/* ===== Google Fonts & Basic Setup ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');

:root {
    --primary-color: #000000;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #212529;
    --border-color: #dee2e6;
    --accent-color: #4CAF50; /* Green from the logo */
    --danger-color: #dc3545; /* Red color for reset/clear */
    --danger-hover-color: #c82333;
    --shadow: 0 4px 8px rgba(0,0,0,0.05);
}

[data-theme="dark"] {
    --primary-color: #ffffff;
    --secondary-color: #a9b1ba;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333;
    --accent-color: #66bb6a;
    --danger-color: #e57373;
    --danger-hover-color: #ef5350;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 1.5rem;
    transition: background-color 0.3s, color 0.3s;
}

/* ===== Header & Logo ===== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}
.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.logo-img {
    width: 50px;
    height: 50px;
    border-radius: 8px;
}
h1, h2, h3 { color: var(--primary-color); }
h1 { font-size: 1.8rem; margin: 0; }

/* ===== Main Layout ===== */
.main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
@media (min-width: 992px) {
    .main-grid { grid-template-columns: 400px 1fr; }
}

/* ===== Containers & Cards ===== */
.controls-container, .output-container {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: background-color 0.3s;
}

/* ===== Form Elements ===== */
.form-group { margin-bottom: 1.5rem; }
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--secondary-color);
}
textarea, input[type="range"] {
    width: 100%;
    padding: 0.75rem;
    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;
}
textarea { min-height: 100px; resize: vertical; }

.color-pickers { display: flex; gap: 1rem; }
.color-pickers > div { flex: 1; }
input[type="color"] {
    width: 100%;
    height: 40px;
    border: none;
    padding: 0;
    border-radius: 8px;
    cursor: pointer;
    background-color: transparent;
}
input[type="file"] {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* ===== Buttons ===== */
button {
    padding: 0.8rem 1.2rem;
    border: none;
    border-radius: 8px;
    background-color: var(--secondary-color);
    color: white;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s, background-color 0.2s;
}
button:hover { opacity: 0.85; transform: translateY(-2px); }
.button-group { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.primary {
    background-color: var(--accent-color);
    flex-grow: 1;
}

.secondary { background-color: var(--secondary-color); }
.small { font-size: 0.8rem; padding: 0.4rem 0.8rem; }

/* New danger button style 🚨 */
.danger-btn {
    background-color: var(--danger-color);
}
.danger-btn:hover {
    background-color: var(--danger-hover-color);
    opacity: 1; /* Override default hover opacity */
}

/* ===== QR Code & History ===== */
.qr-code-preview { text-align: center; }
#qr-canvas {
    margin: 1rem auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    background-color: var(--background-color);
    display: inline-block;
}
.history-section { margin-top: 2rem; }
.history-section h3 {
    display: inline-block;
    margin-right: 1rem;
}
#history-list {
    margin-top: 1rem;
    max-height: 200px;
    overflow-y: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}
.history-item {
    background-color: var(--background-color);
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background-color 0.2s;
}
.history-item:hover { background-color: var(--accent-color); color: white; }

/* ===== Theme Toggle Switch ===== */
.theme-switcher { display: flex; align-items: center; gap: 0.5rem; }
.toggle-checkbox { display: none; }
.toggle-label {
    width: 50px;
    height: 26px;
    background-color: var(--secondary-color);
    border-radius: 13px;
    position: relative;
    cursor: pointer;
    transition: background-color 0.3s;
}
.toggle-label::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background-color: white;
    top: 2px;
    left: 2px;
    transition: transform 0.3s;
}
.toggle-checkbox:checked + .toggle-label { background-color: var(--accent-color); }
.toggle-checkbox:checked + .toggle-label::after { transform: translateX(24px); }