:root {
    --jade: #7a2f8e;
    /* 主紫，呼应 Logo 主色 */
    --leaf: #1aa4a2;
    /* 辅助青绿，呼应 Logo 水纹 */
    --sand: #f7f5f2;
    /* 背景米白 */
    --amber: #1aa4a2;
    /* CTA 按钮改用青绿更统一 */
    --ink: #1f1a2e;
    /* 深色文字/底色，偏紫黑 */
}

body {
    font-family: 'Manrope', 'Noto Serif SC', system-ui, -apple-system, "Segoe UI", sans-serif;
    background: var(--sand);
    color: var(--ink);
    letter-spacing: 0.01em;
}

h1,
h2,
h3,
h4,
h5 {
    font-family: 'Noto Serif SC', 'Manrope', serif;
    color: var(--jade);
}

a.text-sand{color: var(--sand); text-decoration: none;}

.top-tip {
    position: fixed;
    inset: 0 0 auto 0;
    padding: 8px 0;
    background: linear-gradient(90deg, rgba(122, 47, 142, 0.08), rgba(26, 164, 162, 0.08));
    color: var(--sand);
    z-index: 1045;
    backdrop-filter: blur(6px);
    border-bottom: 1px solid rgba(31, 26, 46, 0.05);
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.navbar {
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(31, 26, 46, 0.06);
    transition: top 0.25s ease;
    padding: 0.9rem 1rem;
}

.navbar.top-nav {
    top: 42px;
}

.tip-hidden .top-tip {
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
}

.tip-hidden .navbar.top-nav {
    top: 0;
}


.navbar-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--ink);
    text-decoration: none;
}

.brand-logo {
    height: 52px;
    width: auto;
    display: block;
}

.brand-text {
    font-size: 2rem;
    color: var(--ink);
    white-space: nowrap;
}

.hero {
    position: relative;
    overflow: hidden;
    background: radial-gradient(circle at 20% 20%, rgba(26, 164, 162, 0.25), transparent 40%),
        radial-gradient(circle at 80% 10%, rgba(122, 47, 142, 0.28), transparent 45%),
        linear-gradient(160deg, #7a2f8e 0%, #1f1a2e 70%);
    color: #fdfaf3;
    padding: 140px 0 160px;
}

.hero-row {
    min-height: calc(100vh - 220px);
}

@media (max-width: 991.98px) {
    .hero-row {
        min-height: auto;
    }
}

.hero-compact {
    padding: 90px 0 80px;
}

.hero-compact .hero-row {
    min-height: 60vh;
}

@media (max-width: 991.98px) {
    .hero-compact .hero-row {
        min-height: auto;
    }
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url('../images/bg.jpg') center/cover;
    mix-blend-mode: overlay;
    opacity: 0.15;
}

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

.section-card {
    background: #fff;
    border: none;
    border-radius: 18px;
    box-shadow: 0 18px 50px rgba(20, 35, 28, 0.12);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.section-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 26px 60px rgba(20, 35, 28, 0.16);
}

.section-pill {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(26, 164, 162, 0.16);
    color: var(--jade);
    font-weight: 600;
    font-size: 0.9rem;
}

.accent-border {
    border-left: 6px solid var(--leaf);
    padding-left: 14px;
}

.btn-amber {
    background: var(--amber);
    border: none;
    color: #fff;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(26, 164, 162, 0.35);
}

.btn-amber:hover {
    background: #148483;
}


.article-card {
    border: 1px solid rgba(122, 47, 142, 0.08);
    background: linear-gradient(180deg, #fff 0%, #f7f5f2 100%);
    border-radius: 14px;
    height: 100%;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}


.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 40px rgba(31, 26, 46, 0.14);
}

.badge-soft {
    background: rgba(122, 47, 142, 0.12);
    color: var(--jade);
}

.footer {
    background: #1f1a2e;
    color: #e9e5ef;
    padding: 50px 0;
}

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

.nav-link:hover,
.nav-link:focus {
    color: var(--jade);
}

.scrollspy-example {
    position: relative;
}

.subtle-divider {
    border-top: 1px dashed rgba(31, 26, 46, 0.18);
    margin: 1.5rem 0;
}

.nav-tree {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0.4rem;
}

.nav-tree>li {
    margin-bottom: 0.5rem;
}

.nav-tree li {
    position: relative;
    padding-left: 1.3rem;
}

.nav-tree li::before {
    content: '•';
    position: absolute;
    left: 0;
    top: 0.05rem;
    color: var(--jade);
    font-weight: 700;
}

.nav-tree .level-1 {
    font-weight: 700;
    color: var(--jade);
}

.nav-tree .level-2 {
    color: var(--ink);
}

.nav-tree a {
    color: inherit;
    text-decoration: none;
}

.nav-tree a:hover {
    color: var(--leaf);
    text-decoration: underline;
}