/* Definicje trybów */
:root { 
    --main-color: #f1c40f; 
    --dark-bg: #1a1a1a; 
    --card-bg: #222222;
    --text-main: #ffffff;
    --input-border: #333333;
}

/* Nadpisanie kolorów dla trybu jasnego */
[data-theme="light"] {
    --dark-bg: #e0e0e0;
    --card-bg: #ffffff;
    --text-main: #1a1a1a;
    --input-border: #cccccc;
}

body { 
    background: var(--dark-bg); 
    color: var(--text-main); 
    transition: background 0.3s, color 0.3s; /* Płynne przejście */
}
/* Styl dla przycisku zmiany trybu */
.theme-toggle {
    background: var(--main-color);
    color: #000;
    border: none;
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.8rem;
    margin-left: 15px;
}

body { 
    font-family: 'Segoe UI', sans-serif; 
    margin: 0; 
    background: var(--dark-bg); 
    color: var(--text-main); 
    line-height: 1.6;
}

/* --- NAWIGACJA --- */
header { 
    background: var(--dark-bg); 
    padding: 1rem 5%; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border-bottom: 3px solid var(--main-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo { font-size: 1.5rem; font-weight: bold; color: var(--main-color); text-decoration: none; }
nav a { color: white; text-decoration: none; margin-left: 15px; font-size: 0.9rem; font-weight: bold; }
nav a:hover { color: var(--main-color); }

/* --- KONTENER I KARTY --- */
.container { max-width: 850px; margin: 30px auto; padding: 0 15px; }

.card { 
    background: var(--card-bg); 
    padding: 25px; 
    border-radius: 12px; 
    box-shadow: 0 10px 30px rgba(0,0,0,0.5); 
    margin-bottom: 25px; 
    border: 1px solid var(--input-border);
}

h3 { 
    color: var(--main-color); 
    margin-top: 0; 
    border-bottom: 2px solid var(--main-color); 
    padding-bottom: 10px; 
    text-transform: uppercase;
}
h4 { 
    color: var(--main-color); 
    margin-top: 0; 
    border-bottom: 2px solid var(--main-color); 
    padding-bottom: 10px; 
    text-transform: uppercase;
    color: rgba(241, 5, 5, 0.92); 
    font-size: 0.7rem; 
}
/* --- POLA FORMULARZA (Pancerny Wygląd) --- */
input { 
    padding: 12px; 
    border: 2px solid var(--input-border); 
    border-radius: 6px; 
    width: 100%; 
    box-sizing: border-box; 
    font-size: 16px; 
    background: #2a2a2a;
    color: #fff;
    margin-top: 5px;
}
input:focus { border-color: var(--main-color); outline: none; }

/* --- KALKULATOR ELEMENTY --- */
.bill-box { 
    background: #111; 
    padding: 20px; 
    border-radius: 8px; 
    display: flex; 
    gap: 20px; 
    flex-wrap: wrap; 
    align-items: center; 
    border: 1px solid #333;
}
.bill-box div { flex: 1; min-width: 160px; font-weight: bold; color: var(--main-color); }

.device-row { 
    display: flex; 
    align-items: center; 
    margin-bottom: 12px; 
    padding: 10px; 
    background: #2a2a2a; 
    border-radius: 8px; 
    gap: 12px; 
}
.col-name { flex: 2; } 
.col-watts, .col-hours { width: 100px; } 
.col-cost { flex: 1; text-align: right; font-weight: bold; color: var(--main-color); min-width: 90px; }

/* --- PRZYCISKI --- */
button { cursor: pointer; padding: 14px 20px; border: none; border-radius: 6px; font-weight: bold; transition: 0.3s; text-transform: uppercase; }

.btn-add { background: #27ae60; color: white; width: 100%; margin-bottom: 15px; }
.btn-del { background: #c0392b; color: white; padding: 8px 12px; }
.btn-pdf { background: var(--main-color); color: #000; width: 100%; margin-top: 15px; font-size: 1.1rem; }
.btn-clear { background: transparent; color: #666; border: 1px solid #444; margin-top: 25px; width: 100%; font-size: 0.8em; }

/* --- SZYBKIE DODAWANIE GRID --- */
.preset-grid { 
    display: grid; 
    grid-template-columns: repeat(3, 1fr); 
    gap: 10px; 
    margin-top: 15px; 
}
.btn-preset { 
    background: #333; 
    color: #fff; 
    font-size: 0.8rem; 
    padding: 12px 5px; 
    border: 1px solid #444;
    text-transform: none;
}
.btn-preset:hover { background: var(--main-color); color: #000; }

.total-box { 
    margin-top: 25px; 
    padding: 20px; 
    background: #000; 
    border-radius: 10px; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border: 2px solid var(--main-color);
}

.autor { margin-top: 30px; text-align: center; font-size: 11px; color: #555; padding-bottom: 20px; }

@media (max-width: 600px) {
    header { flex-direction: column; padding: 10px; }
    .device-row { flex-wrap: wrap; }
    .col-name { width: 100%; flex: none; }
    .preset-grid { grid-template-columns: repeat(2, 1fr); }
}
/* Styl dla nagłówka listy urządzeń */
.device-header {
    display: flex;
    gap: 12px;
    padding: 0 10px;
    margin-bottom: 5px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
    color: var(--main-color);
    opacity: 0.8;
}
.header-name { flex: 2; }
.header-watts, .header-hours { width: 100px; text-align: center; }
.header-cost { flex: 1; text-align: right; margin-right: 40px; } /* 40px na odstęp od przycisku X */

@media (max-width: 600px) {
    .device-header { display: none; } /* Na telefonach ukrywamy nagłówek, bo lista się zawija */
}