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

:root {
    --jvav-dark: #0B1D35;
    --jvav-mid: #1E4D7A;
    --jvav-light: #2C7FB8;
    --java-orange: #E76F00;
    --java-gold: #F8981D;
    --text-dark: #1F2937;
    --text-mid: #4B5563;
    --text-light: #6B7280;
    --bg-gray: #F3F4F6;
    --border: #E5E7EB;
    --card-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --card-shadow-hover: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background: #fff;
    -webkit-font-smoothing: antialiased;
}

/* Deprecation banner */
.deprecation-banner {
    background: linear-gradient(135deg, var(--jvav-dark) 0%, var(--jvav-mid) 100%);
    color: rgba(255,255,255,0.92);
    border-bottom: 2px solid var(--java-orange);
    padding: 0;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.6;
    position: relative;
    z-index: 101;
}
.deprecation-banner::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--java-gold), transparent);
    opacity: 0.6;
}
.deprecation-banner-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px 16px;
}
.deprecation-banner a {
    color: var(--java-gold);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid rgba(248,152,29,0.4);
    transition: all 0.2s;
}
.deprecation-banner a:hover {
    color: #fff;
    border-bottom-color: var(--java-gold);
}
.deprecation-banner .sep {
    color: rgba(255,255,255,0.25);
    font-weight: 300;
    user-select: none;
}
@media (max-width: 768px) {
    .deprecation-banner-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
        padding: 10px 16px;
        font-size: 12px;
    }
    .deprecation-banner .sep {
        display: none;
    }
}

/* Oracle-style top accent bar */
.oracle-bar {
    background: linear-gradient(90deg, var(--java-orange), var(--java-gold));
    height: 4px;
    width: 100%;
}

/* Header / Navbar */
.header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255,255,255,0.95);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo-mark {
    position: relative;
    display: inline-block;
    height: 34px;
    cursor: pointer;
}

.logo-text-full {
    font-size: 24px;
    font-weight: 800;
    color: #d0d5dd;
    letter-spacing: 3px;
    user-select: none;
}

.logo-text-main {
    position: absolute;
    top: 0;
    left: 0;
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 3px;
    background: linear-gradient(110deg, var(--jvav-mid) 52%, transparent 52%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    user-select: none;
}

.logo-knife {
    position: absolute;
    top: -4px;
    left: 52%;
    width: 3px;
    height: 130%;
    background: linear-gradient(180deg, var(--java-orange), var(--java-gold));
    transform: rotate(20deg);
    border-radius: 2px;
    box-shadow: 0 0 10px rgba(231,111,0,0.6), 2px 0 4px rgba(0,0,0,0.1);
    z-index: 2;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.logo-mark:hover .logo-knife {
    transform: rotate(20deg) scaleY(1.15);
    box-shadow: 0 0 16px rgba(231,111,0,0.8), 2px 0 6px rgba(0,0,0,0.15);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: 14px;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
    transition: color 0.2s;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--java-orange), var(--java-gold));
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--jvav-light);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--jvav-mid);
    font-weight: 600;
}

.nav-links a.active::after {
    width: 100%;
}

.nav-cta {
    background: linear-gradient(135deg, var(--java-orange), var(--java-gold));
    color: #fff !important;
    padding: 6px 16px;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none !important;
    transition: transform 0.2s, box-shadow 0.2s;
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(231,111,0,0.35);
}

.nav-cta::after { display: none !important; }

.lang-switch {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-mid);
    padding: 4px 12px;
    cursor: pointer;
    font-size: 12px;
    border-radius: 4px;
    transition: all 0.2s;
}

.lang-switch:hover {
    border-color: var(--jvav-light);
    color: var(--jvav-light);
}

/* Hero - Java官网风格 */
.hero {
    background: linear-gradient(135deg, var(--jvav-dark) 0%, var(--jvav-mid) 50%, var(--jvav-light) 100%);
    padding: 80px 24px 64px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(248,152,29,0.12) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(46,127,184,0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 64px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    letter-spacing: -2px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.2);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 24px;
    color: rgba(255,255,255,0.9);
    margin-bottom: 20px;
    font-weight: 300;
    animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.75);
    max-width: 560px;
    margin-bottom: 32px;
    line-height: 1.7;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--java-orange), var(--java-gold));
    color: #fff;
    box-shadow: 0 4px 16px rgba(231,111,0,0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(231,111,0,0.45);
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.3);
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.5);
    transform: translateY(-2px);
}

/* Version badge */
.version-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    color: rgba(255,255,255,0.8);
    margin-top: 24px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.version-badge .tag {
    background: var(--java-gold);
    color: var(--jvav-dark);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
}

/* Main layout */
.main {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    min-height: 400px;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: #fff;
    border-right: 1px solid var(--border);
    padding: 24px 0;
    flex-shrink: 0;
}

.sidebar h4 {
    font-size: 11px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0 20px 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
    font-weight: 600;
}

.sidebar ul {
    list-style: none;
    margin-bottom: 24px;
}

.sidebar li a {
    display: block;
    padding: 6px 20px;
    font-size: 13px;
    color: var(--text-mid);
    text-decoration: none;
    border-radius: 0 4px 4px 0;
    margin-right: 12px;
    transition: all 0.2s;
}

.sidebar li a:hover {
    background: var(--bg-gray);
    color: var(--jvav-mid);
}

.sidebar li a.active {
    background: linear-gradient(90deg, rgba(46,127,184,0.1), transparent);
    color: var(--jvav-mid);
    font-weight: 600;
    border-right: 3px solid var(--jvav-light);
}

/* Content */
.content {
    flex: 1;
    padding: 32px 40px;
    background: #fff;
    min-height: 500px;
}

.content h2 {
    font-size: 28px;
    color: var(--jvav-dark);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border);
    font-weight: 700;
}

.content h3 {
    font-size: 20px;
    color: var(--jvav-mid);
    margin: 28px 0 12px;
    font-weight: 600;
}

.content h4 {
    font-size: 15px;
    color: var(--text-dark);
    margin: 20px 0 8px;
    font-weight: 600;
}

.content p {
    font-size: 14px;
    color: var(--text-mid);
    margin-bottom: 14px;
    line-height: 1.7;
}

.content a {
    color: var(--jvav-light);
    text-decoration: none;
    font-weight: 500;
}

.content a:hover {
    text-decoration: underline;
}

.content ul, .content ol {
    font-size: 14px;
    color: var(--text-mid);
    margin: 0 0 14px 24px;
}

.content li {
    margin-bottom: 6px;
}

.content code {
    font-family: "JetBrains Mono", "Fira Code", "Courier New", monospace;
    font-size: 13px;
    background: var(--bg-gray);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--java-orange);
}

/* Feature / stdlib tables */
.feature-table, .stdlib-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 16px 0;
    font-size: 14px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.feature-table th, .feature-table td,
.stdlib-table th, .stdlib-table td {
    border: none;
    border-bottom: 1px solid var(--border);
    padding: 12px 16px;
    text-align: left;
}

.feature-table th, .stdlib-table th {
    background: var(--jvav-dark);
    font-weight: 600;
    color: #fff;
}

.feature-table tr:nth-child(even),
.stdlib-table tr:nth-child(even) {
    background: var(--bg-gray);
}

.feature-table tr:hover,
.stdlib-table tr:hover {
    background: #E8F4FD;
}

.stdlib-table td:first-child {
    font-family: "JetBrains Mono", "Fira Code", monospace;
    white-space: nowrap;
    font-weight: 500;
    color: var(--jvav-mid);
}

/* Code block */
pre.code {
    background: #1E1E1E;
    border: none;
    border-radius: 8px;
    padding: 16px 20px;
    font-family: "JetBrains Mono", "Fira Code", "Courier New", monospace;
    font-size: 13px;
    overflow-x: auto;
    margin: 16px 0;
    line-height: 1.5;
    color: #D4D4D4;
    box-shadow: var(--card-shadow);
}

pre.code .kw { color: #569CD6; font-weight: bold; }
pre.code .fn { color: #DCDCAA; }
pre.code .str { color: #CE9178; }
pre.code .cm { color: #6A9955; }
pre.code .num { color: #B5CEA8; }
pre.code .type { color: #4EC9B0; }

/* Disclaimer */
.disclaimer {
    background: linear-gradient(135deg, #FFF9E6, #FFF3CD);
    border: 1px solid #F0E0A0;
    border-left: 4px solid var(--java-gold);
    padding: 14px 18px;
    font-size: 13px;
    color: #665;
    margin-bottom: 20px;
    border-radius: 0 8px 8px 0;
}

.disclaimer a {
    color: var(--jvav-light);
    text-decoration: underline;
    cursor: pointer;
}

/* Footer */
.footer {
    background: var(--jvav-dark);
    padding: 40px 24px;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.6);
}

.footer a {
    color: var(--java-gold);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: #fff;
    border-radius: 12px;
    max-width: 520px;
    width: 92%;
    padding: 28px;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 24px;
    color: #999;
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--text-dark);
}

.modal h3 {
    font-size: 20px;
    color: var(--jvav-dark);
    margin-bottom: 14px;
    font-weight: 700;
}

.modal p {
    font-size: 14px;
    color: var(--text-mid);
    line-height: 1.7;
    margin-bottom: 10px;
}

.modal-tag {
    display: inline-block;
    background: var(--bg-gray);
    border: 1px solid var(--border);
    padding: 3px 10px;
    font-size: 12px;
    color: var(--text-light);
    margin-right: 6px;
    border-radius: 4px;
}

/* Lang toggle */
[data-lang] { display: none; }
[data-lang].active { display: block; }
span[data-lang].active, a span[data-lang].active { display: inline; }
a[data-lang].active { display: inline; }
button[data-lang].active { display: inline-block; }

/* Breadcrumb */
.breadcrumb {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.breadcrumb a {
    color: var(--jvav-light);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Nav cards */
.nav-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin: 24px 0;
}

.nav-card {
    border: 1px solid var(--border);
    padding: 24px;
    background: #fff;
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: var(--card-shadow);
}

.nav-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--jvav-light);
}

.nav-card h4 {
    font-size: 16px;
    color: var(--jvav-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.nav-card p {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 12px;
    line-height: 1.6;
}

.nav-card a {
    font-size: 13px;
    font-weight: 600;
    color: var(--jvav-light);
}

/* Step box */
.step-box {
    background: #fff;
    border: 1px solid var(--border);
    padding: 16px 20px;
    margin: 12px 0;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    transition: all 0.2s;
}

.step-box:hover {
    border-color: var(--jvav-light);
    box-shadow: var(--card-shadow-hover);
}

.step-box h4 {
    font-size: 14px;
    color: var(--jvav-mid);
    margin-bottom: 8px;
    font-weight: 600;
}

.step-box pre {
    font-family: "JetBrains Mono", "Fira Code", monospace;
    font-size: 13px;
    margin: 0;
    background: none;
    border: none;
    padding: 0;
    color: var(--text-dark);
}

/* Feature grid (homepage) */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin: 32px 0;
}

.feature-item {
    padding: 28px;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    box-shadow: var(--card-shadow);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--jvav-light);
}

.feature-item .icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--jvav-light), var(--jvav-mid));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 16px;
    color: #fff;
}

.feature-item h3 {
    font-size: 18px;
    color: var(--jvav-dark);
    margin: 0 0 8px;
    font-weight: 700;
}

.feature-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
    margin: 0;
}

/* Section headers */
.section-header {
    text-align: center;
    padding: 48px 24px 24px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--jvav-dark);
    margin-bottom: 8px;
}

.section-header p {
    font-size: 16px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .main { flex-direction: column; }
    .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
    .hero h1 { font-size: 40px; }
    .hero-subtitle { font-size: 18px; }
    .nav-links { gap: 16px; }
    .nav-links a { font-size: 12px; }
    .header-inner { padding: 0 16px; }
    .content { padding: 20px; }
    .feature-grid { grid-template-columns: 1fr; }
}