/* ==========================================================================
   南诺方邦建站 nnfb.cn — 全站基础样式
   治愈温柔风：奶黄 + 浅粉 + 奶白
   纯手工定制，无任何框架依赖
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计变量
   -------------------------------------------------------------------------- */
:root {
    /* 色板 */
    --cream:        #FFF9F0;   /* 全站底色 · 奶白偏黄 */
    --milk:         #FFFDF9;   /* 卡片底 · 奶白 */
    --butter:       #F2C063;   /* 主色 · 奶黄 */
    --butter-soft:  #FAE7BF;   /* 奶黄浅 */
    --butter-deep:  #C9862B;   /* 奶黄深（文字可读级） */
    --pink:         #F2A9B4;   /* 辅色 · 浅粉 */
    --pink-soft:    #FBDDE2;   /* 浅粉底 */
    --pink-deep:    #C96E7E;   /* 浅粉深 */
    --ink:          #453729;   /* 标题墨色 */
    --ink-body:     #6C5A49;   /* 正文 */
    --ink-mute:     #9A8875;   /* 弱化文字 */
    --line:         #F0E2CE;   /* 分割线 */
    --shadow:       0 18px 46px rgba(196, 152, 88, .16);
    --shadow-sm:    0 8px 22px rgba(196, 152, 88, .12);

    /* 字体 */
    --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --serif: Georgia, "Songti SC", "SimSun", serif;

    /* 圆角与节奏 */
    --r-lg: 26px;
    --r-md: 18px;
    --r-sm: 12px;
    --gap: 24px;
    --header-h: 117px;  /* 固定页头高度（JS 动态覆写，此处为 fallback） */
}

/* --------------------------------------------------------------------------
   2. 重置
   -------------------------------------------------------------------------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.85;
    color: var(--ink-body);
    background: var(--cream);
    overflow-x: hidden;
    letter-spacing: .02em;
}

img { max-width: 100%; height: auto; display: block; border: 0; }

ul, ol { list-style: none; }

a {
    color: var(--butter-deep);
    text-decoration: none;
    transition: color .3s ease;
}
a:hover { color: var(--pink-deep); }

em, i { font-style: normal; }
strong { font-weight: 700; color: var(--ink); }

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

h1, h2, h3, h4, h5 {
    font-weight: 700;
    color: var(--ink);
    line-height: 1.4;
    letter-spacing: .04em;
}

/* --------------------------------------------------------------------------
   3. 版心与分区
   -------------------------------------------------------------------------- */
.container {
    width: min(1200px, 92%);
    margin: 0 auto;
}

.section { padding: 96px 0; position: relative; }
.section-tight { padding: 72px 0; }

/* 分区题头 · 左线梳型（内页通用，各页可覆写排版） */
.sec-head { margin-bottom: 48px; }
.sec-kicker {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    letter-spacing: .35em;
    color: var(--pink-deep);
    margin-bottom: 14px;
}
.sec-kicker::before {
    content: "";
    width: 26px; height: 2px;
    background: var(--butter);
    border-radius: 2px;
}
.sec-title { font-size: clamp(26px, 3.4vw, 38px); }
.sec-sub { margin-top: 12px; color: var(--ink-mute); font-size: 15px; max-width: 620px; }

/* --------------------------------------------------------------------------
   4. 按钮
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 34px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: .12em;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform .35s ease, box-shadow .35s ease, background .35s ease, color .35s ease, border-color .35s ease;
}
.btn:hover { transform: translateY(-3px); }

.btn-butter {
    background: linear-gradient(135deg, var(--butter) 0%, #EBAF54 100%);
    color: #5C3D0E;
    box-shadow: 0 12px 26px rgba(233, 172, 84, .38);
}
.btn-butter:hover { color: #4A2F06; box-shadow: 0 16px 32px rgba(233, 172, 84, .5); }

.btn-pink {
    background: linear-gradient(135deg, var(--pink) 0%, #E58E9E 100%);
    color: #6B2231;
    box-shadow: 0 12px 26px rgba(232, 148, 165, .36);
}
.btn-pink:hover { color: #54141f; }

.btn-ghost {
    background: transparent;
    border-color: var(--butter);
    color: var(--butter-deep);
}
.btn-ghost:hover { background: var(--butter-soft); }

.btn-plain {
    background: var(--milk);
    border-color: var(--line);
    color: var(--ink);
    box-shadow: var(--shadow-sm);
}

/* 文本链接箭头 */
.link-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: .14em;
}
.link-more svg { transition: transform .3s ease; }
.link-more:hover svg { transform: translateX(5px); }

/* --------------------------------------------------------------------------
   5. 顶部导航（全站统一）
   -------------------------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    transition: transform .4s ease;
}

/* 顶条 */
.header-top {
    background: linear-gradient(90deg, #FBEDD3 0%, #F9E0E4 100%);
    font-size: 12.5px;
    color: var(--ink-body);
    transition: height .3s ease;
}
.header-top-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 38px;
}
.header-top-info { display: flex; align-items: center; gap: 22px; }
.header-top-info a:hover { color: var(--pink-deep); }
.top-hotline { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; }

/* 主栏 */
.header-main {
    background: rgba(255, 253, 249, .88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(240, 226, 206, .8);
    transition: background .35s ease, box-shadow .35s ease;
}
.header-main-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 78px;
    gap: 20px;
}

/* 品牌 */
.brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark {
    width: 46px; height: 46px;
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong {
    font-size: 21px;
    letter-spacing: .18em;
    color: var(--ink);
}
.brand-text em {
    font-size: 10.5px;
    letter-spacing: .22em;
    color: var(--ink-mute);
}

/* 主导航 */
.main-nav > ul { display: flex; align-items: center; gap: 4px; }
.main-nav > ul > li { position: relative; }
.main-nav > ul > li > a {
    display: block;
    padding: 10px 15px;
    font-size: 15.5px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: .08em;
    border-radius: 999px;
    transition: color .3s ease, background .3s ease;
}
.main-nav > ul > li > a:hover { color: var(--butter-deep); background: var(--butter-soft); }
.main-nav > ul > li.active > a { color: var(--pink-deep); }

/* 当前页小圆点 */
.main-nav > ul > li.active > a::after {
    content: "";
    display: block;
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--pink);
    margin: 2px auto 0;
}

/* 下拉（桌面） */
.sub-menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 196px;
    background: var(--milk);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: var(--shadow);
    padding: 12px;
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease, transform .3s ease, visibility .3s;
}
.sub-menu::before {
    content: "";
    position: absolute;
    top: -12px; left: 0; right: 0;
    height: 12px;
}
.sub-menu li a {
    display: block;
    padding: 9px 16px;
    font-size: 14px;
    color: var(--ink-body);
    border-radius: 10px;
    letter-spacing: .06em;
    white-space: nowrap;
}
.sub-menu li a:hover { background: var(--pink-soft); color: var(--pink-deep); }
.has-sub:hover > .sub-menu,
.has-sub:focus-within > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}
/* 双列下拉（服务/方案） */
.sub-menu.cols { min-width: 420px; display: grid; grid-template-columns: 1fr 1fr; gap: 2px 10px; }
.sub-menu .menu-note {
    grid-column: 1 / -1;
    font-size: 12px;
    color: var(--ink-mute);
    padding: 4px 16px 8px;
    border-bottom: 1px dashed var(--line);
    margin-bottom: 6px;
    letter-spacing: .2em;
}

/* 头部按钮 */
.header-cta { flex-shrink: 0; }
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px; height: 44px;
    background: var(--milk);
    border: 1px solid var(--line);
    border-radius: 12px;
    cursor: pointer;
    padding: 10px;
}
.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform .35s ease, opacity .3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 滚动后的头部 */
.site-header.scrolled .header-top { height: 0; overflow: hidden; }
.site-header.scrolled .header-top-inner { height: 0; overflow: hidden; }
.site-header.scrolled .header-main {
    background: rgba(255, 253, 249, .97);
    box-shadow: 0 10px 30px rgba(196, 152, 88, .14);
}

/* 移动端菜单 */
.m-menu {
    position: fixed;
    top: 0; right: -86%;
    width: 82%;
    max-width: 360px;
    height: 100vh;
    background: var(--milk);
    z-index: 1200;
    padding: 86px 26px 40px;
    overflow-y: auto;
    transition: right .45s cubic-bezier(.22, .9, .3, 1);
    box-shadow: -20px 0 60px rgba(69, 55, 41, .12);
}
.m-menu.open { right: 0; }
.m-mask {
    position: fixed;
    inset: 0;
    background: rgba(69, 55, 41, .38);
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transition: opacity .4s ease, visibility .4s;
}
.m-mask.show { opacity: 1; visibility: visible; }
.m-close {
    position: absolute;
    top: 24px; right: 22px;
    width: 40px; height: 40px;
    border: 1px solid var(--line);
    background: var(--cream);
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    color: var(--ink);
    line-height: 1;
}
.m-menu > ul > li { border-bottom: 1px dashed var(--line); }
.m-menu > ul > li > a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 4px;
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: .1em;
}
.m-menu > ul > li.active > a { color: var(--pink-deep); }
.m-arrow {
    width: 22px; height: 22px;
    border-right: 2px solid var(--butter-deep);
    border-bottom: 2px solid var(--butter-deep);
    transform: rotate(45deg);
    transition: transform .3s ease;
    flex-shrink: 0;
}
li.open .m-arrow { transform: rotate(-135deg); }
.m-sub { display: none; padding: 2px 0 14px 12px; }
li.open .m-sub { display: block; }
.m-sub a {
    display: block;
    padding: 8px 0;
    font-size: 14px;
    color: var(--ink-body);
}
.m-sub a:hover { color: var(--pink-deep); }
.m-menu .m-cta { margin-top: 26px; width: 100%; }

/* --------------------------------------------------------------------------
   6. 面包屑（内页通用）
   -------------------------------------------------------------------------- */
.crumb {
    background: linear-gradient(90deg, var(--butter-soft) 0%, var(--pink-soft) 100%);
    border-bottom: 1px solid var(--line);
}
.crumb-inner {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    height: 52px;
    font-size: 13.5px;
    color: var(--ink-mute);
    letter-spacing: .08em;
}
.crumb a { color: var(--ink-body); }
.crumb a:hover { color: var(--pink-deep); }
.crumb .crumb-sep { color: var(--butter-deep); }
.crumb em { color: var(--pink-deep); font-weight: 600; }

/* --------------------------------------------------------------------------
   7. 页脚（全站统一）
   -------------------------------------------------------------------------- */
.site-footer {
    margin-top: 90px;
    background:
        radial-gradient(600px 240px at 8% 0%, rgba(250, 231, 191, .55) 0%, transparent 70%),
        radial-gradient(520px 220px at 92% 10%, rgba(251, 221, 226, .5) 0%, transparent 70%),
        #40342A;
    color: #CBB9A6;
}
.footer-wave { display: block; width: 100%; height: 46px; margin-bottom: -1px; }
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
    gap: 42px;
    padding: 62px 0 46px;
}
.footer-brand .brand { margin-bottom: 18px; }
.footer-brand .brand-text strong { color: #FFF3E2; }
.footer-brand .brand-text em { color: #A6947F; }
.footer-brand p { font-size: 13.5px; line-height: 2; color: #B4A28E; }
.footer-hotline {
    margin-top: 18px;
    padding: 14px 18px;
    background: rgba(255, 244, 224, .06);
    border: 1px dashed rgba(242, 192, 99, .35);
    border-radius: var(--r-md);
}
.footer-hotline span { display: block; font-size: 12px; letter-spacing: .2em; color: #A6947F; }
.footer-hotline strong { display: block; font-size: 22px; color: var(--butter); letter-spacing: .06em; }
.footer-col h4 {
    color: #FFF3E2;
    font-size: 15.5px;
    letter-spacing: .22em;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 12px;
}
.footer-col h4::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 28px; height: 2px;
    background: var(--pink);
    border-radius: 2px;
}
.footer-col li { margin-bottom: 10px; }
.footer-col li a {
    color: #B4A28E;
    font-size: 13.5px;
    letter-spacing: .06em;
    transition: color .3s ease, padding-left .3s ease;
}
.footer-col li a:hover { color: var(--butter); padding-left: 6px; }
.footer-contact li {
    display: flex;
    gap: 10px;
    font-size: 13.5px;
    line-height: 1.9;
}
.footer-contact svg { flex-shrink: 0; margin-top: 6px; }
.footer-bottom {
    border-top: 1px solid rgba(203, 185, 166, .16);
    padding: 22px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 12.5px;
    color: #9C8A76;
    letter-spacing: .06em;
}
.footer-bottom a { color: #B4A28E; }
.footer-bottom a:hover { color: var(--butter); }
.footer-icp a { display: inline-flex; align-items: center; gap: 6px; }

/* --------------------------------------------------------------------------
   8. 返回顶部
   -------------------------------------------------------------------------- */
.back-top {
    position: fixed;
    right: 26px; bottom: 30px;
    width: 48px; height: 48px;
    border-radius: 50%;
    border: 1px solid var(--line);
    background: var(--milk);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px);
    transition: all .4s ease;
    z-index: 900;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--butter-soft); }

/* --------------------------------------------------------------------------
   9. 表单
   -------------------------------------------------------------------------- */
.field { margin-bottom: 20px; }
.field label {
    display: block;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: .1em;
    margin-bottom: 8px;
}
.field label em { color: var(--pink-deep); margin-left: 4px; }
.field input,
.field select,
.field textarea {
    width: 100%;
    padding: 13px 18px;
    border: 1px solid var(--line);
    border-radius: var(--r-sm);
    background: var(--milk);
    color: var(--ink-body);
    outline: none;
    transition: border-color .3s ease, box-shadow .3s ease;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
    border-color: var(--butter);
    box-shadow: 0 0 0 4px rgba(242, 192, 99, .18);
}
.field textarea { min-height: 130px; resize: vertical; }
.form-toast {
    position: fixed;
    left: 50%;
    bottom: 44px;
    transform: translateX(-50%) translateY(20px);
    background: var(--ink);
    color: #FFF3E2;
    padding: 13px 30px;
    border-radius: 999px;
    font-size: 14px;
    letter-spacing: .1em;
    opacity: 0;
    visibility: hidden;
    transition: all .4s ease;
    z-index: 1500;
}
.form-toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* --------------------------------------------------------------------------
   10. 滚动渐入动画
   -------------------------------------------------------------------------- */
.reveal {
    opacity: 0;
    transform: translateY(36px);
    transition: opacity .9s cubic-bezier(.22, .6, .3, 1), transform .9s cubic-bezier(.22, .6, .3, 1);
    will-change: opacity, transform;
}
.reveal-l { transform: translateX(-46px); }
.reveal-r { transform: translateX(46px); }
.reveal-scale { transform: scale(.92); }
.reveal.in { opacity: 1; transform: none; }

/* 页面进场 */
.page-fade { animation: pageIn .7s ease both; }
@keyframes pageIn {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: none; }
}

/* 漂浮装饰（治愈感） */
@keyframes floaty {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-16px) rotate(2deg); }
}
@keyframes floatySlow {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* --------------------------------------------------------------------------
   11. 工具类
   -------------------------------------------------------------------------- */
.text-pink { color: var(--pink-deep); }
.text-butter { color: var(--butter-deep); }
.mute { color: var(--ink-mute); }
.center { text-align: center; }
.center .sec-sub { margin-left: auto; margin-right: auto; }

/* 通用数字体 */
.num { font-family: var(--serif); font-weight: 700; }

/* --------------------------------------------------------------------------
   12. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
    .main-nav { display: none; }
    .nav-toggle { display: flex; }
    .header-cta { display: none; }
    .header-top { display: none; }
    .header-main { background: rgba(255, 253, 249, .96); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 34px; }
}

@media (max-width: 640px) {
    .section { padding: 64px 0; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; padding: 48px 0 36px; }
    .footer-bottom { justify-content: center; text-align: center; }
    .brand-text strong { font-size: 18px; }
    .header-main-inner { height: 66px; }
}