:root {
    /* Common */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 12px;
    --max-width: 1200px;

    /* Light Theme */
    --bg-color: #f8faff;
    --surface-color: #ffffff;
    --text-primary: #1a1c2e;
    --text-secondary: #5e6278;
    --accent-color: #6366f1;
    --accent-soft: #eef2ff;
    --border-color: #e4e6ef;
    --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
}

[data-theme='dark'] {
    --bg-color: #0b0c14;
    --surface-color: #161826;
    --text-primary: #f0f1f5;
    --text-secondary: #a1a5b7;
    --accent-color: #818cf8;
    --accent-soft: #1e1b4b;
    --border-color: #2b2d41;
    --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.3);
    --glass-bg: rgba(22, 24, 38, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.25rem 0;
    transition: all var(--transition-normal);
}

header.scrolled {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0.75rem 0;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo img {
    height: 40px;
    width: auto;
}

.theme-toggle {
    background: var(--accent-soft);
    border: none;
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--accent-color);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: scale(1.05);
    background: var(--accent-color);
    color: white;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 540px;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual .logo-tree {
    width: 100%;
    max-width: 450px;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.1));
    animation: float 6s ease-in-out infinite;
}

.hero-visual .beyni-badge {
    position: absolute;
    bottom: -20px;
    right: 0;
    width: 180px;
    transform: rotate(10deg);
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.1));
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2rem;
    border-radius: var(--border-radius-md);
    font-weight: 700;
    text-decoration: none;
    transition: all var(--transition-fast);
    gap: 0.75rem;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 10px 20px -5px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -10px rgba(99, 102, 241, 0.5);
}

section {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.grid-5 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--accent-color);
}

.card h3 {
    font-size: 1.25rem;
    color: var(--accent-color);
}

.footer {
    padding: 4rem 0;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-text p {
        margin: 0 auto 2.5rem;
    }

    .hero-visual .beyni-badge {
        width: 120px;
    }
}