/* Root Variables */
:root {
    --font-primary: Georgia, Cambria, "Times New Roman", Times, serif;
    --color-bg: #f0f4f8; /* Blue-gray */
    --color-primary: #222831; /* Charcoal */
    --color-accent: #00a120aa; /* Blue-green */
    --color-light: #f9f9f9; /* Off-white */
    --color-dark: #004f03; /* Deep teal */
    --color-gray: #adb5bd; /* Cool gray */
    --transition: 0.3s ease;
}

body {
    margin: 0;
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-primary);
    line-height: 1.6;
}

/* Reset lists */
ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Navigation */
.nav-header {
    position: fixed;
    top: 0;
    width: 100%;
    background: transparent;
    z-index: 999;
    transition: background var(--transition), box-shadow var(--transition);
}

.nav-header.scrolled {
    background: var(--color-light);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.nav-logo {
    font-size: 1.6em;
    font-weight: bold;
    margin: 0;
}

.nav-menu {
    display: flex;
    gap: 20px;
}

.nav-link {
    text-decoration: none;
    color: var(--color-primary);
    font-weight: normal;
    transition: color var(--transition);
}

.nav-link:hover {
    color: var(--color-accent);
}

/* Hero */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    position: relative;
    text-align: center;
    padding: 0 20px;
}

.hero-content {
    max-width: 600px;
}

.hero-pic {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-accent);
    margin-bottom: 20px;
}

.hero-title {
    font-size: 2.4em;
    font-weight: bold;
    margin: 0 0 15px;
    color: var(--color-dark);
}

.hero-subtitle {
    font-weight: normal;
    margin-bottom: 30px;
    font-size: 1.1em;
    color: var(--color-gray);
    font-style: italic;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}
.about .btn-primary {
    margin-top: 20px;
    display: inline-block;
    text-align: center;
}

.btn-primary,
.btn-secondary {
    text-decoration: none;
    display: inline-block;
    padding: 10px 20px;
    border-radius: 20px;
    transition: background var(--transition), color var(--transition);
    font-weight: bold;
    font-size: 0.95em;
    border: 1px solid var(--color-accent);
}

.btn-primary, .btn-secondary:hover {
    background: var(--color-accent);
    color: var(--color-light);
}

.btn-primary:hover {
    background: var(--color-dark);
    color: var(--color-light);
}

.btn-secondary {
    background: var(--color-light);
    color: var(--color-primary);
}

/* Sections */
.section {
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.section h2 {
    font-size: 2em;
    margin-bottom: 20px;
    color: var(--color-accent);
    font-weight: bold;
    position: relative;
}

/* Underline for headings */
.section h2::after {
    content: "";
    display: block;
    width: 50px;
    height: 2px;
    background: var(--color-accent);
    margin: 10px auto 0;
}

.section p {
    font-size: 1em;
    max-width: 700px;
    margin: 0 auto 40px;
    color: var(--color-primary);
}

/* Card Styles (Skills, Projects, etc.) */
.card {
    background: var(--color-light);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid #ddd;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
    text-align: left;
    padding: 20px;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.07);
}

.card h3 {
    margin: 0 0 10px;
    font-weight: bold;
    font-size: 1.1em;
    color: var(--color-primary);
}

.card p {
    font-size: 0.95em;
    color: var(--color-primary);
}

.card a {
    margin-top: 15px;
    text-decoration: none;
    color: var(--color-accent);
    font-weight: bold;
    font-size: 0.95em;
}

/* Grid Layouts */
.skills-categories,
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    justify-content: center;
    padding: 10px;
    margin: 0 auto;
    box-sizing: border-box;
}

@media (max-width: 600px) {
    .skills-categories,
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

/* Contact */
.contact .btn-primary {
    margin-top: 20px;
}

/* Footer */
.footer {
    background: var(--color-primary);
    color: var(--color-light);
    padding: 20px;
    text-align: center;
    font-size: 0.9em;
}

/* Fade-in Animations */
.section,
.projects-grid,
.skills-grid {
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition) 0.2s;
}

.section.appear,
.projects-grid.appear,
.skills-grid.appear {
    opacity: 1;
    transform: translateY(0);
}