:root {
    --primary: #00aaff;
    --primary-dark: #0088cc;
    --secondary: #00ccff;
    --dark: #0a0e17;
    --darker: #05090f;
    --light: #f0f8ff;
    --gray: #8a8a8a;
    --overlay: rgba(5, 9, 15, 0.85);
    --bg-video-filter: brightness(0.4) contrast(1.2);
    --card-bg: rgba(10, 14, 23, 0.7);
}

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

body, html {
    height: 100%;
    font-family: 'Segoe UI', 'Roboto', sans-serif;
    color: var(--light);
    background: var(--dark);
    line-height: 1.6;
    transition: background 0.5s ease, color 0.3s ease;
    opacity: 0;
    animation: fadeIn 1s ease-in-out forwards;
}

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

#bg-video {
    position: fixed;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    z-index: -1;
    object-fit: cover;
    transform: translate(-50%, -50%);
    filter: var(--bg-video-filter);
    transition: filter 0.5s ease;
}

body:hover #bg-video {
    filter: brightness(0.3) contrast(1.1);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    animation: slideUpFadeIn 0.8s ease-out forwards 0.3s;
    opacity: 0;
    transform: translateY(20px);
}

@keyframes slideUpFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Nawigacja */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(15px) saturate(180%);
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(0, 170, 255, 0.1);
    animation: slideDown 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards 0.2s;
    transform: translateY(-100%);
}

@keyframes slideDown {
    to { transform: translateY(0); }
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--light);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.nav-brand:hover {
    text-shadow: 0 0 10px rgba(0, 170, 255, 0.5);
}

.nav-brand i {
    color: var(--primary);
    transition: transform 0.3s ease;
}

.nav-brand:hover i {
    transform: scale(1.2);
}

.back-button {
    background: rgba(0, 170, 255, 0.15);
    color: var(--light);
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 170, 255, 0.2);
}

.back-button:hover {
    background: rgba(0, 170, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 170, 255, 0.2);
}

/* Główna zawartość */
main {
    padding-top: 90px;
    min-height: 100vh;
}
button {
    padding: 12px 25px;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--darker);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

button:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 170, 255, 0.3);
}

.hero {
    text-align: center;
    margin-bottom: 30px;
    animation: scaleIn 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) forwards 0.4s;
    transform: scale(0.95);
    opacity: 0;
}

@keyframes scaleIn {
    to {
        transform: scale(1);
        opacity: 1;
    }
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
    text-shadow: 0 0 15px rgba(0, 170, 255, 0.3);
    transition: text-shadow 0.3s ease;
}

h1:hover {
    text-shadow: 0 0 20px rgba(0, 170, 255, 0.5);
}

/* Karta kalkulatora */
.calculator-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(0, 170, 255, 0.1);
    margin-bottom: 30px;
    animation: cardAppear 0.8s ease-in forwards 0.6s;
    transform: translateY(20px);
    opacity: 0;
}

@keyframes cardAppear {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.calculator-card:hover {
    box-shadow: 0 12px 40px rgba(0, 170, 255, 0.3);
    transform: translateY(-5px);
    transition: all 0.3s ease;
}

.form-group {
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.form-group:hover {
    transform: translateX(5px);
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--secondary);
    font-weight: 500;
}

select, input[type="number"], input[type="text"] {
    width: 100%;
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid rgba(0, 170, 255, 0.3);
    background-color: rgba(0, 0, 0, 0.3);
    color: var(--light);
    font-size: 1rem;
    transition: all 0.3s ease;
    appearance: none;
    -moz-appearance: textfield;
}

select:focus, input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0, 170, 255, 0.2),
                0 0 15px rgba(0, 170, 255, 0.1);
}

.price-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 15px 0;
}

.price-btn {
    padding: 10px;
    border: none;
    background: rgba(0, 170, 255, 0.15);
    color: var(--light);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 170, 255, 0.2);
}

.price-btn:hover {
    background: rgba(0, 170, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0, 170, 255, 0.2);
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin: 20px 0;
    transition: transform 0.3s ease;
}

.checkbox-group:hover {
    transform: translateX(5px);
}

.checkbox-group input {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    cursor: pointer;
    accent-color: var(--primary);
}

.calculate-btn {
    width: 100%;
    padding: 14px;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--darker);
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
    position: relative;
    overflow: hidden;
}

.calculate-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.calculate-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 170, 255, 0.3);
}

.calculate-btn:hover::before {
    left: 100%;
}

/* Wyniki */
.result {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid rgba(0, 170, 255, 0.1);
    display: none;
    animation: fadeIn 0.5s ease;
}

.result h2 {
    color: var(--secondary);
    margin-bottom: 15px;
    font-size: 1.5rem;
    text-shadow: 0 0 10px rgba(0, 170, 255, 0.2);
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px dashed rgba(0, 170, 255, 0.2);
    transition: transform 0.3s ease;
}

.result-item:hover {
    transform: translateX(5px);
}

.result-item:last-child {
    border-bottom: none;
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.8; }
    100% { opacity: 1; }
}

/* Stopka */
footer {
    text-align: center;
    padding: 20px;
    color: var(--gray);
    font-size: 0.9rem;
    animation: fadeInUp 0.8s ease-out forwards 0.8s;
    opacity: 0;
    transform: translateY(20px);
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

footer a {
    color: var(--secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
}

footer a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -2px;
    left: 0;
    background-color: var(--primary);
    transition: width 0.3s ease;
}

footer a:hover {
    color: var(--primary);
}

footer a:hover::after {
    width: 100%;
}

/* Responsywność */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .calculator-card {
        padding: 20px;
    }
    
    .price-buttons {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    
    nav {
        flex-direction: column;
        gap: 10px;
        padding: 10px;
    }
    
    .back-button {
        width: 100%;
        justify-content: center;
    }
}

select {
    background-color: rgba(10, 14, 23, 0.9);
    color: var(--light);
    border: 1px solid rgba(0, 170, 255, 0.3);
    padding: 12px 15px;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

select:hover {
    background-color: rgba(10, 14, 23, 1);
    box-shadow: 0 0 10px rgba(0, 170, 255, 0.2);
}

select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0, 170, 255, 0.2),
                0 0 15px rgba(0, 170, 255, 0.1);
}

/* Dodatkowe efekty */
.glow-on-hover {
    transition: box-shadow 0.3s ease;
}

.glow-on-hover:hover {
    box-shadow: 0 0 15px rgba(0, 170, 255, 0.4);
}
/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: rgba(10, 14, 23, 0.7);
    border-radius: 10px;
    backdrop-filter: blur(5px);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    border: 3px solid rgba(10, 14, 23, 0.7);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    box-shadow: 0 0 10px rgba(0, 170, 255, 0.3);
}

/* For Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) rgba(10, 14, 23, 0.7);
}