:root {
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #eef2ff;
    --accent: #0ea5e9;
    --accent-light: #f0f9ff;
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --bg-main: #ffffff;
    --bg-alt: #f8fafc;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-main);
    color: var(--slate-700);
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    color: var(--slate-900);
    font-weight: 700;
}

.navbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--slate-100);
    padding: 1rem 0;
    z-index: 1000;
}

.nav-link {
    color: var(--slate-600) !important;
    font-weight: 600;
    margin: 0 0.5rem;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary) !important;
}

.hero-section {
    padding: 160px 0 100px;
    background: radial-gradient(circle at top right, var(--primary-light), transparent 50%),
                radial-gradient(circle at bottom left, var(--accent-light), transparent 50%);
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.profile-img {
    width: 100%;
    max-width: 440px;
    border-radius: 1.5rem;
    box-shadow: var(--shadow);
}

.section-padding {
    padding: 100px 0;
}

.bg-section-alt {
    background-color: var(--bg-alt);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    text-align: center;
}

.grid-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1.5rem;
    border: 1px solid var(--slate-100);
    height: 100%;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.grid-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}

.skill-card-modern {
    background: linear-gradient(145deg, #ffffff, var(--slate-50));
    padding: 2rem;
    border-radius: 1.25rem;
    border: 1px solid var(--slate-200);
    position: relative;
    overflow: hidden;
    height: 100%;
}

.skill-card-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: white;
    border-radius: 0.75rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--slate-100);
    transition: var(--transition);
}

.skill-item:hover {
    border-color: var(--primary);
    padding-left: 1rem;
}

.btn-custom {
    padding: 0.8rem 2.2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white !important;
}

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

.btn-outline {
    border: 2px solid var(--slate-200);
    color: var(--slate-800) !important;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary) !important;
}

.cert-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    border-left: 5px solid var(--primary);
    box-shadow: var(--shadow);
    height: 100%;
    transition: var(--transition);
}

.cert-card:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.footer {
    background: var(--slate-900);
    color: white;
    padding: 60px 0;
}

@media (max-width: 767px) {
    .hero-section { text-align: center; }
    .hero-content h1 { font-size: 2.5rem; }
    .profile-img { margin-top: 3rem; }
}

html {
    scroll-behavior: smooth;
}