/* style.css */

/* --- CSS Custom Properties --- */
:root {
    /* Color Palette */
    --bg-snow: #F4F4F4;
    --text-slate: #1A202C;
    --text-muted: #4A5568;
    --accent-pine: #3B5340;
    --accent-amber: #D97757;
    --card-bg: rgba(255, 255, 255, 0.6);
    
    /* Aurora Gradient Colors (Muted) */
    --aurora-1: rgba(59, 83, 64, 0.05);
    --aurora-2: rgba(217, 119, 87, 0.04);
    --aurora-3: rgba(26, 32, 44, 0.03);

    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Fluid Structure & Spacing */
    --max-width: 1100px;
    --spacing-sm: clamp(1rem, 2vw, 1.5rem);
    --spacing-md: clamp(2rem, 4vw, 3rem);
    --spacing-lg: clamp(4rem, 8vw, 6rem);
    --spacing-xl: clamp(6rem, 12vw, 10rem);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 100%;
}

body {
    background-color: var(--bg-snow);
    color: var(--text-slate);
    font-family: var(--font-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-image: 
        radial-gradient(circle at 15% 50%, var(--aurora-1), transparent 50%),
        radial-gradient(circle at 85% 30%, var(--aurora-2), transparent 50%),
        radial-gradient(circle at 50% 80%, var(--aurora-3), transparent 50%);
    background-attachment: fixed;
    animation: ambientShift 20s ease-in-out infinite alternate;
}

@keyframes ambientShift {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-snow);
}
::-webkit-scrollbar-thumb {
    background: rgba(59, 83, 64, 0.3);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-pine);
}

/* Custom Selection */
::selection {
    background-color: var(--accent-pine);
    color: var(--bg-snow);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* --- Typography --- */
h1, h2, h3 {
    font-weight: 600;
    line-height: 1.1;
    color: var(--text-slate);
    letter-spacing: -0.02em;
    text-wrap: balance;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: 1rem;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 3px;
    background-color: var(--accent-pine);
    transition: width var(--transition-smooth);
}

.section-title:hover::after {
    width: 100%;
}

a {
    text-decoration: none;
    color: var(--text-slate);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

/* --- Header & Navigation --- */
.site-header {
    background-color: rgba(244, 244, 244, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(26, 32, 44, 0.05);
    transition: padding var(--transition-smooth);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    color: var(--text-slate);
    position: relative;
}

.logo::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background-color: var(--accent-amber);
    border-radius: 50%;
    bottom: 6px;
    right: -10px;
    animation: pulse 2.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; box-shadow: 0 0 0 0 rgba(217, 119, 87, 0.4); }
    50% { transform: scale(1.2); opacity: 0.8; box-shadow: 0 0 0 6px rgba(217, 119, 87, 0); }
    100% { transform: scale(1); opacity: 1; box-shadow: 0 0 0 0 rgba(217, 119, 87, 0); }
}

.nav-links {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    position: relative;
}

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

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

.nav-links a:hover {
    color: var(--text-slate);
}

/* Mobile Nav Checkbox Hack */
.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    padding: 10px;
    z-index: 101;
}

.hamburger, .hamburger::before, .hamburger::after {
    display: block;
    background: var(--text-slate);
    height: 2px;
    width: 24px;
    position: relative;
    transition: var(--transition-smooth);
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
}

.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

.nav-toggle:checked ~ .nav-toggle-label .hamburger {
    background: transparent;
}
.nav-toggle:checked ~ .nav-toggle-label .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}
.nav-toggle:checked ~ .nav-toggle-label .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
}

@media (max-width: 768px) {
    .nav-toggle-label {
        display: block;
    }
    
    .site-nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: rgba(244, 244, 244, 0.95);
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-smooth);
        border-bottom: 1px solid rgba(26, 32, 44, 0.05);
        box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    }
    
    .nav-links {
        flex-direction: column;
        padding: var(--spacing-lg) var(--spacing-md);
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .nav-toggle:checked ~ .site-nav {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
}

/* --- Hero Section --- */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding-top: var(--spacing-lg);
}

.hero-title {
    font-size: clamp(3.5rem, 8vw, 6.5rem);
    letter-spacing: -0.04em;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--text-slate) 0%, var(--text-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    color: var(--text-muted);
    max-width: 650px;
    font-weight: 300;
}

.fade-in {
    animation: fadeUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(40px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* --- Experimentation Lab (Grid) --- */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    padding: var(--spacing-md);
    transition: all var(--transition-smooth);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(26, 32, 44, 0.02);
}

.project-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    box-shadow: inset 0 0 0 2px var(--accent-pine);
    opacity: 0;
    transform: scale(0.95);
    transition: var(--transition-smooth);
    pointer-events: none;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(26, 32, 44, 0.08), 0 10px 20px rgba(26, 32, 44, 0.04);
    background-color: #FFFFFF;
}

.project-card:hover::after {
    opacity: 0.1;
    transform: scale(1);
}

.card-content h3 {
    margin-bottom: 0.75rem;
    font-size: 1.5rem;
    transition: color var(--transition-fast);
}

.project-card:hover .card-content h3 {
    color: var(--accent-pine);
}

.card-content p {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 2rem;
}

.tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--bg-snow);
    background-color: var(--text-slate);
    padding: 0.4em 0.8em;
    border-radius: 20px;
    font-weight: 600;
    transition: var(--transition-fast);
    display: inline-block;
}

.project-card:hover .tag {
    background-color: var(--accent-amber);
    transform: scale(1.05);
}

/* --- Blog Chronicles (Timeline) --- */
.timeline {
    border-left: 2px solid rgba(59, 83, 64, 0.15);
    padding-left: clamp(1.5rem, 3vw, 2.5rem);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.timeline-item {
    position: relative;
    transition: transform var(--transition-smooth);
}

.timeline-item:hover {
    transform: translateX(10px);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(clamp(1.5rem, 3vw, 2.5rem) * -1 - 7px);
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--bg-snow);
    border: 3px solid var(--accent-pine);
    transition: var(--transition-smooth);
}

.timeline-item:hover::before {
    background-color: var(--accent-amber);
    border-color: var(--accent-amber);
    box-shadow: 0 0 15px rgba(217, 119, 87, 0.4);
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--accent-amber);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

.timeline-content h3 {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

.timeline-content p {
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
}

.text-link {
    font-weight: 600;
    color: var(--accent-pine);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.text-link::after {
    content: '→';
    transition: transform var(--transition-fast);
}

.text-link:hover::after {
    transform: translateX(5px);
}

/* --- Footer --- */
.site-footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid rgba(26, 32, 44, 0.05);
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
}

/* --- 404 Error Page --- */
.error-page {
    background-color: var(--text-slate);
    color: var(--bg-snow);
}

.error-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--spacing-md);
    background: radial-gradient(circle at center, rgba(59, 83, 64, 0.2) 0%, transparent 70%);
}

.error-code {
    font-size: clamp(6rem, 15vw, 12rem);
    line-height: 1;
    color: var(--bg-snow);
    opacity: 0.05;
    letter-spacing: -0.05em;
    font-weight: 800;
}

.error-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-top: -4rem;
    margin-bottom: var(--spacing-sm);
    color: var(--bg-snow);
    position: relative;
    z-index: 1;
}

.error-msg {
    max-width: 500px;
    color: #A0AEC0;
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

.btn-primary {
    display: inline-block;
    background-color: var(--accent-pine);
    color: var(--bg-snow);
    padding: 1rem 2.5rem;
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--accent-amber);
    border-color: var(--accent-amber);
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3), inset 0 0 20px rgba(217, 119, 87, 0.1);
}