:root {
    --primary: #4f46e5; /* Indigo Modern */
    --primary-soft: rgba(79, 70, 229, 0.1);
    --secondary: #0ea5e9; /* Sky Blue */
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #475569;
    --glass: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --font-serif: 'Outfit', sans-serif;
    --font-sans: 'Inter', sans-serif;
    --shadow-soft: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-premium: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

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

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

/* Typography Hierarchy */
h1, h2, h3, .font-serif { font-family: var(--font-serif); }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Glassmorphism */
header {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.3s;
}
.nav-links a:hover { color: var(--primary); }

/* Reading Progress Bar */
.reading-progress {
    position: fixed;
    top: 0; left: 0; width: 0%; height: 4px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    z-index: 2000;
}

/* Hero Section - Authority */
.hero {
    padding: 100px 0;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
    gap: 4rem;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-soft);
    color: var(--primary);
    border-radius: 99px;
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    font-weight: 900;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero h1 em {
    font-style: italic;
    color: var(--primary);
}

.hero-sub {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    border-radius: 32px;
    box-shadow: var(--shadow-premium);
}

/* Cards & Grids */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.card {
    background: var(--bg-alt);
    padding: 2.5rem;
    border-radius: 24px;
    transition: all 0.4s ease;
    border: 1px solid transparent;
}

.card:hover {
    transform: translateY(-8px);
    background: white;
    border-color: var(--primary-soft);
    box-shadow: var(--shadow-premium);
}

.card-icon {
    width: 56px; height: 56px;
    background: var(--primary-soft);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

/* CTAs */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover { transform: scale(1.02); background: var(--primary-hover); }

/* Floating WhatsApp with Pulse */
.floating-wa {
    position: fixed;
    bottom: 2rem; right: 2rem;
    width: 64px; height: 64px;
    background: #25d366;
    color: white;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 2rem;
    box-shadow: 0 10px 25px rgba(37, 211, 102, 0.4);
    z-index: 1000;
    animation: wa-pulse 2s infinite;
    text-decoration: none;
}

@keyframes wa-pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
    70% { transform: scale(1.05); box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

/* Authority Bio Section */
.author-bio {
    background: var(--bg-alt);
    padding: 4rem;
    border-radius: 32px;
    display: flex;
    gap: 3rem;
    align-items: center;
    margin: 80px 0;
}

.author-img {
    width: 150px; height: 150px;
    border-radius: 50%;
    object-fit: cover;
}

/* Animations */
.fade-in { animation: fadeIn 0.8s ease-out; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 1024px) {
    .hero { grid-template-columns: 1fr; text-align: center; }
    .hero-sub { margin-left: auto; margin-right: auto; }
    .hero h1 { font-size: 3rem; }
    .author-bio { flex-direction: column; text-align: center; }
}