/* ============================================================
   NC解码 官网 — 统一样式
   配色：深蓝 #0A1628 → #0D2149，金色强调 #F5B800
   ============================================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-dark:    #0A1628;
    --bg-section: #0D2149;
    --bg-card:    #122555;
    --bg-code:    #0B1A3A;
    --gold:       #F5B800;
    --gold-light: #FFD966;
    --text:       #C8DCEE;
    --text-dim:   #7AAAD4;
    --text-bright:#FFFFFF;
    --border:     #1E3A6E;
    --accent-blue:#3A78C9;
    --success:    #27ae60;
    --danger:     #e74c3c;
    --warning:    #f39c12;
    --info:       #3498db;
    --radius:     8px;
}

html { scroll-behavior: smooth; overflow-y: scroll; }

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg-dark);
    min-height: 100vh;
}

a { color: var(--gold); text-decoration: none; transition: color .2s; }
a:hover { color: var(--gold-light); }

img { max-width: 100%; height: auto; }

/* ---------- Navigation ---------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 22, 40, .92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
}

.navbar .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.navbar .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-bright);
}

.navbar .logo img { width: 32px; height: 32px; }

.navbar nav { display: flex; gap: 4px; }

.navbar nav a {
    color: var(--text-dim);
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    transition: all .2s;
}

.navbar nav a:hover,
.navbar nav a.active {
    color: var(--gold);
    background: rgba(245, 184, 0, .08);
}

/* Mobile hamburger */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 24px;
    cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
    text-align: center;
    padding: 80px 24px 60px;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-section) 100%);
}

.hero .logo-large { width: 96px; height: 96px; margin-bottom: 20px; }
.hero h1 { font-size: 40px; color: var(--text-bright); margin-bottom: 12px; }
.hero .subtitle { font-size: 18px; color: var(--text-dim); margin-bottom: 32px; }

.hero .btn-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all .2s;
}

.btn-primary {
    background: var(--gold);
    color: var(--bg-dark);
}
.btn-primary:hover { background: var(--gold-light); color: var(--bg-dark); }

.btn-outline {
    background: transparent;
    color: var(--gold);
    border: 1.5px solid var(--gold);
}
.btn-outline:hover { background: rgba(245, 184, 0, .1); }

/* ---------- Sections ---------- */
.section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
}

.section-title {
    font-size: 28px;
    color: var(--text-bright);
    margin-bottom: 8px;
}

.section-desc {
    color: var(--text-dim);
    margin-bottom: 36px;
}

/* ---------- Feature Cards ---------- */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: transform .2s, border-color .2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--gold);
}

.feature-card .icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.feature-card h3 {
    color: var(--text-bright);
    font-size: 18px;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-dim);
    font-size: 14px;
}

/* ---------- Content Pages with Sidebar ---------- */
.page-with-sidebar {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 0;
    padding: 0 24px;
}

/* Sidebar */
.sidebar {
    width: 220px;
    flex-shrink: 0;
    position: sticky;
    top: 72px;
    align-self: flex-start;
    max-height: calc(100vh - 84px);
    overflow-y: auto;
    padding: 24px 0;
    border-right: 1px solid var(--border);
}

.sidebar-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0 16px 10px;
}

.sidebar a {
    display: block;
    padding: 7px 16px;
    font-size: 13px;
    color: var(--text-dim);
    border-left: 2px solid transparent;
    transition: all .15s;
    line-height: 1.4;
}

.sidebar a:hover {
    color: var(--text-bright);
    background: rgba(245, 184, 0, .04);
}

.sidebar a.active {
    color: var(--gold);
    border-left-color: var(--gold);
    background: rgba(245, 184, 0, .06);
}

/* Content area next to sidebar */
.content-page {
    max-width: 900px;
    flex: 1;
    min-width: 0;
    padding: 40px 24px 80px 40px;
}

/* Standalone content page (no sidebar) */
.content-page-standalone {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

@media (max-width: 768px) {
    .page-with-sidebar { flex-direction: column; }
    .sidebar {
        position: static;
        width: 100%;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 16px 0;
        display: flex;
        flex-wrap: wrap;
        gap: 0;
    }
    .sidebar-title { width: 100%; padding-bottom: 8px; }
    .sidebar a { border-left: none; padding: 5px 12px; }
    .sidebar a.active { border-left: none; background: rgba(245,184,0,.1); border-radius: var(--radius); }
    .content-page { padding-left: 24px; }
}

.content-page h1,
.content-page-standalone h1 {
    font-size: 32px;
    color: var(--text-bright);
    border-bottom: 2px solid var(--gold);
    padding-bottom: 12px;
    margin-bottom: 32px;
}

.content-page h2,
.content-page-standalone h2 {
    font-size: 22px;
    color: var(--gold);
    margin-top: 40px;
    margin-bottom: 16px;
    border-left: 3px solid var(--gold);
    padding-left: 14px;
}

.content-page h3,
.content-page-standalone h3 {
    font-size: 17px;
    color: var(--text-bright);
    margin-top: 24px;
    margin-bottom: 12px;
}

.content-page p,
.content-page-standalone p { margin-bottom: 14px; }
.content-page ul,
.content-page ol,
.content-page-standalone ul,
.content-page-standalone ol { margin-left: 28px; margin-bottom: 14px; }
.content-page li,
.content-page-standalone li { margin-bottom: 6px; }

/* ---------- Code ---------- */
code {
    background: var(--bg-code);
    padding: 2px 7px;
    border-radius: 4px;
    font-family: "Cascadia Code", "Consolas", monospace;
    color: var(--gold-light);
    font-size: 13px;
}

pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    overflow-x: auto;
    margin: 16px 0;
    line-height: 1.5;
}

pre code { background: transparent; padding: 0; color: var(--text); }

/* ---------- Tables ---------- */
.content-page table,
.content-page-standalone table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 24px;
}

.content-page table th,
.content-page-standalone table th {
    background: var(--bg-card);
    color: var(--gold);
    padding: 10px 14px;
    text-align: left;
    font-size: 14px;
    border: 1px solid var(--border);
}

.content-page table td,
.content-page-standalone table td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    font-size: 14px;
}

.content-page table tr:hover,
.content-page-standalone table tr:hover { background: rgba(58, 120, 201, .06); }

/* ---------- Alerts ---------- */
.alert {
    padding: 14px 18px;
    margin: 16px 0;
    border-radius: var(--radius);
    border-left: 4px solid;
    font-size: 14px;
}

.alert-info    { background: rgba(52,152,219,.1);  border-color: var(--info);    }
.alert-warning { background: rgba(243,156,18,.1);  border-color: var(--warning); }
.alert-success { background: rgba(39,174,96,.1);   border-color: var(--success); }
.alert-danger  { background: rgba(231,76,60,.1);   border-color: var(--danger);  }

.alert strong { color: var(--text-bright); }

/* ---------- Badges ---------- */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
}

.badge-required { background: var(--danger);  color: #fff; }
.badge-optional { background: #555;           color: #ccc; }
.badge-http     { background: var(--info);    color: #fff; }
.badge-socks5   { background: #9b59b6;        color: #fff; }
.badge-api      { background: var(--warning); color: #fff; }

/* ---------- Flow Steps ---------- */
.flow-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 14px 14px 52px;
    margin: 8px 0;
    position: relative;
}

.flow-step .step-num {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    background: var(--gold);
    color: var(--bg-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 13px;
}

/* ---------- FAQ Accordion ---------- */
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
    overflow: hidden;
}

.faq-question {
    padding: 16px 18px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-bright);
    font-weight: 600;
    transition: background .2s;
}

.faq-question:hover { background: rgba(245, 184, 0, .05); }

.faq-question::after {
    content: "+";
    font-size: 20px;
    color: var(--gold);
    transition: transform .2s;
}

.faq-item.open .faq-question::after { transform: rotate(45deg); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease;
    padding: 0 18px;
    color: var(--text-dim);
    font-size: 14px;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 0 18px 16px;
}

/* ---------- Changelog ---------- */
.changelog-entry {
    border-left: 2px solid var(--gold);
    padding-left: 20px;
    margin-bottom: 32px;
    position: relative;
}

.changelog-entry::before {
    content: "";
    position: absolute;
    left: -6px;
    top: 6px;
    width: 10px;
    height: 10px;
    background: var(--gold);
    border-radius: 50%;
}

.changelog-entry .version {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-bright);
}

.changelog-entry .date {
    font-size: 13px;
    color: var(--text-dim);
    margin-bottom: 8px;
}

.changelog-entry ul { margin-left: 20px; }
.changelog-entry li { margin-bottom: 4px; font-size: 14px; }

/* ---------- Download ---------- */
.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
    max-width: 480px;
    margin: 0 auto;
}

.download-card .version-label {
    font-size: 14px;
    color: var(--text-dim);
    margin-bottom: 4px;
}

.download-card .version-num {
    font-size: 28px;
    font-weight: 700;
    color: var(--gold);
    margin-bottom: 20px;
}

/* ---------- Pricing ---------- */
.pricing-card {
    background: var(--bg-card);
    border: 2px solid var(--gold);
    border-radius: var(--radius);
    padding: 40px 36px;
    text-align: center;
    max-width: 420px;
    margin: 0 auto;
}

.pricing-card .price-amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--gold);
    line-height: 1;
    margin-bottom: 4px;
}

.pricing-card .price-unit {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-dim);
}

.pricing-card .price-note {
    font-size: 14px;
    color: var(--text-dim);
    margin: 8px 0 24px;
}

.pricing-features {
    text-align: left;
    margin: 0 auto 28px;
    max-width: 300px;
}

.pricing-features li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    color: var(--text);
    list-style: none;
}

.pricing-features li::before {
    content: "\2713";
    color: var(--success);
    font-weight: 700;
    margin-right: 10px;
}

/* ---------- Footer ---------- */
.footer {
    text-align: center;
    padding: 28px 24px;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 13px;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .navbar nav { display: none; }
    .navbar nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-dark);
        border-bottom: 1px solid var(--border);
        padding: 12px;
    }
    .menu-toggle { display: block; }
    .hero h1 { font-size: 28px; }
    .features { grid-template-columns: 1fr; }
}