/* ================================
   CSS Custom Properties
   ================================ */
:root {
    /* Colors - Warm, professional palette */
    --color-bg: #fafafa;
    --color-bg-alt: #ffffff;
    --color-text: #1a1a2e;
    --color-text-muted: #4a4a68;
    --color-text-light: #6b6b8a;
    --color-accent: #2d5a7b;
    --color-accent-light: #3d7aa3;
    --color-accent-subtle: #e8f1f7;
    --color-highlight: #c9a227;
    --color-border: #e0e0e8;
    --color-card: #ffffff;

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* Other */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
    --transition: 0.3s ease;
}

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

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

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

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

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

a:hover {
    color: var(--color-accent-light);
}

ul {
    list-style: none;
}

/* ================================
   Layout
   ================================ */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-2xl) 0;
}

/* ================================
   Navigation
   ================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: var(--space-lg);
}

.nav-menu a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-menu a:hover {
    color: var(--color-accent);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* ================================
   Hero Section
   ================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-2xl) var(--space-lg);
    padding-top: calc(var(--space-2xl) + 60px);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 700px;
}

.hero-intro {
    font-size: 1.1rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    letter-spacing: -1px;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--space-xl);
}

.hero-tagline .highlight {
    color: var(--color-accent);
    font-weight: 600;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
}

.hero-image {
    width: 400px;
    height: 400px;
    object-fit: cover;
    object-position: top;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    border: 4px solid var(--color-bg-alt);
}

/* ================================
   Buttons
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--color-accent-light);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-secondary:hover {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

/* ================================
   Section Titles
   ================================ */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    letter-spacing: -0.5px;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-bottom: var(--space-xl);
    max-width: 600px;
}

/* ================================
   About Section
   ================================ */
.about {
    background: var(--color-bg-alt);
}

.about-content {
    display: grid;
    gap: var(--space-xl);
}

.about-text p {
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
}

.about-text .lead {
    font-size: 1.25rem;
    color: var(--color-text);
    font-weight: 500;
    line-height: 1.5;
}

.about-subheading {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.about-highlights {
    display: flex;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.highlight-item {
    display: flex;
    flex-direction: column;
}

.highlight-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.highlight-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ================================
   Skills Section
   ================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.skill-category {
    background: var(--color-card);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.skill-category h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.skill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.skill-item:last-child {
    border-bottom: none;
}

.skill-name {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.skill-level {
    font-size: 0.75rem;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

/* ================================
   Projects Section
   ================================ */
.projects {
    background: var(--color-bg-alt);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    height: 180px;
    background: linear-gradient(135deg, var(--color-accent-subtle) 0%, #f0f4f8 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-text-light);
}

.project-content {
    padding: var(--space-lg);
}

.project-content h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

.project-content p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* ================================
   Blog Section
   ================================ */
.blog-cta {
    text-align: center;
    max-width: 600px;
    margin: var(--space-xl) auto 0;
}

.blog-cta p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.blog-loading {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-xl);
    grid-column: 1 / -1;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.blog-card {
    background: var(--color-card);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.blog-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    font-size: 0.8rem;
}

.blog-meta time {
    color: var(--color-text-light);
}

.blog-category {
    color: var(--color-accent);
    font-weight: 500;
}

.blog-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

.blog-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
}

.blog-link {
    font-size: 0.9rem;
    font-weight: 500;
}

.idea-list {
    list-style: disc;
    padding-left: var(--space-lg);
}

.idea-list li {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-xs);
}

.placeholder-post {
    background: var(--color-bg);
    border-style: dashed;
}

/* ================================
   Contact Section
   ================================ */
.contact {
    background: var(--color-bg-alt);
}

.contact-content {
    max-width: 600px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.contact-item:hover {
    border-color: var(--color-accent);
    transform: translateX(8px);
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

.contact-details {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.8rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-value {
    color: var(--color-text);
    font-weight: 500;
}

/* ================================
   Footer
   ================================ */
.footer {
    padding: var(--space-lg);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* ================================
   Mobile Responsive
   ================================ */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-bg-alt);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding-top: calc(var(--space-xl) + 60px);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .about-highlights {
        flex-direction: column;
        gap: var(--space-md);
    }

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

    .hero-visual {
        position: static;
        transform: none;
        margin-top: var(--space-xl);
        display: flex;
        justify-content: center;
    }

    .hero-image {
        width: 250px;
        height: 250px;
    }

    .hero {
        flex-direction: column;
        text-align: center;
    }
}

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

.hero-content > * {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.hero-intro { animation-delay: 0.1s; }
.hero h1 { animation-delay: 0.2s; }
.hero-tagline { animation-delay: 0.3s; }
.hero-cta { animation-delay: 0.4s; }