:root {
    --ink: #26211B;
    --ink-soft: #5A5348;
    --paper: #F6F1E6;
    --paper-2: #FBF7EE;
    --cinnabar: #9C2B25;
    --cinnabar-deep: #7E221D;
    --bamboo: #5F7A68;
    --line: rgba(38,33,27,.12);
    --serif: "Noto Serif SC","Songti SC",STSong,serif;
    --sans: "Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}

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

html {
    scroll-behavior: smooth
}

body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: inherit;
    text-decoration: none
}

.wrap {
    width: min(1120px,92%);
    margin: 0 auto
}

section {
    scroll-margin-top: 84px;
    padding: 80px 0;
}

/* 导航 */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(246,241,230,.94);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
}

.nav-inner {
    width: min(1120px,92%);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px
}

.brand-mark {
    width: 44px;
    height: 44px;
    flex: none;
    background: var(--cinnabar);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--paper);
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 700;
}

.brand-name {
    font-family: var(--serif);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 2px
}

.brand-sub {
    font-size: 11px;
    color: var(--ink-soft);
    letter-spacing: 2px;
    margin-top: 2px
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px
}

    .nav-links a {
        padding: 9px 14px;
        border-radius: 30px;
        font-size: 14px;
        color: var(--ink-soft);
        transition: all .25s;
    }

        .nav-links a:hover {
            color: var(--cinnabar);
            background: rgba(156,43,37,.06)
        }

.nav-cta {
    padding: 9px 20px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 500;
    color: var(--paper);
    background: var(--cinnabar);
    transition: background .25s;
}

    .nav-cta:hover {
        background: var(--cinnabar-deep)
    }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px
}

    .nav-toggle span {
        display: block;
        width: 22px;
        height: 2px;
        background: var(--ink);
        margin: 5px 0;
        border-radius: 2px
    }

/* Hero */
.hero {
    position: relative;
    padding: 100px 0 86px;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(180deg,var(--paper-2),var(--paper));
}

    .hero::before {
        content: "";
        position: absolute;
        left: 50%;
        top: -140px;
        transform: translateX(-50%);
        width: 800px;
        height: 800px;
        border-radius: 50%;
        background: radial-gradient(circle,rgba(156,43,37,.08),transparent 65%);
        pointer-events: none;
    }

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    letter-spacing: 4px;
    color: var(--cinnabar);
    margin-bottom: 24px;
}

    .hero-eyebrow::before, .hero-eyebrow::after {
        content: "";
        width: 26px;
        height: 1px;
        background: var(--cinnabar);
        opacity: .5
    }

.hero-title {
    font-family: var(--serif);
    font-weight: 700;
    font-size: clamp(28px,5vw,44px);
    letter-spacing: 6px;
    margin-bottom: 20px;
}

.hero-slogan {
    font-family: var(--serif);
    font-size: clamp(18px,3vw,24px);
    color: var(--ink-soft);
    margin-bottom: 24px;
}

.hero-desc {
    max-width: 700px;
    margin: 0 auto;
    color: var(--ink-soft);
    font-size: 16px;
}

.hero-btns {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 34px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 14.5px;
    font-weight: 500;
    transition: all .25s;
}

.btn-primary {
    background: var(--cinnabar);
    color: #fff;
}

    .btn-primary:hover {
        background: var(--cinnabar-deep)
    }

.btn-outline {
    border: 1px solid var(--cinnabar);
    color: var(--cinnabar)
}

    .btn-outline:hover {
        background: rgba(156,43,37,.06)
    }

/* 章节标题 */
.sec-head {
    text-align: center;
    margin-bottom: 48px
}

.sec-kicker {
    font-size: 12px;
    letter-spacing: 5px;
    color: var(--cinnabar);
    margin-bottom: 12px;
}

.sec-title {
    font-family: var(--serif);
    font-size: clamp(26px,4.5vw,36px);
    font-weight: 700;
    letter-spacing: 3px
}

.sec-line {
    width: 52px;
    height: 2px;
    background: var(--cinnabar);
    margin: 18px auto 0;
    border-radius: 2px
}

/* 机构简介 */
.about {
    background: var(--paper-2)
}

.about-content {
    max-width: 860px;
    margin: 0 auto;
    font-size: 16px;
    color: var(--ink-soft);
}

    .about-content p {
        margin-bottom: 16px;
    }

    .about-content b {
        color: var(--ink);
        font-weight: 500;
    }

/* 公益项目规划 */
.project-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 22px;
}

.project-card {
    background: var(--paper-2);
    border: 1px solid var(--line);
    border-radius: 18px;
    overflow: hidden;
    transition: transform .3s,box-shadow .3s;
}

    .project-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 16px 40px rgba(38,33,27,.08)
    }

.project-img {
    height: 180px;
    background: rgba(95,122,104,.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bamboo);
    font-family: var(--serif);
    font-size: 24px;
}

.project-body {
    padding: 26px;
}

    .project-body h3 {
        font-family: var(--serif);
        font-size: 20px;
        margin-bottom: 10px;
        letter-spacing: 1px;
    }

    .project-body p {
        color: var(--ink-soft);
        font-size: 14.5px;
    }

/* 帮扶申请表 */
.apply {
    background: var(--paper-2)
}

.apply-box {
    max-width: 760px;
    margin: 0 auto;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 36px;
}

.form-row {
    margin-bottom: 20px;
}

    .form-row label {
        display: block;
        margin-bottom: 7px;
        font-size: 14px;
        color: var(--ink);
    }

    .form-row input, .form-row select, .form-row textarea {
        width: 100%;
        padding: 12px 14px;
        border: 1px solid var(--line);
        border-radius: 10px;
        background: #fff;
        font-family: var(--sans);
        font-size: 15px;
        outline: none;
        transition: border .2s;
    }

        .form-row input:focus, .form-row select:focus, .form-row textarea:focus {
            border-color: var(--cinnabar);
        }

    .form-row textarea {
        min-height: 120px;
        resize: vertical;
    }

.form-tip {
    font-size: 13px;
    color: #944;
    line-height: 1.7;
    margin-bottom: 24px;
}

.submit-wrap {
    text-align: center;
    margin-top: 10px;
}

/* 筹备动态 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(2,1fr);
    gap: 22px;
}

.news-item {
    background: var(--paper-2);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 24px;
    transition: transform .25s;
}

    .news-item:hover {
        transform: translateY(-4px)
    }

.news-date {
    font-size: 12px;
    color: var(--cinnabar);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.news-item h3 {
    font-family: var(--serif);
    font-size: 18px;
    margin-bottom: 10px;
}

.news-item p {
    color: var(--ink-soft);
    font-size: 14px;
}

/* 联系我们 */
.contact {
    background: var(--paper-2)
}

.contact-wrap {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.contact-info {
    font-size: 16px;
    color: var(--ink-soft);
    line-height: 2.2;
}

    .contact-info b {
        color: var(--ink)
    }

/* 底部 */
.footer {
    border-top: 1px solid var(--line);
    padding: 44px 0 32px;
    text-align: center;
    background: var(--paper)
}

.footer-brand {
    font-family: var(--serif);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 8px
}

.footer-slogan {
    color: var(--ink-soft);
    font-size: 14px;
    letter-spacing: 2px;
    margin-bottom: 20px
}

.footer-copy {
    color: var(--ink-soft);
    font-size: 12.5px;
    opacity: .8
}

/* 响应式 */
@media (max-width:860px) {
    .nav-toggle {
        display: block
    }

    .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--paper);
        border-bottom: 1px solid var(--line);
        padding: 10px 20px 18px;
        display: none;
    }

        .nav-links.open {
            display: flex
        }

        .nav-links a {
            padding: 12px 8px;
            border-radius: 10px
        }

    .project-grid, .news-grid {
        grid-template-columns: 1fr;
        max-width: 460px;
        margin: 0 auto
    }

    .apply-box {
        padding: 24px;
    }

    section {
        padding: 64px 0;
    }

    .hero {
        padding: 76px 0 60px;
    }
}