:root {
    --color-bg: #f8f8f8;
    --color-text: #1a1a1a;
    --color-primary: #5f9ea0;
    --color-secondary: #333333;
    --color-border: #e0e0e0;
    --font-family: "Space Grotesk", sans-serif;
}

body.dark-mode {
    --color-bg: #1a1a1a;
    --color-text: #f0f0f0;
    --color-primary: #87ceeb;
    --color-secondary: #aaaaaa;
    --color-border: #333333;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: background-color 0.5s, color 0.5s;
    line-height: 1.6;
    overflow-x: hidden;
    cursor: none;
}

a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.3s;
}

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.03;
    z-index: 0;
}

.bg-grid::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--color-text) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-text) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.particle {
    position: fixed;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
    box-shadow: 0 0 10px var(--color-primary);
}

@keyframes float {
    0% { 
        opacity: 0;
        transform: translateY(100vh) translateX(0) scale(0);
    }
    10% { 
        opacity: 0.7;
        transform: translateY(90vh) translateX(20px) scale(1);
    }
    50% {
        opacity: 1;
        transform: translateY(50vh) translateX(-30px) scale(1.2);
    }
    90% { 
        opacity: 0.5;
        transform: translateY(10vh) translateX(40px) scale(0.8);
    }
    100% {
        opacity: 0;
        transform: translateY(-10vh) translateX(0) scale(0);
    }
}

#custom-cursor {
    position: fixed;
    width: 15px;
    height: 15px;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.1s ease-out, width 0.3s ease, height 0.3s ease,
        background-color 0.3s ease;
    opacity: 0;
}

body.loaded #custom-cursor {
    opacity: 1;
}

#custom-cursor.expanded {
    width: 40px;
    height: 40px;
    background-color: var(--color-primary);
    mix-blend-mode: difference;
    border-color: transparent;
}

#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg);
    color: var(--color-text);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    transition: opacity 0.8s ease-in-out, visibility 0.8s ease-in-out;
}

body.loading main,
body.loading header {
    opacity: 0;
}

.loaded #preloader {
    opacity: 0;
    visibility: hidden;
}

.loader-text {
    font-size: clamp(2rem, 8vw, 6rem);
    font-weight: 700;
    display: flex;
}

.loader-text span {
    opacity: 0;
    animation: fadeInSlideUp 0.6s forwards;
    transform: translateY(20px);
}

.loader-text span:nth-child(1) { animation-delay: 0.1s; }
.loader-text span:nth-child(2) { animation-delay: 0.2s; }
.loader-text span:nth-child(3) { animation-delay: 0.3s; }
.loader-text span:nth-child(4) { animation-delay: 0.4s; }
.loader-text span:nth-child(5) { animation-delay: 0.5s; }
.loader-text span:nth-child(6) { animation-delay: 0.6s; }
.loader-text span:nth-child(7) { animation-delay: 0.7s; }
.loader-text span:nth-child(8) { animation-delay: 0.8s; }
.loader-text span:nth-child(9) { animation-delay: 0.9s; }

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

.full-screen-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 100px 5vw;
    position: relative;
    z-index: 2;
}

.section-padding {
    padding: 100px 5vw;
    position: relative;
    z-index: 2;
}

.text-large {
    font-size: clamp(3rem, 10vw, 10rem);
    line-height: 0.9;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtext {
    font-size: clamp(1rem, 2vw, 1.5rem);
    max-width: 600px;
    margin-top: 20px;
    font-weight: 300;
}

.section-title {
    font-size: clamp(2rem, 5vw, 4rem);
    margin-bottom: 50px;
    font-weight: 500;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--color-primary);
    transition: width 0.8s cubic-bezier(0.17, 0.84, 0.44, 1);
}

.section-title.active::after {
    width: 100%;
}

.section-description {
    font-size: clamp(1rem, 2vw, 1.2rem);
    max-width: 700px;
    margin-bottom: 50px;
    opacity: 0.8;
}

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 20px 5vw;
    backdrop-filter: blur(10px);
    background: rgba(248, 248, 248, 0.7);
    transition: background 0.3s;
}

body.dark-mode .main-header {
    background: rgba(26, 26, 26, 0.7);
}

.main-header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.main-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
}

.nav-link:hover::before {
    transform: translateX(0);
}

#theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: 8px 12px;
    border-radius: 4px;
    cursor: none;
    font-size: 1rem;
    line-height: 1;
    transition: all 0.3s;
}

#theme-toggle:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    transform: rotate(180deg);
}

.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.project-card {
    border: 1px solid var(--color-border);
    padding: 20px;
    border-radius: 8px;
    cursor: none;
    transition: all 0.5s cubic-bezier(0.17, 0.84, 0.44, 1);
    transform-style: preserve-3d;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(95, 158, 160, 0.1), transparent);
    transition: left 0.5s;
}

.project-card:hover::before {
    left: 100%;
}

.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: var(--color-primary);
}

.project-card img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 15px;
    transition: transform 0.5s ease;
}

.project-card:hover img {
    transform: scale(1.05);
}

.project-info h3 {
    margin-bottom: 5px;
    font-weight: 700;
    position: relative;
}

.view-link {
    display: inline-block;
    margin-top: 10px;
    font-weight: 500;
    text-decoration: underline;
    position: relative;
}

.view-link::after {
    content: '→';
    margin-left: 5px;
    display: inline-block;
    transition: transform 0.3s;
}

.view-link:hover::after {
    transform: translateX(5px);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.article-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.17, 0.84, 0.44, 1);
    cursor: none;
    position: relative;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: var(--color-primary);
}

.article-image {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.article-card:hover .article-image img {
    transform: scale(1.1);
}

.article-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--color-primary);
    color: var(--color-bg);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-content {
    padding: 25px;
}

.article-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    font-size: 0.9rem;
    color: var(--color-secondary);
}

.article-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
    color: var(--color-text);
}

.article-excerpt {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 20px;
    opacity: 0.85;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.tag {
    background: var(--color-border);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s;
}

body.dark-mode .tag {
    background: rgba(255, 255, 255, 0.1);
}

.article-card:hover .tag {
    background: var(--color-primary);
    color: var(--color-bg);
}

.article-link {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
}

.article-link:hover {
    transform: translateX(5px);
}

.view-all-articles {
    text-align: center;
    margin-top: 40px;
}

.about-text {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    max-width: 800px;
    margin-bottom: 30px;
    line-height: 1.8;
}

.skills-list {
    list-style: none;
    max-width: 800px;
}

.skills-list li {
    font-size: clamp(1rem, 2vw, 1.2rem);
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
    position: relative;
    padding-left: 30px;
}

.skills-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-size: 1.5rem;
}

.contact-subtext {
    font-size: clamp(1.2rem, 3vw, 2rem);
    max-width: 700px;
    margin-bottom: 40px;
}

.contact-links {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-block;
    padding: 12px 25px;
    border: 2px solid var(--color-text);
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--color-text);
    transition: width 0.4s ease, height 0.4s ease;
    transform: translate(-50%, -50%);
    z-index: -1;
}

.cta-button:hover::before {
    width: 300px;
    height: 300px;
}

.cta-button:hover {
    color: var(--color-bg);
    border-color: var(--color-text);
}

.social-link {
    font-weight: 500;
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: all 0.3s;
}

.social-link:hover {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-bg);
    transform: translateY(-2px);
}

.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 1s cubic-bezier(0.17, 0.84, 0.44, 1),
        transform 1s cubic-bezier(0.17, 0.84, 0.44, 1);
}

.reveal-item {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.17, 0.84, 0.44, 1),
        transform 0.8s cubic-bezier(0.17, 0.84, 0.44, 1);
}

.reveal-item:nth-child(1) { transition-delay: 0.1s; }
.reveal-item:nth-child(2) { transition-delay: 0.2s; }
.reveal-item:nth-child(3) { transition-delay: 0.3s; }
.reveal-item:nth-child(4) { transition-delay: 0.4s; }

.reveal.active,
.reveal-item.active {
    opacity: 1;
    transform: translateY(0);
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    z-index: 101;
    transition: width 0.1s ease;
}

@media (max-width: 768px) {
    .main-header nav {
        flex-direction: column;
        align-items: flex-start;
    }
    .nav-links {
        margin-top: 10px;
        gap: 15px;
        flex-wrap: wrap;
    }
    .full-screen-section {
        min-height: 80vh;
        padding: 80px 5vw;
    }
    .contact-links {
        flex-direction: column;
        align-items: flex-start;
    }
    #custom-cursor {
        display: none;
    }
    body {
        cursor: default;
    }
    .bg-grid {
        display: none;
    }
    .articles-grid {
        grid-template-columns: 1fr;
    }
}