/* ============================================
   Apple-Inspired Portfolio
   Clean, minimal, premium aesthetic
   ============================================ */

/* CSS Custom Properties */
:root {
    --color-bg: #ffffff;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-border: #d2d2d7;
    --color-surface: #f5f5f7;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    --spacing-2xl: 12rem;

    --max-width: 980px;
    --max-width-narrow: 680px;

    --sidebar-width: 200px;

    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-slow: 0.8s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

::selection {
    background-color: var(--color-accent);
    color: white;
}

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

/* Background Shapes - Subtle AI-inspired elements */
.bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.03;
    filter: blur(100px);
}

.shape-1 {
    width: 800px;
    height: 800px;
    background: var(--color-accent);
    top: -400px;
    right: -200px;
}

.shape-2 {
    width: 600px;
    height: 600px;
    background: #5856d6;
    bottom: 20%;
    left: -300px;
}

.shape-3 {
    width: 500px;
    height: 500px;
    background: var(--color-accent);
    bottom: -200px;
    right: 10%;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-bg);
    z-index: 1000;
    border-right: 1px solid rgba(0, 0, 0, 0.05);
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-lg) var(--spacing-md);
}

.sidebar-monogram {
    font-family: var(--font-primary);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
}

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

.sidebar-link {
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.sidebar-link.active {
    color: var(--color-text);
}

.sidebar-cv {
    margin-top: auto;
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.sidebar-cv:hover {
    color: var(--color-text);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.neural-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-name {
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: clamp(40px, 8vw, 80px);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.05;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: clamp(19px, 2.5vw, 24px);
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.4;
    max-width: 600px;
    margin: 0 auto;
}

.hero-cv {
    display: inline-block;
    margin-top: var(--spacing-lg);
    font-size: 14px;
    font-weight: 600;
    color: white;
    background: var(--color-text);
    padding: 14px 28px;
    border-radius: 8px;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.hero-cv:hover {
    background: var(--color-accent);
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    transition: opacity var(--transition-medium);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.scroll-arrow {
    width: 16px;
    height: 16px;
    border-right: 2px solid var(--color-text-secondary);
    border-bottom: 2px solid var(--color-text-secondary);
    transform: rotate(45deg);
    opacity: 0.5;
    animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
    0%, 100% {
        transform: rotate(45deg) translateY(0);
        opacity: 0.5;
    }
    50% {
        transform: rotate(45deg) translateY(6px);
        opacity: 0.3;
    }
}

/* Sections */
.section {
    padding: var(--spacing-2xl) var(--spacing-md);
}

.section-alt {
    background-color: var(--color-surface);
}

.section-content {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.section-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.section-text {
    font-size: 19px;
    line-height: 1.58;
    color: var(--color-text-secondary);
}

/* Experience Section */
.experience-list {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.experience-item {
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.experience-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--spacing-xs);
}

.experience-company {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.experience-period {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.experience-role {
    font-size: 17px;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.experience-desc {
    font-size: 17px;
    line-height: 1.58;
    color: var(--color-text-secondary);
}

/* Projects Section */
.section-projects {
    background-color: var(--color-surface);
}

.section-projects .section-header {
    max-width: var(--max-width);
    margin: 0 auto var(--spacing-lg);
    text-align: center;
}

.projects-showcase {
    max-width: 1200px;
    margin: 0 auto;
}

/* Featured Project (Full Width) */
.project-feature {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    background: var(--color-bg);
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.project-feature:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.project-feature-image {
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.project-image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #e8e8ed 0%, #d2d2d7 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.project-image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-feature-content {
    padding: var(--spacing-lg);
    padding-left: 0;
}

.project-feature-title {
    font-size: clamp(28px, 3vw, 36px);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.project-feature-desc {
    font-size: 17px;
    line-height: 1.58;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.project-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.project-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-accent);
    transition: opacity var(--transition-fast);
}

.project-link:hover {
    opacity: 0.7;
}

.project-link-secondary {
    color: var(--color-text-secondary);
}

/* Project Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.project-card {
    background: var(--color-bg);
    border-radius: 16px;
    overflow: hidden;
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
}

.project-card-image {
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.project-card-content {
    padding: var(--spacing-md);
}

.project-title {
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.project-desc {
    font-size: 15px;
    line-height: 1.53;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.project-tech span {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: rgba(0, 0, 0, 0.04);
    padding: 4px 10px;
    border-radius: 4px;
}

/* Contact Section */
.section-contact {
    text-align: center;
}

.section-contact .section-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.contact-links {
    margin-top: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-lg);
}

.contact-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    transition: transform var(--transition-fast);
}

.contact-link:hover {
    transform: translateY(-2px);
}

.contact-link-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-secondary);
}

.contact-link-value {
    font-size: 17px;
    font-weight: 500;
    color: var(--color-accent);
}

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

.footer p {
    font-size: 13px;
    color: var(--color-text-secondary);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 1s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}

.fade-in.delay-1 {
    animation-delay: 0.2s;
}

.fade-in.delay-2 {
    animation-delay: 0.4s;
}

.fade-in.delay-3 {
    animation-delay: 0.6s;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.1, 0.25, 1),
                transform 0.8s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1001;
    padding: 0 var(--spacing-md);
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.mobile-logo {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.mobile-menu-btn {
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.hamburger {
    width: 20px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 2px;
    background: var(--color-text);
    left: 0;
    transition: transform var(--transition-fast);
}

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

.hamburger::after {
    top: 6px;
}

/* Hamburger animation when menu is open */
.mobile-menu-btn.active .hamburger {
    background: transparent;
}

.mobile-menu-btn.active .hamburger::before {
    transform: rotate(45deg) translate(4px, 4px);
}

.mobile-menu-btn.active .hamburger::after {
    transform: rotate(-45deg) translate(4px, -4px);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

.mobile-nav.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-link {
    font-size: 24px;
    font-weight: 500;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

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

.mobile-nav-cv {
    margin-top: var(--spacing-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-accent);
    padding: 12px 24px;
    border: 1px solid var(--color-accent);
    border-radius: 8px;
}

/* Responsive Design */
@media (max-width: 968px) {
    .project-feature {
        grid-template-columns: 1fr;
    }

    .project-feature-content {
        padding: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    body {
        font-size: 15px;
    }

    .sidebar {
        display: none;
    }

    .mobile-header {
        display: flex;
    }

    .mobile-nav {
        display: flex;
    }

    .main-content {
        margin-left: 0;
        padding-top: 60px;
    }

    .hero {
        min-height: calc(100vh - 60px);
        padding: var(--spacing-lg) var(--spacing-md);
    }

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

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .contact-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .experience-header {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .experience-period {
        order: -1;
    }

    .scroll-indicator {
        bottom: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-cv {
        display: inline-block;
        padding: 12px 24px;
        background: var(--color-accent);
        color: white;
        border-radius: 8px;
        margin-top: var(--spacing-md);
    }

    .hero-cv:hover {
        opacity: 0.9;
    }

    .section-title {
        font-size: 24px;
    }

    .section-text {
        font-size: 16px;
    }

    .project-card-content {
        padding: var(--spacing-sm);
    }

    .project-feature-content {
        padding: var(--spacing-sm);
    }

    .experience-company {
        font-size: 20px;
    }

    .experience-desc {
        font-size: 15px;
    }

    .contact-link {
        width: 100%;
        padding: var(--spacing-sm);
        background: var(--color-surface);
        border-radius: 12px;
    }

    .mobile-nav-link {
        font-size: 20px;
    }

    .footer {
        padding: var(--spacing-md);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .fade-in,
    .fade-up {
        animation: none;
        opacity: 1;
        transform: none;
        transition: none;
    }

    .scroll-line {
        animation: none;
    }

    .project-card {
        transition: none;
    }
}