/* ==========================================================================
   CSS Variables & Reset
   ========================================================================== */
:root {
    /* Colors - Minimalist & Premium */
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text-main: #0a0a0a;
    --color-text-muted: #555555;
    --color-accent: #000000; /* Subtle accent, black */
    --color-border: #e0e0e0;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1.25rem;
    --space-md: 2.5rem;
    --space-lg: 5rem;
    --space-xl: 10rem;

    /* Layout */
    --container-width: 1100px;
    --header-height: 80px;

    /* Effects */
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.08);
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

/* ==========================================================================
   Typography & Basic Elements
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text-main);
    margin-bottom: var(--space-sm);
}

p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

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

ul {
    list-style: none;
}

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

/* ==========================================================================
   Layout & Utilities
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--color-accent);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-weight: 500;
    font-size: 1rem;
    text-align: center;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: #000000;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-main);
    border-color: var(--color-accent);
}

.btn-outline:hover {
    background-color: var(--color-accent);
    color: var(--color-surface);
}

.btn-block {
    display: block;
    width: 100%;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.header.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav-list {
    display: flex;
    gap: var(--space-md);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-main);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
    z-index: 1001;
}

.nav-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-main);
    transition: all var(--transition-fast);
}

/* ==========================================================================
   Animations
   ========================================================================== */
.fade-in {
    opacity: 0;
    animation: fadeIn var(--transition-slow) forwards;
}

.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Fallback for disabled JS */
noscript .fade-up {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    position: relative;
    overflow: hidden;
}

.project-iframe-preview {
    width: 100%;
    height: 240px;
    border: none;
    border-bottom: 1px solid var(--color-border);
    pointer-events: none;
    background-color: var(--color-bg);
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,0,0,0.03) 0%, rgba(250,250,250,0) 70%);
    border-radius: 50%;
    filter: blur(40px);
    z-index: 0;
    pointer-events: none;
    animation: pulseGlow 8s ease-in-out infinite alternate;
}

@keyframes pulseGlow {
    from { opacity: 0.6; transform: translate(-50%, -50%) scale(0.9); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
}

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

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(3.5rem, 8vw, 6rem);
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 0.25rem;
    line-height: 1.05;
}

.hero-profession {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 400;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.5px;
}

.hero-intro {
    font-size: 1.25rem;
    max-width: 650px;
    margin-bottom: var(--space-sm);
    color: var(--color-text-main);
    line-height: 1.7;
}

.hero-tagline {
    font-size: 1.1rem;
    max-width: 600px;
    margin-bottom: var(--space-md);
    font-style: italic;
    color: var(--color-text-muted);
}

.hero-buttons {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.hero-socials {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-main);
    transition: all var(--transition-normal);
}

.social-icon:hover {
    background-color: var(--color-accent);
    color: var(--color-surface);
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-content {
    max-width: 100%;
}

.about-text {
    font-size: 1.25rem;
    line-height: 1.8;
    max-width: 800px;
    margin-bottom: var(--space-lg);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-sm);
}

.stat-card {
    background-color: var(--color-surface);
    padding: var(--space-md);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-main);
}

.stat-desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
}

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

.skill-category {
    background-color: var(--color-surface);
    padding: var(--space-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.skill-category-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skill-item {
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.skill-item::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-md);
}

.project-card {
    background-color: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-image-placeholder {
    width: 100%;
    height: 240px;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.project-image-placeholder::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transform: translateX(-100%);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    100% {
        transform: translateX(100%);
    }
}

.project-content {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
    font-weight: 700;
}

.project-description {
    flex-grow: 1;
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
}

.project-tech span {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.35rem 0.85rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    color: var(--color-text-main);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

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

.project-link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-main);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.project-link:hover {
    background-color: var(--color-accent);
    color: var(--color-surface);
    border-color: var(--color-accent);
}

/* ==========================================================================
   Experience Section
   ========================================================================== */
.experience-timeline {
    max-width: 800px;
    position: relative;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 2px;
    background-color: var(--color-border);
}

.experience-item {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.experience-item:last-child {
    margin-bottom: 0;
}

.experience-item::before {
    content: '';
    position: absolute;
    top: 6px;
    left: -5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-accent);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    margin-bottom: 0.25rem;
}

.experience-role {
    font-size: 1.25rem;
    margin-bottom: 0;
}

.experience-date {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.experience-company {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-weight: 400;
    margin-bottom: var(--space-sm);
}

/* ==========================================================================
   Testimonials Section
   ========================================================================== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
}

.testimonial-card {
    background-color: var(--color-surface);
    padding: var(--space-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.testimonial-text {
    font-size: 1.1rem;
    font-style: italic;
    margin-bottom: var(--space-md);
    position: relative;
}

.testimonial-author {
    font-size: 1rem;
    margin-bottom: 0;
}

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

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.contact-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.contact-details {
    margin: var(--space-md) 0;
}

.contact-item {
    margin-bottom: var(--space-sm);
    font-size: 1.1rem;
}

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

.social-link {
    font-weight: 500;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
}

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

/* Form Styles */
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0 var(--space-md);
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-md);
}

.footer-brand .logo {
    font-size: 2rem;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-link {
    font-weight: 500;
}

.footer-link:hover {
    color: var(--color-text-main);
}

.footer-socials {
    display: flex;
    gap: var(--space-sm);
}

.footer-social-link {
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.footer-social-link:hover {
    color: var(--color-text-main);
}

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

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 992px) {
    :root {
        --space-xl: 6rem;
    }

    .contact-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --space-xl: 4rem;
        --space-lg: 3rem;
        --space-md: 1.5rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-surface);
        padding: var(--space-lg) var(--space-md);
        transition: left var(--transition-normal);
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: var(--space-lg);
    }

    .nav-link {
        font-size: 1.25rem;
    }

    /* Hamburger Animation */
    .nav-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

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

    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 2rem;
    }

    .btn {
        width: 100%;
    }
}