/* ========================================
   CSS Variables & Reset
======================================== */
:root {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #111111;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-pink: #ff6b9d;
    --color-pink-light: #ff8fb3;
    --color-pink-dark: #e5557f;
    --color-border: #1a1a1a;

    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --space-xs: 0.375rem;
    --space-sm: 0.75rem;
    --space-md: 1.25rem;
    --space-lg: 2rem;
    --space-xl: 4rem;

    --transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Snowfall Effect
======================================== */
.snow-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.snowflake {
    position: absolute;
    top: -10px;
    pointer-events: none;
    color: rgba(255, 255, 255, 0.9);
    filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.8));
    will-change: transform;
}

.snowflake svg {
    display: block;
    width: 100%;
    height: 100%;
}

/* ========================================
   Navigation
======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--space-md) 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    transition: all var(--transition);
}

.nav.scrolled {
    padding: var(--space-sm) 0;
    background: rgba(10, 10, 10, 0.9);
    border-bottom: 1px solid rgba(255, 107, 157, 0.1);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    display: block;
}

/* Fallback text if image doesn't exist */
.nav-logo:empty::before {
    content: 'NP';
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.nav-logo:hover .logo-img {
    transform: scale(1.1);
    border-color: var(--color-pink);
    box-shadow: 0 0 20px rgba(255, 107, 157, 0.3);
}

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

.nav-links a {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
    letter-spacing: -0.01em;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-pink), var(--color-pink-light));
    transition: width var(--transition);
    border-radius: 2px;
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* ========================================
   Hero Section
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    position: relative;
    background: 
        radial-gradient(ellipse at top, rgba(255, 107, 157, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(255, 107, 157, 0.03) 0%, transparent 50%);
}

.hero-content {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    opacity: 0;
    animation: fadeIn 0.8s ease forwards 0.2s;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.5rem, 10vw, 5.5rem);
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--space-sm);
    opacity: 0;
    animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1) forwards 0.4s;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-name {
    background: linear-gradient(135deg, var(--color-pink) 0%, var(--color-pink-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    font-weight: 400;
    opacity: 0;
    animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1) forwards 0.6s;
    max-width: 600px;
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1) forwards 0.8s;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    animation: fadeIn 1s ease forwards 1.2s;
}

.hero-scroll span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-weight: 500;
}

.scroll-line {
    width: 2px;
    height: 50px;
    background: linear-gradient(to bottom, var(--color-pink), transparent);
    border-radius: 2px;
    animation: scrollLine 2.5s ease-in-out infinite;
}

@keyframes scrollLine {
    0%, 100% {
        opacity: 0.4;
        transform: translateY(0) scaleY(0.5);
    }
    50% {
        opacity: 1;
        transform: translateY(15px) scaleY(1);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 50px;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
    letter-spacing: -0.01em;
    position: relative;
    overflow: hidden;
}

.btn:not(.btn-link)::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:not(.btn-link):hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--color-pink);
    color: var(--color-bg);
    box-shadow: 0 4px 20px rgba(255, 107, 157, 0.3);
}

.btn-primary:hover {
    background: var(--color-pink-light);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 107, 157, 0.4);
}

.btn-link {
    background: transparent;
    color: var(--color-text);
    padding: 1rem 0;
    position: relative;
}

.btn-link::after {
    content: '→';
    margin-left: 0.5rem;
    transition: transform var(--transition-fast);
    display: inline-block;
}

.btn-link:hover {
    color: var(--color-pink);
}

.btn-link:hover::after {
    transform: translateX(4px);
}

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

section {
    padding: var(--space-lg) 0;
    position: relative;
    z-index: 1;
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.section-number {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-pink);
    letter-spacing: 0.05em;
    opacity: 0.8;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

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

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 157, 0.2), transparent);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.about-intro {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    line-height: 1.4;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
    font-weight: 400;
    letter-spacing: -0.01em;
}

.about-intro strong {
    color: var(--color-pink);
    font-weight: 600;
}

.about-desc {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text-muted);
}

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

.skill-item {
    padding: var(--space-md) var(--space-lg);
    border-left: 2px solid var(--color-border);
    transition: all var(--transition);
    background: rgba(255, 255, 255, 0.01);
    border-radius: 0 8px 8px 0;
}

.skill-item:hover {
    border-left-color: var(--color-pink);
    padding-left: calc(var(--space-lg) + 6px);
    background: rgba(255, 107, 157, 0.05);
    transform: translateX(4px);
}

.skill-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.skill-item p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ========================================
   Projects Section
======================================== */
.projects-filters {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
}

.filter-btn:hover {
    color: var(--color-text);
    border-color: var(--color-pink);
    background: rgba(255, 107, 157, 0.1);
}

.filter-btn.active {
    color: var(--color-pink);
    border-color: var(--color-pink);
    background: rgba(255, 107, 157, 0.15);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.project-card.hidden {
    display: none;
}

.project-card {
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    opacity: 0;
    transform: translateY(30px);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
    z-index: 0;
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    border-color: rgba(255, 107, 157, 0.4);
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-card:hover::before {
    opacity: 1;
}

.project-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-pink);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
    opacity: 0.9;
}

.project-title {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.project-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--space-sm);
}

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

.project-tags span {
    font-size: 0.75rem;
    padding: 0.375rem 0.875rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    border-radius: 20px;
    transition: all var(--transition-fast);
}

.project-card:hover .project-tags span {
    border-color: rgba(255, 107, 157, 0.3);
    background: rgba(255, 107, 157, 0.05);
}

.project-links {
    display: flex;
    gap: var(--space-xs);
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.project-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.625rem 1.25rem;
    color: var(--color-text-muted);
    text-decoration: none;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: all var(--transition-fast);
    background: rgba(255, 255, 255, 0.02);
    font-size: 0.875rem;
    font-weight: 500;
    min-height: 44px;
    position: relative;
    z-index: 1;
    cursor: pointer;
}

.project-link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.project-link span {
    white-space: nowrap;
}

.project-link:hover {
    color: var(--color-pink);
    border-color: var(--color-pink);
    background: rgba(255, 107, 157, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 157, 0.2);
}

.project-link:hover svg {
    transform: scale(1.1);
}

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

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 157, 0.2), transparent);
}

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

.contact-headline {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.contact-desc {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

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

.contact-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all var(--transition);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.contact-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: var(--color-pink);
    transform: scaleY(0);
    transition: transform var(--transition);
}

.contact-link:hover {
    border-color: rgba(255, 107, 157, 0.4);
    transform: translateX(8px);
    background: rgba(255, 107, 157, 0.05);
}

.contact-link:hover::before {
    transform: scaleY(1);
}

.link-label {
    font-weight: 500;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.link-value {
    color: var(--color-pink);
    font-weight: 500;
    font-size: 1rem;
}

.contact-link-email {
    cursor: pointer;
}

.copy-success {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    background: var(--color-pink);
    color: var(--color-bg);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    pointer-events: none;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 10;
    white-space: nowrap;
    box-shadow: 0 4px 20px rgba(255, 107, 157, 0.4);
}

.contact-link.copied .copy-success {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    animation: copySuccess 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.contact-link.copied .link-value {
    opacity: 0.3;
    transition: opacity 0.3s;
}

@keyframes copySuccess {
    0% {
        transform: translate(-50%, -50%) scale(0) rotate(-10deg);
        opacity: 0;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1) rotate(5deg);
    }
    100% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
        opacity: 1;
    }
}

/* ========================================
   Footer
======================================== */
.footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 157, 0.3), transparent);
}

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

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

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

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

    .nav {
        padding: var(--space-sm) 0;
    }

    .nav-container {
        padding: 0 var(--space-md);
    }

    .logo-img {
        width: 32px;
        height: 32px;
    }

    .nav-links {
        gap: var(--space-md);
    }

    .nav-links a {
        font-size: 0.8rem;
    }

    .hero {
        min-height: 100vh;
    }

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

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

    .btn {
        width: 100%;
    }

    .container {
        padding: 0 var(--space-md);
    }

    .hero-scroll {
        display: none;
    }

    .section-header {
        margin-bottom: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .section-header {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .about-intro {
        font-size: 1.25rem;
    }

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

    .project-links {
        flex-direction: column;
    }

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