:root {
    --color-primary: #00bcd4;
    --color-secondary: #00796b;
    --color-dark: #212529;
    --color-white: #ffffff;
    --color-light-gray: #f8f9fa;
    --color-glass: rgba(255, 255, 255, 0.4);
    --color-glass-dark: rgba(255, 255, 255, 0.2);
    --background-color: #e0f7fa;
    --shadow-glass: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border-glass: 1px solid rgba(255, 255, 255, 0.7);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--color-dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 5rem;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: var(--color-primary);
    border-radius: 50%;
    top: -200px;
    right: -250px;
    z-index: -1;
    filter: blur(180px);
    opacity: 0.6;
    animation: floatShape 25s ease-in-out infinite;
}

@keyframes floatShape {
    0%, 100% { transform: translate(0, 0) scale(1.0); }
    50% { transform: translate(-50px, 50px) scale(1.1); }
}

.glass-container {
    background: var(--color-glass);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 16px;
    border: var(--border-glass);
    box-shadow: var(--shadow-glass);
    padding: 2.5rem;
    max-width: 500px;
    width: 90%;
    margin-top: 4rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.glass-container:hover {
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.section-heading {
    font-weight: 700;
    color: var(--color-dark);
    text-shadow: none;
}

.section-subheading {
    color: var(--color-secondary);
    font-weight: 400;
}

.form-control-glass {
    background: var(--color-glass-dark);
    border: var(--border-glass);
    color: var(--color-dark);
    padding: 1rem;
}
.form-control-glass::placeholder {
    color: rgba(33, 37, 41, 0.6);
}

.form-control-glass:focus {
    background: rgba(255, 255, 255, 0.6);
    box-shadow: 0 0 0 0.25rem rgba(0, 188, 212, 0.4);
    color: var(--color-dark);
    border-color: var(--color-primary);
}

.btn-tool-primary {
    background-color: var(--color-secondary);
    border: none;
    color: var(--color-white);
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
.btn-tool-primary:hover {
    background-color: #004d40;
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

#result-card {
    background: var(--color-white);
    backdrop-filter: none;
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--color-dark);
}

.navbar-tool {
    background: var(--color-white);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 0.5rem 1rem;
}

.btn-navbar-back {
    background-color: var(--color-primary);
    border: none;
    color: var(--color-white);
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    transition: background-color 0.3s ease;
}
.btn-navbar-back:hover {
    background-color: #00a0b2;
    border-color: #00a0b2;
    color: var(--color-white);
}

.icon-massive {
    color: var(--color-primary) !important;
    text-shadow: none !important;
}

#error-alert {
    background: #ff7043;
    border-color: #e64a19;
    color: var(--color-white);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    backdrop-filter: none;
}