: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;
    --primary: #2563eb;
    --muted: #6b7280;
    --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
}

/* ===== 顶部导航 ===== */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(246,241,230,.92);
    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: 26px;
    font-weight: 700;
}

.brand-name {
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 2px
}

.brand-sub {
    font-size: 11px;
    color: var(--ink-soft);
    letter-spacing: 3px;
    margin-top: 2px
}
.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

    .brand small {
        font-family: var(--sans);
        font-size: .7rem;
        color: var(--muted);
        font-weight: 400;
        margin-left: 6px;
        letter-spacing: 0;
    }

.nav-links {
    display: flex;
    align-items: center;
    gap: 6px
}

    .nav-links a {
        padding: 9px 16px;
        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: 96px 0 80px;
    text-align: center;
    overflow: hidden;
}

    .hero::before {
        content: "";
        position: absolute;
        left: 50%;
        top: -120px;
        transform: translateX(-50%);
        width: 760px;
        height: 760px;
        border-radius: 50%;
        background: radial-gradient(circle,rgba(95,122,104,.10),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: 28px;
}

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

.char-row {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 6px;
    margin-bottom: 30px;
}

.char {
    font-family: var(--serif);
    font-weight: 900;
    font-size: clamp(88px,16vw,150px);
    line-height: 1;
    color: var(--ink);
    position: relative;
    padding: 0 4px;
}

    .char.c {
        color: var(--cinnabar)
    }

    .char.s {
        color: var(--bamboo)
    }

.char-plus {
    font-size: clamp(30px,5vw,44px);
    color: var(--ink-soft);
    font-family: var(--serif);
    margin-top: 30px;
    opacity: .55
}

.hero-title {
    font-family: var(--serif);
    font-weight: 700;
    font-size: clamp(22px,4vw,34px);
    letter-spacing: 6px;
    margin-bottom: 18px;
}

    .hero-title em {
        font-style: normal;
        color: var(--cinnabar)
    }

.hero-sub {
    max-width: 640px;
    margin: 0 auto;
    color: var(--ink-soft);
    font-size: 16px;
}

.hero-tags {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 34px;
}

    .hero-tags span {
        font-size: 13px;
        letter-spacing: 2px;
        color: var(--ink);
        border: 1px solid var(--line);
        border-radius: 30px;
        padding: 7px 18px;
        background: var(--paper-2);
    }

.hero-scroll {
    margin-top: 52px;
    color: var(--ink-soft);
    font-size: 12px;
    letter-spacing: 3px;
    opacity: .7
}

/* ===== 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,38px);
    font-weight: 700;
    letter-spacing: 3px
}

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

/* ===== 品牌理念 · 拆字会意 ===== */
.philosophy {
    padding: 84px 0
}

.philosophy-lead {
    max-width: 760px;
    margin: 0 auto 56px;
    text-align: center;
    color: var(--ink-soft);
    font-size: 16.5px;
    line-height: 2.1;
}

    .philosophy-lead b {
        color: var(--ink);
        font-weight: 500
    }

.split-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 20px;
}

.split-card {
    background: var(--paper-2);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 36px 28px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: transform .3s,box-shadow .3s;
}

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

    .split-card::before {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
        height: 3px;
        background: var(--cinnabar);
    }

    .split-card.c2::before {
        background: var(--bamboo)
    }

    .split-card.c3::before {
        background: var(--cinnabar)
    }

.split-char {
    font-family: var(--serif);
    font-weight: 900;
    font-size: 64px;
    line-height: 1;
    margin-bottom: 8px;
}

.split-card.c1 .split-char {
    color: var(--cinnabar)
}

.split-card.c2 .split-char {
    color: var(--bamboo)
}

.split-card.c3 .split-char {
    color: var(--ink)
}

.split-word {
    font-family: var(--serif);
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.split-desc {
    color: var(--ink-soft);
    font-size: 14.5px;
    line-height: 1.9
}

.split-note {
    margin-top: 26px;
    font-size: 13px;
    color: var(--ink-soft);
    border-top: 1px dashed var(--line);
    padding-top: 16px;
    letter-spacing: 1px;
}

    .split-note b {
        color: var(--cinnabar);
        font-weight: 600
    }

.philosophy-close {
    max-width: 820px;
    margin: 52px auto 0;
    text-align: center;
    font-family: var(--serif);
    font-size: 18px;
    line-height: 2.2;
    color: var(--ink);
}

    .philosophy-close b {
        color: var(--cinnabar);
        font-weight: 700
    }

/* ===== 入口板块 ===== */
.entries {
    background: var(--paper-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 84px 0
}

.entry-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 20px
}

.entry-card {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 40px 30px;
    text-align: center;
    transition: transform .3s,box-shadow .3s,border-color .3s;
}

    .entry-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 18px 44px rgba(38,33,27,.09);
        border-color: rgba(156,43,37,.3)
    }

.entry-icon {
    width: 58px;
    height: 58px;
    margin: 0 auto 22px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(156,43,37,.08);
    color: var(--cinnabar);
}

.entry-card.c2 .entry-icon {
    background: rgba(95,122,104,.12);
    color: var(--bamboo)
}

.entry-card.c3 .entry-icon {
    background: rgba(38,33,27,.06);
    color: var(--ink)
}

.entry-card h3 {
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 10px
}

.entry-card p {
    color: var(--ink-soft);
    font-size: 14.5px;
    margin-bottom: 26px;
    min-height: 48px
}

.entry-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 30px;
    border-radius: 30px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--paper);
    background: var(--cinnabar);
    transition: background .25s,transform .25s;
    border: none;
    cursor: pointer;
}

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

    .entry-btn .arr {
        transition: transform .25s
    }

    .entry-btn:hover .arr {
        transform: translateX(3px)
    }

/* ===== APP下载 ===== */
.download {
    padding: 84px 0
}

.dl-grid {
    display: grid;
    grid-template-columns: repeat(2,1fr);
    gap: 20px;
    max-width: 680px;
    margin: 0 auto
}

.dl-card {
    background: var(--paper-2);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 30px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.dl-qr {
    width: 112px;
    height: 112px;
    flex: none;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border: 1px solid var(--line);
}

    .dl-qr svg {
        width: 100px;
        height: 100px
    }

.dl-info h4 {
    font-family: var(--serif);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 6px
}

.dl-info p {
    color: var(--ink-soft);
    font-size: 13.5px;
    line-height: 1.7
}

.dl-tip {
    text-align: center;
    margin-top: 30px;
    color: var(--ink-soft);
    font-size: 13px
}

    .dl-tip b {
        color: var(--cinnabar);
        font-weight: 600
    }

/* ===== 底部 ===== */
.footer {
    border-top: 1px solid var(--line);
    padding: 44px 0 36px;
    text-align: center
}

.footer-brand {
    font-family: var(--serif);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 10px
}

.footer-slogan {
    color: var(--ink-soft);
    font-size: 14px;
    letter-spacing: 2px;
    margin-bottom: 22px
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 26px;
    flex-wrap: wrap;
    margin-bottom: 22px
}

    .footer-links a {
        color: var(--ink-soft);
        font-size: 14px
    }

        .footer-links a:hover {
            color: var(--cinnabar)
        }

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

    .footer-copy .sep {
        margin: 0 8px
    }

/* ===== Toast ===== */
.toast {
    position: fixed;
    left: 50%;
    bottom: 36px;
    transform: translateX(-50%) translateY(20px);
    background: var(--ink);
    color: var(--paper);
    padding: 13px 26px;
    border-radius: 30px;
    font-size: 14px;
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s,transform .3s;
    z-index: 99;
    white-space: nowrap;
}

    .toast.show {
        opacity: 1;
        transform: translateX(-50%) translateY(0)
    }

/* ===== 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
        }

    .split-grid, .entry-grid {
        grid-template-columns: 1fr;
        max-width: 440px;
        margin: 0 auto
    }

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

    .hero {
        padding: 72px 0 60px
    }
}