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

:root {
    --primary-color: #1e90ff;
    --secondary-color: #0066cc;
    --dark-bg: #1a1a1a;
    --darker-bg: #0f0f0f;
    --light-text: #ffffff;
    --gray-text: #b0b0b0;
    --sidebar-width: 280px;
    --transition-speed: 0.3s;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--darker-bg);
    color: var(--light-text);
    overflow-x: hidden;
}

/* Side Navigation */
.sidenav {
    height: 100vh;
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    background: linear-gradient(180deg, var(--dark-bg) 0%, var(--darker-bg) 100%);
    padding-top: 60px;
    transition: transform var(--transition-speed) ease;
    z-index: 1000;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.5);
}

.sidenav.closed {
    transform: translateX(-100%);
}

.logo {
    text-align: center;
    padding: 0 20px 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo h1 {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.logo p {
    font-size: 12px;
    color: var(--gray-text);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.nav-links {
    list-style: none;
    padding: 20px 0;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    display: flex;
    align-items: center;
    padding: 18px 30px;
    color: var(--gray-text);
    text-decoration: none;
    transition: all var(--transition-speed);
    border-left: 3px solid transparent;
    font-size: 16px;
}

.nav-links a:hover,
.nav-links a.active {
    background-color: rgba(30, 144, 255, 0.1);
    color: var(--light-text);
    border-left-color: var(--primary-color);
}

.nav-links a i {
    margin-right: 15px;
    font-size: 20px;
    color: var(--light-text);
}

/* Hamburger Menu */
.menu-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1001;
    background-color: var(--primary-color);
    border: none;
    color: white;
    width: 45px;
    height: 45px;
    border-radius: 8px;
    cursor: pointer;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    transition: all var(--transition-speed);
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: white;
    transition: all var(--transition-speed);
    border-radius: 2px;
    transform-origin: center;
}

/* Centered, drift-free X state */
.menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    transition: margin-left var(--transition-speed) ease;
    min-height: 100vh;
}

.main-content.expanded {
    margin-left: 0;
}

/* Video Slider */
.slider-container {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.slider-wrapper {
    display: flex;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide {
    min-width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.7);
}

.slide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 10;
    width: 90%;
    max-width: 800px;
}

.slide-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--light-text);
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.8);
    animation: fadeInUp 0.8s ease;
}

.slide-content p {
    font-size: 20px;
    color: var(--gray-text);
    margin-bottom: 30px;
    text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.8);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.slide-content .btn {
    display: inline-block;
    padding: 15px 40px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    transition: all var(--transition-speed);
    animation: fadeInUp 0.8s ease 0.4s backwards;
    box-shadow: 0 5px 15px rgba(30, 144, 255, 0.4);
}

.slide-content .btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(30, 144, 255, 0.6);
}

/* Slider Controls */
.slider-controls {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    z-index: 20;
}

.slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all var(--transition-speed);
    border: 2px solid transparent;
}

.slider-dot.active {
    background-color: var(--primary-color);
    transform: scale(1.3);
    border-color: white;
}

.slider-dot:hover {
    background-color: rgba(255, 255, 255, 0.8);
}

/* Arrow Navigation */
.slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(30, 144, 255, 0.8);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
    z-index: 20;
}

.slider-arrow:hover {
    background-color: var(--primary-color);
    transform: translateY(-50%) scale(1.1);
}

.slider-arrow.prev {
    left: 30px;
}

.slider-arrow.next {
    right: 30px;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .sidenav {
        width: 100%;
        transform: translateX(-100%);
    }

    .sidenav.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .slide-content h2 {
        font-size: 32px;
    }

    .slide-content p {
        font-size: 16px;
    }

    .slide-content .btn {
        padding: 12px 30px;
        font-size: 16px;
    }

    .slider-arrow {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    .slider-arrow.prev {
        left: 15px;
    }

    .slider-arrow.next {
        right: 15px;
    }

    :root {
        --sidebar-width: 280px;
    }
}

@media (max-width: 480px) {
    .slide-content h2 {
        font-size: 24px;
    }

    .slide-content p {
        font-size: 14px;
    }

    .logo h1 {
        font-size: 20px;
    }

    .nav-links a {
        padding: 15px 20px;
        font-size: 14px;
    }
}

/* Overlay for mobile */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.overlay.active {
    display: block;
    opacity: 1;
}