/* ================================
   CSS Variables & Base
   ================================ */
:root {
    /* Colors - fresh, airy palette */
    --color-bg: #fafcfc;
    --color-bg-warm: #f8faf9;
    --color-sidebar: #ffffff;
    --color-text: #2d3436;
    --color-text-light: #636e72;
    --color-text-muted: #a0a8ab;
    --color-accent: #4a9e8f;
    --color-accent-soft: #e8f4f2;
    --color-border: #e8eced;
    --color-shadow: rgba(45, 52, 54, 0.06);
    
    /* Typography */
    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, sans-serif;
    
    /* Spacing */
    --sidebar-width: 240px;
    --content-max-width: 1100px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ================================
   Sidebar Navigation
   ================================ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-sidebar);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    z-index: 100;
}

.sidebar-header {
    padding-bottom: var(--spacing-lg);
}

.logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: -0.02em;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.7;
}

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

.nav-links a {
    display: block;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-light);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-text);
    background: var(--color-accent-soft);
}

.nav-links a.active {
    color: var(--color-accent);
    background: var(--color-accent-soft);
    font-weight: 500;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.social-link {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

/* ================================
   Main Content
   ================================ */
.content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ================================
   Hero Section
   ================================ */
.hero {
    position: relative;
    padding-bottom: var(--spacing-xl);
    max-width: var(--content-max-width);
}

.hero-text {
    position: relative;
    z-index: 1;
}

.greeting {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
    animation: fadeInUp 0.6s ease both;
}

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(3rem, 6vw, 4.5rem);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.6s ease 0.1s both;
}

.tagline {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 500px;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-accent {
    position: absolute;
    top: -40px;
    right: 10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--color-accent-soft) 0%, transparent 70%);
    opacity: 0.7;
    pointer-events: none;
    animation: breathe 8s ease-in-out infinite;
}

/* ================================
   Intro Section
   ================================ */
.intro {
    max-width: 650px;
    padding-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.3s both;
}

.intro p {
    font-size: 1.1rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ================================
   Featured Projects
   ================================ */
.featured-projects {
    max-width: var(--content-max-width);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.featured-projects h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.project-card {
    display: block;
    background: var(--color-sidebar);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-smooth);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px var(--color-shadow);
    border-color: transparent;
}

.project-card:hover .project-image {
    transform: scale(1.02);
}

.project-image {
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-smooth);
    overflow: hidden;
}

.placeholder-text {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.project-info {
    padding: 1.5rem;
}

.project-info h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.project-info p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

.view-all {
    display: inline-block;
    font-size: 0.95rem;
    color: var(--color-accent);
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

.view-all:hover {
    opacity: 0.7;
}

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

@keyframes breathe {
    0%, 100% {
        transform: scale(1);
        opacity: 0.7;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.5;
    }
}

/* ================================
   Page Headers
   ================================ */
.page-header {
    max-width: var(--content-max-width);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease both;
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}

.page-intro {
    font-size: 1.1rem;
    color: var(--color-text-light);
    max-width: 650px;
    line-height: 1.7;
}

/* ================================
   Projects List (Overview Pages)
   ================================ */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: var(--content-max-width);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.project-card-large {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-md);
    background: var(--color-sidebar);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-smooth);
}

.project-card-large:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px var(--color-shadow);
    border-color: transparent;
}

.project-card-large .project-image {
    aspect-ratio: 4 / 3;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-smooth);
}

.project-card-large:hover .project-image {
    transform: scale(1.02);
}

.project-card-large .project-info {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project-card-large .project-info h2 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 500;
    line-height: 1.3;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.project-meta-tag {
    font-size: 0.8rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.project-card-large .project-info p:last-child {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ================================
   Responsive
   ================================ */
@media (max-width: 900px) {
    :root {
        --sidebar-width: 200px;
    }
    
    .content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .project-card-large {
        grid-template-columns: 1fr;
    }
    
    .project-card-large .project-image {
        aspect-ratio: 16 / 9;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        width: 100%;
        height: auto;
        flex-direction: row;
        align-items: center;
        padding: var(--spacing-sm) var(--spacing-md);
        border-right: none;
        border-top: 1px solid var(--color-border);
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
    }
    
    .sidebar-header {
        padding-bottom: 0;
    }
    
    .nav-links {
        flex-direction: row;
        gap: 0;
        margin-left: auto;
    }
    
    .nav-links a {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
    
    .sidebar-footer {
        display: none;
    }
    
    .content {
        margin-left: 0;
        padding-bottom: 100px;
    }
    
    .hero-accent {
        display: none;
    }
}