/* ============ 百香集 · 全站公共导航与页脚样式 ============ */
:root {
    --paper: #F6EFE2;
    --paper-alt: #EFE4D0;
    --card: #FBF7EE;
    --nav: #ECE1CF;
    --ink: #3D3226;
    --ink-2: #6B5A47;
    --ink-3: #9A8B76;
    --line: #D8C9B4;
    --accent: #8C5A3A;
    --accent-2: #A63D2F;
    --cyan: #629492;
    --font-title: "SimSun", "Songti SC", "STSong", "Noto Serif SC", serif;
    --font-body: "Microsoft YaHei", "PingFang SC", "Microsoft YaHei UI", sans-serif;
    --font-deco: "KaiTi", "STKaiti", "KaiTi_GB2312", serif;
    --shadow-hover: 0 14px 34px rgba(74, 58, 35, 0.20);
    --shadow-card: 0 6px 20px rgba(74, 58, 35, 0.10);
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.9;
    padding-top: 62px;
    -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

.site {
    max-width: 1920px;
    margin: 0 auto;
    background: var(--paper);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ============ 顶部导航 ============ */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--nav);
    border-bottom: 1px solid var(--line);
}

.nav-wrap {
    max-width: 1400px;
    margin: 0 auto;
    height: 62px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo img { height: 34px; width: auto; }

.nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform .25s ease, opacity .25s 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); }

nav[aria-label="主导航"] {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.nav-main { display: flex; gap: 8px; }

.nav-item { position: relative; }

.nav-item > a {
    display: block;
    padding: 8px 18px;
    font-size: 15px;
    color: var(--ink);
    letter-spacing: 1px;
    border-radius: 4px;
    transition: color .2s ease, background .2s ease;
    white-space: nowrap;
}

.nav-item > a:hover,
.nav-item.current > a {
    color: var(--accent-2);
    background: rgba(255, 255, 255, 0.5);
}

.nav-item > a::after {
    content: "";
    display: block;
    height: 2px;
    width: 0;
    margin: 2px auto 0;
    background: var(--accent-2);
    transition: width .25s ease;
}

.nav-item > a:hover::after,
.nav-item.current > a::after { width: 100%; }

/* 二级菜单：从上往下展开 */
.nav-sub {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 170px;
    background: var(--card);
    border: 1px solid var(--line);
    border-top: 2px solid var(--accent);
    border-radius: 0 0 6px 6px;
    box-shadow: 0 14px 30px rgba(74, 58, 35, 0.12);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-14px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
    z-index: 60;
}

.nav-item:hover .nav-sub,
.nav-item:focus-within .nav-sub {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-sub li a {
    display: block;
    padding: 9px 20px;
    font-size: 13px;
    color: var(--ink-2);
    white-space: nowrap;
    transition: color .2s ease, background .2s ease, padding-left .2s ease;
}

.nav-sub li a:hover { color: var(--accent-2); background: var(--paper-alt); padding-left: 26px; }

.nav-sub li a.active { color: var(--accent-2); font-weight: 600; }

/* ============ 页脚 ============ */
footer {
    border-top: 1px solid var(--line);
    background: var(--paper-alt);
    padding: 40px 0;
    text-align: center;
}

.foot-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.foot-brand {
    font-family: var(--font-deco);
    font-size: 15px;
    color: var(--ink-2);
    letter-spacing: 4px;
    margin-bottom: 6px;
}

footer p:last-child {
    font-size: 12px;
    color: var(--ink-3);
    letter-spacing: 1px;
}

/* ============ Toast ============ */
.toast {
    position: fixed;
    left: 50%;
    bottom: 44px;
    transform: translateX(-50%) translateY(20px);
    background: var(--ink);
    color: var(--paper);
    font-size: 13px;
    letter-spacing: 1px;
    padding: 11px 26px;
    border-radius: 999px;
    box-shadow: 0 10px 28px rgba(61, 50, 38, 0.28);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease, transform .3s ease, visibility .3s;
    z-index: 300;
    pointer-events: none;
}

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

/* ============ 滚动显现 ============ */
.reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity .7s ease, transform .7s ease;
}

.reveal.in {
    opacity: 1;
    transform: translateY(0);
}

/* ============ 响应式 ============ */
@media (max-width: 1180px) {
    .container { padding: 0 24px; }
    .nav-wrap { padding: 0 24px; }
}

@media (max-width: 900px) {
    .nav-toggle { display: flex; }
    nav[aria-label="主导航"] {
        position: fixed;
        left: 0;
        top: 62px;
        width: 100%;
        transform: none;
        background: var(--nav);
        border-bottom: 1px solid var(--line);
        box-shadow: 0 16px 30px rgba(74, 58, 35, 0.12);
        max-height: calc(100vh - 62px);
        overflow-y: auto;
        display: none;
        padding: 12px 20px 24px;
    }
    .top-nav.open nav[aria-label="主导航"] { display: block; }
    .nav-main { flex-direction: column; gap: 4px; }
    .nav-item > a { padding: 12px 10px; font-size: 15px; }
    .nav-sub {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        border-left: 2px solid var(--accent);
        border-radius: 0;
        margin: 0 0 6px 16px;
        padding: 4px 0;
        background: transparent;
        display: none;
    }
    .nav-item.sub-open .nav-sub { display: block; }
}

@media (max-width: 600px) {
    .container { padding: 0 16px; }
    .nav-wrap { padding: 0 16px; }
}