:root {
    --bg: #0b0d12;
    --panel: #111623;
    --panel-strong: #0c101b;
    --border: #1b2233;
    --accent: #2f7dff;
    --accent-2: #5fc8ff;
    --text: #e8edf7;
    --text-strong: #ffffff;
    --muted: #97a3b9;
    --shadow: rgba(0, 0, 0, 0.35);
    --icon-filter: invert(85%) saturate(0%) brightness(105%);
}

.theme-light {
    --bg: #f8fafc;
    --panel: #ffffff;
    --panel-strong: #eef2f8;
    --border: #d7deea;
    --accent: #2f7dff;
    --accent-2: #5fc8ff;
    --text: #0f172a;
    --text-strong: #0b1220;
    --muted: #5b6478;
    --shadow: rgba(15, 23, 42, 0.12);
    --icon-filter: invert(18%) sepia(9%) saturate(566%) hue-rotate(181deg) brightness(92%) contrast(88%);
}

* {
    box-sizing: border-box;
    font-family: "Poppins", "Segoe UI", system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg);
    color: var(--text);
}

a {
    color: inherit;
}

main {
    flex: 1;
    padding: 0 1.25rem;
}

.center {
    text-align: center;
    margin: 0.5rem 0;
}

header.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 0.9rem 1.6rem;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 10px 28px var(--shadow);
    backdrop-filter: blur(8px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: var(--text);
    text-transform: uppercase;
}

.brand img {
    width: 150px;
    height: auto;
    display: block;
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.22));
}

.brand span {
    display: none;
}

.main-nav {
    flex: 1;
}

.main-nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.2rem;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.55rem 0.85rem;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-strong);
    box-shadow: 0 8px 18px var(--shadow);
}

.theme-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.35rem 0.75rem 0.35rem 0.55rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--panel-strong);
    color: var(--text);
    cursor: pointer;
    transition: box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.theme-toggle:hover {
    box-shadow: 0 10px 24px var(--shadow);
    border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}

.theme-toggle .track {
    width: 44px;
    height: 24px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--panel);
    display: inline-flex;
    align-items: center;
    padding: 2px;
}

.theme-toggle .thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    transform: translateX(0);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.25);
}

.theme-toggle[data-theme="light"] .thumb {
    transform: translateX(18px);
    background: linear-gradient(135deg, #ffffff, #dfe8ff);
    box-shadow: 0 6px 12px rgba(15, 23, 42, 0.18);
}

.theme-label {
    font-weight: 700;
    letter-spacing: 0.01em;
}

.auth-link {
    display: flex;
    gap: 0.6rem;
    margin-left: auto;
}

.auth-link a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.15rem;
    border-radius: 999px;
    border: 1px solid transparent;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.01em;
    transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 10px 20px rgba(47, 125, 255, 0.35);
}

.auth-link a:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 28px rgba(47, 125, 255, 0.45);
}

.auth-link a.secondary {
    background: rgba(255, 255, 255, 0.04);
    border-color: #25324a;
    color: var(--text);
    box-shadow: none;
}

.theme-light .auth-link a.secondary {
    border-color: #d7deea;
    background: #eef2f8;
}

.auth-link a.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #33425e;
}

.theme-light .auth-link a.secondary:hover {
    background: #e2e8f0;
    border-color: #c8d4e7;
}

.section {
    max-width: 1080px;
    margin: 2.5rem auto;
    padding: 1.75rem;
    min-height: 50vh;
    scroll-margin-top: 90px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 22px 38px var(--shadow);
}

.theme-dark .section {
    border-color: #f6e39b;
}

.section h2 {
    margin-top: 0;
    color: var(--text-strong);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}

.section p {
    margin-bottom: 0;
    line-height: 1.6;
    color: var(--muted);
}

.hero {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    text-align: center;
    background: var(--panel-strong);
    border: none;
    box-shadow: none;
}

.ip-box {
    display: inline-block;
    margin-top: 1.25rem;
    padding: 1.2rem 2.6rem;
    border-radius: 14px;
    background: var(--panel-strong);
    color: var(--text-strong);
    font-size: 1.9rem;
    letter-spacing: 0.12em;
    border: 1px solid var(--border);
    box-shadow: 0 14px 28px var(--shadow);
}

.theme-light .ip-box {
    background: #f1f5fb;
    border-color: #d7deea;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.12);
}

.port {
    margin-top: 0.6rem;
    color: var(--muted);
    font-size: 1.05rem;
    letter-spacing: 0.08em;
}

.mega-footer {
    margin-top: 2rem;
    padding: 2rem 1.5rem 1.2rem;
    background: var(--panel);
    border-top: 1px solid var(--border);
    box-shadow: 0 -12px 28px var(--shadow);
}

.mega-footer .footer-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.mega-footer .footer-brand {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mega-footer .footer-brand img {
    width: 160px;
    height: auto;
    display: block;
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.22));
}

.mega-footer .footer-brand p {
    margin: 0;
    color: var(--muted);
    line-height: 1.5;
}

.footer-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem 1.25rem;
}

.footer-col h4 {
    margin: 0 0 0.5rem;
    color: var(--text-strong);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-size: 0.95rem;
}

.footer-col a {
    display: block;
    color: var(--muted);
    text-decoration: none;
    margin: 0.35rem 0;
    font-weight: 600;
    transition: color 0.15s ease;
}

.footer-col a:hover {
    color: var(--text-strong);
}

.footer-social {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    justify-content: flex-start;
    margin: 1.2rem 0 0.8rem;
}

.footer-social .icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--panel-strong);
    transition: transform 0.15s ease, box-shadow 0.2s ease, opacity 0.15s ease;
}

.footer-social .icon-btn img {
    width: 24px;
    height: 24px;
    filter: var(--icon-filter);
}

.footer-social .icon-btn:hover {
    transform: translateY(-2px);
    opacity: 1;
    box-shadow: 0 12px 26px var(--shadow);
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.8rem;
    color: var(--muted);
    font-size: 0.95rem;
}

.footer-bottom .footer-links {
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
}

.footer-bottom .footer-links a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 600;
}

.footer-bottom .footer-links a:hover {
    color: var(--text-strong);
}

.theme-dark .mega-footer,
.theme-dark .footer-social .icon-btn,
.theme-dark .footer-bottom {
    border-color: #f6e39b;
}

.theme-dark .footer-top {
    border-bottom-color: #f6e39b;
}

.theme-dark .footer-bottom .footer-links a {
    color: #e8edf7;
}

.theme-dark .footer-bottom .footer-links a:hover {
    color: #ffffff;
}

@media (max-width: 960px) {
    header.topbar {
        flex-wrap: wrap;
        gap: 0.9rem;
        padding: 0.9rem 1.1rem;
    }

    .main-nav {
        width: 100%;
    }

    .main-nav ul {
        justify-content: flex-start;
    }

    .auth-link {
        width: 100%;
        justify-content: flex-end;
    }
}

@media (max-width: 680px) {
    .brand img {
        width: 130px;
    }

    .main-nav ul {
        justify-content: center;
    }

    .auth-link {
        justify-content: center;
    }

    main {
        padding: 0 0.9rem;
    }

    .ip-box {
        font-size: 1.5rem;
        padding: 1rem 1.8rem;
    }
}
.footer-rail {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem 1rem;
    margin: 1.5rem auto 0.25rem;
    padding: 0.9rem 1.15rem;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: 0 10px 22px var(--shadow);
    max-width: 900px;
}

.footer-rail .rail-group {
    display: flex;
    gap: 0.65rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-rail .icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--panel-strong);
    transition: transform 0.15s ease, box-shadow 0.2s ease, opacity 0.15s ease;
}

.footer-rail .icon-btn img {
    width: 24px;
    height: 24px;
    filter: var(--icon-filter);
}

.footer-rail .icon-btn:hover {
    transform: translateY(-2px);
    opacity: 1;
    box-shadow: 0 12px 26px var(--shadow);
}

.footer-rail .icon-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.footer-rail .rail-links {
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
    justify-content: center;
    font-weight: 600;
}

.footer-rail .rail-links a {
    color: var(--text);
    text-decoration: none;
    padding: 0.35rem 0.65rem;
    border-radius: 10px;
    transition: background 0.15s ease, color 0.15s ease;
}

.footer-rail .rail-links a:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-strong);
}