/* --- Root Variables for Theming --- */
:root {
    /* Light Theme (Base) */
    --bg-color: #f0f0f0;
    --fg-color: #333333;
    --entry-bg: #ffffff;
    --button-bg: #cccccc;
    --accent-color: #3498db; /* Blue for Light Theme */
    --error-color: #e74c3c;
    --warning-color: #f39c12;
    --info-color: #3498db;
    --success-color: #27ae60; /* NEW: Success color */
    --select-bg: #a0a0a0;
    --container-bg: #ffffff;
    --border-color: #ccc;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* --- Dark Theme Variables --- */
body.dark-mode {
    --bg-color: #1e1e1e;
    --fg-color: #ffffff;
    --entry-bg: #3c3c3c;
    --button-bg: #505050;
    --accent-color: #2ecc71; /* Green for Dark Theme */
    --error-color: #c0392b;
    --warning-color: #f1c40f;
    --info-color: #2ecc71;
    --success-color: #2ecc71; /* NEW: Success color for dark mode */
    --select-bg: #5a5a5a;
    --container-bg: #2d2d30;
    --border-color: #444;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

/* --- Global Reset and Setup (FIX 1: Box Sizing) --- */
*,
*::before,
*::after {
    box-sizing: border-box; /* Ensures padding/border is included in the width, preventing overflow */
}

/* --- HTML/Body Fixes for Full Background Coverage (FIXED) --- */
html, body {
    width: 100%;
    height: 100%; /* For older browsers */
    min-height: 100vh; 
    min-height: 100dvh; /* FIX 2: Dynamic Viewport Height for Mobile */
    margin: 0;
    padding: 0;
    overflow-x: hidden; /* FIX 3: Prevents horizontal scroll/overflow */
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--fg-color);
    padding: 0; 
    /* LAYOUT FIX: Removed flex properties to ensure block elements stack and center correctly */
    transition: background-color 0.3s, color 0.3s;
}

.container {
    position: relative;
    width: 100%;
    max-width: 900px;
    background-color: var(--container-bg);
    padding: 20px;
    /* LAYOUT FIX: Used auto margins for horizontal centering and space from top/footer */
    margin: 20px auto 10px auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

/* Updated H1/Subtitle Styling */
h1 {
    color: var(--accent-color);
    text-align: center;
    margin-top: 0;
    padding-bottom: 5px; 
}

.subtitle {
    text-align: center; 
    font-size: 1.1em;
    font-weight: normal;
    margin-top: 0;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
    color: var(--fg-color);
    transition: color 0.3s, border-color 0.3s;
}

/* --- Header Controls (Dark Mode/Info Buttons) --- */
.header-controls {
    display: flex;
    justify-content: center; 
    gap: 10px;
    margin-bottom: 20px;
}

.control-button {
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.9em;
    background-color: var(--button-bg);
    color: var(--fg-color);
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.control-button:hover {
    background-color: var(--select-bg);
}

/* --- Input Grid --- */
.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px 30px;
    margin-bottom: 20px;
}

.input-grid label {
    font-weight: bold;
    align-self: center;
    text-align: right;
    padding-right: 10px;
}

.input-grid input[type="number"],
.input-grid input[type="text"] {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box; /* Inherited from global *, but good practice */
    font-size: 1em;
    background-color: var(--entry-bg);
    color: var(--fg-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

/* Theming for Number Input Spinners */
.input-grid input[type="number"]::-webkit-inner-spin-button,
.input-grid input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0; 
    width: 25px; 
    height: 100%;
    background-color: var(--button-bg);
    color: var(--fg-color);
    cursor: pointer;
    opacity: 1; 
    border-left: 1px solid var(--border-color); 
    transition: background-color 0.2s, color 0.2s;
}

.input-grid input[type="number"]::-webkit-inner-spin-button {
    height: 50%; 
    padding: 0;
}
.input-grid input[type="number"]::-webkit-outer-spin-button {
    height: 50%; 
    padding: 0;
}


/* --- Options Bar --- */
.options-bar {
    display: flex;
    justify-content: flex-start;
    gap: 30px;
    margin-bottom: 20px;
    padding: 10px 0;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 8px;
}

.options-bar label {
    font-size: 0.9em;
    cursor: pointer;
}

/* --- Action Button Bar --- */
.button-bar {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 20px;
}

.button-bar button {
    padding: 12px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.9em;
    flex-grow: 1;
    background-color: var(--button-bg);
    color: var(--fg-color);
    transition: background-color 0.2s, color 0.2s;
}

#btn-create {
    background-color: var(--accent-color);
    color: white;
}
#btn-create:hover:not(:disabled) {
    background-color: color-mix(in srgb, var(--accent-color) 80%, black);
}

#btn-clear, #btn-evaluate, #btn-copy-selected, #btn-copy-all {
    background-color: var(--button-bg);
    color: var(--fg-color);
}
#btn-clear:hover:not(:disabled),
#btn-evaluate:hover:not(:disabled), 
#btn-copy-selected:hover:not(:disabled),
#btn-copy-all:hover:not(:disabled) {
    background-color: var(--select-bg);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* --- Output Area --- */
.output-area label {
    font-weight: bold;
    display: block;
    margin-bottom: 5px;
}

#passwords-select {
    width: 100%;
    min-height: 200px;
    font-family: "Consolas", monospace;
    font-size: 1.1em;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--entry-bg);
    color: var(--fg-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

#passwords-select option:checked {
    background-color: var(--select-bg);
    color: var(--fg-color);
}

/* --- Message Area --- */
.message-area {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    min-height: 80px;
    z-index: 1100;
    border-radius: 8px;
    font-weight: bold;
    text-align: left;
    padding: 10px 15px;
    line-height: 1.6;
    border: 1px solid transparent;
    white-space: pre-wrap;
    word-wrap: break-word;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s, visibility 0.3s;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
}

.message-area.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Message Colors (Light Mode) */
.message-area.error { 
    background-color: color-mix(in srgb, var(--error-color) 10%, white); 
    color: var(--error-color); 
    border-color: var(--error-color);
}
.message-area.warning { 
    background-color: color-mix(in srgb, var(--warning-color) 10%, white); 
    color: var(--warning-color); 
    border-color: var(--warning-color);
}
.message-area.info { 
    background-color: color-mix(in srgb, var(--info-color) 10%, white); 
    color: var(--info-color); 
    border-color: var(--info-color);
}
.message-area.success { 
    background-color: color-mix(in srgb, var(--success-color) 10%, white); 
    color: var(--success-color); 
    border-color: var(--success-color);
}

/* Evaluation message types (same colors but semantic naming) */
.message-area.evaluation-error { 
    background-color: color-mix(in srgb, var(--error-color) 10%, white); 
    color: var(--error-color); 
    border-color: var(--error-color);
}
.message-area.evaluation-warning { 
    background-color: color-mix(in srgb, var(--warning-color) 10%, white); 
    color: var(--warning-color); 
    border-color: var(--warning-color);
}
.message-area.evaluation-info { 
    background-color: color-mix(in srgb, var(--info-color) 10%, white); 
    color: var(--info-color); 
    border-color: var(--info-color);
}
.message-area.evaluation-success { 
    background-color: color-mix(in srgb, var(--success-color) 10%, white); 
    color: var(--success-color); 
    border-color: var(--success-color);
}

/* Message Colors (Dark Mode) */
body.dark-mode .message-area.error { 
    background-color: color-mix(in srgb, var(--error-color) 20%, black); 
    color: var(--error-color); 
    border-color: var(--error-color);
}
body.dark-mode .message-area.warning { 
    background-color: color-mix(in srgb, var(--warning-color) 20%, black); 
    color: var(--warning-color); 
    border-color: var(--warning-color);
}
body.dark-mode .message-area.info { 
    background-color: color-mix(in srgb, var(--info-color) 20%, black); 
    color: var(--info-color); 
    border-color: var(--info-color);
}
body.dark-mode .message-area.success { 
    background-color: color-mix(in srgb, var(--success-color) 20%, black); 
    color: var(--success-color); 
    border-color: var(--success-color);
}

/* Evaluation message types for dark mode */
body.dark-mode .message-area.evaluation-error { 
    background-color: color-mix(in srgb, var(--error-color) 20%, black); 
    color: var(--error-color); 
    border-color: var(--error-color);
}
body.dark-mode .message-area.evaluation-warning { 
    background-color: color-mix(in srgb, var(--warning-color) 20%, black); 
    color: var(--warning-color); 
    border-color: var(--warning-color);
}
body.dark-mode .message-area.evaluation-info { 
    background-color: color-mix(in srgb, var(--info-color) 20%, black); 
    color: var(--info-color); 
    border-color: var(--info-color);
}
body.dark-mode .message-area.evaluation-success { 
    background-color: color-mix(in srgb, var(--success-color) 20%, black); 
    color: var(--success-color); 
    border-color: var(--success-color);
}

/* --- Modal Styles (For Info Popup) --- */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal.hidden { display: none; }

.modal-content {
    background-color: var(--container-bg);
    color: var(--fg-color);
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 700px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    position: relative;
    transition: background-color 0.3s, color 0.3s;
}

.modal-content h2 {
    color: var(--accent-color);
    margin-top: 0;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
    font-size: 1.5em;
}

/* NEW: Info modal content styling for better readability */
.modal-content h3 {
    color: var(--accent-color);
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 1.2em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.modal-content h3:first-of-type {
    margin-top: 10px;
}

.info-section {
    margin-bottom: 12px;
    padding: 10px 12px;
    background-color: var(--entry-bg);
    border-radius: 6px;
    border-left: 4px solid var(--accent-color);
}

.info-section strong {
    display: block;
    color: var(--accent-color);
    font-size: 1em;
    margin-bottom: 4px;
}

.info-section p {
    margin: 0;
    line-height: 1.5;
    color: var(--fg-color);
}

.info-list {
    margin: 0;
    padding-left: 20px;
    line-height: 1.8;
}

.info-list li {
    margin-bottom: 5px;
}

#info-text {
    padding: 10px 0;
    font-size: 0.95em;
    line-height: 1.6;
}

.close-button {
    color: var(--fg-color);
    float: right;
    font-size: 28px;
    font-weight: bold;
    position: absolute;
    top: 10px;
    right: 20px;
}

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

.modal-close-button {
    margin-top: 15px;
    padding: 10px 20px;
    background-color: var(--button-bg);
    color: var(--fg-color);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    float: right;
}
.modal-close-button:hover {
    background-color: var(--select-bg);
}

/* --- Footer Styles --- */
footer {
    width: 100%;
    max-width: 900px; /* Match the max-width of the container */
    text-align: center;
    padding: 0 20px; 
    /* LAYOUT FIX: Used auto margins for horizontal centering and correct spacing */
    margin: 5px auto 20px auto; 
    font-size: 1.1em; /* INCREASED FONT SIZE */
    color: var(--fg-color);
    transition: color 0.3s;
}

footer p {
    margin: 0;
    padding: 0;
}

footer a {
    color: var(--accent-color); /* Uses the themed accent color (Blue/Green) */
    text-decoration: none;
    font-weight: 700; /* Made link slightly bolder */
    transition: color 0.3s;
}

footer a:hover {
    text-decoration: underline;
    /* Themed Hover: Darkens the accent color slightly for feedback in both light and dark mode */
    color: color-mix(in srgb, var(--accent-color) 80%, black);
}


/* ======================================= */
/* !!! CRITICAL MOBILE MEDIA QUERY FIXES !!! */
/* ======================================= */

@media (max-width: 768px) {
    
    /* 1. INPUT GRID STACKING */
    .input-grid {
        grid-template-columns: 1fr; /* Single column layout */
        gap: 10px; 
    }

    /* 2. INPUT LABEL ALIGNMENT */
    .input-grid label {
        text-align: left; /* Labels align left, stacked on top of inputs */
        padding-right: 0;
    }

    /* 3. BUTTON BAR STACKING */
    .button-bar {
        flex-direction: column; /* Buttons stack vertically */
        gap: 10px;
    }

    /* 4. OPTIONS BAR STACKING */
    .options-bar {
        flex-direction: column; /* Checkboxes stack vertically */
        gap: 10px;
    }
    
    /* 5. HEADER CONTROLS WRAP */
     .header-controls {
        flex-wrap: wrap; 
        gap: 10px;
    }

    /* 6. Ensure container padding is appropriate (FIXED) */
    .container {
        padding: 15px;
        margin: 15px 10px 10px 10px; /* Adjusted margin for mobile */
    }
    
    /* 7. Modal adjustments for mobile */
    .modal-content {
        padding: 20px;
        max-height: 90vh;
    }
    
    .info-section {
        padding: 10px 12px;
    }
    
    /* 8. Footer adjustment for mobile */
    footer {
        max-width: 100%; /* Allow footer to span full width (minus body margin) */
        padding: 0 15px;
        margin: 5px auto 20px auto;
    }
}