/* --- THEME VARIABLES --- */
:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --heading-color: #2c3e50;
    --input-bg: #ffffff;
    --input-border: #ddd;
    --input-text: #333;
    --task-bg: #f9f9f9;
    --primary-color: #3498db;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --heading-color: #ffffff;
    --input-bg: #2d2d2d;
    --input-border: #444;
    --input-text: #e0e0e0;
    --task-bg: #2d2d2d;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; transition: background-color 0.3s, color 0.3s; }

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

/* --- MAIN CONTAINER --- */
.container {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 420px; /* Slightly wider */
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    /* No relative position needed for controls anymore */
}

h1 { text-align: center; margin-bottom: 0.5rem; color: var(--heading-color); }
h3 { text-align: center; margin-bottom: 1.5rem; opacity: 0.8; font-weight: normal; }

/* --- CONTROLS (FIXED TO TOP RIGHT OF SCREEN) --- */
.controls-wrapper {
    position: fixed; /* Stick to the window, not the card */
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 1000;
    background: rgba(0,0,0,0.05); /* Subtle background for visibility */
    padding: 8px 12px;
    border-radius: 20px;
    backdrop-filter: blur(5px); /* Nice glass effect */
}

body.dark-mode .controls-wrapper {
    background: rgba(255,255,255,0.1);
}

.lang-select {
    padding: 4px 8px;
    font-size: 14px;
    border-radius: 6px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--input-text);
    cursor: pointer;
    margin-bottom: 0; /* Override default input margin */
    width: auto;
}

/* --- FORM ELEMENTS --- */
input[type="text"], input[type="password"] {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--input-text);
    border-radius: 6px;
    font-size: 16px;
}
input:focus { border-color: var(--primary-color); outline: none; }

/* Input Group for Add Task (Side by side) */
.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}
.input-group input { margin-bottom: 0; }
.btn-add { width: auto; margin-bottom: 0; padding: 0 20px; white-space: nowrap; }

/* --- BUTTONS --- */
button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    font-weight: 600;
    margin-bottom: 10px;
}
.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover { filter: brightness(90%); }
.btn-secondary { background-color: #95a5a6; color: white; }
.btn-secondary:hover { background-color: #7f8c8d; }

.btn-delete {
    background-color: #e74c3c;
    color: white;
    width: auto;
    padding: 6px 12px;
    font-size: 13px;
    margin-bottom: 0;
}
.btn-delete:hover { background-color: #c0392b; }

/* --- TASK LIST --- */
.task-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--task-bg);
    padding: 12px 15px;
    margin-bottom: 10px;
    border-radius: 8px;
    border-left: 5px solid var(--primary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.hidden { display: none; }

/* --- TOGGLE SWITCH --- */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { display: none; }
.slider {
    position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
    background-color: #ccc; border-radius: 34px; transition: .4s;
}
.slider:before {
    position: absolute; content: ""; height: 18px; width: 18px; left: 3px; bottom: 3px;
    background-color: white; border-radius: 50%; transition: .4s;
}
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(20px); }

/* --- FOOTER --- */
.footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--input-border);
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.6;
}
.footer a { color: var(--primary-color); text-decoration: none; }

/* --- RESPONSIVE DESIGN (MOBILE) --- */
@media (max-width: 480px) {
    body {
        /* Move content down so it doesn't hit the fixed header */
        align-items: flex-start; 
        padding-top: 80px; 
    }

    .container {
        padding: 1.5rem;
        width: 100%;
    }

    /* Make controls smaller on mobile */
    .controls-wrapper {
        top: 10px;
        right: 10px;
        padding: 6px 10px;
    }
    
    .lang-select { font-size: 12px; }
    .switch { width: 36px; height: 20px; }
    .slider:before { height: 14px; width: 14px; bottom: 3px; }
    input:checked + .slider:before { transform: translateX(16px); }

    h1 { font-size: 1.8rem; }
    
    /* Stack input group if screen is VERY small */
    .input-group {
        flex-direction: column;
    }
    .btn-add {
        width: 100%;
        padding: 12px;
    }
}