:root {
    --bg-color: #0f172a; /* Ciemne tło */
    --card-color: rgba(30, 41, 59, 0.9); /* Tło karty z przezroczystością */
    --accent-color: #00e0ff;
    --text-color: #f1f5f9;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.5);

    --color-green: #10b981;
    --color-yellow: #f59e0b;
    --color-red: #ef4444;
}

/* Reset i podstawowe style (Mobile-First) */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Karta Kalkulatora (UI/UX) */
.calculator-card {
    width: 100%;
    max-width: 560px;
    padding: 30px;
    background: var(--card-color);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px var(--shadow-color);
    
    /* Efekt 'blur' */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px); 
}

/* --- Sekcja Menu i Tytułu --- */
.header-with-menu {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.calculator-card__title {
    margin-bottom: 0;
    flex-grow: 1;
    text-align: left;
    color: var(--accent-color);
    font-size: 1.8rem;
    font-weight: 700;
}

/* Hamburger Menu */
.hamburger-menu {
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    color: var(--accent-color);
    width: 40px;
    height: 40px;
    margin-right: -10px; 
    transition: transform 0.3s;
    flex-shrink: 0;
}

.hamburger-menu svg {
    width: 100%;
    height: 100%;
}

.hamburger-menu:hover {
    transform: scale(1.1);
}

/* Settings Menu Overlay */
.settings-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(5px);
    z-index: 1000;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s, visibility 0.3s;
}

.settings-menu.is-open {
    visibility: visible;
    opacity: 1;
}

.settings-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 80%;
    max-width: 300px;
    height: 100%;
    background-color: var(--card-color);
    padding: 30px;
    box-shadow: -5px 0 15px var(--shadow-color);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}

.settings-menu.is-open .settings-content {
    transform: translateX(0);
}

.close-menu-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 2rem;
    color: var(--text-color);
    background: none;
    border: none;
    cursor: pointer;
    line-height: 1;
    z-index: 1001;
}

.menu-title {
    color: var(--accent-color);
    margin-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.menu-description {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-bottom: 20px;
}

.fuel-selection-group label {
    display: block;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 8px;
    background-color: #1e293b;
    cursor: pointer;
    transition: background-color 0.2s;
}

.fuel-selection-group label:hover {
    background-color: #334155;
}

.fuel-selection-group input[type="radio"] {
    margin-right: 10px;
    accent-color: var(--accent-color);
}

/* --- Inputy i Kontrolki --- */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--accent-color);
    font-size: 0.9rem;
}

/* Ukrycie systemowych przycisków spin */
.input-group input[type="number"]::-webkit-inner-spin-button,
.input-group input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.input-group input[type="number"] {
    -moz-appearance: textfield; /* Firefox */
    padding-right: 15px;
}

.input-with-controls {
    display: flex;
    align-items: center;
    position: relative;
}

.input-with-controls input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #1e293b;
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
    /* Zrobienie miejsca na własne przyciski */
    padding-right: 70px; 
}

.input-with-controls input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 224, 255, 0.3);
}
#customPricePB95,
#customPriceON,
#customPriceLPG {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #1e293b;
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#customPricePB95:focus,
#customPriceON:focus,
#customPriceLPG:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 224, 255, 0.3);
}

.control-btn {
    position: absolute;
    right: 0;
    width: 35px;
    height: 100%;
    top: 0;
    background-color: var(--accent-color);
    color: var(--bg-color); 
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: 700;
    transition: background-color 0.2s, opacity 0.2s;
    line-height: 1;
}

.control-btn.minus {
    right: 35px;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.control-btn.plus {
    right: 0;
    border-top-right-radius: 8px;
    border-bottom-right-radius: 8px;
}

.control-btn:hover {
    background-color: #00b3cc;
}

.control-btn:active {
    opacity: 0.8;
}

/* --- Wyniki (3 Kolumny na Dużym Ekranie) --- */
.result {
    display: flex; 
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--border-color);
}

.result-box {
    flex: 1; /* Równy podział na 3 kolumny */
    text-align: center;
    background-color: #1e293b;
    padding: 15px;
    border-radius: 12px;
}

.result-label {
    display: block;
    font-size: 0.8rem;
    color: #94a3b8;
    margin-bottom: 5px;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1.2;
}

/* --- Wizualizacja CO2 --- */
.co2-visualization {
    margin-bottom: 30px;
}

.co2-visualization__label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
}

.progress-bar-container {
    height: 15px;
    background-color: #334155;
    border-radius: 7px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-bar {
    height: 100%;
    width: 0;
    background-color: var(--color-green);
    /* Animacja paska */
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.5s;
}

.progress-bar--green { background-color: var(--color-green); }
.progress-bar--yellow { background-color: var(--color-yellow); }
.progress-bar--red { background-color: var(--color-red); }

.tree-estimate {
    text-align: center;
    font-size: 1rem;
    color: var(--color-green);
    font-weight: 500;
}

.tree-estimate svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
    vertical-align: middle;
    margin-right: 5px;
}

/* --- Porównanie Paliw --- */
.compare {
    padding-top: 20px;
    border-top: 1px dashed var(--border-color);
}

.compare__title {
    font-size: 1.3rem;
    margin-bottom: 20px;
    text-align: center;
}

.fuel-options {
    display: flex;
    justify-content: space-around;
    gap: 15px;
}

.fuel-option {
    flex: 1;
    text-align: center;
    padding: 15px 10px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background-color: #1e293b;
    transition: transform 0.3s;
}

.fuel-option:hover {
    transform: translateY(-3px);
}

.fuel-label {
    display: block;
    font-size: 0.8rem;
    color: #94a3b8;
    margin-bottom: 5px;
}

.fuel-cost {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    display: block;
}

/* Koszt za litr (mniejsza czcionka) */
.fuel-price-per-liter {
    display: block;
    margin-top: 5px;
    font-size: 0.9rem;
    font-weight: 400;
    color: #94a3b8;
}

.fuel-pb95 .fuel-cost { color: var(--color-red); }
.fuel-on .fuel-cost { color: var(--color-yellow); }
.fuel-lpg .fuel-cost { color: var(--color-green); }

/* --- Subtelne źródło cen --- */
.price-source {
    text-align: center;
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px dashed var(--border-color);
    font-size: 0.75rem;
    color: #64748b;
    line-height: 1.5;
}

/* Błąd API (szary) */
.price-source--error {
    color: #94a3b8;
    border-left-color: #94a3b8; 
}

.price-source--success {
    color: var(--accent-color);
}

/* --- Responsywność dla mniejszych ekranów --- */
@media (max-width: 480px) {
    .calculator-card {
        padding: 20px 15px;
    }

    .calculator-card__title {
        font-size: 1.5rem;
    }
    
    .header-with-menu {
        margin-bottom: 20px;
    }

    .result {
        flex-direction: column; /* UKŁAD PIONOWY NA MOBILNYM */
        gap: 10px;
    }

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

    .compare__title {
        font-size: 1.1rem;
    }

    .fuel-options {
        flex-direction: column;
    }
    
    .fuel-option {
        width: 100%;
    }
}
/* --- Floating Action Button (FAB) dla Udostępniania --- */
.calculator-card {
    position: relative; /* Ważne dla pozycjonowania FAB */
}
.fab-share-btn {
    position: absolute; 
    bottom: 25px; 
    right: 25px;  
    width: 50px;
    height: 50px;
    border-radius: 50%;
    /* ZMIANA: Usuwamy tło i cień */
    background-color: transparent; 
    border: 1px solid var(--border-color); /* Dodajemy subtelną ramkę */
    box-shadow: none; 
    
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
    z-index: 900; 
}

.fab-share-btn svg {
    width: 24px;
    height: 24px;
    /* ZMIANA: Zmieniamy kolor ikony na akcent lub tekst */
    stroke: var(--accent-color); 
    color: var(--accent-color); /* Dla przeglądarek, które używają `color` dla stroke */
}

.fab-share-btn:hover {
    /* ZMIANA: Przy najechaniu subtelne tło i lekki cień */
    background-color: rgba(0, 224, 255, 0.1); 
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.fab-share-btn:active {
    transform: translateY(0);
    box-shadow: none;
    background-color: rgba(0, 224, 255, 0.2);
}

.fab-share-message {
    position: absolute;
    bottom: 40px; /* Obok przycisku, ale trochę wyżej */
    right: 90px; /* Po lewej od przycisku */
    background-color: rgba(30, 41, 59, 0.95); /* Tło dla komunikatu */
    color: var(--color-green);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    white-space: nowrap; /* Zapobiega zawijaniu tekstu */
    pointer-events: none; /* Nie blokuje kliknięć pod spodem */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 901;
}

.fab-share-message.show {
    opacity: 1;
    visibility: visible;
}

/* Responsywność dla FAB na małych ekranach */
@media (max-width: 480px) {
    .fab-share-btn {
        bottom: 15px; /* Mniejsza odległość od dołu */
        right: 15px; /* Mniejsza odległość od prawej */
        width: 45px; /* Nieco mniejszy przycisk */
        height: 45px;
    }
    .fab-share-btn svg {
        width: 20px;
        height: 20px;
    }
    .fab-share-message {
        bottom: 30px;
        right: 70px;
        font-size: 0.75rem;
        padding: 6px 10px;
    }
}