* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: #f1f5f9;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 16px;
}

.remote-card {
    width: 100%;
    max-width: 360px;
    background: #ffffff;
    border-radius: 28px;
    padding: 32px 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    text-align: center;
}

/* Vùng Logo */
.logo-container {
    margin-bottom: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo-img {
    width: 85px;
    height: auto;
    object-fit: contain;
}

.brand-title {
    font-size: 16px;
    font-weight: 800;
    color: #005a9c;
    letter-spacing: 1px;
    margin-bottom: 24px;
    text-transform: uppercase;
}

/* Lưới nút bấm (Grid 2x2) */
.btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 12px;
}

.btn {
    border: none;
    border-radius: 18px;
    padding: 20px 12px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.15s ease-in-out;
}

.btn:active {
    transform: scale(0.95);
}

.btn .icon {
    font-size: 24px;
}

/* Định dạng màu sắc từng nút */
.btn-phoi {
    background: #005a9c;
    color: #ffffff;
}

.btn-thu {
    background: #fef2f2;
    color: #ef4444;
    border: 1px solid #fca5a5;
}

.btn-auto {
    background: #f8fafc;
    color: #334155;
    border: 1px solid #e2e8f0;
}

.btn-home {
    background: #f8fafc;
    color: #334155;
    border: 1px solid #e2e8f0;
}

/* Nút STOP full width phía dưới */
.btn-stop {
    width: 100%;
    background: #0f172a;
    color: #ffffff;
    padding: 16px;
    flex-direction: row;
    border-radius: 16px;
}

.btn-stop:hover {
    background: #1e293b;
}