@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables for Modern Clean Theme */
:root {
    /* Clean Color System */
    --primary-color: #ffffff;
    --secondary-color: #f0f0f0;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    
    /* Background System */
    --bg-overlay: rgba(0, 0, 0, 0.4);
    --bg-glass: rgba(255, 255, 255, 0.1);
    --bg-glass-hover: rgba(255, 255, 255, 0.2);
    --bg-dark: rgba(0, 0, 0, 0.6);
    --bg-light: rgba(255, 255, 255, 0.9);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-muted: #b0b0b0;
    --text-dark: #333333;
    
    /* Interactive Colors */
    --filter-mask-color: rgba(255, 255, 255, 0.1);
    
    /* Design System */
    --border-radius: 8px;
    --border-radius-lg: 16px;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
    position: relative;
}

/* Video Background System */
.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    overflow: hidden;
}

.video-background video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

/* Video overlay and mask system */
.video-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: var(--bg-overlay);
    transition: var(--transition);
}

.color-mask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: var(--filter-mask-color);
    mix-blend-mode: overlay;
    transition: var(--transition);
}

/* Filter system */
.filter-applied {
    filter: none;
    transition: var(--transition);
}

.filter-invert {
    filter: invert(1);
}

.filter-grayscale {
    filter: grayscale(1);
}

.filter-sepia {
    filter: sepia(1);
}

.filter-blur {
    filter: blur(2px);
}

.filter-contrast {
    filter: contrast(1.5);
}

.filter-brightness {
    filter: brightness(1.2);
}

/* Mobile video positioning */
@media (max-width: 768px) {
    .video-background video {
        object-position: left center;
        transform: scale(1.2);
    }
}

/* Page Layout */
.page {
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

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

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-dark);
    backdrop-filter: blur(25px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.nav-brand .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.nav-brand .tagline {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: block;
    margin-top: -4px;
}

.nav-toggle {
    all: unset;
    width: 40px;
    height: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-toggle:hover {
    background: var(--bg-glass-hover);
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    margin: 2px 0;
    transition: var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Side Menu */
.side-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background: var(--bg-dark);
    backdrop-filter: blur(20px);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    z-index: 999;
    display: flex;
    flex-direction: column;
}

.side-menu.active {
    right: 0;
}

.menu-content {
    padding: var(--spacing-2xl) var(--spacing-lg);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.menu-nav {
    margin-top: var(--spacing-xl);
    flex-grow: 1;
}

.menu-link {
    display: block;
    padding: var(--spacing-md) 0;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.1rem;
    transition: var(--transition);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
}

.menu-link:hover,
.menu-link.active {
    color: var(--text-primary);
    padding-left: var(--spacing-md);
}

.menu-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 2px;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    position: relative;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 10;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--bg-glass-hover);
    transform: translateY(-2px);
}

.btn-outline {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
}

.btn-outline:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

/* Control Panel - Toggleable */
.control-panel {
    position: fixed;
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
    z-index: 100;
    background: var(--bg-dark);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    transform: translateX(-100%);
    transition: var(--transition);
    opacity: 0;
    pointer-events: none;
}

.control-panel.active {
    transform: translateX(0);
    opacity: 1;
    pointer-events: all;
}

/* Control Panel Toggle Button */
.control-toggle {
    position: fixed;
    bottom: calc(var(--spacing-lg) + 10px);
    left: var(--spacing-xs);
    z-index: 101;
    background: var(--bg-dark);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
    font-size: 1.2rem;
}

.control-toggle:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    transform: scale(1.1);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.control-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.control-buttons {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.control-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    background: var(--bg-glass);
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.control-btn:hover,
.control-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.color-picker {
    appearance: none;
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    width: 40px;
    height: 30px;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Content Sections */
.content-section {
    padding: calc(80px + var(--spacing-lg)) 0 var(--spacing-2xl);
    position: relative;
    z-index: 10;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.section-content {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

/* Projects Grid - Masonry Style */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.project-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    overflow: visible;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(255, 255, 255, 0.2);
    z-index: 100;
}

.project-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

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

.project-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    position: relative;
    overflow: visible;
}

.tech-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border: 1px solid;
    transition: var(--transition);
    position: relative;
    cursor: pointer;
}

/* Tooltip popup element */
.tooltip-popup {
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: #000000;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-size: 0.75rem;
    white-space: nowrap;
    z-index: 999999;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease-in-out, visibility 0.2s ease-in-out;
    color: #ffffff;
    animation: textGlow 3s ease-in-out infinite;
}

@keyframes textGlow {
    0%, 100% {
        text-shadow: 0 0 5px rgba(255, 255, 255, 0.3);
    }
    50% {
        text-shadow: 0 0 20px rgba(255, 255, 255, 0.8),
                     0 0 30px rgba(255, 255, 255, 0.6);
    }
}

.tooltip-popup::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: #000000;
}

.tech-tag:hover .tooltip-popup {
    opacity: 1;
    visibility: visible;
}


/* Tooltip styling */
.tech-tag[data-tooltip]:not([data-tooltip=""]):hover::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.95);
    color: #ffffff;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 400;
    white-space: nowrap;
    z-index: 10000;
    pointer-events: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    animation: tooltipFadeIn 0.2s ease-in-out;
}

/* Tooltip arrow */
.tech-tag[data-tooltip]:not([data-tooltip=""]):hover::after {
    content: '';
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.95);
    z-index: 10000;
    pointer-events: none;
    animation: tooltipFadeIn 0.2s ease-in-out;
}

@keyframes tooltipFadeIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Different colors for tech tags for better readability */
.tech-tag:nth-child(1) { background: rgba(255, 99, 71, 0.2); color: #ff6347; border-color: rgba(255, 99, 71, 0.4); }
.tech-tag:nth-child(2) { background: rgba(50, 205, 50, 0.2); color: #32cd32; border-color: rgba(50, 205, 50, 0.4); }
.tech-tag:nth-child(3) { background: rgba(255, 165, 0, 0.2); color: #ffa500; border-color: rgba(255, 165, 0, 0.4); }
.tech-tag:nth-child(4) { background: rgba(138, 43, 226, 0.2); color: #8a2be2; border-color: rgba(138, 43, 226, 0.4); }
.tech-tag:nth-child(5) { background: rgba(255, 20, 147, 0.2); color: #ff1493; border-color: rgba(255, 20, 147, 0.4); }
.tech-tag:nth-child(6) { background: rgba(0, 191, 255, 0.2); color: #00bfff; border-color: rgba(0, 191, 255, 0.4); }
.tech-tag:nth-child(7) { background: rgba(255, 215, 0, 0.2); color: #ffd700; border-color: rgba(255, 215, 0, 0.4); }
.tech-tag:nth-child(8) { background: rgba(127, 255, 212, 0.2); color: #7fffd4; border-color: rgba(127, 255, 212, 0.4); }

.tech-tag:hover {
    transform: scale(1.05) translateY(-2px);
    opacity: 1;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.project-link {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.project-link:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

/* About Page Styles */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.about-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.about-card h3 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Resume Page Styles */
.resume-section {
    margin-bottom: var(--spacing-2xl);
}

.resume-item {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: var(--transition);
}

.resume-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.resume-item h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.resume-item .meta {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.resume-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .control-panel {
        position: relative;
        bottom: auto;
        left: auto;
        margin: var(--spacing-lg) 0;
    }
}

@media (max-width: 768px) {
    .main-nav {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .hero-section {
        padding: calc(80px + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 2.8rem);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        min-width: 200px;
        justify-content: center;
    }
    
    .projects-grid {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .projects-column {
        gap: var(--spacing-lg);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .content-section {
        padding: calc(70px + var(--spacing-md)) var(--spacing-md) var(--spacing-2xl);
    }
    
    .side-menu {
        width: 280px;
        right: -280px;
    }
    
    .control-panel {
        position: fixed;
        bottom: var(--spacing-sm);
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        transform: translateY(100%);
    }
    
    .control-panel.active {
        transform: translateY(0);
    }
    
    .control-toggle {
        bottom: calc(var(--spacing-sm) + 5px);
        left: var(--spacing-sm);
        transform: none;
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
    
    .control-group {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-xs);
    }
    
    .control-buttons {
        gap: 4px;
    }
    
    .control-btn {
        padding: 4px 8px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-content {
        padding: 0 var(--spacing-sm);
    }
    
    .section-content {
        padding: var(--spacing-lg);
    }
    
    .project-card,
    .about-card,
    .resume-item {
        padding: var(--spacing-md);
    }
    
    .side-menu {
        width: 260px;
        right: -260px;
    }
    
    .control-panel {
        flex-direction: column;
        gap: var(--spacing-xs);
        padding: var(--spacing-sm);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.hidden {
    display: none;
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

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