/* Naval Knowledge Base — 纳瓦尔宝典封面风格 */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700&family=Noto+Sans+SC:wght@300;400;500&display=swap');

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

:root {
    --warm-cream:   #f5e6d3;
    --gold:         #d4a574;
    --deep-brown:   #6b4c3b;
    --dark-espresso:#3e2a1e;
    --light-bg:     #faf6f0;
    --white:        #ffffff;
    --text-main:    #3e2a1e;
    --text-secondary:#6b4c3b;
    --border-light: #e8dcc8;
    --shadow-soft:  0 2px 20px rgba(107,76,59,0.08);
    --shadow-hover: 0 4px 30px rgba(107,76,59,0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--light-bg);
    color: var(--text-main);
    min-height: 100vh;
}

/* ===== 顶部横幅 ===== */
.site-header {
    background: linear-gradient(135deg, var(--warm-cream) 0%, var(--gold) 50%, var(--deep-brown) 100%);
    background-size: 400% 400%;
    animation: gradientShift 12s ease infinite;
    color: var(--dark-espresso);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 20px rgba(62,42,30,0.15);
}

@keyframes gradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-icon {
    font-size: 2.2rem;
    opacity: 0.85;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
}

.header-brand h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--dark-espresso);
    line-height: 1.2;
}

.header-sub {
    font-size: 0.82rem;
    color: var(--deep-brown);
    opacity: 0.8;
    margin-top: 0.15rem;
    letter-spacing: 0.06em;
}

.header-quote {
    font-family: 'Noto Serif SC', serif;
    font-style: italic;
    font-size: 0.95rem;
    color: var(--dark-espresso);
    opacity: 0.7;
    max-width: 420px;
    text-align: right;
    line-height: 1.5;
}

/* ===== 主体布局 ===== */
.site-body {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 90px);
}

/* ===== 侧边栏 ===== */
.sidebar {
    width: 270px;
    min-width: 270px;
    background: var(--white);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 90px;
    height: calc(100vh - 90px);
    overflow: hidden;
    box-shadow: 2px 0 20px rgba(107,76,59,0.04);
}

.sidebar-toggle {
    display: none;
    background: var(--gold);
    color: white;
    border: none;
    font-size: 1.3rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
    position: fixed;
    top: 95px;
    left: 0;
    z-index: 200;
    border-radius: 0 6px 6px 0;
    box-shadow: var(--shadow-soft);
}

.sidebar-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 1.2rem 0;
}

.sidebar-scroll::-webkit-scrollbar {
    width: 4px;
}
.sidebar-scroll::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

.sidebar-section {
    padding: 0 1rem;
    margin-bottom: 0.8rem;
}

.section-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--gold);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.6rem 0.8rem 0.5rem;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 0.3rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.8rem;
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.88rem;
    transition: all 0.2s ease;
    cursor: pointer;
    line-height: 1.4;
}

.nav-item:hover {
    background: var(--light-bg);
    color: var(--deep-brown);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--warm-cream), var(--gold));
    color: var(--dark-espresso);
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(212,165,116,0.25);
}

.nav-icon {
    font-size: 0.75rem;
    opacity: 0.6;
    width: 1.2em;
    text-align: center;
    flex-shrink: 0;
}

.nav-item.active .nav-icon {
    opacity: 1;
}

.sidebar-footer {
    padding: 1rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.6;
    border-top: 1px solid var(--border-light);
}

/* ===== 内容区 ===== */
.content {
    flex: 1;
    padding: 2.5rem 3rem;
    max-width: 820px;
    margin: 0 auto;
}

.content-inner {
    animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===== 首页样式 ===== */
.home-page {
    text-align: center;
}

.home-hero {
    margin-bottom: 3rem;
}

.home-hero h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-espresso);
    margin-bottom: 0.8rem;
    letter-spacing: 0.02em;
}

.home-hero .subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
}

.home-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin: 2.5rem 0;
}

.home-card {
    background: var(--white);
    border-radius: 10px;
    padding: 1.8rem 1.5rem;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--border-light);
    text-align: left;
}

.home-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
    border-color: var(--gold);
}

.home-card h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.05rem;
    color: var(--deep-brown);
    margin-bottom: 0.6rem;
}

.home-card .card-tags {
    font-size: 0.8rem;
    color: var(--gold);
    margin-bottom: 0.6rem;
    letter-spacing: 0.04em;
}

.home-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.home-quote-block {
    margin: 2.5rem auto;
    max-width: 600px;
    padding: 2rem 2.5rem;
    background: linear-gradient(135deg, var(--warm-cream), #f0dcc4);
    border-radius: 10px;
    border-left: 4px solid var(--gold);
}

.home-quote-block blockquote {
    font-family: 'Noto Serif SC', serif;
    font-style: italic;
    font-size: 1.1rem;
    color: var(--deep-brown);
    line-height: 1.8;
    border: none;
    padding: 0;
    background: transparent;
}

.home-how-to {
    margin-top: 2.5rem;
    padding: 2rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow-soft);
    text-align: left;
    border: 1px solid var(--border-light);
}

.home-how-to h3 {
    font-family: 'Noto Serif SC', serif;
    color: var(--deep-brown);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.home-how-to ul {
    list-style: none;
    padding: 0;
}

.home-how-to li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.92rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.home-how-to li::before {
    content: '◈';
    color: var(--gold);
    font-size: 0.7rem;
}

/* ===== 文章页样式 ===== */
.article-page h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--dark-espresso);
    line-height: 1.3;
    margin-bottom: 0.5rem;
    letter-spacing: 0.01em;
}

.article-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    opacity: 0.7;
    margin-bottom: 2rem;
    padding-bottom: 1.2rem;
    border-bottom: 2px solid var(--border-light);
}

.article-body h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--deep-brown);
    margin-top: 2.2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border-light);
}

.article-body h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    margin-top: 1.5rem;
    margin-bottom: 0.7rem;
}

.article-body p {
    margin-bottom: 1.2rem;
    line-height: 1.85;
    color: var(--text-main);
    font-size: 0.95rem;
}

.article-body ul, .article-body ol {
    margin-bottom: 1.2rem;
    padding-left: 1.5rem;
}

.article-body li {
    margin-bottom: 0.5rem;
    line-height: 1.75;
    color: var(--text-main);
    font-size: 0.95rem;
}

.article-body blockquote {
    border-left: 4px solid var(--gold);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    background: linear-gradient(135deg, var(--warm-cream), #f8f0e4);
    border-radius: 0 8px 8px 0;
    font-family: 'Noto Serif SC', serif;
    font-style: italic;
    color: var(--deep-brown);
    line-height: 1.8;
}

.article-body code {
    background: var(--light-bg);
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    font-size: 0.88em;
    color: var(--deep-brown);
    font-family: 'Courier New', monospace;
}

.article-body pre {
    background: var(--dark-espresso);
    color: #d4c5b3;
    padding: 1.2rem 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.88rem;
    line-height: 1.6;
}

.article-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.article-body a {
    color: var(--gold);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s;
}

.article-body a:hover {
    border-bottom-color: var(--gold);
}

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.92rem;
}

.article-body th {
    background: var(--light-bg);
    padding: 0.7rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--deep-brown);
    border-bottom: 2px solid var(--border-light);
}

.article-body td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
}

/* ===== 关于页 ===== */
.about-page {
    max-width: 700px;
    margin: 0 auto;
}

.about-page h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    color: var(--dark-espresso);
    margin-bottom: 1.2rem;
}

.about-page h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.15rem;
    color: var(--deep-brown);
    margin-top: 2rem;
    margin-bottom: 0.8rem;
}

.about-page p {
    line-height: 1.85;
    color: var(--text-main);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
    .sidebar {
        position: fixed;
        left: -270px;
        top: 0;
        height: 100vh;
        z-index: 300;
        transition: left 0.3s ease;
        box-shadow: 4px 0 30px rgba(0,0,0,0.15);
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar-toggle {
        display: block;
    }

    .site-body {
        flex-direction: column;
    }

    .content {
        padding: 1.5rem 1.2rem;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .header-quote {
        text-align: left;
        font-size: 0.85rem;
    }

    .home-hero h2 {
        font-size: 1.5rem;
    }
}

/* ===== 印刷风装饰 ===== */
.print-ornament {
    text-align: center;
    color: var(--gold);
    font-size: 1.2rem;
    margin: 1.5rem 0;
    opacity: 0.6;
    letter-spacing: 0.5em;
}

/* ===== 标签 ===== */
.tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.78rem;
    background: var(--light-bg);
    color: var(--text-secondary);
    margin-right: 0.4rem;
    margin-bottom: 0.4rem;
}

.tag.gold {
    background: linear-gradient(135deg, var(--warm-cream), var(--gold));
    color: var(--dark-espresso);
}