/* ===== CSS Variables ===== */
:root {
    --color-bg: #0a0a0b;
    --color-bg-secondary: #111113;
    --color-bg-tertiary: #1a1a1d;
    --color-text: #ffffff;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-accent-dark: #4f46e5;
    --color-border: #27272a;
    --color-gradient-start: #6366f1;
    --color-gradient-end: #a855f7;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --spacing-3xl: 8rem;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;
}

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

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

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

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

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

ul {
    list-style: none;
}

/* ===== Utilities ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-header {
    margin-bottom: var(--spacing-2xl);
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

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

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: all var(--transition-normal);
}

.nav.scrolled {
    background: rgba(10, 10, 11, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

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

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

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

.nav-cta {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: var(--radius-full);
    color: white !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    padding: var(--spacing-3xl) 0;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.1) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-greeting {
    font-size: 1.125rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 480px;
    margin-bottom: var(--spacing-xl);
}

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

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero-image-wrapper {
    position: relative;
    width: 400px;
    height: 500px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    z-index: 2;
}

.hero-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
}

.hero-image-decoration {
    position: absolute;
    top: 30px;
    right: -30px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-lg);
    z-index: 1;
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    position: relative;
}

.scroll-indicator::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.5; transform: translateX(-50%) translateY(10px); }
}

/* ===== About Section ===== */
.about {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-lead {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

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

.about-text strong {
    color: var(--color-accent);
}

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

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

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.about-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
}

/* ===== Experience Section ===== */
.experience {
    padding: var(--spacing-3xl) 0;
}

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

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

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-2xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-xl) - 5px);
    top: 0;
    width: 12px;
    height: 12px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    box-shadow: 0 0 0 4px var(--color-bg), 0 0 20px rgba(99, 102, 241, 0.5);
}

.timeline-date {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.timeline-content {
    background: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    border-color: var(--color-accent);
    transform: translateX(10px);
}

.timeline-company {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.timeline-role {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.timeline-content p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.timeline-tags span {
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* ===== Skills Section ===== */
.skills {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

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

.skill-card {
    background: var(--color-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.skill-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.skill-icon {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

.skill-icon svg {
    width: 100%;
    height: 100%;
}

.skill-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

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

/* ===== Gallery Section ===== */
.gallery {
    padding: var(--spacing-3xl) 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: repeat(2, 250px);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-item-large {
    grid-row: span 2;
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-lg);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay span {
    font-size: 0.9rem;
    color: white;
}

.hobbies {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.hobby {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.hobby:hover {
    border-color: var(--color-accent);
}

.hobby-icon {
    font-size: 1.5rem;
}

/* ===== Contact Section ===== */
.contact {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
}

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

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    text-align: left;
}

.contact-link:hover {
    border-color: var(--color-accent);
    transform: translateY(-3px);
}

.contact-link-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.contact-link-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.contact-link-text {
    display: flex;
    flex-direction: column;
}

.contact-link-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contact-link-value {
    font-size: 1rem;
    color: var(--color-text);
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-location {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.hero-text > * {
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.hero-greeting { animation-delay: 0.1s; }
.hero-title { animation-delay: 0.2s; }
.hero-subtitle { animation-delay: 0.3s; }
.hero-description { animation-delay: 0.4s; }
.hero-cta { animation-delay: 0.5s; }

.hero-image {
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}

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

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

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

    .hero-image-wrapper {
        width: 300px;
        height: 380px;
    }

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

    .about-image {
        order: -1;
    }

    .about-image img {
        height: 400px;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .gallery-item-large {
        grid-row: span 1;
    }

    .gallery-item {
        height: 300px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-image-wrapper {
        width: 250px;
        height: 320px;
    }

    .hero-image-decoration {
        display: none;
    }

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

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

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

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .hobbies {
        gap: var(--spacing-sm);
    }

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

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

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

    .btn {
        width: 100%;
    }
}