:root {
    --bg-color: #050505;
    --text-main: #ffffff;
    --text-muted: #a0a0a0;
    --accent-1: #00f2fe;
    --accent-2: #4facfe;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Background effects */
.glow-bg {
    position: fixed;
    top: -20%;
    left: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(79, 172, 254, 0.15) 0%, rgba(0, 242, 254, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

/* Typography */
.text-gradient {
    background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 5%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.logo-img {
    width: 38px;
    height: 38px;
    object-fit: contain;
    filter: drop-shadow(0 2px 8px rgba(0, 242, 254, 0.2));
}

/* Buttons */
.btn-outline {
    text-decoration: none;
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    transition: all 0.3s ease;
    background: var(--glass-bg);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-primary {
    display: block;
    width: 100%;
    padding: 1.2rem;
    margin-top: 2rem;
    border: none;
    border-radius: 12px;
    background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    color: #000;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(79, 172, 254, 0.3);
}

/* Hero */
.hero {
    text-align: center;
    padding: 4rem 1rem 2rem;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 5rem);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Calculator Section */
.calculator-section {
    display: flex;
    justify-content: center;
    padding: 2rem 1rem 5rem;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem;
    width: 100%;
    max-width: 700px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.glass-card h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
}

.input-group {
    margin-bottom: 2rem;
}

.input-group label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-weight: 300;
    color: var(--text-muted);
}

.input-group label span {
    color: var(--text-main);
    font-weight: 600;
    font-size: 1.2rem;
}

/* Sliders */
input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: var(--accent-1);
    cursor: pointer;
    margin-top: -8px;
    box-shadow: 0 0 10px var(--accent-1);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: var(--glass-border);
    border-radius: 2px;
}

/* Select */
.custom-select select {
    width: 100%;
    padding: 1rem;
    background: rgba(0,0,0,0.5);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    border-radius: 12px;
    font-size: 1rem;
    outline: none;
    cursor: pointer;
    appearance: none;
}

.custom-select select:focus {
    border-color: var(--accent-2);
}

/* Results */
.divider {
    height: 1px;
    background: var(--glass-border);
    margin: 2rem 0;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.result-label {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 600;
}

.highlight .result-value {
    font-size: 2.5rem;
    font-weight: 800;
}

.save .result-value {
    color: #4ade80;
}

/* Info text box */
.info-text-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 1.2rem;
    margin-top: 1.5rem;
}

.info-text {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-muted);
    font-weight: 300;
}

.info-text strong {
    color: var(--text-main);
    font-weight: 600;
}

/* Modal Overlay and Content Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 460px;
    padding: 2.5rem;
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 1.2rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--text-main);
}

.modal-content h3 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.modal-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.4;
    margin-bottom: 2rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: left;
}

.form-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input {
    padding: 1rem 1.2rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: all 0.2s ease;
}

.form-group input:focus {
    border-color: var(--accent-1);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.15);
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(1); opacity: 0.7; }
}