/* Základní styly pro aplikaci "Výměr rychlosti" */
:root {
    --background-color: #f0f0f0;
    --container-background: white;
    --text-color: #000;
    --header-background: #000080;
    --header-color: white;
    --menu-background: #f0f0f0;
    --menu-border: #ccc;
    --menu-item-hover: #000080;
    --menu-item-color: #000;
    --menu-item-hover-color: white;
    --form-group-border: #ccc;
    --input-background: white;
    --input-border: #ccc;
    --input-color: #000;
    --button-background: #000080;
    --button-color: white;
    --button-hover: #000060;
    --result-background: #e0e0e0;
    --result-border: #ccc;
    --modal-background: #fefefe;
    --modal-border: #888;
    --modal-close: #aaa;
    --modal-close-hover: #000;
}

[data-theme="dark"] {
    --background-color: #1a1a1a;
    --container-background: #2d2d2d;
    --text-color: #ffffff;
    --header-background: #000080;
    --header-color: white;
    --menu-background: #3a3a3a;
    --menu-border: #555;
    --menu-item-hover: #000080;
    --menu-item-color: #ffffff;
    --menu-item-hover-color: white;
    --form-group-border: #555;
    --input-background: #3a3a3a;
    --input-border: #555;
    --input-color: #ffffff;
    --button-background: #000080;
    --button-color: white;
    --button-hover: #0000a0;
    --result-background: #3a3a3a;
    --result-border: #555;
    --modal-background: #2d2d2d;
    --modal-border: #555;
    --modal-close: #aaa;
    --modal-close-hover: #fff;
}

body {
    font-family: 'MS Sans Serif', Arial, sans-serif;
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    color: var(--text-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--container-background);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    min-height: 100vh;
}

header {
    background-color: var(--header-background);
    color: var(--header-color);
    padding: 20px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 24px;
}

main {
    padding: 0 20px 20px 20px;
}

.form-section {
    margin-bottom: 30px;
}

.form-section h2 {
    color: #000080;
    border-bottom: 1px solid #000080;
    padding-bottom: 5px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--input-border);
    background-color: var(--input-background);
    color: var(--input-color);
    box-sizing: border-box;
}

.precision-selection {
    border: 1px solid var(--form-group-border);
    padding: 15px;
    margin-bottom: 20px;
}

.precision-selection legend {
    font-weight: bold;
    padding: 0 10px;
}

.precision-selection div {
    margin: 10px 0;
}

.button-group {
    text-align: center;
    margin-top: 20px;
}

.button-group button {
    background-color: var(--button-background);
    color: var(--button-color);
    border: none;
    padding: 10px 20px;
    margin: 0 10px;
    cursor: pointer;
    font-family: 'MS Sans Serif', Arial, sans-serif;
    font-size: 14px;
}

.button-group button:hover {
    background-color: var(--button-hover);
}

.result-section {
    margin-top: 20px;
    padding: 15px;
    background-color: var(--result-background);
    border: 1px solid var(--result-border);
}

.result-section h3 {
    margin-top: 0;
}

.hidden {
    display: none;
}

/* Styly pro menu */
.menu {
    background-color: var(--menu-background);
    border: 1px solid var(--menu-border);
    margin-bottom: 20px;
}

.menu ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.menu li {
    position: relative;
}

.menu a {
    display: block;
    padding: 10px 15px;
    text-decoration: none;
    color: var(--menu-item-color);
    border-right: 1px solid var(--menu-border);
}

.menu a:hover {
    background-color: var(--menu-item-hover);
    color: var(--menu-item-hover-color);
}

/* Styly pro modální okna */
.modal {
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: var(--modal-background);
    margin: 15% auto;
    padding: 20px;
    border: 1px solid var(--modal-border);
    width: 80%;
    max-width: 500px;
    position: relative;
}

.close {
    color: var(--modal-close);
    float: right;
    font-size: 28px;
    font-weight: bold;
    position: absolute;
    right: 10px;
    top: 0;
}

.close:hover,
.close:focus {
    color: var(--modal-close-hover);
    text-decoration: none;
    cursor: pointer;
}

/* Responzivní design */
@media screen and (max-width: 600px) {
    .container {
        margin: 0;
        box-shadow: none;
    }
    
    .menu ul {
        flex-direction: column;
    }
    
    .menu a {
        border-right: none;
        border-bottom: 1px solid var(--menu-border);
    }
    
    .dropdown-content {
        position: static;
        box-shadow: none;
        display: block;
        padding-left: 20px;
    }
}

/* Styly pro tlačítko přepínání tmavého režimu */
.theme-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 1000;
}

#theme-toggle {
    background-color: var(--button-background);
    color: var(--button-color);
    border: none;
    padding: 5px 10px;
    cursor: pointer;
    font-size: 16px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
}

#theme-toggle:hover {
    background-color: var(--button-hover);
}