:root {
    /* Measurements */
    --container-width: 600px;
    --header-height: 70px;

    /* Colors - Light Mode */
    --bg-body: #F7F7F7;
    --bg-card: #FFFFFF;
    --text-primary: #111111;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: #EAEAEA;
    --accent-color: #111111;
    --accent-inverse: #FFFFFF;

    /* Icons */
    --icon-bg-purple: #F3F0FF;
    --icon-fg-purple: #7C3AED;
    --icon-bg-blue: #EFF6FF;
    --icon-fg-blue: #2563EB;
    --icon-bg-orange: #FFF7ED;
    --icon-fg-orange: #EA580C;
    --icon-bg-green: #F0FDF4;
    --icon-fg-green: #16A34A;
}

[data-theme="dark"] {
    --bg-body: #111111;
    --bg-card: #1A1A1A;
    --text-primary: #FFFFFF;
    --text-secondary: #AAAAAA;
    --text-tertiary: #666666;
    --border-color: #333333;
    --accent-color: #FFFFFF;
    --accent-inverse: #111111;

    /* Icons Dark */
    --icon-bg-purple: #2E1065;
    --icon-fg-purple: #A78BFA;
    --icon-bg-blue: #172554;
    --icon-fg-blue: #60A5FA;
    --icon-bg-orange: #431407;
    --icon-fg-orange: #FB923C;
    --icon-bg-green: #052E16;
    --icon-fg-green: #4ADE80;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    position: relative;
}

/* Header */
.header {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    z-index: 100;
    max-width: 90%;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-card);
    padding: 8px 12px;
    border-radius: 100px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

.nav-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    border-radius: 50%;
    transition: all 0.2s ease;
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-item:hover,
.nav-item.active {
    color: var(--text-primary);
    background-color: var(--bg-body);
}

.nav-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 4px;
}

.hire-btn {
    background-color: var(--accent-color);
    color: var(--accent-inverse);
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.2s;
}

.hire-btn:hover {
    opacity: 0.9;
}

/* Main Layout */
.main-content {
    padding-top: 100px;
}

/* Hero */
.hero-section {
    text-align: center;
    margin-bottom: 60px;
    padding: 20px 0;
}

.profile-block {
    margin-bottom: 24px;
    position: relative;
    display: inline-block;
}

.profile-img {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--bg-card);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.status-badge {
    position: absolute;
    bottom: 0;
    right: -10px;
    background: #10B981;
    color: white;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 100px;
    border: 3px solid var(--bg-card);
}

.hero-title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 20px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.hero-meta {
    color: var(--text-tertiary);
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s ease, opacity 0.2s ease;
    border: none;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

/* Content Blocks */
.content-block {
    margin-bottom: 48px;
}

.section-header {
    margin-bottom: 24px;
    padding-left: 8px;
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 6px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Project Lists */
.project-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.project-card {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, border-color 0.2s ease;
    cursor: default;
}

.project-card:hover {
    transform: translateY(-2px);
    border-color: var(--text-tertiary);
}

.project-card.compact {
    padding: 12px 16px;
}

.project-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 16px;
    flex-shrink: 0;
}

.project-info {
    flex: 1;
}

.project-name {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 2px;
}

.project-category {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.project-action {
    color: var(--text-tertiary);
    margin-left: 12px;
}

/* Icon Colors */
.icon-purple {
    background: var(--icon-bg-purple);
    color: var(--icon-fg-purple);
}

.icon-blue {
    background: var(--icon-bg-blue);
    color: var(--icon-fg-blue);
}

.icon-orange {
    background: var(--icon-bg-orange);
    color: var(--icon-fg-orange);
}

.icon-green {
    background: var(--icon-bg-green);
    color: var(--icon-fg-green);
}

/* About Block */
.about-card {
    background: var(--bg-card);
    padding: 32px;
    border-radius: 24px;
    border: 1px solid var(--border-color);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 15px;
}

.about-focus {
    margin-top: 32px;
    background: var(--bg-body);
    padding: 24px;
    border-radius: 16px;
}

.about-focus h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    letter-spacing: 0.05em;
}

.about-focus ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.about-focus li {
    font-size: 14px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.about-focus li::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-color);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 80px;
    padding-bottom: 40px;
}

.footer-cta {
    margin-bottom: 48px;
}

.footer-cta h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
}

.footer-cta p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 16px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.social-link {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    transition: all 0.2s;
}

.social-link:hover {
    background: var(--text-primary);
    color: var(--bg-card);
}

.copyright {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* Project Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 24px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    padding: 40px;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--border-color);
    transform: rotate(90deg);
}

.modal-header {
    margin-bottom: 32px;
}

.modal-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.modal-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.modal-section h3 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.modal-section p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

.modal-details {
    margin-bottom: 16px;
}

.modal-tech {
    font-family: 'Inter', monospace;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-body);
    padding: 12px 16px;
    border-radius: 8px;
}

.modal-impact {
    font-weight: 600;
    color: var(--text-primary);
}

/* Enhanced Project Cards */
.project-card.clickable {
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card.clickable:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.project-card.clickable:active {
    transform: translateY(-2px);
}

.project-card.clickable .project-action {
    transition: transform 0.2s ease;
}

.project-card.clickable:hover .project-action {
    transform: translateX(4px);
}

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

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

/* Scroll Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Smooth Scroll */
html {
    scroll-padding-top: 100px;
}

/* Loading State */
body.loading {
    overflow: hidden;
}

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-body);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

/* Responsive */
@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .modal-content {
        padding: 24px;
    }

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

    .nav {
        padding: 6px 10px;
    }

    .nav-item {
        width: 36px;
        height: 36px;
    }
}