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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated background bubbles */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bubble {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.bubble:nth-child(1) { width: 80px; height: 80px; left: 10%; animation-delay: 0s; }
.bubble:nth-child(2) { width: 120px; height: 120px; left: 20%; animation-delay: 2s; }
.bubble:nth-child(3) { width: 60px; height: 60px; left: 35%; animation-delay: 4s; }
.bubble:nth-child(4) { width: 100px; height: 100px; left: 50%; animation-delay: 1s; }
.bubble:nth-child(5) { width: 90px; height: 90px; left: 70%; animation-delay: 3s; }
.bubble:nth-child(6) { width: 110px; height: 110px; left: 85%; animation-delay: 5s; }

@keyframes float {
    0%, 100% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10%, 90% { opacity: 1; }
    50% { transform: translateY(-100px) rotate(180deg); }
}

/* Glass morphism container */
.glass-container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    margin: 20px auto;
    padding: 30px;
    max-width: 1200px;
}

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 30px;
}

.logo {
    font-size: 2.5rem;
    font-weight: bold;
    color: white;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    padding: 12px 25px;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.nav-btn.active {
    background: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

/* Page content */
.page {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-title {
    font-size: 3rem;
    color: white;
    text-align: center;
    margin-bottom: 40px;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.5);
}

.content-section {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 20px;
}

/* Background container */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1; /* stays behind everything */
}

/* Bubble style */
.bubble {
    position: absolute;
    bottom: -150px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    animation: rise 20s infinite ease-in;
}

/* Add 3D/glass-like effect */
.three-d {
    backdrop-filter: blur(5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.3);
}

/* Floating upward animation */
@keyframes rise {
    0% {
        transform: translateY(0) scale(1);
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateY(-1200px) scale(1.5);
        opacity: 0;
    }
}

/* Different sizes & speeds for each bubble */
.bubble:nth-child(1) {
    width: 40px; height: 40px;
    left: 10%; animation-duration: 18s; animation-delay: 0s;
}
.bubble:nth-child(2) {
    width: 60px; height: 60px;
    left: 25%; animation-duration: 22s; animation-delay: 2s;
}
.bubble:nth-child(3) {
    width: 30px; height: 30px;
    left: 40%; animation-duration: 16s; animation-delay: 4s;
}
.bubble:nth-child(4) {
    width: 80px; height: 80px;
    left: 55%; animation-duration: 25s; animation-delay: 1s;
}
.bubble:nth-child(5) {
    width: 50px; height: 50px;
    left: 70%; animation-duration: 20s; animation-delay: 3s;
}
.bubble:nth-child(6) {
    width: 100px; height: 100px;
    left: 85%; animation-duration: 28s; animation-delay: 5s;
}

.about-content {
    color: white;
    text-align: justify;
    max-width: 1000px;
    margin: auto;
    line-height: 1.8;
    column-count: 2;          /* 🔥 Creates two columns */
    column-gap: 40px;         /* Space between columns */
}

.about-content p {
    margin-bottom: 15px;
}