/* 
   G K Nirkhunan - Premium Portfolio Styles
   Design Philosophy: Minimalist, Strategic, High-Impact
*/

:root {
    /* Color Palette */
    --color-bg: #ffffff;
    --color-text-primary: #111111;
    --color-text-secondary: #555555;
    --color-accent: #1a365d;
    /* Deep Royal Blue - representing Strategy/Trust */
    --color-accent-light: #e6ebf1;
    --color-border: #e0e0e0;
    --color-surface: #f9f9f9;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Playfair Display', serif;
    /* Serif for headings to add sophistication */

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Logic */
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --border-radius: 4px;
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography Utilities */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: 1.5rem;
    font-family: var(--font-primary);
    /* Functional headers keep sans-serif */
    letter-spacing: -0.01em;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    max-width: 65ch;
}

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

ul {
    list-style: none;
}

/* Layout Utilities */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

section {
    padding: var(--spacing-lg) 0;
}

/* Header / Nav */
header {
    padding: 0.5rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

header.scrolled {
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 100%;
    /* Override container max-width so nav extends full width */
}

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    opacity: 0.7;
}

.nav-links a:hover {
    opacity: 1;
    color: var(--color-accent);
}

/* Global vs Local Nav */
.nav-global {
    color: var(--color-accent);
    font-weight: 600;
}

.nav-separator {
    color: var(--color-border);
    margin: 0 0.5rem;
}

/* Mobile Navigation */
@media (max-width: 768px) {
    header.scrolled {
        padding: var(--spacing-sm) 0;
    }

    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    /* Changed from center - so content starts at same position regardless of content amount */
    justify-content: center;
    text-align: center;
    padding: 6rem 2rem 4rem 2rem !important;
    /* Match dataMKT: 6rem padding + 80px margin */
    margin-top: 80px;
    margin-bottom: 3rem;
    /* No background color here - home page is white, case study pages use inline styles for blue */
}

.hero-content {
    max-width: 1000px;
    opacity: 0;
    animation: fadeIn 1s ease-out forwards;
}

.eyebrow {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: rgba(255, 255, 255, 0.9);
    /* White text on blue background */
    margin-bottom: var(--spacing-sm);
    display: block;
    font-weight: 600;
}

.hero-cta {
    margin-top: var(--spacing-md);
    display: inline-block;
    padding: 1rem 2rem;
    border: 1px solid white;
    /* White border on blue background */
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.9rem;
    color: white;
}

.hero-cta:hover {
    background: white;
    color: var(--color-accent);
    /* Inverted colors on hover */
}

/* About/Profile Section */
.profile-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
    align-items: start;
    margin-top: var(--spacing-md);
}

.profile-meta span {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-xs);
}

.profile-bio p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

/* Work / Portfolio Section */
.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.work-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: var(--transition);
    display: block;
    /* Make whole card clickable */
    position: relative;
    overflow: hidden;
}

.work-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border-color: var(--color-accent);
}

.work-card h3 {
    margin-bottom: var(--spacing-xs);
}

.work-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-accent-light);
    color: var(--color-accent);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-weight: 600;
}

/* Footer */
footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xl);
}

/* Interaction Cards */
.interaction-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
}

.interaction-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    border-color: var(--color-accent-light);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-icon {
    font-size: 0.9rem;
    border: 1px solid transparent;
    padding: 0.5rem 1rem;
    border-radius: 0;
    transition: border-color 0.2s ease;
}

.social-icon:hover {
    border-color: var(--color-text-primary);
    border-radius: 0;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 5rem;
    }

    .profile-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2.5rem;
    }
}