/* ======== CSS Variables & Reset ======== */
:root {
    --primary-dark: #1C1F26;
    --secondary-dark: #2E333D;
    --accent-blue: #4682B4;
    --accent-cyan: #00D4FF;
    --accent-orange: #E97630;
    --accent-green: #10B981;
    --text-primary: #E0E3E7;
    --text-secondary: #ADB5BD;
    --text-muted: #707680;
    --border-color: #3A3F4E;
    --panel-bg: rgba(46, 51, 61, 0.8);
    --panel-border: rgba(58, 63, 78, 0.5);
    --glass-bg: rgba(46, 51, 61, 0.6);
    --glass-border: rgba(58, 63, 78, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ======== Header ======== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(28, 31, 38, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(28, 31, 38, 0.98);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent-blue);
    text-decoration: none;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.02);
}

.logo-svg {
    width: 70px;
    height: 70px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-cyan);
    transition: width 0.3s ease;
}

.nav-menu a:hover {
    color: var(--text-primary);
}

.nav-menu a:hover::after {
    width: 100%;
}

.cta-nav {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(46, 91, 255, 0.3);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: 0.3s;
}

/* === Logo === */
.logo-container {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-text {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--accent-blue);
    letter-spacing: 0.5px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.02);
}

/* === Mobile menu === */
.mobile-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    right: 2rem;
    background: var(--primary-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    z-index: 999;
    width: 220px;
}

.mobile-menu li {
    list-style: none;
}

.mobile-menu a {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    transition: background 0.3s ease;
    background: var(--secondary-dark);
}

.mobile-menu a:hover {
    background: var(--accent-blue);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    margin-left: 1.5rem;
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* Only show toggle and mobile menu in small screens */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }
}

/* ======== Hero Section ======== */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%234682B4" stroke-width="0.1" opacity="0.2"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.4;
}

.hero-content {
    max-width: 900px;
    z-index: 2;
    position: relative;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 400;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: white;
    padding: 1.2rem 2.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(46, 91, 255, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    padding: 1.2rem 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-secondary:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(0, 229, 255, 0.1);
}

/* ======== Section Headers ======== */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ======== About Section ======== */
.about {
    padding: 8rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.about-card {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 2.5rem;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.about-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-blue);
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-cyan);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ======== Projects Section ======== */
.projects {
    padding: 8rem 2rem;
    background: var(--secondary-dark);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.project-card {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
}

.project-card.featured {
    border: 2px solid var(--accent-blue);
    transform: scale(1.02);
}

.project-card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--accent-cyan);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 2rem 2rem 0;
}

.project-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    flex-shrink: 0;
}

.project-meta h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.project-status {
    background: var(--accent-orange);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-content {
    padding: 1.5rem 2rem;
}

.project-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.project-specs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.spec-item {
    text-align: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 1rem 0.5rem;
}

.spec-value {
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 0.3rem;
}

.spec-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-actions {
    padding: 0 2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.btn-project-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.btn-project-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(46, 91, 255, 0.4);
}

.btn-project-secondary {
    background: transparent;
    color: var(--accent-cyan);
    border: 2px solid var(--accent-cyan);
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.btn-project-secondary:hover {
    background: var(--accent-cyan);
    color: white;
}

.project-tech {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ======== Capabilities Section ======== */
.capabilities {
    padding: 8rem 2rem;
    background: var(--primary-dark);
}

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

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.capability-card {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.capability-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-blue);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.capability-card:hover::before {
    transform: scaleX(1);
}

.capability-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
}

.capability-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-blue);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.5rem;
    color: white;
}

.capability-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

/* ======== Contact Section ======== */
.contact {
    padding: 8rem 2rem;
    background: var(--secondary-dark);
}

.contact-container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.contact-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 2rem;
    backdrop-filter: blur(20px);
}

.contact-item h3 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.contact-item p {
    color: var(--text-secondary);
}

/* ======== Footer ======== */
.footer {
    background: var(--primary-dark);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem 1rem;
    text-align: center;
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent-cyan);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ======== Animations ======== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
}

.fade-in-delay {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 0.3s forwards;
}

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

/* ======== Responsive Design ======== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .about-grid,
    .capabilities-grid {
        grid-template-columns: 1fr;
    }

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

    .project-card.featured {
        transform: none;
    }

    .project-specs {
        grid-template-columns: 1fr;
    }

    .project-actions {
        flex-direction: column;
        align-items: stretch;
    }

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

    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }

    .about,
    .capabilities,
    .contact {
        padding: 4rem 1rem;
    }

    .projects {
        padding: 4rem 1rem;
    }

    .btn-primary,
    .btn-secondary,
    .btn-explore {
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .project-card {
        margin: 0;
    }
}