/* ====== Base Styles ====== */
:root {
    --primary: #0891B2;
    --primary-dark: #155E75;
    --primary-light: #22D3EE;
    --secondary: #155E75;
    --dark: #082F49;
    --light: #F0F9FF;
    --gray: #64748B;
    --danger: #DC2626;
    --success: #059669;
    --warning: #D97706;
    --transition: all 0.3s ease;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Open Sans', sans-serif;
    color: #333;
    overflow-x: hidden;
    background-color: #fff;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
}

section {
    position: relative;
    padding: 80px 0;
}

.section-title {
    font-weight: 700;
    position: relative;
    margin-bottom: 15px;
    color: var(--dark);
}

.section-divider {
    height: 4px;
    width: 70px;
    background: var(--primary);
    margin: 0 auto 40px;
    border-radius: 2px;
}

.btn {
    border-radius: 50px;
    padding: 12px 25px;
    font-weight: 500;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 14px;
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 4px 15px rgba(8, 145, 178, 0.3);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(8, 145, 178, 0.4);
}

.btn-lg {
    padding: 14px 30px;
    font-size: 16px;
}

/* ====== Particles Background ====== */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    background: linear-gradient(135deg, #0C4A6E, #082F49);
}

/* ====== Navbar ====== */
.navbar {
    padding: 20px 0;
    transition: var(--transition);
    z-index: 1000;
}

.navbar.scrolled {
    background-color: rgba(8, 47, 73, 0.9);
    padding: 10px 0;
    box-shadow: var(--shadow);
}

.navbar-brand {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 24px;
    color: var(--light) !important;
}

.wave-icon {
    animation: waveAnimation 2s infinite;
    display: inline-block;
}

@keyframes waveAnimation {
    0% { transform: rotate(0deg); }
    25% { transform: rotate(-10deg); }
    50% { transform: rotate(0deg); }
    75% { transform: rotate(10deg); }
    100% { transform: rotate(0deg); }
}

/* Unique Nav styling */
.custom-nav {
    display: flex;
    gap: 15px;
}

.custom-nav .nav-item {
    position: relative;
}

.custom-nav .nav-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 15px;
    color: var(--light) !important;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.custom-nav .nav-icon {
    font-size: 1.2rem;
    margin-bottom: 3px;
    transition: all 0.3s ease;
}

.custom-nav .nav-text {
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.8;
}

.custom-nav .nav-link:hover,
.custom-nav .nav-link.active {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.custom-nav .nav-link:hover .nav-icon,
.custom-nav .nav-link.active .nav-icon {
    color: var(--primary-light);
    transform: scale(1.2);
}

.custom-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-light);
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.custom-nav .nav-link:hover::after,
.custom-nav .nav-link.active::after {
    width: 50%;
}

/* ====== Hero Section ====== */
.hero {
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background-color: transparent;
    padding-bottom: 100px;
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero .lead {
    font-size: 18px;
    margin-bottom: 30px;
}

.hero-image {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-img {
    max-width: 90%;
    box-shadow: var(--shadow-lg);
    border: 5px solid rgba(255, 255, 255, 0.2);
    animation: float 6s ease-in-out infinite;
}

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

.wave {
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    z-index: 2;
}

/* ====== About Section ====== */
.about {
    background-color: #fff;
}

.feature-card {
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    height: 100%;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(8, 145, 178, 0.1);
    border-radius: 50%;
}

.icon-wrapper i {
    font-size: 36px;
}

.feature-card h4 {
    margin-bottom: 15px;
    color: var(--dark);
}

.img-wrapper {
    border-radius: 15px;
    overflow: hidden;
}

.floating-badge {
    position: absolute;
    top: 20px;
    right: -15px;
    background: var(--primary);
    color: white;
    padding: 10px 20px;
    border-radius: 30px;
    box-shadow: var(--shadow);
    font-weight: 600;
}

.parameters-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.parameter {
    background-color: rgba(8, 145, 178, 0.1);
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    font-weight: 500;
    transition: var(--transition);
}

.parameter:hover {
    background-color: var(--primary);
    color: white;
    transform: scale(1.05);
}

/* ====== Water Test Section ====== */
.water-test {
    background-color: #f9f9f9;
    position: relative;
    overflow: hidden;
}

.test-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://source.unsplash.com/1600x900/?water,pattern') no-repeat center center;
    background-size: cover;
    opacity: 0.05;
    z-index: 0;
}

.test-card {
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    position: relative;
    z-index: 1;
}

.form-floating .form-control {
    border-radius: 10px;
    height: 60px;
    border: 2px solid #e1e1e1;
}

.form-floating .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(8, 145, 178, 0.25);
}

.result-box {
    background: white;
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid #e9e9e9;
}

.result-header {
    padding: 15px 25px;
    background: var(--primary);
    color: white;
}

.result-body {
    padding: 25px;
}

.gauge-container {
    padding: 20px 0;
}

.gauge {
    width: 150px;
    height: 75px;
    border-radius: 75px 75px 0 0;
    background-color: #e0e0e0;
    position: relative;
    overflow: hidden;
    margin: 0 auto;
}

.gauge-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0%;
    background: linear-gradient(to top, var(--danger), var(--warning), var(--success));
    transition: height 1s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.gauge-center {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 24px;
    color: #333;
}

.gauge-label {
    margin-top: 10px;
    font-weight: 600;
    color: var(--gray);
}

.result-info {
    padding: 0 20px;
}

#result-status {
    margin-bottom: 15px;
    font-weight: 700;
}

#result-status.safe {
    color: var(--success);
}

#result-status.unsafe {
    color: var(--danger);
}

#recommendations-list li {
    margin-bottom: 8px;
}

/* ====== Contact Section ====== */
.contact {
    background-color: white;
}

.contact-info {
    text-align: center;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    height: 100%;
    background-color: #fff;
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.contact-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.05), rgba(21, 94, 117, 0.1));
    z-index: -1;
}

.profile-img {
    width: 180px;
    height: 180px;
    margin: 0 auto 20px;
    border-radius: 50%;
    overflow: hidden;
    border: 5px solid rgba(8, 145, 178, 0.1);
    position: relative;
}

.profile-img::after {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    border: 2px solid var(--primary-light);
    animation: pulseRing 2s infinite;
}

@keyframes pulseRing {
    0% {
        transform: scale(0.95);
        opacity: 1;
    }
    70% {
        transform: scale(1.1);
        opacity: 0.7;
    }
    100% {
        transform: scale(0.95);
        opacity: 1;
    }
}

.profile-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 25px;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    color: white;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
}

.social-icon:hover {
    transform: translateY(-5px) rotate(10deg);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.facebook {
    background-color: #3b5998;
}

.linkedin {
    background-color: #0077b5;
}

.github {
    background-color: #333;
}

.instagram {
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
}

.student-id {
    background-color: var(--primary-light);
    color: var(--dark);
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: 600;
    display: inline-block;
    margin-top: -5px;
    margin-bottom: 10px;
}

/* ====== Footer ====== */
.footer {
    background-color: var(--dark);
    color: var(--light);
}

/* ====== Responsive Styles ====== */
@media (max-width: 991px) {
    .hero h1 {
        font-size: 42px;
    }
    
    .hero-image {
        margin-top: 50px;
    }
    
    .test-card {
        padding: 30px 20px;
    }
    
    .custom-nav {
        gap: 5px;
    }
    
    .custom-nav .nav-link {
        padding: 8px 10px;
    }
}

@media (max-width: 767px) {
    section {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 36px;
        text-align: center;
    }
    
    .hero .lead {
        text-align: center;
    }
    
    .hero .btn {
        display: block;
        margin: 0 auto;
    }
    
    .feature-card {
        margin-bottom: 30px;
    }
    
    .test-card {
        padding: 25px 15px;
    }
    
    .custom-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .custom-nav .nav-item {
        width: calc(50% - 10px);
    }
    
    .custom-nav .nav-link {
        margin-bottom: 10px;
    }
}

/* ====== Animation Classes ====== */
.fade-in {
    animation: fadeIn 1s ease forwards;
}

.slide-up {
    animation: slideUp 0.8s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translateY(50px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes waterRipple {
    0% {
        box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.5);
    }
    70% {
        box-shadow: 0 0 0 20px rgba(34, 211, 238, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(34, 211, 238, 0);
    }
}