:root {
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --card-border: #e9ecef;
    --text-primary: #1a1d21;
    --text-secondary: #6c757d;
    --accent: #d32f2f;
    --accent-glow: rgba(211, 47, 47, 0.15);
    --accent-secondary: #d32f2f;
    --input-bg: #ffffff;
    --input-border: #dee2e6;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: 20px;
}

.background-effects {
    display: none;
}

.container {
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    position: relative;
    z-index: 10;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--accent);
}

header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.github-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
}

.footer-credit {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer-credit a {
    color: var(--accent);
    text-decoration: none;
}

.footer-credit a:hover {
    text-decoration: underline;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    border-radius: 8px;
    transition: var(--transition);
}

.github-link:hover {
    color: var(--accent);
    background: var(--accent-glow);
}

.github-icon {
    width: 1.25rem;
    height: 1.25rem;
}

.glassmorphism {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05), 0 5px 10px rgba(0, 0, 0, 0.03);
}

.input-group {
    margin-bottom: 1.5rem;
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Font Selector Styles */
.font-selector-container {
    position: relative;
    min-width: 140px;
}

.font-select {
    width: 100%;
    padding: 6px 30px 6px 12px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--card-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    appearance: none;
    cursor: pointer;
    transition: all 0.2s ease;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236c757d' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: calc(100% - 10px) center;
}

.font-select:hover {
    border-color: var(--accent);
}

.font-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.font-select option {
    background: var(--card-bg);
    color: var(--text-primary);
    padding: 10px;
}

.input-group input[type="text"],
.input-group textarea {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.message-input-area {
    margin-bottom: 1rem;
}

.message-input-area textarea {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.message-input-area textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.2);
}

.input-group input[type="text"]:focus,
.input-group textarea:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.2);
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2394a3b8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.4-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem top 50%;
    background-size: 0.65rem auto;
}

select option {
    background-color: #ffffff;
    color: var(--text-primary);
}

/* Grids for Visual Buttons */
.animation-grid,
.effect-grid,
.transition-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 5px;
}
.animation-grid::-webkit-scrollbar,
.effect-grid::-webkit-scrollbar,
.transition-grid::-webkit-scrollbar {
    width: 6px;
}
.animation-grid::-webkit-scrollbar-thumb,
.effect-grid::-webkit-scrollbar-thumb,
.transition-grid::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 3px;
}

.visual-select-btn,
.visual-effect-btn {
    background: #ffffff;
    border: 1px solid #e9ecef;
    color: var(--text-secondary);
    padding: 12px 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    height: 100%;
}

.visual-select-btn img,
.visual-effect-btn img {
    width: 100%;
    height: auto;
    max-width: 50px;
    border-radius: 4px;
    filter: brightness(0); /* Force all icons to black */
    transition: var(--transition);
}

.visual-select-btn:hover,
.visual-effect-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.visual-select-btn.active,
.visual-effect-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.visual-select-btn.active img,
.visual-effect-btn.active img {
    filter: brightness(0); /* Keep black even when active */
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.checkbox-group label.switch {
    margin-bottom: 0;
}

.checkbox-group span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: .4s;
    border-radius: 50%;
}

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

input:checked + .slider:before {
    transform: translateX(22px);
    background-color: white;
}

.primary-btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 12px;
    background: var(--accent);
    color: white;
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 1rem;
}

.primary-btn span {
    position: relative;
    z-index: 2;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px var(--accent-glow);
}

.primary-btn:active {
    transform: translateY(0);
}

.btn-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 60%);
    opacity: 0;
    transform: scale(0.5);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
}

.primary-btn:hover .btn-glow {
    opacity: 1;
    transform: scale(1);
    animation: rotate 3s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.status-message {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.875rem;
    min-height: 20px;
}

.status-success {
    color: #4ade80;
}

.status-error {
    color: #f87171;
}

.status-info {
    color: var(--text-secondary);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    background: #f1f3f5;
    padding: 0.4rem;
    border-radius: 12px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active {
    background: #ffffff;
    color: var(--accent);
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* LED Matrix Preview */
.preview-container {
    width: 100%;
    background: #1a1a1a;
    border: 1px solid #2d2d2d;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.led-matrix {
    display: grid;
    grid-template-rows: repeat(11, 1fr);
    grid-template-columns: repeat(44, 1fr);
    gap: 2px;
    width: 100%;
    aspect-ratio: 44 / 11;
    margin: 0 auto;
}

.led-pixel {
    width: 100%;
    aspect-ratio: 1 / 1;
    background-color: #2a2a2a; /* Slightly brighter off state for better contrast on dark gray */
    border-radius: 50%;
    transition: background-color 0.05s ease, box-shadow 0.05s ease;
}

/* The red LED matching the Android App */
.led-pixel.on {
    background-color: #ff0033;
    box-shadow: 0 0 4px #ff0033, 0 0 6px #ff0033;
}

/* Icon Picker */
.icon-picker {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 10px;
    padding: 10px;
    max-height: 120px;
    overflow-y: auto;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    margin-bottom: 10px;
}

.icon-picker::-webkit-scrollbar {
    width: 6px;
}
.icon-picker::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 3px;
}

.icon-item {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    padding: 4px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s ease;
}

.icon-item:hover, .icon-item.selected {
    border-color: var(--accent);
    background: rgba(255, 42, 95, 0.1);
}

.icon-item svg {
    width: 32px;
    height: 32px;
    fill: #000;
}

.icon-item svg path {
    fill: #000 !important;
}

/* Speed Slider */
.normal-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;  
    background: var(--input-bg);
    outline: none;
    margin-top: 10px;
    border: 1px solid var(--card-border);
}

.normal-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%; 
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
}