/* ==================== ROOT VARIABLES ==================== */
:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #141925;
    --bg-card: rgba(20, 25, 37, 0.8);
    --bg-card-hover: rgba(30, 35, 50, 0.9);
    
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.3);
    
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    
    --border-color: rgba(99, 102, 241, 0.1);
    --border-hover: rgba(99, 102, 241, 0.3);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.2);
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    --navbar-height: 70px;
    --section-padding: 120px;
}

/* ==================== GLOBAL RESET ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 17px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: var(--accent-primary);
    color: white;
}

/* ==================== LANGUAGE SELECTOR ==================== */
.language-selector {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
}

.language-selector select {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.language-selector select:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.language-selector select:focus {
    border-color: var(--accent-primary);
}

/* ==================== NAVIGATION ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: transparent;
    z-index: 9999;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo .logo-text {
    font-size: 26px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all var(--transition-normal);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 26px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

/* ==================== HERO SECTION ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--navbar-height) 40px 60px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#particleCanvas {
    width: 100%;
    height: 100%;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1400px;
    width: 100%;
}

.hero-text {
    max-width: 900px;
}

.hero-title {
    font-size: 68px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
    animation: fadeInUp 0.8s ease forwards;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-subtitle {
    font-size: 22px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-weight: 400;
    line-height: 1.6;
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.4s forwards;
    opacity: 0;
}

.keyword {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.keyword:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.hero-cta {
    display: flex;
    gap: 20px;
    animation: fadeInUp 0.8s ease 0.6s forwards;
    opacity: 0;
}

/* ==================== BUTTONS ==================== */
.btn {
    padding: 16px 36px;
    font-size: 17px;
    font-weight: 600;
    border-radius: 12px;
    text-decoration: none;
    display: inline-block;
    transition: all var(--transition-normal);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 50px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* ==================== SCROLL INDICATOR ==================== */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, transparent, var(--accent-primary));
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--accent-primary);
    border-bottom: 2px solid var(--accent-primary);
    transform: translateX(-50%) rotate(45deg);
}

/* ==================== SECTIONS ==================== */
.section {
    padding: var(--section-padding) 40px;
    position: relative;
}

.section-dark {
    background: var(--bg-secondary);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    font-size: 52px;
    font-weight: 800;
    margin-bottom: 16px;
    text-align: center;
    letter-spacing: -1px;
}

.section-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 60px;
    font-weight: 400;
}

/* ==================== EXPERTISE SECTION ==================== */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 32px;
}

.expertise-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 36px;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.expertise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

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

.expertise-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.expertise-card > * {
    position: relative;
    z-index: 1;
}

.expertise-icon {
    width: 72px;
    height: 72px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--accent-primary);
    transition: all var(--transition-normal);
}

.expertise-card:hover .expertise-icon {
    background: rgba(99, 102, 241, 0.2);
    transform: scale(1.05);
}

.expertise-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.expertise-card p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.expertise-tags span {
    padding: 6px 14px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-primary);
}

/* ==================== TECH STACK SECTION ==================== */
.tech-categories {
    display: grid;
    gap: 48px;
}

.tech-category h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.tech-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    cursor: pointer;
}

.tech-item:hover {
    transform: translateY(-4px) scale(1.02);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.tech-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.tech-item span {
    display: block;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ==================== TOOLS SECTION ==================== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 36px;
    text-align: center;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    position: relative;
}

.tool-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.tool-status {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-secondary);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tool-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.tool-card p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.6;
}

/* ==================== CONTACT SECTION ==================== */
.contact-content {
    max-width: 1200px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
    margin-bottom: 60px;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

.contact-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.contact-icon {
    width: 64px;
    height: 64px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--accent-primary);
}

.contact-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.contact-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 17px;
    font-weight: 500;
    transition: all var(--transition-fast);
    display: inline-block;
}

.contact-link:hover {
    opacity: 0.8;
    transform: scale(1.02);
}

.contact-note {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
}

.contact-cta {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.contact-cta h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 28px;
    color: var(--text-primary);
}

.document-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.doc-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--accent-primary);
    border-radius: 10px;
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all var(--transition-normal);
}

.doc-link:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* ==================== FOOTER ==================== */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 48px 40px;
}

.footer-content {
    text-align: center;
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 8px;
}

.footer-subtitle {
    color: var(--text-muted);
    font-size: 14px;
}

/* ==================== FLOATING BUTTON ==================== */
.floating-btn {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-glow);
    transition: all var(--transition-normal);
    z-index: 9998;
    text-decoration: none;
}

.floating-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.5);
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 1200px) {
    :root {
        --section-padding: 80px;
    }
    
    .hero-title {
        font-size: 56px;
    }
    
    .section-title {
        font-size: 42px;
    }
}

@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--navbar-height));
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        padding: 40px;
        gap: 28px;
        transition: left var(--transition-normal);
        border-top: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -8px);
    }
    
    .hero-title {
        font-size: 46px;
    }
    
    .hero-subtitle {
        font-size: 19px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .expertise-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
}

@media (max-width: 640px) {
    :root {
        --section-padding: 60px;
    }
    
    .nav-container {
        padding: 0 20px;
    }
    
    .section {
        padding: var(--section-padding) 20px;
    }
    
    .hero {
        padding: var(--navbar-height) 20px 60px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 17px;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .section-subtitle {
        font-size: 17px;
    }
    
    .expertise-card,
    .tool-card {
        padding: 28px;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .document-links {
        flex-direction: column;
    }
    
    .doc-link {
        width: 100%;
        justify-content: center;
    }
    
    .floating-btn {
        width: 52px;
        height: 52px;
        bottom: 20px;
        right: 20px;
    }
    
    .language-selector {
        top: 15px;
        right: 15px;
    }
    
    .language-selector select {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 16px;
    }
    
    .tech-item {
        padding: 18px;
    }
    
    .tech-icon {
        font-size: 32px;
    }
}

/* ==================== PRINT STYLES ==================== */
@media print {
    .navbar,
    .floating-btn,
    .language-selector,
    .scroll-indicator {
        display: none;
    }
}