/* --- CSS Variables --- */
:root {
    /* Slate Palette */
    --slate-950: #020617;
    --slate-900: #0f172a;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-300: #cbd5e1;
    --slate-200: #e2e8f0;

    /* Accent Colors */
    --indigo-600: #4f46e5;
    --rose-600: #e11d48;
    --emerald-600: #059669;
    --amber-500: #f59e0b;

    /* Semantic Colors */
    --bg-dark: var(--slate-950);
    --bg-medium: var(--slate-900);
    --bg-light: var(--slate-800);
    --text-light: var(--slate-200);
    --text-medium: var(--slate-300);
    --border-color: var(--slate-700);
    --accent-primary: var(--indigo-600);
    --accent-secondary: var(--rose-600);
    --accent-success: var(--emerald-600);
    --accent-warning: var(--amber-500);

    /* Fonts */
    --font-title: 'Exo 2', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xxs: 0.25rem; /* 4px */
    --spacing-xs: 0.5rem;  /* 8px */
    --spacing-sm: 1rem;    /* 16px */
    --spacing-md: 1.5rem;  /* 24px */
    --spacing-lg: 2.5rem;  /* 40px */
    --spacing-xl: 4rem;    /* 64px */
    --spacing-xxl: 6rem;   /* 96px */

    /* Borders */
    --border-radius: 6px;
    --border-width: 1px;

    /* Animation */
    --animation-duration: 0.6s;
    --animation-timing: ease-out;
    --animation-delay: 0s; /* Default delay */
}

/* --- Global Resets & Base Styles --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark); /* Default body background */
    color: var(--text-medium);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden; /* Prevent horizontal scroll caused by animations */
}

/* --- Container --- */
.container {
    max-width: 1140px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
}

/* --- Typography --- */
h1, h2, h3 {
    font-family: var(--font-title);
    font-weight: 700;
    color: var(--text-light);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}
h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4rem); }
h2 { font-size: clamp(2rem, 4vw + 1rem, 3rem); text-align: center; margin-bottom: var(--spacing-lg); }
h3 { font-size: clamp(1.25rem, 2vw + 0.5rem, 1.75rem); color: var(--text-light); margin-bottom: var(--spacing-sm); }
p { margin-bottom: var(--spacing-sm); }
a { color: var(--accent-primary); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--text-light); }
ul { list-style: none; padding-left: 0; }

/* --- Header & Navigation --- */
.site-header {
    background-color: rgba(15, 23, 42, 0.8); /* slate-900 with transparency */
    border-bottom: var(--border-width) solid var(--border-color);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.header-container { display: flex; justify-content: space-between; align-items: center; }
.logo a { font-family: var(--font-title); font-weight: 700; font-size: 1.5rem; color: var(--text-light); text-decoration: none; }
.main-nav ul {
    display: flex;
    gap: var(--spacing-md);
}

.main-nav a {
    color: var(--text-medium);
    font-weight: 500;
    /* Removed horizontal padding, adjust vertical padding if needed for alignment */
    padding: var(--spacing-xs) 0;
    position: relative; /* Necessary for the ::after pseudo-element */
    text-decoration: none; /* Ensure default underline is off */
    /* REMOVED overflow: hidden; */
}

.main-nav a::after {
    content: '';
    position: absolute;
    width: 100%; /* Underline covers the full width */
    height: 2px; /* Thickness of the underline */
    background-color: var(--accent-primary); /* Underline color */
    bottom: 0; /* Position at the bottom edge - adjust slightly if needed e.g., bottom: -1px; */
    left: 0; /* Start position */
    transform: scaleX(0); /* Initially hidden (collapsed horizontally) */
    transform-origin: left; /* Scale expands from the left */
    transition: transform 0.3s ease-out; /* Animate the transform property */
}

.main-nav a:hover {
    color: var(--text-light); /* Keep hover text color change */
}

.main-nav a:hover::after {
    transform: scaleX(1); /* Expand underline to full width on hover */
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 1rem;
    padding: 0.75em 1.75em;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
    border: var(--border-width) solid transparent;
    position: relative; /* Needed for potential pseudo-elements or animations */
    overflow: hidden; /* Clip potential effects */
}
.btn-primary {
    background-color: var(--accent-primary);
    color: var(--slate-200);
    border-color: var(--accent-primary);
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2); /* Initial subtle shadow */
}
.btn-primary:hover {
    background-color: color-mix(in srgb, var(--accent-primary) 90%, black);
    border-color: color-mix(in srgb, var(--accent-primary) 90%, black);
    color: var(--slate-200);
    transform: translateY(-2px) scale(1.02); /* Lift and slight scale */
    box-shadow: 0 8px 15px rgba(79, 70, 229, 0.35); /* Enhanced shadow */
}
.btn-secondary {
    background-color: transparent;
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}
.btn-secondary:hover {
    background-color: var(--accent-primary);
    color: var(--slate-200);
    transform: translateY(-2px); /* Consistent lift */
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2);
}

/* --- Hero Section --- */
.hero-section {
    background-color: var(--bg-dark); /* Base dark color */
    /* Subtle Gradient Overlay */
    background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.1) 0%, rgba(79, 70, 229, 0.05) 100%),
                      linear-gradient(to bottom right, var(--bg-dark) 60%, var(--bg-medium) 100%);
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-sm);
    border-bottom: var(--border-width) solid var(--border-color);
    position: relative; /* For potential absolute elements */
    overflow: hidden;
}
.hero-section h1 { margin-bottom: var(--spacing-sm); color: var(--text-light); }
.hero-section .subtitle { font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem); color: var(--text-medium); max-width: 650px; margin: 0 auto var(--spacing-lg) auto; }
/* Hero Button Pulsing Glow Animation */
.hero-cta {
    animation: pulseGlow 2.5s infinite ease-in-out;
}
@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2); transform: scale(1); }
    50% { box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4); transform: scale(1.03); }
}

/* --- Content Sections --- */
.content-section {
    padding: var(--spacing-xl) 0;
    border-bottom: var(--border-width) solid var(--border-color);
    position: relative; /* For pseudo-elements */
    overflow: hidden; /* Contain potential background effects */
}
/* Alternating Backgrounds with Gradients and Patterns */
/* Odd sections (relative to body, starting after hero) -> Darker Base */
body > section.content-section:nth-of-type(odd) {
     background-color: var(--bg-dark);
     /* Subtle gradient + dot pattern */
     background-image:
        radial-gradient(var(--slate-800) 1px, transparent 1px), /* Dots */
        linear-gradient(to bottom left, var(--bg-dark) 70%, color-mix(in srgb, var(--bg-dark) 90%, var(--accent-secondary) 10%)); /* Base gradient */
     background-size: 20px 20px, auto; /* Pattern size, gradient size */
}
/* Even sections -> Lighter Base */
body > section.content-section:nth-of-type(even) {
     background-color: var(--bg-medium);
     /* Subtle gradient only */
      background-image:
        linear-gradient(to top right, var(--bg-medium) 70%, color-mix(in srgb, var(--bg-medium) 90%, var(--accent-primary) 10%));
}

body > section:last-of-type { border-bottom: none; }
.section-intro { max-width: 650px; margin: 0 auto var(--spacing-lg) auto; text-align: center; color: var(--text-medium); }

/* --- Services Section --- */
.service-items { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.service-item { background-color: var(--bg-light); padding: var(--spacing-md); border-radius: var(--border-radius); border: var(--border-width) solid var(--border-color); text-align: center; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.service-item:hover { transform: translateY(-5px); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3); }
.service-icon { width: 48px; height: 48px; margin-bottom: var(--spacing-sm); }
.icon-design { color: var(--indigo-600); }
.icon-fullstack { color: var(--rose-600); }
.icon-ai { color: var(--amber-500); }
.icon-shop { color: var(--emerald-600); }

/* --- Skills Section Styles --- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.skill-card { background-color: var(--bg-light); padding: var(--spacing-md); border-radius: var(--border-radius); border: var(--border-width) solid var(--border-color); display: flex; flex-direction: column; align-items: flex-start; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.skill-card:hover { transform: translateY(-5px); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3); } /* Consistent hover lift */
.skill-icon { width: 36px; height: 36px; margin-bottom: var(--spacing-sm); color: var(--accent-primary); }
.skill-card h3 { margin-bottom: var(--spacing-xs); font-size: 1.2rem; }
.skill-card p { font-size: 0.95rem; color: var(--text-medium); margin-bottom: 0; }

/* --- Pricing Section --- */
.pricing-tiers { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.pricing-tier { background-color: var(--bg-light); padding: var(--spacing-lg); border-radius: var(--border-radius); border: var(--border-width) solid var(--border-color); display: flex; flex-direction: column; position: relative; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.pricing-tier:hover:not(.featured) { transform: translateY(-5px); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3); } /* Hover lift for non-featured */
.pricing-tier.featured { border-color: var(--accent-primary); border-width: 2px; transform: scale(1.03); box-shadow: 0 0 25px rgba(79, 70, 229, 0.2); z-index: 10; }
.featured-badge { position: absolute; top: -15px; left: 50%; transform: translateX(-50%); background-color: var(--accent-primary); color: var(--slate-200); padding: var(--spacing-xs) var(--spacing-sm); font-size: 0.8rem; font-weight: bold; border-radius: 20px; text-transform: uppercase; letter-spacing: 0.5px; }
.pricing-tier h3 { margin-top: 0; font-size: 1.4rem; }
.pricing-tier .price { font-size: 2rem; font-weight: 700; color: var(--accent-primary); margin-bottom: var(--spacing-md); }
.pricing-tier ul { margin-bottom: var(--spacing-lg); flex-grow: 1; }
.pricing-tier li { margin-bottom: var(--spacing-xs); padding-left: var(--spacing-md); position: relative; font-size: 0.95rem; }
.pricing-tier li::before { content: '✓'; color: var(--accent-success); position: absolute; left: 0; font-weight: bold; }
.pricing-tier .btn { margin-top: auto; }
.pricing-note { text-align: center; margin-top: var(--spacing-lg); font-size: 0.9rem; color: var(--text-medium); max-width: 700px; margin-left: auto; margin-right: auto; }

/* --- Portfolio Section Styles --- */
.portfolio-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: var(--spacing-lg); margin-top: var(--spacing-lg); }
.portfolio-item { background-color: var(--bg-light); border-radius: var(--border-radius); border: var(--border-width) solid var(--border-color); overflow: hidden; display: flex; flex-direction: column; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.portfolio-item:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3); } /* Consistent hover lift */
.portfolio-image-link { display: block; overflow: hidden; }
.portfolio-item img { display: block; width: 100%; height: 220px; object-fit: cover; object-position: top center; border-bottom: var(--border-width) solid var(--border-color); transition: transform 0.4s ease; }
.portfolio-item:hover img { transform: scale(1.03); }
.portfolio-info { padding: var(--spacing-md); display: flex; flex-direction: column; flex-grow: 1; }
.portfolio-info h3 { margin-bottom: var(--spacing-xs); font-size: 1.3rem; }
.portfolio-info p { font-size: 0.95rem; color: var(--text-medium); margin-bottom: var(--spacing-sm); flex-grow: 1; }
.portfolio-tech { display: flex; flex-wrap: wrap; gap: var(--spacing-xs); margin-bottom: var(--spacing-md); margin-top: auto; }
.tech-tag { display: inline-flex; align-items: center; background-color: var(--slate-700); color: var(--text-medium); font-size: 0.8rem; padding: var(--spacing-xxs) var(--spacing-xs); border-radius: 4px; white-space: nowrap; }
.tech-icon { width: 14px; height: 14px; margin-right: var(--spacing-xxs); color: var(--slate-300); vertical-align: middle; }
.portfolio-link { display: inline-block; margin-top: auto; padding: var(--spacing-xs) var(--spacing-sm); border: var(--border-width) solid var(--accent-primary); color: var(--accent-primary); font-size: 0.9rem; font-weight: 500; border-radius: var(--border-radius); text-align: center; transition: background-color 0.3s ease, color 0.3s ease; align-self: flex-start; }
.portfolio-link:hover { background-color: var(--accent-primary); color: var(--text-light); }
.portfolio-chip-icon {height:20px !important; padding-right: 5px;}

/* --- Contact Section --- */
.contact-container { max-width: 700px; margin: 0 auto; }
.contact-form .form-group { margin-bottom: var(--spacing-md); }
.contact-form label { display: block; margin-bottom: var(--spacing-xs); font-weight: 500; color: var(--text-medium); }
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea { width: 100%; padding: var(--spacing-sm); background-color: var(--bg-light); border: var(--border-width) solid var(--border-color); border-radius: var(--border-radius); color: var(--text-light); font-family: var(--font-body); font-size: 1rem; transition: border-color 0.3s ease, box-shadow 0.3s ease; }
.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus { outline: none; border-color: var(--accent-primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.3); }
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form button[type="submit"] { width: 100%; margin-top: var(--spacing-sm); }

/* --- Footer --- */
.site-footer-bottom { background-color: var(--bg-medium); padding: var(--spacing-md) 0; margin-top: var(--spacing-xl); text-align: center; border-top: var(--border-width) solid var(--border-color); }
.site-footer-bottom p { font-size: 0.9rem; color: var(--text-medium); margin-bottom: 0; }

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll Animation Styling */
.animate-on-scroll {
  opacity: 0;
  /* Keep transform for JS, transition handles the animation */
  transition: opacity var(--animation-duration) var(--animation-timing),
              transform var(--animation-duration) var(--animation-timing);
  transition-delay: var(--animation-delay); /* Use CSS variable for delay */
  transform: translateY(20px); /* Start slightly lower */
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* --- Responsiveness --- */
@media (max-width: 768px) {
    html { font-size: 15px; }
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }
    .header-container { flex-direction: column; gap: var(--spacing-sm); }
    .main-nav ul { justify-content: center; flex-wrap: wrap; gap: var(--spacing-sm); }
    .hero-section { min-height: 50vh; padding: var(--spacing-xl) var(--spacing-sm); }
    .content-section { padding: var(--spacing-lg) 0; }
    .skills-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }
    .pricing-tier.featured { transform: scale(1); } /* Reset featured scale */
    .portfolio-item img { height: 200px; }
    .contact-container { padding: 0 var(--spacing-sm); }

    /* Disable hero button pulse on smaller screens if too distracting */
    .hero-cta { animation: none; }
}

@media (max-width: 480px) {
    html { font-size: 14px; }
    .skills-grid, .service-items, .pricing-tiers, .portfolio-grid { grid-template-columns: 1fr; }
    .main-nav ul { gap: var(--spacing-xs) var(--spacing-sm); }
    .btn { padding: 0.65em 1.5em; font-size: 0.95rem; }
    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }
    h3 { font-size: 1.1rem; }
    .portfolio-info h3 { font-size: 1.2rem; }
}

/* Preference for reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto; /* Disable smooth scrolling */
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transition-delay: 0ms !important;
    animation-delay: 0ms !important;
  }
  .animate-on-scroll {
      opacity: 1;
      transform: translateY(0);
      transition: none;
  }
  .hero-cta { animation: none; }
}