/* ==========================================================================
   Base Styles & Variables (Strictly No Gradients, Solid Premium Aesthetic)
   ========================================================================== */
   :root {
    /* Color Palette - Minimalist & Solid */
    --bg-primary: #F9F9F8; /* Warm off-white */
    --bg-accent: #EFEFEF;  /* Subtle solid grey for distinction */
    --bg-dark: #121212;    /* Deep charcoal, not absolute black */
    --bg-card: #FFFFFF;    /* Pure solid white for cards */
    
    --text-primary: #1A1A1A;
    --text-secondary: #555555;
    --text-light: #F9F9F8;
    --text-light-muted: #A0A0A0;
    
    --accent-color: #2D5AF7; /* Solid striking blue - very engineered and clean */
    
    /* Typography */
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Manrope', system-ui, -apple-system, sans-serif;
    
    /* Layout */
    --container-width: 1200px;
    --section-spacing: 6vh;
    --radius-sm: 4px;
    --radius-md: 8px;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Elements */
h1, h2, h3, h4, .logo {
    font-family: var(--font-heading);
    line-height: 1.1;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

h1 { font-size: clamp(3rem, 8vw, 6rem); font-weight: 800; }
h2 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 600; margin-bottom: 2rem; }
h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 0.5rem; }
h4 { font-size: 1.125rem; font-weight: 600; }

p { margin-bottom: 1rem; color: var(--text-secondary); }
.large-text { font-size: clamp(1.25rem, 2vw, 1.75rem); line-height: 1.5; font-weight: 400; color: var(--text-primary); }
.text-light { color: var(--text-light) !important; }
.text-light-muted { color: var(--text-light-muted) !important; }

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.section {
    padding: var(--section-spacing) 0;
    min-height: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.bg-accent { background-color: var(--bg-accent); }
.bg-dark { background-color: var(--bg-dark); color: var(--text-light); }
.align-center { text-align: center; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: #1a40c9; /* darker solid shade */
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    box-shadow: inset 0 0 0 1.5px var(--text-primary);
}

.btn-outline:hover {
    background-color: var(--text-primary);
    color: white;
    transform: translateY(-2px);
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 1.5rem 0;
    background-color: rgba(249, 249, 248, 0.95);
    backdrop-filter: blur(8px);
    transition: transform var(--transition-fast), padding var(--transition-fast);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-fast);
}

.nav-links a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    padding-top: calc(var(--section-spacing) + 80px); /* Account for navbar */
    align-items: flex-start;
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.hero-description {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 2rem 0;
}

.hero-contact {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    font-weight: 500;
}

.social-links a:hover {
    color: var(--accent-color);
}

/* ==========================================================================
   About Section
   ========================================================================== */
.layout-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .layout-grid {
        grid-template-columns: 1fr 2fr;
    }
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.skill-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(0,0,0,0.05);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.04);
}

.skill-card p {
    margin-bottom: 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.project-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    margin-top: 2rem;
}

.project-item {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 2rem;
}

.project-item:first-child {
    border-top: none;
    padding-top: 0;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.project-meta h3 {
    margin: 0;
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--text-light);
}

.project-date {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-color);
}

.styled-list {
    list-style: none;
    padding-left: 0;
}

.styled-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.styled-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6rem;
    width: 6px;
    height: 6px;
    background-color: var(--accent-color);
    border-radius: 50%;
}

/* ==========================================================================
   Experience / Achievements
   ========================================================================== */
.timeline {
    border-left: 2px solid var(--bg-accent);
    padding-left: 2rem;
    margin-top: 1.5rem;
}

.timeline-item {
    position: relative;
    padding-bottom: 3rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.35rem; /* calc(-2rem - 1px - 4px) roughly */
    top: 0;
    width: 12px;
    height: 12px;
    background-color: var(--bg-primary);
    border: 2px solid var(--text-primary);
    border-radius: 50%;
}

.timeline-date {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.timeline-item h4 {
    margin-bottom: 0.25rem;
}

.timeline-item p {
    margin: 0;
    font-size: 0.95rem;
}

.achievement-card {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 2.5rem;
    border-radius: var(--radius-sm);
    margin-top: 1.5rem;
}

.achievement-card .styled-list {
    color: var(--text-light-muted);
}

.achievement-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.achievement-header h3 {
    margin: 0;
    color: var(--text-light);
}

.badge {
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background-color: var(--bg-primary);
    padding: 3rem 0;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-title {
    font-size: clamp(2rem, 5vw, 4rem);
    margin-bottom: 2rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    font-size: 1.25rem;
    font-weight: 500;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a:hover {
    color: var(--accent-color);
}

.copyright {
    font-size: 0.875rem;
    color: var(--text-light-muted);
}

/* ==========================================================================
   Animations
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-smooth);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --section-spacing: 4vh;
    }
    
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-contact {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .project-meta {
        flex-direction: column;
        gap: 0.25rem;
    }

    .achievement-card {
        padding: 1.5rem;
    }
}