:root {
    --lagoon-blue: #0077BE;
    --sand-white: #FAF9F6;
    --palm-green: #228B22;
    --biolume-cyan: #00FFEF;
    --dark-bg: #001A2C;
    --transition-speed: 0.5s;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--sand-white);
    color: var(--lagoon-blue);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

/* Night Mode Styles */
body.night-mode {
    background-color: var(--dark-bg);
    color: var(--sand-white);
}

.night-mode .navbar, .night-mode .card, .night-mode .footer {
    background-color: rgba(0, 26, 44, 0.8) !important;
    border-color: var(--biolume-cyan) !important;
    box-shadow: 0 0 15px rgba(0, 255, 239, 0.3);
}

.night-mode .btn-primary, .night-mode .nav-link.active {
    background-color: transparent !important;
    border: 1px solid var(--biolume-cyan) !important;
    color: var(--biolume-cyan) !important;
    text-shadow: 0 0 10px var(--biolume-cyan);
    box-shadow: 0 0 15px var(--biolume-cyan);
}

/* Organic Minimalism & Fluidity */
.glass-morphism {
    background: rgba(250, 249, 246, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
}

.night-mode .glass-morphism {
    background: rgba(0, 26, 44, 0.6);
    border: 1px solid rgba(0, 255, 239, 0.2);
}

.fluid-curve {
    border-radius: 50% 50% 50% 50% / 30% 30% 70% 70%;
}

/* Water Drop Button Effect */
.btn-water {
    position: relative;
    overflow: hidden;
    border-radius: 50px;
    transition: all 0.3s ease;
    border: 1px solid var(--lagoon-blue);
    background: transparent;
    color: var(--lagoon-blue);
}

.btn-water:hover {
    box-shadow: inset 0 0 20px rgba(0, 119, 190, 0.2);
    transform: translateY(-2px);
}

.night-mode .btn-water {
    border-color: var(--biolume-cyan);
    color: var(--biolume-cyan);
}

/* Hero Section */
.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(180deg, var(--lagoon-blue) 0%, var(--sand-white) 100%);
    position: relative;
}

.night-mode .hero-section {
    background: linear-gradient(180deg, #001A2C 0%, #003366 100%);
}

/* Navigation */
.navbar-brand {
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-link {
    margin: 0 15px;
    font-weight: 300;
    transition: color 0.3s;
}

/* Footer */
footer {
    padding: 50px 0;
    border-top: 1px solid rgba(0, 119, 190, 0.1);
}