/* --- General Setup & Variables -- */
:root {
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --secondary-color: #6c757d;
    --secondary-hover-color: #5a6268;
    --background-color: #f0f2f5;
    --card-background-color: #ffffff;
    --text-color: #333;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --danger-color: #d9534f;
    --warning-color: #f0ad4e;
    --icon-color: #007bff;
}

body {
    font-family: 'Segoe UI', 'Malgun Gothic', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
}

/* --- Dark Mode --- */
body.dark-mode {
    --primary-color: #4da3ff;
    --primary-hover-color: #1a8cff;
    --secondary-color: #8c96a0;
    --secondary-hover-color: #a6b0b9;
    --background-color: #1a1a2e;
    --card-background-color: #2c2c44;
    --text-color: #e0e0e0;
    --border-color: #444;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --icon-color: #4da3ff;
}

/* --- Layout & Containers --- */
.container {
    max-width: 900px;
    margin: 20px auto;
    padding: 20px;
}

header {
    padding: 10px 20px;
    background-color: var(--card-background-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

/* --- General UI Components --- */
.card-section {
    background-color: var(--card-background-color);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: background-color 0.3s;
}

.section-title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.section-description {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

/* --- Form Elements --- */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

input[type="text"], input[type="email"], textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--background-color);
    color: var(--text-color);
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.3s, background-color 0.3s;
}

input[type="text"]:focus, input[type="email"]:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* --- Buttons --- */
.button-group {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.primary-button, .secondary-button, .control-button {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

.primary-button {
    background-color: var(--primary-color);
    color: #fff;
}

.primary-button:hover {
    background-color: var(--primary-hover-color);
    transform: translateY(-2px);
}

.secondary-button {
    background-color: var(--secondary-color);
    color: #fff;
}

.secondary-button:hover {
    background-color: var(--secondary-hover-color);
    transform: translateY(-2px);
}

.control-button {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

/* --- Top Controls (Dark Mode/Lang) --- */
.top-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.mode-switch {
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-switch .fas {
    color: var(--icon-color);
}

.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;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

/* --- Output Section --- */
.output-section {
    display: none; /* Hidden by default, shown via JS */
}

.warning-card {
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--background-color);
}

.warning-card.error p {
    color: var(--danger-color);
    font-weight: bold;
    text-align: center;
}

.warning-card h3, .warning-card h4 {
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    margin-top: 0;
}

.warning-card ul {
    padding-left: 20px;
    margin: 10px 0;
}

.ghs-pictogram-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin: 20px 0;
}

.ghs-pictogram {
    width: 100px;
    height: 100px;
    object-fit: contain;
}

.signal-word h4 {
    margin-bottom: 5px;
}

.signal-word p.danger {
    color: var(--danger-color);
    font-size: 1.5rem;
    font-weight: bold;
}

.signal-word p.warning {
    color: var(--warning-color);
    font-size: 1.5rem;
    font-weight: bold;
}

/* --- Responsive Design --- */
@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    .card-section {
        padding: 15px;
    }
    .button-group {
        flex-direction: column;
    }
    .top-controls {
        gap: 10px;
    }
}