:root {
    --font-display: 'Clash Display', sans-serif;
    --font-body: 'Inter', sans-serif;
    --radius-xl: 36px;
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-pill: 999px;
    --container: 1240px;
    --header-height: 82px;
    --transition: 220ms ease;
}

:root[data-theme="light"] {
    color-scheme: light;
    --bg: #f5f7fc;
    --bg-soft: #ecf0f8;
    --text: #131422;
    --text-muted: #4d4e62;
    --accent: #7b3fe0;
    --accent-soft: #b88af6;
    --accent-strong: #5a2ca0;
    --line: rgba(123, 63, 224, 0.22);
    --glass: rgba(255, 255, 255, 0.78);
    --glass-strong: rgba(255, 255, 255, 0.92);
    --shadow: 0 24px 40px -24px rgba(27, 25, 48, 0.35);
    --particle-dot: rgba(123, 63, 224, 0.85);
    --particle-line: rgba(123, 63, 224, 0.45);
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0c0c11;
    --bg-soft: #151522;
    --text: #f3f1fb;
    --text-muted: #b6b2cb;
    --accent: #b066fe;
    --accent-soft: #cba6ff;
    --accent-strong: #8b3ef6;
    --line: rgba(176, 102, 254, 0.24);
    --glass: rgba(20, 18, 30, 0.78);
    --glass-strong: rgba(24, 20, 34, 0.9);
    --shadow: 0 28px 48px -24px rgba(0, 0, 0, 0.7);
    --particle-dot: rgba(192, 143, 255, 0.48);
    --particle-line: rgba(192, 143, 255, 0.22);
}

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

html,
body {
    min-height: 100%;
}

body {
    font-family: var(--font-body);
    color: var(--text);
    background:
        radial-gradient(70% 65% at 90% 12%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 60%),
        radial-gradient(60% 55% at 8% 22%, color-mix(in srgb, var(--accent-soft) 13%, transparent), transparent 62%),
        linear-gradient(180deg, var(--bg), var(--bg-soft));
    line-height: 1.55;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

a {
    color: inherit;
}

#particles-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.noise {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.24;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.78' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.05'/%3E%3C/svg%3E");
}

.site-wrapper {
    position: relative;
    z-index: 3;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: min(100% - 40px, var(--container));
    margin-inline: auto;
}

.header {
    position: fixed;
    inset: 12px 0 auto;
    z-index: 30;
    transition: transform 350ms cubic-bezier(0.33, 1, 0.68, 1);
}

.header.is-hidden {
    transform: translateY(-130%);
}

.header-shell {
    min-height: var(--header-height);
    padding: 10px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    background: transparent;
    transition: all 400ms ease;
}

.header-shell.is-scrolled {
    border-color: var(--line);
    background: color-mix(in srgb, var(--glass) 94%, transparent);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
}

.brand i {
    font-size: 1.7rem;
    color: var(--accent-soft);
    text-shadow: 0 0 12px color-mix(in srgb, var(--accent) 45%, transparent);
}

.brand span {
    font-size: clamp(1.12rem, 1.35vw, 1.48rem);
    background: linear-gradient(125deg, var(--text), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.45rem;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    padding: 8px 18px;
    border-radius: var(--radius-pill);
    transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.is-active {
    color: var(--text);
    background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.icon-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--glass) 75%, transparent);
    color: var(--text);
    display: inline-grid;
    place-items: center;
    cursor: pointer;
    transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.icon-btn:hover {
    transform: translateY(-1px);
    border-color: color-mix(in srgb, var(--accent) 60%, var(--line));
}

.theme-toggle i {
    font-size: 0.98rem;
}

.mobile-toggle {
    display: none;
}

.page-main {
    padding-top: calc(var(--header-height) + 4px);
    flex: 1;
}

.page-main > section:first-child {
    padding-top: clamp(20px, 3vw, 40px);
}

section {
    padding: clamp(44px, 6vw, 80px) 0;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    padding: 8px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--accent-soft);
    background: color-mix(in srgb, var(--glass-strong) 75%, transparent);
}

.btn {
    border: none;
    border-radius: var(--radius-pill);
    padding: 0.92rem 1.55rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.btn-primary {
    color: white;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    box-shadow: 0 12px 24px -14px color-mix(in srgb, var(--accent) 72%, transparent);
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-ghost {
    border: 1px solid var(--line);
    color: var(--text);
    background: color-mix(in srgb, var(--glass-strong) 65%, transparent);
}

.btn-ghost:hover {
    border-color: color-mix(in srgb, var(--accent) 65%, var(--line));
}

.card {
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    background: color-mix(in srgb, var(--glass-strong) 88%, transparent);
    box-shadow: var(--shadow);
}

.page-footer {
    margin-top: 34px;
    border-top: 1px solid var(--line);
    padding: 28px 0 30px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.page-footer p {
    text-align: center;
}

[data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 500ms ease, transform 500ms ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 940px) {
    .mobile-toggle {
        display: inline-grid;
    }

    .nav-menu {
        position: absolute;
        right: 20px;
        top: calc(100% + 10px);
        width: min(280px, calc(100vw - 40px));
        border-radius: 22px;
        border: 1px solid var(--line);
        background: color-mix(in srgb, var(--glass-strong) 90%, transparent);
        box-shadow: var(--shadow);
        padding: 14px;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        opacity: 0;
        pointer-events: none;
        transform: translateY(-8px);
        transition: opacity var(--transition), transform var(--transition);
    }

    .nav-menu.is-open {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .nav-link {
        display: block;
        padding: 10px 14px;
        border-radius: 12px;
    }

    .nav-link:hover,
    .nav-link.is-active {
        background: color-mix(in srgb, var(--accent) 15%, transparent);
    }
}

@media (max-width: 640px) {
    .container {
        width: min(100% - 24px, var(--container));
    }

    .header-shell {
        padding: 8px 12px;
    }

    .brand span {
        font-size: 1.05rem;
    }

    .page-main {
        padding-top: calc(var(--header-height) + 24px);
    }
}