--radius-full);
    font-size: 13px;
    letter-spacing: 0.12em;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 54px;
    margin-bottom: 20px;
    letter-spacing: 0.04em;
    color: var(--color-text-main);
}

.hero-subtitle {
    font-size: 24px;
    color: var(--color-primary-dark);
    font-family: var(--font-serif);
    margin-bottom: 24px;
    font-weight: 400;
}

.hero-desc {
    max-width: 680px;
    margin: 0 auto 36px;
    font-size: 16.5px;
    color: var(--color-text-muted);
    line-height: 1.9;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* 品牌故事 Section */
.story-section {
    padding: 90px 0;
    background: #ffffff;
}
.story-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.story-box {
    background: var(--color-surface-warm);
    border-radius: var(--radius-lg);
    padding: 50px;
    border: 1px solid var(--color-border);
}
.story-box blockquote {
    font-family: var(--font-serif);
    font-size: 26px;
    color: var(--color-primary-dark);
    margin-bottom: 24px;
    line-height: 1.5;
}
.story-box p {
    color: var(--color-text-muted);
    margin-bottom: 18px;
    font-size: 15.5px;
}

/* 探索卡片 5大方向 */
.explore-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 50px;
}
.explore-card {
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.explore-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-primary-light);
}
.explore-card .card-num {
    font-family: var(--font-serif);
    font-size: 16px;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 12px;
}
.explore-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}
.explore-card p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
    flex-grow: 1;
}
.explore-card .card-link {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 课程、产品、服务卡片通用 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.item-card {
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.item-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}
.card-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: rgba(255, 255, 255, 0.9);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary-dark);
}
.card-body {
    padding: 28px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}
.card-body h3 {
    font-size: 21px;
    margin-bottom: 10px;
}
.card-body .card-meta {
    font-size: 13.5px;
    color: var(--color-text-light);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.card-body .card-desc {
    font-size: 14.5px;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    line-height: 1.7;
    flex-grow: 1;
}
.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}
.card-price {
    font-size: 22px;
    font-family: var(--font-serif);
    font-weight: 600;
    color: var(--color-primary-dark);
}

/* 提示信息 Flash Alert */
.flash-container {
    padding-top: 20px;
}
.alert {
    padding: 14px 24px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    font-size: 14.5px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.alert-success {
    background-color: #E8F3EB;
    color: #2F643B;
    border: 1px solid #C4E2CB;
}
.alert-error {
    background-color: #FDEDED;
    color: #932D2D;
    border: 1px solid #F5C6C6;
}

/* 页脚 Footer */
.site-footer {
    background: #1F2220;
    color: #E5E7E4;
    padding: 80px 0 30px;
    margin-top: 100px;
}
.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 60px;
}
.footer-brand h4 {
    font-size: 24px;
    color: #ffffff;
    margin-bottom: 16px;
}
.footer-brand p {
    font-size: 14px;
    color: #A3A8A2;
    line-height: 1.8;
    max-width: 320px;
}
.footer-col h5 {
    font-size: 16px;
    color: #ffffff;
    margin-bottom: 20px;
    font-family: var(--font-sans);
    font-weight: 600;
}
.footer-col ul {
    list-style: none;
}
.footer-col li {
    margin-bottom: 12px;
}
.footer-col a {
    font-size: 14px;
    color: #A3A8A2;
}
.footer-col a:hover {
    color: #ffffff;
}
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    color: #797E78;
}

/* 响应式适配 */
@media (max-width: 1300px) {
    .header-full-width {
        padding: 0 20px;
    }
    .nav-links {
        gap: 14px;
    }
    .nav-link {
        font-size: 13.5px;
    }
}

@media (max-width: 1100px) {
    .nav-links {
        gap: 10px;
    }
    .nav-link {
        font-size: 13px;
    }
}

@media (max-width: 992px) {
    .nav-links {
        display: none;
    }
    .mobile-toggle {
        display: block;
    }
    .hero-title {
        font-size: 40px;
    }
    .story-grid {
        grid-template-columns: 1fr;
    }
    .footer-top {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 32px;
    }
    .hero-subtitle {
        font-size: 20px;
    }
    .footer-top {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}