:root {
    --nav-height: 64px;
    --accent: #e67e22;
    --accent-dark: #d35400;
    --text: #1e272e;
    --text-muted: #3d4f5f;
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-border: rgba(255, 255, 255, 0.7);
    --shadow-sm: 0 8px 20px rgba(0,0,0,0.05);
    --shadow-md: 0 12px 28px rgba(0,0,0,0.08);
    --radius: 20px;
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
    background: linear-gradient(160deg, #fdf3e4 0%, #fce8d0 30%, #fad4a5 70%, #f7c994 100%);
    background-attachment: fixed;
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    -webkit-font-smoothing: antialiased;
    padding-top: calc(var(--nav-height) + 2rem);
    padding-bottom: 2rem;
    overflow-x: hidden;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 8px rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.7);
}

.nav-logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-dark);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.4rem 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover {
    color: var(--accent-dark);
    border-bottom-color: var(--accent-dark);
}

.dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 14px;
    padding: 0.5rem 0;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    list-style: none;
    min-width: 170px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.2s ease;
    border: 1px solid rgba(255,255,255,0.7);
}

.dropdown:hover .dropdown-menu,
.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}

.dropdown-menu li a {
    display: block;
    padding: 0.5rem 1.2rem;
    color: var(--text);
    font-size: 0.9rem;
    border-bottom: none !important;
    white-space: nowrap;
}

.dropdown-menu li a:hover {
    background: rgba(0,0,0,0.04);
    color: var(--accent-dark);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(255,255,255,0.9);
        backdrop-filter: blur(20px);
        padding: 1rem 2rem;
        box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        gap: 1rem;
        align-items: flex-start;
    }

    .nav-links.active { display: flex; }
    .nav-toggle { display: block; }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        background: transparent;
        opacity: 1;
        visibility: visible;
        transform: none;
        padding-left: 1rem;
    }

    .dropdown .dropdown-menu {
        display: none;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }
}

.container {
    max-width: 880px;
    width: 100%;
    margin: 0 auto;
    padding: 0 1.5rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header .badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    color: #fff;
    padding: 0.3rem 1.2rem;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    box-shadow: 0 4px 10px rgba(211, 84, 0, 0.25);
}

header h1 {
    font-size: 2.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, #b85c1a, var(--accent-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.8px;
    margin-bottom: 0.5rem;
}

header .subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 400;
}

section {
    margin-bottom: 3rem;
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: var(--text);
    border-left: 4px solid var(--accent-dark);
    padding-left: 1rem;
}

.grid-2, .grid-3, .grid-4 {
    display: grid;
    gap: 1.2rem;
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--card-border);
    transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.card a {
    color: var(--accent-dark);
    text-decoration: none;
    font-weight: 500;
    word-break: break-word;
    display: block;
    margin-bottom: 0.3rem;
    transition: color 0.2s;
}

.card a:hover {
    color: #a04000;
    text-decoration: underline;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.feature-card, .download-card {
    text-align: center;
    padding: 2rem 1.5rem;
}

.feature-card h3, .download-card h3 {
    margin: 0.5rem 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.icon-big {
    font-size: 2.8rem;
    margin-bottom: 0.4rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    margin: 0.4rem 0.3rem;
    transition: all 0.2s ease;
    font-size: 0.95rem;
    cursor: pointer;
    outline: none;
}

.btn-primary {
    color: var(--accent-dark);
    border: 2px solid var(--accent-dark);
    background: transparent;
    box-shadow: none;
}

.btn-primary:hover {
    background: rgba(211, 84, 0, 0.08);
    border-color: #b85c1a;
    color: #b85c1a;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(211, 84, 0, 0.15);
}

.btn-primary:active {
    background: rgba(211, 84, 0, 0.15);
    border-color: #a04000;
    color: #a04000;
    transform: translateY(1px) scale(0.97);
    box-shadow: none;
    transition: all 0.05s;
}

.btn-outline {
    color: var(--accent-dark);
    border: 2px solid var(--accent-dark);
    background: transparent;
}

.btn-outline:hover {
    background: rgba(211, 84, 0, 0.08);
    border-color: #b85c1a;
    color: #b85c1a;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(211, 84, 0, 0.15);
}

.btn-outline:active {
    background: rgba(211, 84, 0, 0.15);
    border-color: #a04000;
    color: #a04000;
    transform: translateY(1px) scale(0.97);
    box-shadow: none;
    transition: all 0.05s;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--card-border);
    -webkit-overflow-scrolling: touch;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    white-space: normal;
}

th, td {
    padding: 1rem 1.2rem;
    text-align: left;
    border-bottom: 1px solid rgba(0,0,0,0.06);
}

th {
    background: rgba(0,0,0,0.02);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
}

tr:last-child td { border-bottom: none; }

code {
    background: rgba(0,0,0,0.05);
    padding: 0.2em 0.6em;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-dark);
    font-size: 0.9em;
    word-break: break-all;
}

pre {
    background: #2d3436;
    color: #dfe6e9;
    padding: 1.2rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1rem 0;
    white-space: pre-wrap;
    word-break: break-all;
}

pre code {
    background: none;
    color: inherit;
    white-space: pre-wrap;
    word-break: break-all;
}

.footer {
    text-align: center;
    color: var(--text-muted);
    margin-top: 4rem;
    padding: 2rem 0;
    border-top: 1px solid rgba(0,0,0,0.08);
    font-size: 0.9rem;
}

@media (max-width: 640px) {
    header h1 { font-size: 2rem; }
    .btn { padding: 0.6rem 1.5rem; }
    .container { padding: 0 1rem; }
}

.footer-links {
    text-align: center;
    margin-bottom: 0.5rem;
}
.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 1rem;
    font-weight: 500;
}
.footer-links a:hover {
    color: var(--accent-dark);
}