/* ===================================
   CSS Variables
   =================================== */
:root {
    /* Colors */
    --color-primary: #2563EB;
    --color-primary-dark: #1E40AF;
    --color-primary-light: #3B82F6;

    --color-bg: #FAFAFA;
    --color-bg-alt: #FFFFFF;
    --color-bg-dark: #F5F5F5;

    --color-text: #333333;
    --color-text-light: #6B7280;
    --color-text-lighter: #9CA3AF;

    --color-border: #E5E7EB;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-regular);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* ===================================
   Container
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    cursor: pointer;
}

.nav-profile-photo {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-primary);
    transition: var(--transition-base);
}

.nav-profile-photo:hover {
    transform: scale(1.05);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.nav-logo-text {
    display: flex;
    flex-direction: column;
}

.logo-accent {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1.2;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link.contact-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.nav-link.contact-btn:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) 0;
    margin-top: 70px;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-image-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero-image {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    overflow: hidden;
    background-color: var(--color-bg-dark);
    box-shadow: var(--shadow-xl);
    transition: var(--transition-slow);
    position: relative;
}

.hero-image:hover {
    transform: scale(1.05);
    box-shadow: 0 25px 50px -12px rgba(37, 99, 235, 0.25);
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.social-links a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    transition: var(--transition-base);
}

.social-links a:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-text {
    animation: fadeInUp 1s ease;
}

.greeting {
    display: block;
    font-size: 1.25rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.main-title {
    display: block;
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
    border: none;
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-text);
}

.btn-secondary:hover {
    background-color: var(--color-text);
    color: white;
}

.btn-full {
    width: 100%;
}

/* ===================================
   Section Styles
   =================================== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    line-height: 1.2;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-intro {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text);
}

.about-text p {
    line-height: 1.8;
    color: var(--color-text-light);
}

.about-skills {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.skill-category h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.skill-category ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.skill-category li {
    color: var(--color-text-light);
    padding-left: var(--spacing-md);
    position: relative;
}

.skill-category li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

/* ===================================
   Education Section with Flip Cards
   =================================== */
.education {
    background-color: var(--color-bg-alt);
}

.education-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

/* Flip Card Container */
.flip-card {
    perspective: 1000px;
    height: 320px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

/* Front and Back Face Shared Styles */
.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
}

/* Front Face */
.flip-card-front {
    background-color: var(--color-bg);
    transform: rotateY(0deg);
}

.flip-card-front .credential-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    transition: var(--transition-base);
}

.flip-card:hover .flip-card-front .credential-icon {
    transform: scale(1.1);
}

.flip-card-front h4 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.flip-card-front p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.5;
}

/* Back Face */
.flip-card-back {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    transform: rotateY(180deg);
    justify-content: flex-start;
    align-items: flex-start;
    text-align: left;
}

.flip-card-back h4 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: white;
    margin-bottom: var(--spacing-xs);
}

.education-date {
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.flip-card-back p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.flip-card-back p:last-child {
    margin-top: auto;
    font-weight: var(--font-weight-semibold);
}

/* ===================================
   Experience Section
   =================================== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-border));
}

.timeline-item {
    position: relative;
    padding-left: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.timeline-content {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.timeline-content:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.timeline-date {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.timeline-content > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.achievement-list {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.achievement-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-light);
    line-height: 1.7;
}

.achievement-list strong {
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.tech-tags span {
    padding: 0.375rem 0.875rem;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.tech-tags span:hover {
    background-color: var(--color-primary);
    color: white;
}

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

.lanca-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.lanca-description h3 {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.lanca-description > p {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.lanca-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.feature-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.feature-text h4 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.feature-text p {
    color: var(--color-text-light);
    line-height: 1.6;
}

.lanca-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.gallery-item {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-color: var(--color-bg-dark);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    aspect-ratio: 9 / 16;
}

.gallery-item.main-image {
    grid-column: 1 / -1;
    aspect-ratio: 16 / 9;
}

.gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-3xl);
}

.contact-intro {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.contact-method {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.contact-method:hover {
    border-color: var(--color-primary);
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

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

.method-text h4 {
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.method-text p {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

.location {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-light);
}

.contact-form-wrapper {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--color-text);
    color: var(--color-bg);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-bg);
    font-weight: var(--font-weight-medium);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary-light);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image-wrapper {
        order: -1;
    }

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

    .hero-buttons {
        justify-content: center;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .lanca-content {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .main-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--color-bg-alt);
        width: 100%;
        padding: var(--spacing-xl);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
    }

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

    .hamburger {
        display: flex;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .education-cards {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        padding-left: var(--spacing-xl);
    }

    .lanca-gallery {
        grid-template-columns: 1fr;
    }

    .footer .container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .nav-profile-photo {
        width: 38px;
        height: 38px;
    }

    .logo-accent {
        font-size: 1.1rem;
    }

    .logo-subtitle {
        font-size: 0.65rem;
    }

    .main-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .hero-image {
        width: 220px;
        height: 220px;
    }
}