:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #ec4899;
    --bg-dark: #0f172a;
    --text-light: #f8fafc;
    --text-dim: #94a3b8;
    --card-bg: #1e293b;
    --gradient: linear-gradient(135deg, #4f46e5 0%, #ec4899 100%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    background: 
        radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.15) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.15) 0%, transparent 20%);
}

.logo {
    width: 6rem;
    height: 6rem;
    margin-bottom: 2rem;
    filter: drop-shadow(0 0 20px rgba(79, 70, 229, 0.5));
    animation: float 6s ease-in-out infinite;
}

h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-dim);
    max-width: 600px;
    margin-bottom: 3rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 9999px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.1rem;
}

.btn-primary {
    background: white;
    color: var(--primary);
    box-shadow: 0 10px 30px -10px rgba(79, 70, 229, 0.5);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px -10px rgba(79, 70, 229, 0.6);
}

/* Features Grid */
.features {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(255,255,255,0.05);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(79, 70, 229, 0.3);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
}

.card p {
    color: var(--text-dim);
}

/* Installation & Usage */
.section {
    padding: 6rem 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
}

.steps {
    display: grid;
    gap: 1.5rem;
}

.step {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.step-number {
    background: var(--gradient);
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Excel Preview */
.excel-preview {
    width: 100%;
    overflow-x: auto;
    border-radius: 1rem;
    margin-top: 2rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    color: #1e293b;
    border-radius: 0.5rem;
    overflow: hidden;
    font-size: 0.9rem;
}

th, td {
    padding: 1rem;
    border: 1px solid #e2e8f0;
    text-align: left;
}

th {
    background: #f8fafc;
    font-weight: 600;
}

td:first-child {
    font-weight: 500;
    color: #0f172a;
}